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Articles 1 - 30 of 98
Full-Text Articles in Engineering
Electroshock Treatment Dependent Microstructural Evolution And Mechanical Properties Of Near-Β Titanium Alloy Manufactured By Directed Energy Deposition, Haojie Guo, Pu Liu, Xunpeng Qin, Yanli Song, Dongsheng Qian, Lechun Xie, Liqiang Wang, Lai-Chang Zhang, Lin Hua
Electroshock Treatment Dependent Microstructural Evolution And Mechanical Properties Of Near-Β Titanium Alloy Manufactured By Directed Energy Deposition, Haojie Guo, Pu Liu, Xunpeng Qin, Yanli Song, Dongsheng Qian, Lechun Xie, Liqiang Wang, Lai-Chang Zhang, Lin Hua
Research outputs 2014 to 2021
Effects of electroshock treatment (EST) on the microstructural evolution and mechanical properties of near-β titanium alloy (Ti-55531) formed by directed energy deposition (DED) was studied in this work. With the increase in EST time, the average hardness of specimen decreased from 426 HV to 316 HV, and the fracture strain increased significantly, which was attributed to the uniform dispersion of α phase along grain boundaries and inside the β grains. After EST, the texture intensity decreased in terms of the orientation distribution function (ODF), which was ascribed to the redistribution of α phase. Moreover, more atomic vacancies and lattice distortion …
Revised Semiempirical Approach To Predict The Occurrence Of Twinning In Titanium Alloys, Chirag Dhirajlal Rabadia, Syed Faraz Jawed, Jincheng Wang, Milind Siddhpura, Arti Siddhpura
Revised Semiempirical Approach To Predict The Occurrence Of Twinning In Titanium Alloys, Chirag Dhirajlal Rabadia, Syed Faraz Jawed, Jincheng Wang, Milind Siddhpura, Arti Siddhpura
Research outputs 2014 to 2021
A revised semiempirical approach, considering the average values of the valence electron to atom ratio (e/a̅) and a difference in atomic radii of alloying element/s and the base element (Δr¯), is proposed to predict the twin formation in titanium alloys. The revised e/ā versus Δr¯ diagram is plotted, considering the reported results of 90 titanium alloys fabricated using various processing methods. A new twin/slip boundary has been plotted and recommended based on the revised e/ā versus Δr¯ diagram. The conventional maximum limit reported for the twinning in titanium alloys is e/ā = 4.20; however, it has been found that twinning …
Α-Fe2o3/Graphene Oxide Powder And Thin Film Nanocomposites As Peculiar Photocatalysts For Dye Removal From Wastewater, Mahsa Khoshnam, Javad Farahbakhsh, Masoumeh Zargar, Abdul Wahab Mohammad, Abdelbaki Benamor, Wei Lun Ang, Ebrahim Mahmoudi
Α-Fe2o3/Graphene Oxide Powder And Thin Film Nanocomposites As Peculiar Photocatalysts For Dye Removal From Wastewater, Mahsa Khoshnam, Javad Farahbakhsh, Masoumeh Zargar, Abdul Wahab Mohammad, Abdelbaki Benamor, Wei Lun Ang, Ebrahim Mahmoudi
Research outputs 2014 to 2021
In this study, hematite graphene oxide (αFe2O3-GO) powder nanocomposites and thin-film hematite graphene oxide (αFe2O3-GO) were synthesized for application in the removal of Rhodamine B (RhB) from textile wastewater. αFe2O3-GO nanomaterials were placed onto the FTO substrate to form a thin layer of nanocomposites. Different analysis including XRD, FTIR, Raman spectra, XPS, and FESEM were done to analyze the morphology, structure, and properties of the synthesized composites as well as the chemical interactions of αFe2O3 with GO. The photocatalytic performance of two synthesized composites was compared with different concentrations of αFe2O3-GO. The results showed that powder nanocomposites are more effective …
Hydrogen Underground Storage Efficiency In A Heterogeneous Sandstone Reservoir, Doaa Saleh Mahdi, Emad A. Al-Khdheeawi, Yujie Yuan, Yihuai Zhang, Stefan Iglauer
Hydrogen Underground Storage Efficiency In A Heterogeneous Sandstone Reservoir, Doaa Saleh Mahdi, Emad A. Al-Khdheeawi, Yujie Yuan, Yihuai Zhang, Stefan Iglauer
Research outputs 2014 to 2021
