Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 233 for “"Shock Wave"”.
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Unsteadiness in shock-wave/boundary layer interactions
… of the low-frequency unsteadiness observed in shock<br/>wave/turbulent boundary layer interactions has been driving research in this area for<br/>several decades. This work investigates the interaction between an impinging oblique<br/>shock and a supersonic turbulent boundary layer via …
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Shock Wave Dispersion in Weakly Ionized Gas
<p>Electrodeless microwave (MW) discharge in two straight, circular cylindrical resonant cavities in TE<sub>1,1,1</sub> and TM<sub>0,1,2</sub> modes were introduced to perform additional experimental studies on shock wave modification in non-equilibrium weakly ionized gases and to clarify the …
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Shock wave interactions at explosive/metallic interfaces
… was not the cause of the premature fracturing. Shock wave effects were examined, and found to be the cause of the fracturing. Numerical modeling was performed utilizing a two-dimensional Lagrangian finite-difference technique to analyze the effect of the explosive detonation wave on the armature …
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Shock wave interaction in a tee junction
The problem was to determine the unsteady shock wave interaction at a tee junction, and to measure the transmitted shock strength. Two tee junctions of different cross-sectional shape were constructed, and instrumented with three piezoelectric pressure transducers and two hot wire anemometers. …
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Hydrodynamic Shock Wave Effects on Protein Functionality
… and randomly assigned to three hydrodynamic shock wave (HSW) treatments and a control. Different amounts of explosive (105 g, H1; 200 g, H2; 305 g, H3) were suspended in the center of the hemishell tank, 26.7 cm above the vacuum packaged beef placed on the bottom center of that water-filled …
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Planar shock wave interaction with a multiphase cylinder
… study that visualizes the effects of a planar shock front passing through air (or SF6) randomly seeded with glycol droplets or smoke particles. It was observed, using a high-speed multiple-CCD (charge coupled device) camera, that an instability occurs as the shock wave bypasses the slow-moving …
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Group analysis of shock wave phenomena in solids
… point transformations is applied to the study of shock wave propagation through solid media. Theoretically, this method allows for the systematic investigation of all solutions of the set of governing partial differential flow equations that leave the original set of equations invariant.
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Needle-free drug delivery using shock wave techniques
… combustion could be used to create the shock wave required to accelerate the drug particles. This proves that portable reusable devices powered by hydrogen can be constructed and used for vaccine and medication delivery.
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Propagation of gravitons in the shock wave geometry
… thesis, I study propagation of gravitons in the shock wave geometry in the context of the AdS/CFT correspondence, with the goal to uncover some constraint on the supergravity action in the AdS space. In studying the shock wave geometry in an anti-deSitter (AdS) space, I find that the functional …
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Hydrodynamic Shock Wave: Decreasing Broiler Breast Aging Time
The Hydrodyne process was used to tenderize early de-boned broiler (EB) breasts. The first objective was to determine effects of explosive and distance of the explosive to the meat surface. EB breasts were removed immediately after initial chill (45 min post-mortem), stored for 24 hours, and …
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Unsteady shock wave effects on transonic turbine cascade performance
… for experimental assessment of unsteady shock wave effects on turbine blade performance has been developed. A novel shock-generation system utilizing a shotgun blast has been implemented into the Virginia Tech Wind Tunnel Transonic Cascade Facility. Specialized optical systems and …
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Numerical Simulation of Shock Wave Propagation in Ducts with Grooves
<p>The pressure attenuation of moving shocks when they propagate in ducts, is of great importance in a wide variety of applications, such as health, safety, and transportation. The objective of this research is to simulate the propagation of shock waves in ducts with roughness. The roughness is …
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Oblique Shock Wave Effects on Impulsively Accelerated Heavy Gas Column
… to elucidate the fundamental physics of shock-induced mixing for a simple three-dimensional interface. The interface studied consists of a gravity stabilized SF6-based heavy gas jet that produced a circular column with a diffuse interface into the surrounding air. The effects of density …
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Shock wave interaction with a fluid filled cylinder experimental methods
… explosive devices (IED's). Whether pure blast-shock waves cause TBI or what is the mechanism of injury are not fully known. Research efforts are underway to find answers to these questions. The primary objective of this project is to understand how the shockwave interacts with a fluid-filled …
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Sidewall effects in compression corner shock-wave/boundary-layer interactions
… inlets and research wind tunnels. When a shock wave boundary layer interaction (SBLI) occurs in a rectangular cross sectioned duct, the streamwise corner flows tend to separate, resulting in highly three-dimensional behaviour in the sidewall region. These corner separations have been seen …
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Non-invasive shock wave stimulated periosteum for bone tissue engineering
… cell number (2-5 cells thick). Extracorporeal shock waves (ESWs) have been reported to cause thickening of the cambium layer and subsequent periosteal osteogenesis. This work proposes that ESW-therapy can be used as a non-invasive, inexpensive, and rapid method for stimulating cambium cell …
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Modeling of Shock Wave Propagation and Attenuation in Viscoelastic Structures
… from the potentially damaging effects of shock loading is a common design requirement for diverse mechanical structures ranging from shock accelerometers to spacecraft. High-damping viscoelastic materials are employed in the design of geometrically complex impact absorbent components. …
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Laminar/transitional shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flows
Numerical investigations of laminar shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flow have been carried out at M? = 6.85 and M? ? 8, with unit Reynolds numbers ranging from 2.0 x 106 m- l to 7.60 x 106 m- l. This thesis deals with a simplified 2-D geometric configuration to …
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