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ECU Publications Post 2013

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Articles 1 - 30 of 190

Full-Text Articles in Engineering

Large Eddy Simulation Of Turbidity Currents In A Narrow Channel With Different Obstacle Configurations, Danial Goodarzi, Kaveh Sookhak Lari, Ehsan Khavasi, Soroush Abolfathi Dec 2020

Large Eddy Simulation Of Turbidity Currents In A Narrow Channel With Different Obstacle Configurations, Danial Goodarzi, Kaveh Sookhak Lari, Ehsan Khavasi, Soroush Abolfathi

ECU Publications Post 2013

© 2020, The Author(s). Turbidity currents are frequently observed in natural and man-made environments, with the potential of adversely impacting the performance and functionality of hydraulic structures through sedimentation and reduction in storage capacity and an increased erosion. Construction of obstacles upstream of hydraulic structures is a common method of tackling adverse effects of turbidity currents. This paper numerically investigates the impacts of obstacle’s height and geometrical shape on the settling of sediments and hydrodynamics of turbidity currents in a narrow channel. A robust numerical model based on LES method was developed and successfully validated against physical modelling measurements ...


Experimental Investigation Of The Effect Of Vitagnus Plant Extract On Enhanced Oil Recovery Process Using Interfacial Tension (Ift) Reduction And Wettability Alteration Mechanisms, Seyed Ramin Mousavi Dashtaki, Jagar A. Ali, Abbas Khaksar Manshad, Iman Nowrouzi, Amir H. Mohammadi, Alireza Keshavarz Oct 2020

Experimental Investigation Of The Effect Of Vitagnus Plant Extract On Enhanced Oil Recovery Process Using Interfacial Tension (Ift) Reduction And Wettability Alteration Mechanisms, Seyed Ramin Mousavi Dashtaki, Jagar A. Ali, Abbas Khaksar Manshad, Iman Nowrouzi, Amir H. Mohammadi, Alireza Keshavarz

ECU Publications Post 2013

© 2020, The Author(s). Surfactant flooding is a chemical enhanced oil recovery (cEOR) process wherein anionic, cationic, non-ionic, and amphoteric surfactants are injected into oil reservoirs to produce more hydrocarbon. These chemical and industrial agents might cause some economic and environmental challenges. Recently, injection of natural surfactants, as new environmentally friendly EOR agents, for improving oil recovery has been proposed by researchers. In this study, the extract of Vitagnus, a natural surfactant, was used to minimize the interfacial tension (IFT) and alter the rock wettability towards the strong water-wet system, thereby improving the oil recovery from the carbonate rock The ...


High Mb Solution Degradation Efficiency Of Fesibzr Amorphous Ribbon With Surface Tunnels, Qi Chen, Zhicheng Yan, Hao Zhang, Lai-Chang Zhang, Haijian Ma, Wenlong Wang, Weimin Wang Sep 2020

High Mb Solution Degradation Efficiency Of Fesibzr Amorphous Ribbon With Surface Tunnels, Qi Chen, Zhicheng Yan, Hao Zhang, Lai-Chang Zhang, Haijian Ma, Wenlong Wang, Weimin Wang

ECU Publications Post 2013

© 2020 by the authors. The as spun amorphous (Fe78Si9B13)99.5Zr0.5 (Zr0.5) and (Fe78Si9B13)99Zr1 (Zr1) ribbons having a Fenton-like reaction are proved to bear a good degradation performance in organic dye wastewater treatment for the first time by evaluating their degradation efficiency in methylene blue (MB) solution. Compared to the widely studied (Fe78Si9B13)100Zr0 (Zr0) amorphous ribbon for degradation, with increasing cZr (Zr atomic content), the as-spun Zr0, Zr0.5 and Zr1 amorphous ribbons have gradually increased degradation rate of MB solution. According to δc (characteristic distance) of as-spun Zr0, Zr0.5 and Zr1 ribbons, the free ...