Underground hydrogen storage has been recognized as a key technology for storing enormous amounts of hydrogen, thus aiding in the industrial-scale application of a hydrogen economy. However, underground hydrogen storage is only poorly understood, which leads to high project risk. This research thus examined the effect of caprock availability and hydrogen injection rate on hydrogen recovery factor and hydrogen leakage rate to address some fundamental questions related to underground hydrogen storage. A three dimensional heterogeneous reservoir model was developed, and the impact of caprock and hydrogen injected rate on hydrogen underground storage efficiency were analysed with the model. The results …
Microplastics Fouling And Interaction With Polymeric Membranes: A Review, Mitra Golgoli, Mehdi H. Khiadani, Abdellah Shafieian, Tushar K. Sen, Y. Hartanto, M. L. Johns, Masoumeh Zargar
Microplastics Fouling And Interaction With Polymeric Membranes: A Review, Mitra Golgoli, Mehdi H. Khiadani, Abdellah Shafieian, Tushar K. Sen, Y. Hartanto, M. L. Johns, Masoumeh Zargar
Research outputs 2014 to 2021
The emergence and accumulation of microplastics (MPs) in various aquatic environments have recently raised significant concerns. Wastewater treatment plants (WWTPs) have been identified as one of the major sources of MPs discharge to the environment, implying a substantial need to improve advanced techniques for more efficient removal of MPs. Polymeric membranes have been proven effective in MPs removal. However, fouling is the main drawback of membrane processes and MPs can foul the membranes due to their small size and specific surface properties. Hence, it is important to investigate the impacts of MPs on membrane fouling to develop efficient membrane-based techniques …
Micro-Proppant Placement In Hydraulic And Natural Fracture Stimulation In Unconventional Reservoirs: A Review, Masoud Aslannezhad, Azim Kalantariasl, Zhenjiang You, Stefan Iglauer, Alireza Keshavarz
Micro-Proppant Placement In Hydraulic And Natural Fracture Stimulation In Unconventional Reservoirs: A Review, Masoud Aslannezhad, Azim Kalantariasl, Zhenjiang You, Stefan Iglauer, Alireza Keshavarz
Research outputs 2014 to 2021
Tight hydrocarbon reservoirs require stimulation to improve the recovery of oil and gas resources. Hydraulic fracturing is a technique extensively employed in the oil and gas industry to generate fractures including primary and secondary fractures. To keep these fractures open, proppants are used. However, some of these ractures are very narrow for conventional proppants to penetrate and prop, hence smaller proppants called micro-proppants are required. These micro-proppants can improve the hydraulic conductivity of both, the primary fractures and the untouched microfractures, leading to enhanced oil and gas recovery. This paper presents a critical review on the progress of current micro-proppants …
Influence Of Pressure, Temperature And Organic Surface Concentration On Hydrogen Wettability Of Caprock, Implications For Hydrogen Geo-Storage, Muhammad Ali, Nurudeen Yekeen, Nilanjan Pal, Alireza Keshavarz, Stefan Iglauer, Hussein Hoteit
Influence Of Pressure, Temperature And Organic Surface Concentration On Hydrogen Wettability Of Caprock, Implications For Hydrogen Geo-Storage, Muhammad Ali, Nurudeen Yekeen, Nilanjan Pal, Alireza Keshavarz, Stefan Iglauer, Hussein Hoteit
Research outputs 2014 to 2021
Hydrogen (H2) as a cleaner fuel has been suggested as a viable method of achieving the de-carbonization objectives and meeting increasing global energy demand. However, successful implementation of a full-scale hydrogen economy requires large-scale hydrogen storage (as hydrogen is highly compressible). A potential solution to this challenge is injecting hydrogen into geologic formations from where it can be withdrawn again at later stages for utilization purposes. The geo-storage capacity of a porous formation is a function of its wetting characteristics, which strongly influence residual saturations, fluid flow, rate of injection, rate of withdrawal, and containment security. However, literature …
