Engineering Commons^™

Direct Numerical Simulation Of Reactive Flow Through A Fixed Bed Of Catalyst Particles, Abdelkader Hammouti, Florian Euzenat, Daniel Rakotonirina, Anthony Wachs

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Many catalytic refining and petrochemical processes involve two-phase reactive systems in which the continuous phase is a fluid and the porous phase consists of rigid particles randomly stacked. Improving both the design and the operating conditions of these processes represents a major scientific and industrial challenge in a context of sustainable development. Thus, it is above all important to better understand all the intricate couplings at stake in these flows: hydrodynamic, chemical and thermal contributions. The objective of our work is to build up a multi-scale modelling approach of reactive particulate flows and at first to focus on the development …

An Innovative Culture Technique For Microalgae Using Hollow Fiber Membranes, Yoshihiko Sano, Takeshi Suzuki, Akira Nakayama

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

A hollow fiber culture system has been proposed for supplying the carbon dioxide to the microalgae, to replace the conventional air bubbling system which has been adopted to supply carbon dioxide in most conventional microalgal culture. In order to examine the usefulness of hollow fiber membranes for the microalgal culture, the microalgal growth rate for Chlorella sp. and the effective mass transfer coefficient of carbon dioxide through the hollow fiber membranes have been measured using the proposed photobioreactor filled with hollow fibers. The microalgal growth rate using hollow fiber membranes was found to be three times greater than that observed …

Active Nanomaterials For Biomedical Applications, Gianni Ciofani

Nanotechnology in Medicine: From Molecules to Humans

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Wavefront Sensor, Richard Mulé

Electrical and Computer Engineering Senior Theses

Wavefront reconstruction techniques have enabled important scientific improvements to corrective imaging in astronomy, optometry, and elsewhere. Here, we describe the design of a wavefront reconstruction-based adaptive optics system designed at Santa Clara University (SCU) in the Department of Physics. Our compact system is based on a modified Shack-Hartmann sensor design and can detect wavefront disturbances on the order of tens of nanometers. The full SCU system includes a 635 nm laser, a collimating lens pair, two mirrors, a microlens array, and a commercial CCD camera. The CCD data is analyzed using a least-squares reconstruction algorithm. Here, we present preliminary wavefront …

Numerical Investigation Of The Phase Change In Transpiration Cooling With The Vof Method, Xiao-Long Ouyang, Pei-Xue Jiang

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Transpiration cooling with phase change is numerically investigated in the present work. As shown in Figure 1, a liquid coolant flow is injected into a porous medium from the bottom side. The porous medium receives heat from the hot gas on the top surface and heats the coolant. Thus, phase change can occur in this porous medium. The surface temperature, the heat flux received by the porous medium, the phase distribution and the flow and cooling characteristics are the most important unknowns on this topic.

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Modeling Flow, Heat And Mass Transfer In A Porous Biomass Plug - When Used In An Electrically Heated Tobacco System, Markus Nordlund, Arkadiusz K. Kuczaj

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Heating porous biomass samples is utilized in many industries for drying or extracting Volatile Organic Compounds (VOC) from the biomass. The heating may trigger physical and chemical processes within the material, such as release of VOC, thermal degradation and evaporation. Most of the processes triggered by the increased temperature are occurring simultaneously and are strongly interdependent. For most practical applications, it is important to have control of the complex processes occurring during heating to generate stable and controllable release of VOC. This is the case for products delivering the released VOC to consumers by inhalation, as is the case of …

Synthesis Of Nanoporous Carbohydrate Metal-Organic Framework And Encapsulation Of Acetaldehyde, Saleh Al-Ghamdi, Ajay Kathuria, Mohamad G. Abiad, Rafael Auras

Industrial Technology and Packaging

Gamma cyclodextrin (γ-CD) metal organic frameworks (CDMOFs) were synthesized by coordinating γ-CDs with potassium hydroxide (KOH), referred hereafter as CDMOF-a, and potassium benzoate (C₇H₅KO₂), denoted as CDMOF-b. The obtained CDMOF structures were characterized using nitrogen sorption isotherm, thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). High surface areas were achieved by the γ-CD based MOF structures where the Langmuir specific surface areas (SSA) of CDMOF-a and CDMOF-b were determined as 1376 m² g⁻¹ and 607 m² g⁻¹; respectively. The dehydrated CDMOF structures demonstrated good thermal stability …

A Mini-Review On The Fractal-Monte Carlo Method And Its Applications In Porous Media, Boming Yu

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Porous media widely exist in nature such as soil, rocks, sandstones, oil/gas//water reservoirs, biological tissue and organics, etc., and in many sciences and engineering applications. Since microstructures of porous media are extremely complicated, this makes very difficult to predict the transport properties such as thermal conductivities and permeabilities of porous media by analytical solutions. Usually, numerical simulations such as control volume method, molecular dynamics and Lattice Boltzmann method etc. are often applied. However, results by numerical simulations are often correlated as empiric expressions, which usually contain one or more empiric constants.