Atomically Thin Heavy-Metal-Free Znte Nanoplatelets Formed From Magic-Size Nanoclusters, Fei Wang, Minyi Zhang, Wei Chen, Shaghraf Javaid, Heng Yang, Sheng Wang, Xuyong Yang, Lai-Chang Zhang, Mark A. Buntine, Chunsen Li, Guohua Jia Aug 2020

Atomically Thin Heavy-Metal-Free Znte Nanoplatelets Formed From Magic-Size Nanoclusters, Fei Wang, Minyi Zhang, Wei Chen, Shaghraf Javaid, Heng Yang, Sheng Wang, Xuyong Yang, Lai-Chang Zhang, Mark A. Buntine, Chunsen Li, Guohua Jia

ECU Publications Post 2013

© The Royal Society of Chemistry. Atomically thin colloidal quasi-two-dimensional (2D) semiconductor nanoplatelets (NPLs) have attracted tremendous attention due to their excellent properties and stimulating applications. Although some advances have been achieved in Cd- and Pb-based semiconductor NPLs, research into heavy-metal-free NPLs has been reported less due to the difficulties in the synthesis and the knowledge gap in the understanding of the growth mechanism. Herein wurtzite ZnTe NPLs with an atomic thickness of about 1.5 nm have been successfully synthesized by using Superhydride (LiEt3BH) reduced tributylphosphine-Te (TBP-Te) as the tellurium precursor. Mechanistic studies, both experimentally and theoretically, elucidate the transformation ...


Hybrid Nanocellulose-Copper (Ii) Oxide As Engine Oil Additives For Tribological Behavior Improvement, Sakinah Hisham, Kumaran Kadirgama, Hussein A. Mohammed, Amit Kumar, Devarajan Ramasamy, Mahendran Samykano, Saidur Rahman Jul 2020

Hybrid Nanocellulose-Copper (Ii) Oxide As Engine Oil Additives For Tribological Behavior Improvement, Sakinah Hisham, Kumaran Kadirgama, Hussein A. Mohammed, Amit Kumar, Devarajan Ramasamy, Mahendran Samykano, Saidur Rahman

ECU Publications Post 2013

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Friction and wear are the main factors in the failure of the piston in automobile engines. The objective of this work was to improve the tribological behaviour and lubricant properties using hybrid Cellulose Nanocrystal (CNC) and Copper (II) oxide nanoparticles blended with SAE 40 as a base fluid. The two-step method was used in the hybrid nanofluid preparation. Three different concentrations were prepared in ...


Nanomaterial-Based Drilling Fluids For Exploitation Of Unconventional Reservoirs: A Review, Muhammad Ali, Husna Hayati Jarni, Adnan Aftab, Abdul Razak Ismail, Noori M.Cata Saady, Muhammad Faraz Sahito, Alireza Keshavarz, Stefan Iglauer, Mohammad Sarmadivaleh Jul 2020

Nanomaterial-Based Drilling Fluids For Exploitation Of Unconventional Reservoirs: A Review, Muhammad Ali, Husna Hayati Jarni, Adnan Aftab, Abdul Razak Ismail, Noori M.Cata Saady, Muhammad Faraz Sahito, Alireza Keshavarz, Stefan Iglauer, Mohammad Sarmadivaleh

ECU Publications Post 2013

© 2020 by the authors. The world's energy demand is steadily increasing where it has now become difficult for conventional hydrocarbon reservoir to meet levels of demand. Therefore, oil and gas companies are seeking novel ways to exploit and unlock the potential of unconventional resources. These resources include tight gas reservoirs, tight sandstone oil, oil and gas shales reservoirs, and high pressure high temperature (HPHT) wells. Drilling of HPHT wells and shale reservoirs has become more widespread in the global petroleum and natural gas industry. There is a current need to extend robust techniques beyond costly drilling and completion jobs ...


Quantitative Prediction Of Fractures In Shale Using The Lithology Combination Index, Zhengchen Zhang, Pingping Li, Yujie Yuan, Kouqi Liu, Jingyu Hao, Huayao Zou Jun 2020

Quantitative Prediction Of Fractures In Shale Using The Lithology Combination Index, Zhengchen Zhang, Pingping Li, Yujie Yuan, Kouqi Liu, Jingyu Hao, Huayao Zou

ECU Publications Post 2013

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Fractures, which are related to tectonic activity and lithology, have a significant impact on the storage and production of oil and gas in shales. To analyze the impact of lithological factors on fracture development in shales, we selected the shale formation from the Da’anzhai member of the lower Jurassic shales in a weak tectonic deformation zone in the Sichuan Basin. We defined a lithology combination index (LCI), that is, an attribute quantity value of some length artificially defined by exploring the lithology combination. LCI contains information on shale content at a ...