Quantifying Techno-Economic Indicators' Impact On Isolated Renewable Energy Systems, Muhammad Shahzad Javed, Tao Ma, Navid Mousavi, Salman Ahmed, Henrik Lund, Hongxing Yang, Yanjun Dai
Quantifying Techno-Economic Indicators' Impact On Isolated Renewable Energy Systems, Muhammad Shahzad Javed, Tao Ma, Navid Mousavi, Salman Ahmed, Henrik Lund, Hongxing Yang, Yanjun Dai
Research outputs 2014 to 2021
Addressing climate change with the rising global energy usage necessitates electricity sector decarbonization by rapidly moving toward flexible and efficient off-grid renewable energy systems (RESs). This paper analyzes the wind and solar micro-grids, with batteries and pumped hydro storage for a robust off-grid RES techno-economic operation, while considering diverse multi-objective optimization cases. This research has considered the RES variable operational losses in the developed methodology and relations between different indicators are evaluated, revealing a basic understanding between them. The results reveal that the reliability index is inversely related to the oversupply index, while directly related to the system self-sufficiency index. …
Wastewater Remediation Technologies Using Macroscopic Graphene-Based Materials: A Perspective, Rajan Arjan Kalyan Hirani, Abdul Hannan Asif, Nasir Rafique, Lei Shi, Shu Zhang, Hong Wu, Hongqi Sun
Wastewater Remediation Technologies Using Macroscopic Graphene-Based Materials: A Perspective, Rajan Arjan Kalyan Hirani, Abdul Hannan Asif, Nasir Rafique, Lei Shi, Shu Zhang, Hong Wu, Hongqi Sun
Research outputs 2014 to 2021
Three-dimensional (3D) graphene-based macrostructures are being developed to combat the issues associated with two-dimensional (2D) graphene materials in practical applications. The 3D macrostructures (3DMs), for example, membranes, fibres, sponges, beads, and mats, can be formed by the self-assembly of 2D graphene-based precursors with exceptional surface area and unique chemistry. With rational design, the 3D macrostructures can then possess outstanding properties and exclusive structures. Thanks to various advantages, these macrostructures are competing in a variety of applications with promising performances unlike the traditional activated carbons, biochars and hydrochars, which have less flexibilities for modifications towards versatile applications. However, despite having such …
Co2-Wettability Reversal Of Cap-Rock By Alumina Nanofluid: Implications For Co2 Geo-Storage, Muhammad Ali, Adnan Aftab, Faisal Ur Rahman Awan, Hamed Akhondzadeh, Alireza Keshavarz, Ali Saeedi, Stefan Iglauer, Mohammad Sarmadivaleh
Co2-Wettability Reversal Of Cap-Rock By Alumina Nanofluid: Implications For Co2 Geo-Storage, Muhammad Ali, Adnan Aftab, Faisal Ur Rahman Awan, Hamed Akhondzadeh, Alireza Keshavarz, Ali Saeedi, Stefan Iglauer, Mohammad Sarmadivaleh
Research outputs 2014 to 2021
© 2021 Elsevier B.V. The usage of nanofluids is vast in different applications of nano-energy. These minute nanoparticles can be used to alter the hydrophobicity into hydrophilicity for CO2-brine-mineral systems in the presence of organic acids. Nonetheless, the literature lacks the information for the behavior of nanoparticles and its associated concentrations in the presence of organic acids at the reservoir (high temperature and high pressure) conditions. In this study, we have investigated that how different alkyl chain organic acids impact the wettability of mica muscovite for different ageing times (7 days and one year) and how this impact can be …
Effect Of Humic Acid On Co2-Wettability In Sandstone Formation, Mujahid Ali, Faisal Ur Rahman Awan, Muhammad Ali, Ahmed Al-Yaseri, Muhammad Arif, Mónica Sánchez-Román, Alireza Keshavarz, Stefan Iglauer
Effect Of Humic Acid On Co2-Wettability In Sandstone Formation, Mujahid Ali, Faisal Ur Rahman Awan, Muhammad Ali, Ahmed Al-Yaseri, Muhammad Arif, Mónica Sánchez-Román, Alireza Keshavarz, Stefan Iglauer
Research outputs 2014 to 2021