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Wake Character In The Wind Turbine Array: (Dis-)Organization, Spatial And Dynamic Evolution And Low-Dimensional Modeling, Nicholas Michael Hamilton

Dissertations and Theses

To maximize the effectiveness of the rapidly increasing capacity of installed wind energy resources, new models must be developed that are capable of more nuanced control of each wind turbine so that each device is more responsive to inflow events. Models used to plan wind turbine arrays and control behavior of devices within the farm currently make questionable estimates of the incoming atmospheric flow and update turbine configurations infrequently. As a result, wind turbines often operate at diminished capacities, especially in arrays where wind turbine wakes interact and inflow conditions are far from ideal. New turbine control and wake prediction …

Review Of Sustainable Energy -- Without The Hot Air By David Mackay (2009), Kira Hamman

Numeracy

David MacKay. Sustainable Energy: Without the hot air. (Cambridge, England: UIT Cambridge Ltd., 2009). 384 pp. ISBN 978-0954452933 (also available as a free e-book).

Physicist David MacKay transforms what has historically been a debate fraught with skepticism and hysteria into an informed conversation. He does this by providing clear, accurate quantitative information on energy production and consumption in a form that allows comparison and invites thoughtful analysis. By recalibrating power into kilowatt-hours per day per person, he makes the numbers meaningful on an individual level. He then meticulously estimates the productive capacity of various renewable energy sources, explores alternative …

Generation Of Simple Extended Porous Surface Expression From Results Of Pore-Level Conjugate Heat Transfer In Spherical-Void-Phase Porous Blocks, Anthony G. Straatman, Alex Kalopsis, Nolan Dyck

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Studies of convection in porous media continue to be of scientific interest due to the increasing utility of highly-conductive porous materials in heat exchange applications. Of central interest is the ability to model flow and heat transfer through a porous material with high accuracy in a manner that is computationally inexpensive. To this end, use of thermal-equilibrium (TE) or non-thermal-equilibrium (NTE) volume–averaged techniques are of great interest, but use of such methods requires information that is averaged out to be supplied as model coefficients for simple constitutive models that characterize the physical processes. Such models and coefficients are typically derived …

Effects On The Pore Structure And Permeability Change By Coke Deposition During Crude Oil In-Situ Combustion, Qianghui Xu, Bin Ma, Hang Jiang, Ran Xu, Chao Huang, Lin Shi

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

In-situ combustion(ISC) is an enhanced oil recovery technique to exploit the unconventional crude oil resources with high recovery efficiency. Great amount of reaction heat is released in-place by burning the solid residue, so-called coke at the combustion front with the temperature higher than 400℃. Significant open ISC questions include the effect of coke formation on the pore structure and permeability. Coke deposition reduces the permeability and increases the permeability heterogeneities which will affect the oxygen transport in the formation, thereby influencing the oxygen participating reactions downstream. However, the existing empirical or semi-empirical relationships are still questionable to model the permeability …

Experiments Of Water's Effect On Mechanical Properties Of Shale Rocks, Fuquan Song, Fuying Qi

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

The multiple hydraulic fracturing is an indispensable means to improve the production mass of natural gas in development of shale gas. The fracturing water consumption of a horizontal well reaches 10x103 m3. However, the water been injected into shale layer is not reverse discharged completely. How does this part of water stays in shale layer? What's the role it plays? And how does it have any effects on the development? We studied effects of water on shale rock mechanical properties experimentally to answer these questions.

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Numerical Simulation Of Thermal Energy Storage With Phase Change Material And Aluminum Foam, Bernardo Buonomo, Oronzio Manca, Davide Ercole, Sergio Nardini

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

A Latent Heat thermal energy storage system (LHTESS) is employed as a thermal buffer, since it avoids the intermittent supply of thermal energy due to the behaviour of the thermal source, in particular the renewable thermal source like the solar radiation. Therefore a LHTESS allows supplying the thermal energy in continuous way. The principal material of a LHTESS is the phase change material (PCM) given that it storages a high quantity of thermal energy during its phase change process thanks to the high value of latent heat. Moreover the thermal energy is stored at quasi-constant temperature because during the phase …

Effect Of The Variable Porosity On The Heat Transfer Process In Solar Air Receiver, Pei Wang, D. Y. Liu

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Solar air receiver is the core component of central receiver system (CRS) in solar thermal power plants due to the unique feature of some porous medium like silicon carbide foam ceramic and so on. In the air receiver, the porous material receives the concentrated sunlight from the heliostat field and heats up the pumped inlet air by convection and radiation. The incident radiation is distributed in the inner space of the porous medium rather than located on the boundary of the heated face in the front of the receiver. Aiming at this phenomenon which called volumetric effect, we propose a …

Cuny Summer Stem Institute: Experimental Research In Engineering For High School Students, Maribel Vazquez

Open Educational Resources

Summer HS students were engaged in hands-on experimental research in engineering laboratories in mentorship with CCNY Engineering Undergraduate Researchers. This course was part of the Summer STEM Institute directed by Dr. Joe Barba and Mr. Otto Marte.