Thermal Performance Of Hybrid-Inspired Coolant For Radiator Application, F. Benedict, Amit Kumar, K. Kadirgama, Hussein A. Mohammed, D. Ramasamy, M. Samykano, R. Saidur Jun 2020

Thermal Performance Of Hybrid-Inspired Coolant For Radiator Application, F. Benedict, Amit Kumar, K. Kadirgama, Hussein A. Mohammed, D. Ramasamy, M. Samykano, R. Saidur

ECU Publications Post 2013

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Due to the increasing demand in industrial application, nanofluids have attracted the considerable attention of researchers in recent decades. The addition of nanocellulose (CNC) with water (W) and ethylene glycol (EG) to a coolant for a radiator application exhibits beneficial properties to improve the efficiency of the radiator. The focus of the present work was to investigate the performance of mono or hybrid metal oxide such as Al2O3 and TiO2 with or without plant base-extracted CNC with varying concentrations as a better heat transfer nanofluid in comparison to distilled water as a ...


An Experimental Study On Micro-Structural And Geotechnical Characteristics Of Expansive Clay Mixed With Eps Granules, Nitin Tiwari, Neelima Satyam, Sanjay Kumar Shukla Jun 2020

An Experimental Study On Micro-Structural And Geotechnical Characteristics Of Expansive Clay Mixed With Eps Granules, Nitin Tiwari, Neelima Satyam, Sanjay Kumar Shukla

ECU Publications Post 2013

© 2020 Pavement structures constructed on the expansive soil subgrade experience a higher upward pressure compared to any other subgrade material. The upward pressure is caused due to high swelling and shrinkage characteristics of expansive clay soil. The present study has investigated and identified the mechanisms by which a remolded expansive soil can be modified to reduce the upward pressure and swelling (heave). To achieve this, a lightweight, environmentally friendly, and high pressure resistive expanded polystyrene (EPS) granules have been used with expansive soil s from three different locations of Madhya Pradesh state, India. The study has been performed to understand ...


A Novel Approach For Using Silica Nanoparticles In A Proppant Pack To Fixate Coal Fines, Faisal Ur Rahman Awan, Alireza Keshavarz, Hamed Akhondzadeh, Sarmad Al-Anssari, Stefan Iglauer May 2020

A Novel Approach For Using Silica Nanoparticles In A Proppant Pack To Fixate Coal Fines, Faisal Ur Rahman Awan, Alireza Keshavarz, Hamed Akhondzadeh, Sarmad Al-Anssari, Stefan Iglauer

ECU Publications Post 2013

Hydraulic fracturing operations in coal seam gas reservoirs are highly prone to release coal fines. Coal fines inevitably cause mechanical pump failure and permeability damage as a result of their hydrophobicity, aggregation in the system and pore-throat blockage. One approach to affix these coal fines at their source, and to retard generation, is to introduce a nanoparticle-treated proppant pack. Thus, this research explores coal fines retention (known as adsorption) in a proppant pack using nanoparticles. In the study, the electrolytic environment, pH, flow rate, temperature and pressure were kept constant, while the variables were concentration of silica nanoparticles (0–0 ...


Coal Fracturing Through Liquid Nitrogen Treatment: A Micro-Computed Tomography Study, Hamed Akhondzadeh, Alireza Keshavarz, Faisal Ur Rahman Awan, Ahmed Z. Al-Yaseri, Stefan Iglauer, Maxim Lebedev May 2020

Coal Fracturing Through Liquid Nitrogen Treatment: A Micro-Computed Tomography Study, Hamed Akhondzadeh, Alireza Keshavarz, Faisal Ur Rahman Awan, Ahmed Z. Al-Yaseri, Stefan Iglauer, Maxim Lebedev

ECU Publications Post 2013

Low permeability of coal has been a constant obstacle to economic production from coalbed methane reservoirs, and liquid nitrogen (LN2) treatment has been investigated as one approach to address this issue. This study examined LN2 fracturing of a bituminous coal at pore-scale through 3D X-ray micro-computed tomography. For this purpose, a cylindrical sample was immersed into LN2 for 60 min. The micro-CT results clearly showed that the rapid freezing of the coal with LN2 generated fracture planes with large apertures originating from the pre-existing cleats in the rock. This treatment also connected original cleats with originally ...