© 2020 Elsevier Inc. Hypothesis: Millions of tons of CO2 are stored in CO2 geological storage (CGS) formations (depleted oil reservoirs and deep saline aquifers) every year. These CGS formations naturally contain small concentrations of water-soluble organic components in particular humic acid (HA), which may drastically affect the rock wettability - a significant factor determining storage capacities and containment security. Hence, it is essential to characterise the effect of humic acid concentration on CO2-wettability and its associated impact on storage capacity. Experimental: To achieve this, we measured advancing and receding contact angles at reservoir conditions using the pendant drop tilted …
Tailored Ionic Liquid For Metal-Free Carbons Toward Oxygen Reduction Reaction, Jian Gao, Xiujuan Chu, Xiaoyao Tan, Hongqi Sun, Zhen Yin, Shaobin Wang
Tailored Ionic Liquid For Metal-Free Carbons Toward Oxygen Reduction Reaction, Jian Gao, Xiujuan Chu, Xiaoyao Tan, Hongqi Sun, Zhen Yin, Shaobin Wang
Research outputs 2014 to 2021
Carbon catalysts have been widely used for various electrochemical reactions including oxygen reduction reaction (ORR) and their catalytic activities are significantly dependent on carbon precursors. Ionic liquids (ILs) are promising precursors of heteroatom-doped carbon electrocatalysts for ORR. Herein, we demonstrated that an IL tailored with π-π conjugated interaction introduced by a π-electron enriched aromatic ring can offer a carbon material with improved ORR activity.
Graph Automorphic Approaches To The Robustness Of Complex Networks, Hossein Parastvand, Airlie Chapman, Octavian Bass, Stefan Lachowicz
Graph Automorphic Approaches To The Robustness Of Complex Networks, Hossein Parastvand, Airlie Chapman, Octavian Bass, Stefan Lachowicz
Research outputs 2014 to 2021
© 2020 Elsevier Ltd Leveraging on graph automorphic properties of complex networks (CNs), this study investigates three robustness aspects of CNs including the robustness of controllability, disturbance decoupling, and fault tolerance against failure in a network element. All these aspects are investigated using a quantified notion of graph symmetry, namely the automorphism group, which has been found implications for the network controllability during the last few years. The typical size of automorphism group is very big. The study raises a computational issue related to determining the whole set of automorphism group and proposes an alternative approach which can attain the …
On The Toe Stability Of Rubble Mound Structures, Amir Etemad-Shahidi, Meysam Bali, Marcel R. A. Van Gent
On The Toe Stability Of Rubble Mound Structures, Amir Etemad-Shahidi, Meysam Bali, Marcel R. A. Van Gent
Research outputs 2014 to 2021
Toe design is an important task for coastal engineers as it ensures the stability of the main armor layer and prevents scour in front of the armor slope. Several laboratory experiments have been conducted to investigate the toe stability using different testing approaches, i.e. damage due to a single test condition and cumulative damage due to a number of conditions. In addition, the methods of measuring and reporting damage to the toe are not the same as some researchers have counted only stones that were washed away from the toe; while others counted all the stones that have been displaced. …
Application Of Short-Time Stochastic Subspace Identification To Estimate Bridge Frequencies From A Traversing Vehicle, Nan Jin, Y. B. Yang, Elias G. Dimitrakopoulos, Themelina S. Paraskeva, Lambros S. Katafygiotis
Application Of Short-Time Stochastic Subspace Identification To Estimate Bridge Frequencies From A Traversing Vehicle, Nan Jin, Y. B. Yang, Elias G. Dimitrakopoulos, Themelina S. Paraskeva, Lambros S. Katafygiotis
Research outputs 2014 to 2021
© 2020 Elsevier Ltd This study establishes a short-time stochastic subspace identification (ST-SSI) framework to estimate bridge frequencies by processing the dynamic response of a traversing vehicle. The formulation uses a dimensionless description of the response that simplifies the vehicle-bridge interaction (VBI) problem and brings forward the minimum number of parameters required for the identification. With the aid of the dimensionless parameters the analysis manages to successfully apply ST-SSI despite the time-varying nature of the VBI system. Further, the proposed approach eliminates the adverse effect of the road surface roughness using a transformed residual vehicle response obtained from two traverses …
