Boiling And Evaporation On Micro/Nanoengineered Surfaces, 2013 University of South Carolina
Boiling And Evaporation On Micro/Nanoengineered Surfaces, Xianming Dai
Theses and Dissertations
Two-phase transport is widely used in energy conversion and storage, energy efficiency and thermal management. Surface roughness and interfacial wettability are two major impact factors for two-phase transport. Micro/nanostructures play important roles in varying the surface roughness and improving interfacial wettability. In this doctoral study, five types of micro/nanoengineered surfaces were developed to systematically study the impacts of interfacial wettability and flow structures on nucleate boiling and capillary evaporation. These surfaces include: 1) superhydrophilic atomic layer deposition (ALD) coatings; 2) partially hydrophobic and partially hydrophilic composite interfaces; 3) micromembrane-enhanced hybrid wicks; 4) superhydrophilic micromembrane-enhnaced hybrid wicks, and 5) functionalized carbon …
Experimental And Simulation Predicted Crack Paths For Al-2024-T351 Under Mixed-Mode I/Ii Fatigue Loading Using An Arcan Fixture, 2013 University of South Carolina - Columbia
Experimental And Simulation Predicted Crack Paths For Al-2024-T351 Under Mixed-Mode I/Ii Fatigue Loading Using An Arcan Fixture, Eileen Miller
Theses and Dissertations
Mixed mode I/II fatigue experiments and simulations are performed for an Arcan fixture and a 6.35mm thick Al-2024-T351 specimen. Experiments were performed for Arcan loading angles that gave rise to a range of Mode I/II crack tip conditions from 0 ¡Ü ¦¤KII/¦¤KI ¡Ü ¡Þ. Measurements include the crack paths, loading cycles and maximum and minimum loads for each loading angle. Simulations were performed using three-dimensional finite element analysis (3D-FEA) with 10-noded tetrahedral elements via CRACK3D. While modeling the entire fixture-specimen geometry, a modified version of VCCT with automatic crack tip re-meshing and a maximum normal stress criterion were used to …
Welding Parameters, Distortion And Mechanical Properties Of Aa7075 Lap Joints In Ssfsw, 2013 University of South Carolina
Welding Parameters, Distortion And Mechanical Properties Of Aa7075 Lap Joints In Ssfsw, Hejun Yu
Theses and Dissertations
Friction Stir Welding (FSW), first invented by The Welding Institute of UK (TWI) in 1991, is a solid state welding process which was initially applied to welding Aluminum Alloy. FSW has wide application in industrial sectors. Stationary shoulder friction stir welding (SSFSW) was first developed to weld low thermal conductivity Ti-based alloys, which are hard to weld using conventional friction stir welding. Previous literatures showed SSFSW can produce uniform temperature distribution through thickness during the welding process. Since SSFSW is still under study phase, its advantages and disadvantages are not yet well defined. It is important to study the characteristics …
Wave Propagation In Metamaterial Using Multiscale Resonators By Creating Local Anisotropy, 2013 University of South Carolina - Columbia
Wave Propagation In Metamaterial Using Multiscale Resonators By Creating Local Anisotropy, Raiz U. Ahmed, Sourav Banerjee
Faculty Publications
Directional guiding, passing or stopping of elastic waves through engineered materials have many applications to the engineering fields. Recently, such engineered composite materials received great attention by the broader research community. In elastic waves, the longitudinal and transverse motion of material particles are coupled, which exhibits richer physics and demands greater attention than electromagnetic waves and acoustic waves in fluids. Waves in periodic media exhibit the property of Bragg scattering and create frequency band gaps in which the energy propagation is prohibited. However, in addition to the Bragg scattering, it has been found that local resonance of artificially designed resonators …
Liposomal Uptake Of Silver And Gold Nanoparticles, 2013 Louisiana State University and Agricultural and Mechanical College
Liposomal Uptake Of Silver And Gold Nanoparticles, Dipon Chanda
LSU Master's Theses
The main objective of this work is to study the liposomal uptake of silver and old nanoparticles. Liposomes were prepared in Heating Method. The phospholipids used to prepare liposomes are 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (16:0 PC); 1,2-dipalmitoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (16:0 PG); 1,2-distearoyl-sn-glycero-3-phosphocholine (18:0 PC); 1,2-distearoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (sodium salt) (18:0 PG).Four different combinations of phospholipids were used to prepare liposomes. In all four combinations two types of phospholipids were used. The liposomes were incubated for 30 minute, 1 hour, 2 hour and 4 hour with silver and gold nanoparticles in streptavidin coated glass slide. All four liposomal formulations had a biotinylated lipid (1-oleoyl-2-[12-biotinyl(aminododecanoyl)]-sn-glycero-3-phosphocholine) which has a string …
Mechanical Characterization Of Composite Repairs For Fiber-Glass Wind Turbine Blades, 2013 University of North Dakota
Mechanical Characterization Of Composite Repairs For Fiber-Glass Wind Turbine Blades, Tanveer Singh Chawla
Theses and Dissertations