Irradiation Induced Elongation Of Fe Nanoparticles Embedded In Silica Films, E. A. Dawi, T. Ommar, R. Ackermann, A. A. Karar Apr 2020

Irradiation Induced Elongation Of Fe Nanoparticles Embedded In Silica Films, E. A. Dawi, T. Ommar, R. Ackermann, A. A. Karar

ECU Publications Post 2013

© 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. Irradiation with swift heavy ions causes the deformation of Ferric nanoparticles in direction of the ion beam. Fe nanoparticles with mean diameter of about 20 nm were prepared by gas flow sputtering and subsequently confined within silica films. Two silica films wherein two different densities of Fe nanoparticles are encapsulated were irradiated with 50 MeV Ag ions with fluences of few 1014 ions.cm−2 at 300 K and normal incidence. Transmission electron microscopy analysis shows that the spherical Fe nanoparticles are deformed into prolate nanorods ...


A Graph Automorphic Approach For Placement And Sizing Of Charging Stations In Ev Network Considering Traffic, Hossein Parastvand, Valeh Moghaddam, Octavian Bass, Mohammad A.S. Masoum, Airlie Chapman, Stefan Lachowicz Jan 2020

A Graph Automorphic Approach For Placement And Sizing Of Charging Stations In Ev Network Considering Traffic, Hossein Parastvand, Valeh Moghaddam, Octavian Bass, Mohammad A.S. Masoum, Airlie Chapman, Stefan Lachowicz

ECU Publications Post 2013

This paper proposes a novel graph-based approach with automorphic grouping for the modelling, synthesis, and analysis of electric vehicle (EV) networks with charging stations (CSs) that considers the impacts of traffic. The EV charge demands are modeled by a graph where nodes are positioned at potential locations for CSs, and edges represent traffic flow between the nodes. A synchronization protocol is assumed for the network where the system states correspond to the waiting time at each node. These models are then utilized for the placement and sizing of CSs in order to limit vehicle waiting times at all stations below ...


Nano-Mechanical Properties And Pore-Scale Characterization Of Different Rank Coals, Yihuai Zhang, Maxim Lebedev, Gregory Smith, Yu Jing, Andreas Busch, Stefan Iglauer Jan 2020

Nano-Mechanical Properties And Pore-Scale Characterization Of Different Rank Coals, Yihuai Zhang, Maxim Lebedev, Gregory Smith, Yu Jing, Andreas Busch, Stefan Iglauer

ECU Publications Post 2013

Characterization of coal micro-structure and the associated rock mechanical properties are of key importance for coal seam exploration, coal bed methane development, enhanced coal bed methane production and CO2 storage in deep coal seams. Considerable knowledge exists about coal chemical properties, but less is known about the nanoscale to the micro-scale structure of coals and how they change with coal strength across coal ranks. Thus, in this study, 3D X-ray micro-computed tomography (with a voxel size of 3.43 µm) and nano-indentation tests were conducted on coal samples of different ranks from peat to anthracite. The micro-structure of peats showed ...


Robust Placement And Sizing Of Charging Stations From A Novel Graph Theoretic Perspective, Hossein Parastvand, Octavian Bass, Mohammad A. S. Masoum, Airlie Chapman, Stefan Lachowicz Jan 2020

Robust Placement And Sizing Of Charging Stations From A Novel Graph Theoretic Perspective, Hossein Parastvand, Octavian Bass, Mohammad A. S. Masoum, Airlie Chapman, Stefan Lachowicz

ECU Publications Post 2013

This paper proposes analytical approaches to extend the capacity of existing networks of electric vehicles (EVs) by placement of additional charging stations (CSs) as well as determining the sizes of existing and new CSs in order to handle future expansions of EVs. The EV flow at CSs is modeled by a graph where nodes are potential locations for CSs and edges are uncertain parameters representing the variable EV flow at CSs. The required extra CS locations are explored by transforming the CS placement problem into a controllability framework addressed by maximum matching principle (MMP). To find the sizes of each ...