Fabrication Of Black Silicon Via Metal-Assisted Chemical Etching—A Review, Mohammad Yasir Arafat, Mohammad Aminul Islam, Ahmad W. B. Mahmood, Fairuz Abdullah, Mohammad Nur-E-Alam, Tiong Sieh Kiong, Nowshad Amin
Fabrication Of Black Silicon Via Metal-Assisted Chemical Etching—A Review, Mohammad Yasir Arafat, Mohammad Aminul Islam, Ahmad W. B. Mahmood, Fairuz Abdullah, Mohammad Nur-E-Alam, Tiong Sieh Kiong, Nowshad Amin
Research outputs 2014 to 2021
The metal-assisted chemical etching (MACE) technique is commonly employed for texturing the wafer surfaces when fabricating black silicon (BSi) solar cells and is considered to be a potential technique to improve the efficiency of traditional Si-based solar cells. This article aims to review the MACE technique along with its mechanism for Ag-, Cu- and Ni-assisted etching. Primarily, several essential aspects of the fabrication of BSi are discussed, including chemical reaction, etching direction, mass transfer, and the overall etching process of the MACE method. Thereafter, three metal catalysts (Ag, Cu, and Ni) are critically analyzed to identify their roles in producing …
Drastic Enhancement Of Co2 Adsorption Capacity By Negatively Charged Sub-Bituminous Coal, Hussein R. Abid, Stefan Iglauer, Ahmed Al-Yaseri, Alireza Keshavarz
Drastic Enhancement Of Co2 Adsorption Capacity By Negatively Charged Sub-Bituminous Coal, Hussein R. Abid, Stefan Iglauer, Ahmed Al-Yaseri, Alireza Keshavarz
Research outputs 2014 to 2021
Climate change is a key problem of the 21st century. Climate change is mainly caused by anthropogenic CO2 emissions, and one solution to this problem is to capture and store CO2 in deep coal seams, where it is immobilized by adsorption to the coal surface. Here we propose to modify the coal with methyl orange (MO), a typical dye that is also a major pollutant of the hydrosphere and removed thereby. Thus, raw and MO-modified coals were characterized to investigate their thermal stabilities, textural properties, carbon contents, surface characteristics, and CO2 adsorption on the coal samples was …
The Role Of Leadership In Aviation Safety And Aircraft Airworthiness, Ayiei Ayiei, Luke Pollock, Fatima Najeeb Khan, John Murray, Glenn Baxter, Graham Wild
The Role Of Leadership In Aviation Safety And Aircraft Airworthiness, Ayiei Ayiei, Luke Pollock, Fatima Najeeb Khan, John Murray, Glenn Baxter, Graham Wild
Research outputs 2014 to 2021
Ensuring aircraft are technically safe to operate is the realm of airworthiness, literally worthy of being in the air. This is achieved not only with technological tools and techniques, or with just personnel and manpower, it is guided and supervised by managers and leaders. As such, the objective of this paper is to understand the role leadership plays in maintaining aviation safety and aircraft airworthiness. To this end, a case study of the Hawker Sidley Nimrod XV230 accident that occured on September 2, 2006 near Kandahar in Afghanistan, was utilized. The study concluded that leadership is a key aspect, specifically …
Current Advances In Syngas (Co + H2) Production Through Bi-Reforming Of Methane Using Various Catalysts: A Review, U. S. Mohanty, Muhammad Ali, Muhammad Rizwan Azhar, Ahmed Al-Yaseri, Alireza Keshavarz, Stefan Iglauer
Current Advances In Syngas (Co + H2) Production Through Bi-Reforming Of Methane Using Various Catalysts: A Review, U. S. Mohanty, Muhammad Ali, Muhammad Rizwan Azhar, Ahmed Al-Yaseri, Alireza Keshavarz, Stefan Iglauer
Research outputs 2014 to 2021
