Engineering Commons^™

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 …

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 …

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 …

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.

Please download the full abstract below.

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.

Please download the full abstract below.

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 …

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.

Please download the full abstract below.

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 …

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 …

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].

Please download the full abstract below.

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 …

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 …

College Of Engineering News, Georgia Southern University

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

• Project Lead The Way (PLTW) 2016

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 …

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 …

Stokes Flow Past A Two-Layers Heterogeneous Porous Sphere With The Effect Of Stress Jump Condition: An Exact Solution, Kun Yang, Xin Yan, Kambiz Vafai

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

The flow past a porous sphere has extensive industrial and engineering applications, such as the flow of pulverized coals particulate during combustion, sedimentation of fine particulate suspensions, flow in porous beds etc. Several studies have been done about the flow past a porous body under different models and boundary conditions. The models used in their investigations can be divided into the following categories: (i) Adopting Darcy equation to describe the flow in porous media and Stokes equations to describe the flow in the free fluid with the continuity conditions of velocity and pressure at the interface or the Beavers-Joseph (BJ) …

Experimental Research On Internal Convection Heat Transfer Of Supercritical Pressure Co2 In Porous Media, Le Zhang, Pei-Xue Jiang, Rui-Na Xu, Zhen-Chuan Wang

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

The flow and heat transfer of fluids at supercritical pressure in porous media has attracted much attention due to its extensive applications, such as supercritical water-cooled nuclear reactor, CO₂ gas cooled reactor, transpiration cooling and supercritical CO₂ solar thermal power generation system. There are mainly two theories to describe convection heat transfer in porous media, i.e., the local thermal equilibrium model (LTE) and the local thermal non-equilibrium model (LTNE). Compared with LTE model, the LTNE model is a more detailed model that uses two energy equations to describe heat transport in the solid and fluid. The internal heat …

The Influence Of Cold Rolling On The Pore Morphology And Flow Resistivity Of Porous Aluminum, Nicolas Lippitz, Samir Maudarbocus, Joachim Rösler

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

Materials with an open porosity are used in many applications, such as filters, acoustic absorbers or heat exchangers. For these applications the pore size and shape as well as the depending flow resistivity are important parameters and need to be adjusted for the specific case. The material parameters are usually defined by the manufacturing process and are therefore signature for different types of porous materials. In this study the porosity, pore shape and the depending flow resistivity of a given material are adjusted using a cold rolling process. The material chosen is a porous aluminum with a porosity of about …

Flow Of Shale Gas In Tight Rocks Using A Non-Linear Transport Model With Pressure Dependent Model Parameters, Nadeem A. Malik, Iftikhar Ali, Bilal Chanane, Ryad A. Ghanam

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

A new source of energy has recently been discovered from unconventional hydrocarbon reservoirs, such as shale gas deposits. Shale gas is found in tight porous rocks which are characterised by nano-scale size porous networks with ultra-low permeability [1,2]. The modelling of transport through such tight porous media is very challenging because it is a relatively new discipline and not much is known but transport processes in them, and little data is available; but it is a growing sector and must be addressed. Here, we apply a recently developed non-linear gas transport model [3], to reservoir simulations of single-phase gas through …

Quantifying The Effects Of Humidity On Density Altitude Calculations For Professional Aviation Education, Thomas A. Guinn, Randell J. Barry

International Journal of Aviation, Aeronautics, and Aerospace

The effects of humidity on density altitude are quantified in detail and graphically represented as a function of temperature and dew-point temperature for ease of use in professional aviation education. A ten-year climatology of dew-point temperatures for various representative locations throughout the United States is created to provide a basis for comparison and use with the graphical displays. Density altitude is demonstrated to be a function only of dew-point temperature for a given pressure altitude. The absolute errors between density altitude calculations that incorporate humidity to those that do not are combined with linear regression techniques to create a simple …

Nanotechnology Applications In Medical Diagnosis, Imaging, And Therapy, Mansoor M. Amiji

Nanotechnology in Medicine: From Molecules to Humans

Tremendous advances in molecular and personalized medicine also present challenges for translation of innovative experimental approaches into clinically relevant strategies. To overcome some of these challenges, nanotechnology offers interesting solutions for disease prevention, diagnosis, and treatment. For many systemic diseases, overcoming biological barriers and target specific delivery are the key challenges. Additionally, newer generation of molecular therapies, such as gene therapy, oligonucleotides, and RNA interference (RNAi) require robust and highly specific intracellular delivery strategies for effective and clinically meaningful therapeutic outcomes.

In this presentation, I will cover several of our approaches for development of multifunctional engineered nano-systems for targeted therapies …

A Model Of Human Harm From A Falling Unmanned Aircraft: Implications For Uas Regulation, Andrew V. Shelley

International Journal of Aviation, Aeronautics, and Aerospace

This paper quantifies the human harm, in the form of fatalities and skull fractures, which could occur as a result of an unmanned aircraft falling from a height. The analysis is used to establish the maximum height at which an unmanned aircraft can be flown over people to achieve a level of safety consistent with the rate of ground fatalities from General Aviation. The maximum height is dependent on the aircraft mass and the population density of people on the ground below.

The results are used to inform a critical evaluation of recent recommendations from the FAA-chartered “Unmanned Aircraft Systems …