Stable Dispersion Of Coal Fines During Hydraulic Fracturing Flowback In Coal Seam Gas Reservoir: An Experimental Study, Faisal Ur Rahman Awan, Alireza Keshavarz, Hamed Akhondzadeh, Sarmad Al-Anssari, Ahmed Al-Yaseri, Ataollah Nosrati, Muhammad Ali, Sefan Iglauer Jan 2020

Stable Dispersion Of Coal Fines During Hydraulic Fracturing Flowback In Coal Seam Gas Reservoir: An Experimental Study, Faisal Ur Rahman Awan, Alireza Keshavarz, Hamed Akhondzadeh, Sarmad Al-Anssari, Ahmed Al-Yaseri, Ataollah Nosrati, Muhammad Ali, Sefan Iglauer

ECU Publications Post 2013

In subterranean coal seam gas (CSG) reservoirs, massive amounts of small-sized coal fines are released during the production and development stages, especially during hydraulic fracturing stimulation. These coal fines inevitably cause mechanical pump failure and permeability damage due to aggregation and subsequent pore-throat blockage. This aggregation behavior is thus of key importance in CSG production and needs to be minimized. Consequently, such coal fines dispersions need to be stabilized, which can be achieved by the formulation of improved fracturing fluids. Here, we thus systematically investigated the effectiveness of two additives (ethanol, 0.5 wt % and SDBS, 0.001 and 0 ...


Review Of Polymer Composites With Diverse Nanofillers For Electromagnetic Interference Shielding, Dimuthu Wanasinghe, Farhad Aslani, Guowei Ma, Daryoush Habibi Jan 2020

Review Of Polymer Composites With Diverse Nanofillers For Electromagnetic Interference Shielding, Dimuthu Wanasinghe, Farhad Aslani, Guowei Ma, Daryoush Habibi

ECU Publications Post 2013

Polymer matrix composites have generated a great deal of attention in recent decades in various fields due to numerous advantages polymer offer. The advancement of technology has led to stringent requirements in shielding materials as more and more electronic devices are known to cause electromagnetic interference (EMI) in other devices. The drive to fabricate alternative materials is generated by the shortcomings of the existing metallic panels. While polymers are more economical, easy to fabricate, and corrosion resistant, they are known to be inherent electrical insulators. Since high electrical conductivity is a sought after property of EMI shielding materials, polymers with ...


Performance Improvement Of Thermal-Driven Membrane-Based Solar Desalination Systems Using Nanofluid In The Feed Stream, Abdellah Shafieian, Muhammad Rizwan Azhar, Mehdi Khiadani, Tushar Kanti Sen Jan 2020

Performance Improvement Of Thermal-Driven Membrane-Based Solar Desalination Systems Using Nanofluid In The Feed Stream, Abdellah Shafieian, Muhammad Rizwan Azhar, Mehdi Khiadani, Tushar Kanti Sen

ECU Publications Post 2013

Different techniques have been proposed so far to improve the performance of thermal-driven membrane modules applied in solar desalination systems. These techniques have increased the freshwater productivity of the system but at the cost of its increased overall specific energy requirement. Due to this major drawback, the main objective of this study is to implement nanofluid in the feed stream of a heat pipe solar membrane-based desalination system, which not only aims to improve the freshwater productivity of the system, but also has the capability of decreasing its specific energy requirement. Synthetic seawater (with the salinity of 3.5%) was ...


Machinability Of Al2024, Al6061, And Al5083 Alloys Using Multi-Hole Simultaneous Drilling Approach, Muhammad Aamir, Majid Tolouei-Rad, Khaled Giasin, Ana Vafadar Jan 2020

Machinability Of Al2024, Al6061, And Al5083 Alloys Using Multi-Hole Simultaneous Drilling Approach, Muhammad Aamir, Majid Tolouei-Rad, Khaled Giasin, Ana Vafadar

ECU Publications Post 2013

Aluminium alloys are extensively used in different industries due to their good mechanical properties, machinability, low cost and reliable inspection. Drilling is one of the most important machining processes for assembly operations. The number of holes required in an assembly may vary from several holes to millions depending on the application which increases the manufacturing time and costs. In this study, a multi-spindle drill head also known as the poly-drill head is used to perform multi-hole simultaneous drilling with the aim to increase productivity. Dry drilling tests are performed on Al2024, Al6061, and Al5083 aluminium alloys using uncoated carbide tools ...