Today, bi - reforming of methane is considered as an emerging replacement for the generation of high-grade synthesis gas (H2:CO = 2.0), and also as an encouraging renewable energy substitute for fossil fuel resources. For achieving high conversion levels of CH4, H2O, and CO2 in this process, appropriate operation variables such as pressure, temperature and molar feed constitution are prerequisites for the high yield of synthesis gas. One of the biggest stumbling blocks for the methane reforming reaction is the sudden deactivation of catalysts, which is attributed to the sintering and coke formation …
Co2 – Brine – Sandstone Wettability Evaluation At Reservoir Conditions Via Nuclear Magnetic Resonance Measurements, Auby Baban, Ahmed Al-Yaseri, Alireza Keshavarz, R. Amin, Stefan Iglauer
Co2 – Brine – Sandstone Wettability Evaluation At Reservoir Conditions Via Nuclear Magnetic Resonance Measurements, Auby Baban, Ahmed Al-Yaseri, Alireza Keshavarz, R. Amin, Stefan Iglauer
Research outputs 2014 to 2021
CO2-rock wettability is a key parameter which governs CO2 trapping capacities and containment security in the context of CO2 geo-sequestration schemes. However, significant uncertainties still exist in terms of predicting CO2 rock wettability at true reservoir conditions. This study thus reports on wettability measurements via independent Nuclear Magnetic Resonance (NMR) experiments on sandstone (CO2–brine systems) to quantify Wettability Indices (WI) using the United States Bureau of Mines (USBM) scale. The results show that CO2 (either molecularly dissolved or as a separate supercritical phase) significantly reduced the hydrophilicity of the sandstone from strongly …
Graphene Nanoplatelets Suspended In Different Basefluids Based Solar Collector: An Experimental And Analytical Study, Omer A. Alawi, Haslinda Mohamed Kamar, Abdul Rahman Mallah, Hussein A. Mohammed, Mohd Aizad Sazrul Sabrudin, Omar A. Hussein, Salim Newaz Kazi, Gholamhassan Najafi
Graphene Nanoplatelets Suspended In Different Basefluids Based Solar Collector: An Experimental And Analytical Study, Omer A. Alawi, Haslinda Mohamed Kamar, Abdul Rahman Mallah, Hussein A. Mohammed, Mohd Aizad Sazrul Sabrudin, Omar A. Hussein, Salim Newaz Kazi, Gholamhassan Najafi
Research outputs 2014 to 2021
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. A flat plate solar collector (FPSC) was analytically studied, with functionalized graphene nanoplatelets (f-GNPs) as its working fluid. Four samples (wt % nanofluids) were prepared in different base fluids such as ethylene glycol (EG), distilled water (DW):EG (70:30), and DW:EG (50:50). Experimental results (via DW) were used to verify the effectiveness of the analytical model. Some of the operating conditions were taken into account in this research, including temperatures, power, and mass flow rates. Experimental techniques were used to elucidate the modified nanofluids’ physicochemical properties, such as its particle sizes, stability, …
The Effect Of Tin-, Ticn-, Tialn-, And Tisin Coated Tools On The Surface Defects And Geometric Tolerances Of Holes In Multi-Spindle Drilling Of Al2024 Alloy, Muhammad Aamir, Adrian Davis, William Keeble, Ugur Koklu, Khaled Giasin, Ana Vafadar, Majid Tolouei Rad
The Effect Of Tin-, Ticn-, Tialn-, And Tisin Coated Tools On The Surface Defects And Geometric Tolerances Of Holes In Multi-Spindle Drilling Of Al2024 Alloy, Muhammad Aamir, Adrian Davis, William Keeble, Ugur Koklu, Khaled Giasin, Ana Vafadar, Majid Tolouei Rad
Research outputs 2014 to 2021
The integrity of machined holes depends on many parameters, some of which are related to the cutting tool (geometry, coating, material). Other influential parameters are related to the machining process variables (spindle speed, feed rate, workpiece material), all of which can affect the quality of the hole and drilling induced damage on its surface. This study investigates the effect of uncoated tools and four types of tool coatings (TiN-, TiCN-, TiAlN-, and TiSiN) on the hole quality and its microstructure. The study analyzed several hole geometrical metrics, namely hole size, circularity, cylindricity, and perpendicularity of an Al2024 aluminum alloy using …
Recent Progress Trend On Abrasive Waterjet Cutting Of Metallic Materials: A Review, Jennifer Milaor Llanto, Majid Tolouei-Rad, Ana Vafadar, Muhammad Aamir
