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 16 of 16 for “"high-speed videos"”.
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An Optical Analysis of the Blowoff Behavior for Bluff Body-Stabilized Flames in Vitiated Flow
… emissions gas analyzer, respectively. </p> <p>High-speed videos of these flames undergoing blowoff were taken to serve as the primary data source for analysis. To examine the effects of Bénard-von Kármán vortex instabilities and local strain-induced extinctions on the lean blowoff process, …
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Droplet Rebound and Atomization Characteristics of Vibrating Surfaces
… droplets when passing through clouds at high altitudes, causing loss of lift obtained by the wings. It was found that droplet impact characteristics are dependent on droplet size, surface roughness, surface material hydrophobicity, and droplet impact velocity. As a continuation of the …
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Falling-film evaporation over horizontal rectangular tubes
… exchangers has the potential to provide compact, high-performance components for a wide range of applications. This fluid flow was investigated experimentally, targeting three areas: measurements of heat transfer coefficients, quantification of flow characteristics, and the performance of flow …
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Oil retention and pressure drop of R1234yf and R134a with POE ISO 32 in suction lines
… of oil is carried out of the compressor by high velocity vapor leaving the compressor discharge in the form of a mixture with the refrigerant. The circulating liquid which is a mixture of oil and refrigerant has the highest viscosity in the suction line to the compressor due to which it has …
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Measurements in a compressible planar shear layer with a thermal gradient
… into the compressible shear layer, albeit with a higher shear layer growth rate. Temperature probe traverses throughout the shear layer were obtained at different streamwise points, as well as static pressure measurements along the entire test section side-wall. Schlieren visualizations in the …
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Analyzing the size effect on fracture toughness of mortar through flattened Brazilian tests
… decrease with increasing 2[alpha]. In addition, High speed videos and high resolution images indicate that the primary crack initiated at the specimen center, and propagated along the vertical center line.
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Experimental investigation of coal combustion in coal-laden methane jets
… particles with respect to the fluid velocity. High-resolution still images and high-speed videos of laser-sheet light scattered by the coal particles helped determine the mode of interaction of entrained coal particles with the flame front. The effect of combustion on the entrained coal …
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Oil flow from compressor valve to discharge tube
… the how oil enters into the compressor plenum. High speed videos are taken to look at the valve and the discharge tube in order to get the oil droplet size and velocity. Due to the difficulty of flow visualization in the plenum space, computational fluid dynamics (CFD) is used to simulate the …
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Exploring Ciliary Dynamics: Assessing Motility and Induced Velocity in Human Airway Cell Cultures
… significantly packed within a cell. Due to the high cilia density, steric interactions between cilia are thus possible. Moreover, cilia are immersed in a non-Newtonian fluid, whose elastic modulus plays an important role for the synchronisation and are tethered by mucins that provide further …
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The dynamics of ultrafast motion in biological and bio-inspired systems: the case study of click beetles
… up to 106 m/s2. These animals generate such high accelerations using complex latch and spring systems to overcome their muscle force-speed trade-offs and amplify mechanical power output. This dissertation introduces a multi-scale analytical and experimental framework to investigate how …
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Experimental investigation of mist flow generated by reed valves in compressor discharge
… size, drop velocity are determined by obtaining high speed videos of the flow in a compressor equipped with optical access and performing image processing in those videos to quantify the variables of interest. The evolution of this study starts from focusing on the discharge tube and makes its …
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Motor control and directional accuracy of phonotaxis in female field crickets
… the auditory-induced motor responses, I recorded high-speed videos of crickets performing phonotaxis and tracked the movement of their bodies and appendages. The video analysis showed that when crickets commence phonotaxis, their body parts and appendages are activated and moved from anterior to …
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Non-intrusive two-phase flow regime identification and transport characterization in microchannels subject to uniform and non-uniform heat input
… management solution for the dissipation of high heat fluxes, specifically under boiling conditions that provide high rates of heat transfer at a uniform heat sink temperature. Under two-phase flow conditions, the heat transfer and pressure drop are a function of the local flow regime. …
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Effect of micro-fin geometry on flow and heat transfer during evaporation in round tubes
… quantification and analysis of the captured high speed videos help further examine the heat transfer mechanisms in different flow regimes. The first focus of this thesis is to experimentally investigate the effect of axial micro-fins on heat transfer and pressure drop during evaporation in …
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Enhancement of Nucleate Boiling on Rough and Dimpled Surfaces with Application to Composite Spreaders for Microprocessors Immersion Cooling
… for immersion nucleate boiling cooling of high powered microprocessors requiring heat spreaders of different sizes. The PF-5060 has a saturation temperature of 51.4oC at ~0.085MPa — the local pressure in Albuquerque NM, where the experiments were carried out. Because various circuit board …
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The effect of gas on multi-stage mixed-flow centrifugal pumps
… multiphase flows. Laser Doppler Velocimetry and high speed imaging in single phase flow showed a high turbulence level in the wake of the impeller blades, and recirculation cells at low flow rates. In gas-liquid conditions, we demonstrated that the bubble size varies within a pump stage, as …