Agile Methodology Of Well Pad Development, Aleksandr Abramov Jan 2020

Agile Methodology Of Well Pad Development, Aleksandr Abramov

ECU Publications Post 2013

© 2020, The Author(s). Placing of wells in clusters with unequal number of thereof is an emerging concept of well pad development which still requires scrutiny even from a theoretical standpoint. The concept has its potential in improving economic efficiency of one of the most capital intensive processes in upstream sector of petroleum industry—the well pad drilling. To advocate and strengthen this profitability enhancing potential, this work integrates clustering of unequal number of wells into modern project management methodologies (agile project management), which has not been done before. It is shown that such symbiosis, which is called here the ...


Leak Location Based On Pds-Vmd Of Leakage-Induced Vibration Signal Under Low Snr In Water-Supply Pipelines, Shuaiyong Li, Chuanqiang Xia, Zhenhua Cheng, Weipei Mao, Ying Liu, Daryoush Habibi Jan 2020

Leak Location Based On Pds-Vmd Of Leakage-Induced Vibration Signal Under Low Snr In Water-Supply Pipelines, Shuaiyong Li, Chuanqiang Xia, Zhenhua Cheng, Weipei Mao, Ying Liu, Daryoush Habibi

ECU Publications Post 2013

Leak location in water-supply pipelines is of great significance in order to preserve water resources and reduce economic losses. Cross-correlation (CC) based leak location is a popular and effective method in water-supply pipelines (WSP). However, with a decrease of signal to noise ratio (SNR), the errors of time-delay estimation (TDE) based on CC will become larger making it almost impossible to determine a leakage position. Hence, this work proposes leak location based on a combination of phase difference spectrum and variational mode decomposition (PDS-VMD) of leakage-induced vibration signal under low SNR for WSP. Firstly, the leakage-induced vibration signal is decomposed ...


Evaluation Of Microstructure Variation Of Tc11 Alloy After Electroshocking Treatment, Lechun Xie, Chang Liu, Yanli Song, Haojie Guo, Zhongqi Wang, Lin Hua, Liqiang Wang, Lai-Chang Zhang Jan 2020

Evaluation Of Microstructure Variation Of Tc11 Alloy After Electroshocking Treatment, Lechun Xie, Chang Liu, Yanli Song, Haojie Guo, Zhongqi Wang, Lin Hua, Liqiang Wang, Lai-Chang Zhang

ECU Publications Post 2013

Electro-shocking treatment (EST) has been investigated as a pathway to optimise the microstructure and mechanical properties of titanium alloys. The thermal conditions introduced by EST resulted in a phase transformation from α to β. The fraction of β phase decreased from 25.27% to 19.47% after EST for 0.02 s, which was possibly caused by the recrystallization of α phase. The application of EST for 0.04 s resulted in an increase in volume fraction of the β phase to 26.95%. The energy introduced by EST resulted in changes to the direction and intensity of texture within ...


Dealloyed Porous Gold Anchored By: In Situ Generated Graphene Sheets As High Activity Catalyst For Methanol Electro-Oxidation Reaction, Hui Xu, Shuai Liu, Xiaoliang Pu, Kechang Shen, Laichang Zhang, Xiaoguang Wang, Jingyu Qin, Weimin Wang Jan 2020

Dealloyed Porous Gold Anchored By: In Situ Generated Graphene Sheets As High Activity Catalyst For Methanol Electro-Oxidation Reaction, Hui Xu, Shuai Liu, Xiaoliang Pu, Kechang Shen, Laichang Zhang, Xiaoguang Wang, Jingyu Qin, Weimin Wang

ECU Publications Post 2013

A novel one-step method to prepare the nanocomposites of reduced graphene oxide (RGO)/nanoporous gold (NPG) is realized by chemically dealloying an Al2Au precursor. The RGO nanosheets anchored on the surface of NPG have a cicada wing like shape and act as both conductive agent and buffer layer to improve the catalytic ability of NPG for methanol electro-oxidation reaction (MOR). This improvement can also be ascribed to the microstructure change of NPG in dealloying with RGO. This work inspires a facile and economic method to prepare the NPG based catalyst for MOR.