Recent Progress Trend On Abrasive Waterjet Cutting Of Metallic Materials: A Review, Jennifer Milaor Llanto, Majid Tolouei-Rad, Ana Vafadar, Muhammad Aamir
Research outputs 2014 to 2021
Abrasive water jet machining has been extensively used for cutting various materials. In particular, it has been applied for difficult-to-cut materials, mostly metals, which are used in various manufacturing processes in the fabrication industry. Due to its vast applications, in-depth comprehension of the systems behind its cutting process is required to determine its effective usage. This paper presents a review of the progress in the recent trends regarding abrasive waterjet cutting application to extend the understanding of the significance of cutting process parameters. This review aims to append a substantial understanding of the recent improvement of abrasive waterjet machine process …
A Range Error Reduction Technique For Positioning Applications In Sports, Adnan Waqar, Iftekhar Ahmad, Daryoush Habibi, Quoc V. Phung
A Range Error Reduction Technique For Positioning Applications In Sports, Adnan Waqar, Iftekhar Ahmad, Daryoush Habibi, Quoc V. Phung
Research outputs 2014 to 2021
In recent times, ultra-wideband (UWB)-based positioning systems have become popular in sport performance monitoring. UWB positioning system uses time of arrival to calculate the range data between devices (i.e. anchors, tags), and then use trilateration algorithms to estimate position coordinates. In practical applications, non-line-of-sight transmissions and multipath propagations lead to inaccurate range data and lower positioning accuracy. This paper introduces a range error minimisation algorithm to address this limitation of error in range data in UWB-based positioning system. The proposed solution analyses the range error for each anchor and sequentially reduces this error based on the distance between each anchor …
Effect Of Nb On Β→Α″ Martensitic Phase Transformation And Characterization Of New Biomedical Ti-Xnb-3fe-9zr Alloys, Syed Faraz Jawed, Chirag Dhirajlal Rabadia, Fahad Azim, Saad Jawaid Khan
Effect Of Nb On Β→Α″ Martensitic Phase Transformation And Characterization Of New Biomedical Ti-Xnb-3fe-9zr Alloys, Syed Faraz Jawed, Chirag Dhirajlal Rabadia, Fahad Azim, Saad Jawaid Khan
Research outputs 2014 to 2021
A new generation of Ti-xNb-3Fe-9Zr (x=15, 20, 25, 30, 35 wt %) alloys have been designed using various theoretical approaches including DV-xα cluster, molybdenum equivalency, and electron to atom ratio. Afterward, designed alloys are fabricated using cold crucible levitation melting technique. The microstructure and mechanical performances of newly designed alloys are characterized in this work using scanning electron microscope and universal testing machine, respectively. Each alloy demonstrates monolithic β phase except Ti-35Nb-3Fe-9Zr alloy which display dual α″+β phases. Typically, niobium acts as an isomorphous beta stabilizer. However, in this work, formation of martensitic α″ phases occurs at 35 wt % …
Experimental Investigation Of Pressure Drop Performance Of Smooth And Dimpled Single Plate-Fin Heat Exchangers, Kanishk Rauthan, Ferdinando G. Guzzomi, Ana Vafadar, Kevin Hayward, Aakash Hurry
Experimental Investigation Of Pressure Drop Performance Of Smooth And Dimpled Single Plate-Fin Heat Exchangers, Kanishk Rauthan, Ferdinando G. Guzzomi, Ana Vafadar, Kevin Hayward, Aakash Hurry
Research outputs 2014 to 2021
Passive heat exchangers (HXs) form an inseparable part of the manufacturing industry as they provide high-efficiency cooling at minimal overhead costs. Along with the aspects of high thermal cooling, it is essential to monitor pressure loss while using plate-fin HXs because pressure loss can introduce additional power costs to a system. In this paper, an experimental study was conducted to look at the effects of dimples on the pressure drop characteristics of single plate-fin heat exchangers. To enable this, different configurations of National Advisory Committee for Aeronautics (NACA) fins with smooth surfaces and 2 mm-diameter dimples, 4 mm-diameter dimples and …