Physicochemical And Functional Properties Of Extruded Sorghum‐Based Bean Analog, Akinbode A. Adedeji, Michael V. Joseph, Brian Platter, Sajid Alavi

Biosystems and Agricultural Engineering Faculty Publications

The objective of this study was to develop and evaluate the physicochemical and functional properties of a bean like product made from cold extrusion of sorghum, soy and wheat flours. Formulated samples comprised of sorghum (25–70%), wheat (0–35%) and soy (30–50%) flours. The degree of gelatinization ranged from 54.1 to 93.6%. Pasting curves showed minimal starch damage with peak and final viscosities in the range of 456.0–1138.5 and 297–584 cP, respectively. Textural properties of the extrudates were significantly impacted by starch content and cooking time. There was significant cooking loss due to poor binding properties of the extrudates. Cooking the …

Proposal Of Utilizing Uni-Directional Porous Copper For Extremely High Heat Flux Removal, Kazuhisa Yuki, Kio Takai, Yoshiki Indou, Koichi Suzuki

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

This paper proposes new heat removal devices utilizing uni-directional porous copper against extremely high heat flux conditions. Before designing those, we discuss some key parameters of porous media to enable a high heat flux removal over 10 MW/m² at a low flow rate of water, which are effective thermal conductivity, permeability, liquid supply to a heat transfer surface, and contact thermal resistance between the porous medium and the heat transfer surface. These discussions indicate utilizing the uni-directional porous media as shown in Fig. 1 from the view point of its higher thermal conductivity, direct supply of cooling liquid toward …

Fractional Transport Models For Shale Gas In Tight Porous Media, Nadeem A. Malik, Iftikhar Ali

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Modelling the flow of fluid through tight porous media, such as unconventional hydrocarbon reservoirs, is very challenging and it is a growing sector and must be addressed. Shale gas is found in such tight porous rocks which are characterized by nano-scale size porous networks with ultra-low permeability [1,2].

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Impact Of Engineered Nanoparticles In Initiating Or Modulating Pathology-Related Inflammation, Diana Boraschi, Yang Li, Emanuele Scala, Victor F. Puntes, Paola Italiani

Nanotechnology in Medicine: From Molecules to Humans

The possibility that nanomaterials could perturb the normal course of an inflammatory response is a key issue when assessing nano-immunosafety. The alteration of the normal progress of an inflammatory response may have pathological consequences, since inflammation is a major defensive mechanism and its efficiency maintains the body’s health. We can thus consider as pathology-related inflammation those inflammatory reactions that, instead of eliminating foreign agents, lack down-regulation and cause tissue damage. To assess the ability of nanoparticles to initiate and modulate inflammatory reactions, an in vitro model was used that recapitulates all the stages of infection-induced inflammation, from initiation to resolution, …

An Experimental Investigation On Effect Of Pores Per Inch In Compact Heat Exchanger With Aluminum Foam, Oronzio Manca, Bernardo Buonomo, Luca Cirillo, Sergio Nardini

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Metal foams are a new class of materials with low densities and novel thermal and mechanical properties. Aluminum foams combine low weight with good rigidity, strength, damping of vibrations and noise, shock resistance and low thermal conductivity [1]. An experimental investigation on a single row of aluminum tubes, covered with layers of aluminum foams, was carried out by T’joen et al. [2]. A range of foam layer thickness, Reynolds number tube spacing and different type of foam were considered and compared with compact helically finned tube heat exchangers. An experimental investigation was carried out by Sertkaya et al. [3] to …

Dango (Doings And Goings On) - Vol. 22 | Issue 7, Matthew Kimball, Haley Stien, Aric Tate, Vicente Rojas, Zhaojia Xi, Caleb Hicks, Paul Carstens, Joshua Daniel Martinez, Mike Daugherity, Reuben Byrd, Donald Isenhower

DANGO: Doings and Goings On: Summer Research Newsletter, Department of Engineering and Physics

Summer Research Newsletter for ACU's Engineering and Physics Department

Mechanotransduction Of Matrix Stiffness Regulates Cell Adhesion Strength: An Analysis Using Biomaterial Surfaces With Tunable Mechanical And Chemical Properties, Asma Sharfeddin Sharfeddin

