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A Numerical And Experimental Study Of The Effects Of Dynamic Roughness On Laminar Leading Edge Separation, Peter D. Gall
A Numerical And Experimental Study Of The Effects Of Dynamic Roughness On Laminar Leading Edge Separation, Peter D. Gall
Graduate Theses, Dissertations, and Problem Reports
The aircraft industry, as a whole, has been deeply concerned with improving the aerodynamic efficiency of current and future flight vehicles, particularly in the commercial and military markets. However, of particular interest to the field of aerodynamics is the elusive concept of a workable flow control mechanism. Effective flow control is a concept which if properly applied can increase aerodynamic efficiency. Various concepts and ideas to obtain successful flow control have been studied in an attempt to reap these rewards. Some examples include boundary layer blowing (steady and periodic), suction, and compliant walls for laminar flow control. The overall goal …
Electro-Active Liquid Crystal Dispersed Composites, Sarah E. Smith
Electro-Active Liquid Crystal Dispersed Composites, Sarah E. Smith
Graduate Theses, Dissertations, and Problem Reports
In this thesis, the movement of anisotropic liquid crystal polymer rods in dispersion fluids of silicon oils was investigated. The rods demonstrated movement by an applied external AC field. The polymer rods used were 200 nm in diameter and 60 mum in length produced using the template synthesis technique originally adopted by Shafran (2008). A reactive liquid crystal monomer was polymerized by ultraviolet light while the liquid crystal remained in the nematic temperature range. This curing permanently fixes the liquid crystal molecules, producing polymer rods independent of temperature. The rods were dispersed in silicon oils of viscosities 4.7, 9.2, and …
Verification Of A Level-3 Diesel Emissions Control Strategy For Transport Refrigeration Units, Umesh Shewalla
Verification Of A Level-3 Diesel Emissions Control Strategy For Transport Refrigeration Units, Umesh Shewalla
Graduate Theses, Dissertations, and Problem Reports
Transport Refrigeration Units (TRUs) are refrigeration systems used to control the environment of temperature sensitive products while they are being transported from one place to another in trucks, trailers or shipping containers. The TRUs typically use an internal combustion engine to power the compressor of the refrigeration unit. In the United States TRUs are most commonly powered by diesel engines which vary from 9 to 40 horsepower. TRUs are capable of both heating and cooling. The TRU engines are relatively small, inexpensive and do not use emissions reduction techniques such as exhaust gas recirculation (EGR). A significant number of these …
Spray Cooling Simulation Implementing Time Scale Analysis And The Monte Carlo Method, Paul Joseph Kreitzer
Spray Cooling Simulation Implementing Time Scale Analysis And The Monte Carlo Method, Paul Joseph Kreitzer
Graduate Theses, Dissertations, and Problem Reports
Spray cooling research is advancing the field of heat transfer and heat rejection in high power electronics. Smaller and more capable electronics packages are producing higher amounts of waste heat, along with smaller external surface areas, and the use of active cooling is becoming a necessity. Spray cooling has shown extremely high levels of heat rejection, of up to 1000 W/cm 2 using water.;Simulations of spray cooling are becoming more realistic, but this comes at a price. A previous researcher has used CFD to successfully model a single 3D droplet impact into a liquid film using the level set method. …
Conceptual And Preliminary Design Of A Stowable Ruggedized Micro Air Vehicle, Shanti D. Hamburg
Conceptual And Preliminary Design Of A Stowable Ruggedized Micro Air Vehicle, Shanti D. Hamburg
Graduate Theses, Dissertations, and Problem Reports
This study presents both feasibility and preliminary design studies of a ruggedized, stowable, ballistically launched Micro Air Vehicle (MAV). A vehicle capable of being stored within a 40 mm diameter, 133 mm long cylinder and able to withstand a significantly rough environment when stowed was desired. Minimum performance specifications were a 20% range increase from a 450 m range, 45° launch angle ballistic trajectory and a gliding time of 30 s from the apex of said trajectory. To this end, a study of comparable MAV systems, available control and communication electronics, low Reynolds number flight, ballistic flight, and advanced projectiles …
Gas-Solid Interaction, Flow Behavior Analysis And Development Of A Design Basis Equation For The Dense Entry Region Of An Asymmetrically Loaded Cold Flow Cfb Riser, Rajiv Dastane
Graduate Theses, Dissertations, and Problem Reports
The dispersion of a gas tracer was used to indicate the effectiveness of the mixing process of an injected flow of solids into the dense bed region of NETL's cold flow CFB riser in three distinctly different fluidization regimes. NETL's cold flow test facility mimics commercial scale transport reactors with side entry of solids into the vertical riser. Pure CO2 was used as the tracer gas and was introduced continuously into the injected flow of solids and it was assumed to essentially remain in the injected flow stream. The tracer gas would be released from the injected flow stream as …