Breaking-Down And Parameterising Wave Energy Converter Costs Using The Capex And Similitude Methods, Ophelie Choupin, Michael Henriksen, Amir Etemad-Shahidi, Rodger Tomlinson
Breaking-Down And Parameterising Wave Energy Converter Costs Using The Capex And Similitude Methods, Ophelie Choupin, Michael Henriksen, Amir Etemad-Shahidi, Rodger Tomlinson
Research outputs 2014 to 2021
Wave energy converters (WECs) can play a significant role in the transition towards a more renewable-based energy mix as stable and unlimited energy resources. Financial analysis of these projects requires WECs cost and WEC capital expenditure (CapEx) information. However, (i) cost information is often limited due to confidentiality and (ii) the wave energy field lacks flexible methods for cost breakdown and parameterisation, whereas they are needed for rapid and optimised WEC configuration and worldwide site pairing. This study takes advantage of the information provided by Wavepiston to compare different costing methods. The work assesses the Froude-Law-similarities-based “Similitude method” for cost-scaling …
Flow And Heat Transfer Characteristics Of Turbulent Swirling Impinging Jets [Thesis], Muhammad Ikhlaq
Flow And Heat Transfer Characteristics Of Turbulent Swirling Impinging Jets [Thesis], Muhammad Ikhlaq
Theses: Doctorates and Masters
Numerous industrial applications rely on impinging jets to impart convective heat and mass transfer in processes ranging from the cooling of electronic devices and gas turbine blades to drying of paper and food products. Conventionally, non-swirling impinging jets have been employed, but some studies have shown that inducing swirl allows better control of uniformity and improved convective fluxes. A better understanding of the underlying physical mechanisms that lead to such behaviour warrants deeper insights into the flow and heat transfer characteristics of impinging jets, both swirling and non-swirling. Whilst important to achieve, the flow field of an impinging jet is …
Numerical Investigation Of Microchannel Heat Sink With Trefoil Shape Ribs, Sadiq Ali, Faraz Ahmad, Kareem Akhtar, Numan Habib, Muhammad Aamir, Khaled Giasin, Ana Vafadar, Danil Yurievich Pimenov
Numerical Investigation Of Microchannel Heat Sink With Trefoil Shape Ribs, Sadiq Ali, Faraz Ahmad, Kareem Akhtar, Numan Habib, Muhammad Aamir, Khaled Giasin, Ana Vafadar, Danil Yurievich Pimenov
Research outputs 2014 to 2021
The present study investigates the thermo-hydraulic characteristics of a microchannel sink with novel trefoil Shaped ribs. The motivation for this form of rib shape is taken from the design of lung alveoli that exchange oxygen and carbon dioxide. This study has been conducted numerically by using a code from the commercially available Fluent software. The trefoil shaped ribs were mounted on the centerline of different walls of the microchannel in three different configurations. These consisted of base wall trefoil ribs (MC-BWTR), sidewall trefoil ribs (MC-SWTR), all wall trefoil ribs (MC-AWTR) and smooth channel (MC-SC) having no ribs on its wall. …
Improving Basalt Wettability To De-Risk Co2 Geo-Storage In Basaltic Formations, Stefan Iglauer, Ahmed Al-Yaseri
Improving Basalt Wettability To De-Risk Co2 Geo-Storage In Basaltic Formations, Stefan Iglauer, Ahmed Al-Yaseri
Research outputs 2014 to 2021
CO2 geo-storage in basaltic formations has recently been identified as a viable option to rapidly dispose large quantities of CO2, hence mitigating anthropogenic CO2 emissions. However, it has been shown that basalt is weakly water-wet or intermediate-wet at typical storage conditions, which reduces capillary trapping capacities and increases lateral and vertical spreading of the CO2 plume; and these effects increase project risk. We thus propose here to prime basalt surfaces with anionic surfactant (here we used sodium dodecyl benzene sulfonate), and demonstrate that such priming is highly efficient, and renders the basalt completely water-wet even …