While in service, wind turbine blades experience various modes of loading. An example is impact loading in the form of hail or bird strikes, which might lead to localized damage or formation of cracks a few plies deep on the blade surface. One of the methods to conduct repairs on wind turbine blades that are damaged while in service is hand lay-up of the repair part after grinding out the damaged portion and some of its surrounding area. The resin used for such repairs usually differs from the parent plate resin in composition and properties such as gel time, viscosity, …
Electric Field Influence On The Combustion Of Fuel Droplets, 2013 Louisiana State University and Agricultural and Mechanical College
Electric Field Influence On The Combustion Of Fuel Droplets, Solomon Benghan
LSU Master's Theses
Improving the combustion efficiency of fuels in combustion devices has become imperative in the face of the diminishing rate of the discovery of new energy sources and an ever increasing demand for energy. While there are other ways of improving combustion efficiency, this study investigated the effect of electric field on the combustion of fuel droplets. In order to model the physics of the problem, a mass transfer evaporation model, heat transfer evaporation model and a simple burning droplet model were considered and their result compared to existing result from literature. A burning rate constant of 1.380mm2/s, 14.910mm2/s and 0.612mm2/s …
Analysis And Optimization Of Film Cooling Effectiveness, 2013 Louisiana State University and Agricultural and Mechanical College
Analysis And Optimization Of Film Cooling Effectiveness, Hessam Babaee
LSU Doctoral Dissertations
In the first part, an optimization strategy is described that combines high-fidelity simu- lations with response surface construction, and is applied to pulsed film cooling for turbine blades. The response surface is constructed for the film cooling effectiveness as a function of duty cycle, in the range of DC between 0.05 and 1, and pulsation frequency St in the range of 0.2-2, using a pseudo-spectral projection method. The jet is fully modulated and the blowing ratio, when the jet is on, is 1.5 in all cases. Overall 73 direct numerical sim- ulations (DNS) using spectral element method were performed to …
A Polymer-Based Microfluidic Device With Electrolyte-Enabled Distributed Transducers (Eedt) For Distributed Load Detection, 2013 Old Dominion University
A Polymer-Based Microfluidic Device With Electrolyte-Enabled Distributed Transducers (Eedt) For Distributed Load Detection, Peng Cheng
Mechanical & Aerospace Engineering Theses & Dissertations
The capability of detecting distributed static and dynamic loads is indispensable in a wide variety of applications, such as examining anatomical structures of biological tissues in tissue health analysis and minimally invasive surgery (MIS) and determining the texture of an object in robotics. This dissertation presents a comprehensive study of a polymer-based microfluidic device with electrolyte-enabled distributed transducers and demonstrates a new concept on using a single microfluidic device for distributed-load detection, which takes advantage of the low-cost microfluidic fabrication technology and the low modulus and biocompatibility of polymer. The core of the device is a single deformable polymer microstructure …
Performance Investigation Of A Hybrid Renewable Power Generation And Storage System Using Systemic Power Management Models, 2012 Chemical and Process Engineering Research Institute,Center for Research and Technology Hellas
Performance Investigation Of A Hybrid Renewable Power Generation And Storage System Using Systemic Power Management Models, Damianos Giaouris, Athanasios Papadopoulos, Chrysa Ziogou, Dimiptris Ipsakis, Spyors Voutetakis, Simira Papadopoulou, Panos Seferlis, Fotis Stergiopoulos, Costas Elmasides
Sakis Papadopoulos
Hybrid renewable power generation systems considering storage of energy and/or hydrogen involve considerable complexity as heterogeneous equipment need to be interconnected and activated or deactivated at different time instances. This work employs generic and flexible decision making models to develop complex power/hydrogen management strategies and investigate their performance on systems integrating multiple power generation and storage devices. These models significantly facilitate the analysis of both a standalone power generation and storage system forming a microgrid currently in operation as well as three interconnected microgrids of different functionalities considered in this work. These systems are used to investigate the performance of …
Laminar Natural Convection From Isothermal Vertical Cylinders: Revisiting A Classical Subject, 2012 Selected Works
Laminar Natural Convection From Isothermal Vertical Cylinders: Revisiting A Classical Subject, Jerod Day, Matthew Zemler, Matthew Traum, Sandra Boetcher
Sandra Boetcher
No abstract provided.
Direct Methanol Fuel Cells For Increased Energy Capacity In Laptops And Other Mobile Electronics, 2012 University of Texas at Tyler
Direct Methanol Fuel Cells For Increased Energy Capacity In Laptops And Other Mobile Electronics, W.E. Lear Jr., O.D. Crisalle, S.P. Mudiraj, Mohammad Biswas
Mohammad Biswas
Higher Order Energy Balance Method For A Series Of Nonlinear Oscillatory Systems, 2012 Iran University of Science and Technology Tehran
Higher Order Energy Balance Method For A Series Of Nonlinear Oscillatory Systems, Hassan Askari
Hassan Askari
No abstract provided.