Experimental Investigation Into L-Arg And L-Cys Eco-Friendly Surfactants In Enhanced Oil Recovery By Considering Ift Reduction And Wettability Alteration, Hamed Foroughi Asl, Ghasem Zargar, Abbas Khaksar Manshad, Mohammad Ali Takassi, Jagar A. Ali, Alireza Keshavarz Jan 2020

Experimental Investigation Into L-Arg And L-Cys Eco-Friendly Surfactants In Enhanced Oil Recovery By Considering Ift Reduction And Wettability Alteration, Hamed Foroughi Asl, Ghasem Zargar, Abbas Khaksar Manshad, Mohammad Ali Takassi, Jagar A. Ali, Alireza Keshavarz

ECU Publications Post 2013

Surfactant flooding is an important technique used to improve oil recovery from mature oil reservoirs due to minimizing the interfacial tension (IFT) between oil and water and/or altering the rock wettability toward water-wet using various surfactant agents including cationic, anionic, non-ionic, and amphoteric varieties. In this study, two amino-acid based surfactants, named lauroyl arginine (l-Arg) and lauroyl cysteine (l-Cys), were synthesized and used to reduce the IFT of oil–water systems and alter the wettability of carbonate rocks, thus improving oil recovery from oil-wet carbonate reservoirs. The synthesized surfactants were characterized using Fourier transform infrared spectroscopy and nuclear magnetic ...


Nitrogen-Doped Carbon Nanospheres-Modified Graphitic Carbon Nitride With Outstanding Photocatalytic Activity, Qiaoran Liu, Hao Tian, Zhenghua Dai, Hongqi Sun, Jian Liu, Zhimin Ao, Shaobin Wang, Chen Han, Shaomin Liu Jan 2020

Nitrogen-Doped Carbon Nanospheres-Modified Graphitic Carbon Nitride With Outstanding Photocatalytic Activity, Qiaoran Liu, Hao Tian, Zhenghua Dai, Hongqi Sun, Jian Liu, Zhimin Ao, Shaobin Wang, Chen Han, Shaomin Liu

ECU Publications Post 2013

Metals and metal oxides are widely used as photo/electro-catalysts for environmental remediation. However, there are many issues related to these metal-based catalysts for practical applications, such as high cost and detrimental environmental impact due to metal leaching. Carbon-based catalysts have the potential to overcome these limitations. In this study, monodisperse nitrogen-doped carbon nanospheres (NCs) were synthesized and loaded onto graphitic carbon nitride (g-C3N4, GCN) via a facile hydrothermal method for photocatalytic removal of sulfachloropyridazine (SCP). The prepared metal-free GCN-NC exhibited remarkably enhanced efficiency in SCP degradation. The nitrogen content in NC critically influences the physicochemical properties and performances of ...


Fe-Based Metallic Glasses And Dyes In Fenton-Like Processes: Understanding Their Intrinsic Correlation, Xueqing Wang, Qiaoyue Zhang, Shun-Xing Liang, Zhe Jia, Wenchang Zhang, Weimin Wang, Lai-Chang Zhang Jan 2020

Fe-Based Metallic Glasses And Dyes In Fenton-Like Processes: Understanding Their Intrinsic Correlation, Xueqing Wang, Qiaoyue Zhang, Shun-Xing Liang, Zhe Jia, Wenchang Zhang, Weimin Wang, Lai-Chang Zhang

ECU Publications Post 2013

Fe-based metallic glasses have been demonstrated as effective heterogeneous catalysts in Fenton-like processes for dye degradation. Yet, currently corresponding studies have limitations due to the limited study object (dyes) and the correlation between metallic glasses and dye pollutants in Fenton-like processes is still not comprehensively studied. Accordingly, this work intensively investigated the thermal catalytic behavior correlations between two Fe-based metallic glasses (Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3) and eight different dyes. Results indicated a lower activation energy in the more active metallic glass and a dependence of the activation energy of Fe-based metallic glasses in dye solutions. In addition, a high ...