USF Tampa Graduate Theses and Dissertations

Cells have the ability to sense the rigidity of the extracellular matrix which directly affects the control of cellular functions in development, wound healing and malignant transformation. Polydimethylsiloxane elastomers are useful model biomaterials for mechanotransduction studies because they possess several advantages including ease of fabrication, tunable elasticity and modifiable surface chemistry. In this work, we are investigating the influence of matrix stiffness on adhesion strength and the mechanosensory structures that regulate these processes. In addition, the effect of surface modifications to this elastic substrate system on other physical properties such as local stiffness and topography will be analyzed. Based on …

Combined Effects Of Internal Heat Generation And Viscous Dissipation For Double Diffusive With Forchheimer Fluid Model, Dinesh P.A., Rushi Kumar B., Suresh Babu R

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

In this paper, a numerical study using shooting technique is applied for a double diffusive flow for the combined effects of internal heat generation and viscous dissipation over a vertical heated plate under the influence of variable fluid properties is carried out. The governing equations of the physical problem are non-linear and coupled partial differential equations for velocity, temperature and concentration distributions. Using a suitable similarity transformation, the governing equations are transformed to ordinary differential equations involving the various non-dimensional parameters of the problem.

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Internal Heat Generation Effect On Mixed Convection Heat And Mass Transfer Over A Vertical Heated Plate With Soret And Dufour Effects, Dinesh P.A., Nalinakshi N., Chandrashekhar D. V.

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

Study and analysis of internal heat generation effect of two-dimensional, steady, laminar, heat and mass transfer mixed convection flow of a viscous incompressible fluid from a vertical heated plate embedded in a sparsely packed porous medium with variable fluid properties such as permeability, porosity, thermal conductivity and solutal diffusivity with the Soret and Dufour effects are considered and studied numerically. The boundary layer flow in the porous medium is governed by Lapwood-Forcheimer-Brinkman extended Darcy model.

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Gas Hydrate Inhibition And Its Unique Thermodynamic Behaviors Within The Porous Clay Sediment, Yun-Ho Ahn, Huen Lee

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

The fundamental understanding of gas and water system in geological sediments is necessary for greenhouse gas sequestration and future energy production. Depending on the surrounding environments that water, gas, and other substrate material coexist, several unique phases such as supercritical, dissolved gas, gas oversatu-rated, and hydrate could be formed. Especially, gas hydrates which are composed of water frameworks and several gaseous guest molecules have drawn people’s attention for its application such as methane production with carbon dioxide sequestration. For these reasons, to produce methane from natural gas hydrate and store carbon dioxide by replacement reaction, the thermodynamic behaviors of gas …

Modeling Atypical Building Use With Commercially Available Building Simulation Software, Sarah E. Schanck

Theses and Dissertations

National Guard armories are audited to provide recommendations for future energy reduction measures. The annual energy consumption of a New Jersey National Guard Armories cannot be modeled directly with commercially available building simulation software, due to discrepancies between the modeling capabilities of the software and the reality of the armory. A building simulation software, eQUEST, was chosen for use in this project. Discrepancies between eQUEST inputs and reality were identified and correction factors developed to minimize the effect of each discrepancy on predicted energy consumption, with the end goal of accuracy between predicted and actual energy consumption. In addition, an …

Monolayer Mos2 Bandgap Modulation By Dielectric Environments And Tunable Bandgap Transistors, Junga Ryou, Yong-Sung Kim, Santosh Kc, Kyeongjae Cho

Faculty Publications

Semiconductors with a moderate bandgap have enabled modern electronic device technology, and the current scaling trends down to nanometer scale have introduced two-dimensional (2D) semiconductors. The bandgap of a semiconductor has been an intrinsic property independent of the environments and determined fundamental semiconductor device characteristics. In contrast to bulk semiconductors, we demonstrate that an atomically thin two-dimensional semiconductor has a bandgap with strong dependence on dielectric environments. Specifically, monolayer MoS2 bandgap is shown to change from 2.8 eV to 1.9 eV by dielectric environment. Utilizing the bandgap modulation property, a tunable bandgap transistor, which can be in general made of …

College Of Engineering News, Georgia Southern University

College of Engineering & Computing: News & Publications (2010-2023)

• Project Lead The Way (PLTW) 2016

Exact Solution For Viscous Fluid Flow In Porous Medium With Magnetic Field, Dinesh P. A., Jayalakshmamma D.V., Chandrashekhar D.V.

Sixth International Conference on Porous Media and Its Applications in Science, Engineering and Industry

The steady flow of viscous, incompressible, conducting fluid flow past a spherical solid core embedded in another spherical porous medium is considered. The exact solution is obtained for the flow in the presence of transverse magnetic field. The considered fluid flow is governed by Brinkman equation in porous region and by Stokes equation in the fluid region with additional Lorentz’s force due to applied magnetic field. The flows in the two regions are matched across the interface by assuming continuity of velocity and stress across the interface. Further, no-slip condition at the solid surface and uniform velocity far from the …