Hydrogen And Synthesis Gas Production From Activated Carbon And Steam Via Reusing Carbon Dioxide, 2012 National Cheng Kung University
Hydrogen And Synthesis Gas Production From Activated Carbon And Steam Via Reusing Carbon Dioxide, Wei-Hsin Chen
Wei-Hsin Chen
No abstract provided.
Influences Of Geometry And Flow Pattern On Hydrogen Separation In A Pd-Based Membrane Tube, 2012 National Cheng Kung University
Influences Of Geometry And Flow Pattern On Hydrogen Separation In A Pd-Based Membrane Tube, Wei-Hsin Chen
Wei-Hsin Chen
No abstract provided.
The Wear Behavior Of Cross-Linked Uhmwpe Under Dry And Bovine Calf Serum-Lubricated Conditions, 2012 Selected Works
The Wear Behavior Of Cross-Linked Uhmwpe Under Dry And Bovine Calf Serum-Lubricated Conditions
A.S. Md Abdul Haseeb
The present study was performed to investigate the effects of gamma radiation on the wear behavior of unirradiated and irradiated ultra-high-molecular-weight polyethylene (UHMWPE) against Ti-6Al-4V under dry and lubricated conditions at different applied loads. The UHMWPE specimens were exposed directly to nominal doses of 0, 25, 40, 50, and 100 kGy. Scanning electron microscope (SEM) analysis of the worn surface of UHMWPE and Ti-6Al-4V was performed to understand the mechanism of wear involved between the contact surfaces during wear testing. From the wear test results, there were significant differences between the wear of unirradiated UHMWPE and UHMWPE irradiated at 25, …
Determination Of Kinetic Parameters From The Thermogravimetric Data Set Of Biomass Samples, 2012 Wroclaw University of Technology
Determination Of Kinetic Parameters From The Thermogravimetric Data Set Of Biomass Samples, Karol Postawa, Wojciech M. Budzianowski
Wojciech Budzianowski
This article describes methods of the determination of kinetic parameters from the thermogravimetric data set of biomass samples. It presents the methodology of the research, description of the needed equipment, and the method of analysis of thermogravimetric data. It describes both methodology of obtaining quantitative data such as kinetic parameters as well as of obtaining qualitative data like the composition of biomass. The study is focused mainly on plant biomass because it is easy in harvesting and preparation. Methodology is shown on the sample containing corn stover which is subsequently pyrolysed. The investigated sample show the kinetic of first order …
Temperature-Dependent Absorption Cross-Section Measurements Of 1-Butene (1-C4h8) In Vuv And Ir, 2012 Paul Scherrer Institute (PSI)
Temperature-Dependent Absorption Cross-Section Measurements Of 1-Butene (1-C4h8) In Vuv And Ir, Et-Touhami Es-Sebbar, Yves Benilan, Aamir Farooq
Dr. Et-touhami Es-sebbar
Vacuum ultraviolet (VUV) and infrared (IR) absorption cross-section measurements of 1-butene (1-C4H8; CH2=CHCH2CH3; Butylene) are reported over the temperature range of 296–529 K. The VUV measurements are performed between 115 and 205 nm using synchrotron radiation as a tunable VUV light source. Fourier Transform Infrared (FTIR) spectroscopy is employed to measure absorption cross-section and band strengths in the IR region between 1.54 and 25 μm (∼6500–400 cm−1). The measured room-temperature VUV and IR absorption cross-sections are compared with available literature data and are found to be in good agreement. The oscillator strength for the electronic transition (A1A′→X1A′) around 150–205 nm …
Variational Iteration Method For Nonlinear Oscillators: A Comment On “Application Of Laplace Iteration Method To Study Of Nonlinear Vibration Of Laminated Composite Plates”, 2012 Shiraz University of Technology
Variational Iteration Method For Nonlinear Oscillators: A Comment On “Application Of Laplace Iteration Method To Study Of Nonlinear Vibration Of Laminated Composite Plates”, Habibolla Latifizadeh
H. L. Zadeh
No abstract provided.
Separation Control On High Lift Low-Pressure Turbine Airfoils Using Pulsed Vortex Generator Jets, 2012 U.S. Naval Academy
Separation Control On High Lift Low-Pressure Turbine Airfoils Using Pulsed Vortex Generator Jets, Ralph J. Volino, Mounir B. Ibrahim
Mechanical Engineering Faculty Publications
Boundary layer separation control has been studied using vortex generator jets (VGJs) on a very high lift, low-pressure turbine airfoil. Experiments were done under low (0.6%) freestream turbulence conditions on a linear cascade in a low speed wind tunnel. Pressure surveys on the airfoil surface and downstream total pressure loss surveys were documented. Instantaneous velocity profile measurements were acquired in the suction surface boundary layer. Cases were considered at Reynolds numbers (based on the suction surface length and the nominal exit velocity from the cascade) of 25000 and 50000. Jet pulsing frequency and duty cycle were varied. In cases without …