Performance Of A Dual Helical Ribbon Impeller In A Two-Phase (Gas-Liquid) Stirred Tank Reactor, Maryam Amiraftabi, Mehdi Khiadani, Hussein A. Mohammed Jan 2020

Performance Of A Dual Helical Ribbon Impeller In A Two-Phase (Gas-Liquid) Stirred Tank Reactor, Maryam Amiraftabi, Mehdi Khiadani, Hussein A. Mohammed

ECU Publications Post 2013

The performance of a dual helical ribbon impeller in a gassed stirred tank reactor filled with a shear-thinning polymer has been investigated experimentally in this study. Sodium carboxymethyl cellulose with different concentrations were applied to change the viscosity and rheological behaviour of working fluid. Titration reaction between HCl and NaOH then took place inside the reactor under controlled pH, evaluating the influence of a dual helical ribbon impeller on the performance of a two-phase agitated reactor. The impact of impeller rotational speed, gas flow rate, viscosity, and clearance to the bottom on power uptake and mixing time are explored. The ...


Thermal-Hydraulic Performance In A Microchannel Heat Sink Equipped With Longitudinal Vortex Generators (Lvgs) And Nanofluid, Basel Al Muallim, Mazlan A. Wahid, Hussain A. Mohammed, Mohammed Kamil, Daryoush Habibi Jan 2020

Thermal-Hydraulic Performance In A Microchannel Heat Sink Equipped With Longitudinal Vortex Generators (Lvgs) And Nanofluid, Basel Al Muallim, Mazlan A. Wahid, Hussain A. Mohammed, Mohammed Kamil, Daryoush Habibi

ECU Publications Post 2013

In this study, the numerical conjugate heat transfer and hydraulic performance of nanofluids flow in a rectangular microchannel heat sink (RMCHS) with longitudinal vortex generators (LVGs) was investigated at different Reynolds numbers (200-1200). Three-dimensional simulations are performed on a microchannel heated by a constant temperature with five different configurations with different angles of attack for the LVGs under laminar flow conditions. The study uses five different nanofluid combinations of Al2O3 or CuO, containing low volume fractions in the range of 0.5% to 3.0% with various nanoparticle sizes that are dispersed in pure water, PAO (Polyalphaolefin) or ethylene glycol ...


3d Magneto-Buoyancy-Thermocapillary Convection Of Cnt-Water Nanofluid In The Presence Of A Magnetic Field, Lioua Kolsi, Salem Algarni, Hussain A. Mohammed, Walid Hassen, Emtinene Lajnef, Walid Aich, Mohammed Almeshaal Jan 2020

3d Magneto-Buoyancy-Thermocapillary Convection Of Cnt-Water Nanofluid In The Presence Of A Magnetic Field, Lioua Kolsi, Salem Algarni, Hussain A. Mohammed, Walid Hassen, Emtinene Lajnef, Walid Aich, Mohammed Almeshaal

ECU Publications Post 2013

Anumerical study is performed to investigate the effects of adding Carbon Nano Tube (CNT) and applying a magnetic field in two directions (vertical and horizontal) on the 3D-thermo-capillary natural convection. The cavity is differentially heated with a free upper surface. Governing equations are solved using the finite volume method. Results are presented in term of flow structure, temperature field and rate of heat transfer. In fact, results revealed that the flow structure and heat transfer rate are considerably affected by the magnitude and the direction of the magnetic field, the presence of thermocapillary forces and by increasing nanoparticles volume fraction ...


Solids Velocity Measurement Using Electric Capacitance Sensor Assemblies, Usama Abrar, Liu Shi, Nasif Raza Jaffri, Qin Li, Hassan Raza Sindhu, Mian Waqas Omar Jan 2020

Solids Velocity Measurement Using Electric Capacitance Sensor Assemblies, Usama Abrar, Liu Shi, Nasif Raza Jaffri, Qin Li, Hassan Raza Sindhu, Mian Waqas Omar

ECU Publications Post 2013

This paper covers the application of the cross-correlation method for measuring the velocity of solid particles. Capacitive electrodes are used as primary sensors to measure the time required by the solid particles to cover a known distance between the electrodes. The capacitive variations of both the electrode sensors are stored in computer synchronously for offline estimation of the velocity of the solid particles. Single glass marble is used as a solid particle to conduct the performance in the lab for its good signal to noise ratio (SNR) and vivid graphs. Matlab R2018a is used as a programming tool to perform ...