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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 33 for “"Flow mixing"”.
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Scale-up of oscillatory flow mixing
Oscillatory Flow Mixing is a recent development in mixing technology which has evolved over the past decade. It has a number of similarities to other mixing technologies, particularly pulsed and reciprocating plate columns, but at the laboratory scale has demonstrated a number of advantageous …
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Low flow mixing in open channels
… and pollution in natural streams under low flow conditions, during which pollution problems are most acute, a complete understanding of the effects of variations of flow and channel geometry on mixing and transport of polluted releases is necessary to establish sound water pollution control …
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Development of a to-scale fluid mixing visualization process for analysis of cold-flow mixing
… system efficiency. In order to analyze the mixing efficiency in a swirl-type mixer such as the design proposed for the small-scale torrefaction system, a project was designed to visualize mixing in an annular mixer. A to-scale cold-mixing system was constructed from two cylinders, three pump …
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A Study of Compressible Turbulent Free Shear Layers Using Laser Doppler Velocimetry (Supersonic Flow, Mixing, Recirculating)
… layers formed by the separation of a Mach 2.43 flow over a backward facing step was conducted. Two different wind tunnel test sections were used to achieve a constant pressure separation of the shear layer at the backstep corner so that the developing free shear layer was unaffected by …
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The characterisation of the hydrodynamic vortex separator using residence time distribution analysis.
… in the sewerage system as a combined sewer overflow (CSO) for the separation of solids from an incoming waste stream. This project presents the first stage in developing and aiding the existing design methodology for the optimisation of kinetic processes within the HDVS. The kinetic process …
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Early Events in the Folding of the Protein Ubiquitin
… technique and by low temperature stopped flow mixing. In the case of the T-Jump, initially cold denatured protein solution is rapidly heated with a 20 nsec heating pulse. The subsequent refolding is monitored by time resolved fluorescence lifetime and spectrum. In the case of stopped flow …
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Numerical simulation of a single wafer atomic layer deposition process
… reactor consist of a warm wall horizontal flow tube, a single disc mounted halfway down the tube, and an alternating cycle flow between a reactant gas and a wash in a carrier gas. The process is governed by the desire to achieve a uniform coating on the substrate layer. Optimization is …
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Effects of rotor tip clearance on an embedded compressor stage performance
… The optimum tip gap is set by two competing flow processes: decreasing tip leakage mixing loss and increasing viscous shear loss at the casing with decreasing tip gap. An optimum tip gap scaling is established and shown to satisfactorily quantify the optimal gap value. For medium tip gap …
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Adaptive Finite Element Computation of Chemical Flow Reactors
The main interest in the simulation of flow reactors is the comprehension of the complex interplay between flow, mixing processes and reaction processes. To describe the chemical and physical processes taking place in reactive flows, many chemical species are to be considered with often a few …
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The Influence of Mixing Duct Length and Phase of Flight on Wall Temperatures of a Rocket Based Combined Cycle Engine in Ejector and Air-Augmented Modes
… rocket propulsion by entraining a secondary flow of atmospheric air and mixing it with the exhaust of a rocket motor. Students within the Embry-Riddle Future Space Explorers and Developers Society (ERFSEDS) identified a<br />problem of excessive heating and structural failure of the mixing …
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Experimental Investigation of a Lean, Premixed Gas Turbine Combustor Using Advanced Laser Diagnostics
… for each test condition, revealing a combustion flow field dominated by large-scale turbulent structures. Stabilization of the flame occurred primarily in the side recirculation zone at the edge of the premixer exit. Single-shot temperature measurements were made using coherent anti-Stokes Raman …
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Experimental and Computational Study of Roughened Surface For PWR Rod Bundles
<p>PWRs fuel assemblies utilize spacer grids with flow mixing vanes to augment the coolant turbulence and improve heat transfer from the fuel rods. However, in the regions where the turbulence due to mixing vanes is the lowest, the heat transfer is the worst, resulting in higher temperatures and …
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A coupled DEM/CFD analysis of die filling process
This thesis reports numerical analyses of powder flow, mixing and segregation behavior during die filling in a vacuum and in air using an Eulerian-Lagrangian model, which employs a Discrete Element Method (DEM) for the particles and Computational Fluid Dynamics (CFD) for the air with a two-way …
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Modelling of physical and chemical processes in the small intestine
… which enabled investigation into the fluid flow, mixing mechanisms and delivery of nutrients to the wall of the model small intestine. Designing, developing and using the Small Intestinal Model (SIM), a physical model of a section of the small intestine, mimicking the physiological …
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Acoustic and thermal packaging of small gas turbines for portable power
… is the relatively large required cooling mass flow and the short flow mixing length, constrained by package size considerations. The objective is to conceive a proof-of-concept engine package with exhaust temperatures of 60 °C and a noise signature below 50 dBA at a distance of 7 m. Various …
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The mitigation of crystallization fouling in a falling-film flow: A self-cleaning mechanism driven by flow and wetting behavior
… to the formation of the fouling layer, increased flow resistance, and performance/product line interruption due to the cleaning routine. During regular cleaning and pre-or-pro anti-scaling treatment, commonly utilized hazardous chemicals not only add operational costs but also leave a significant …
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Tip leakage loss development in a linear turbine cascade
… based upon blade axial chord was 4.5x10⁵. The flow was measured at a plane 0.96 axial chords downstream from the blade leading edge. Barlier studies performed at the tip gap exit and at a downstream plane 1.4 axial chords from the blade leading edge were utilized with the present study to …
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Heat Transfer and Flow in Solar Energy and Bioenergy Systems
… dissertation focuses on the heat transfer and flow in solar energy and bioenergy systems, specifically for Thermal Energy Storage (TES) systems in Concentrated Solar Power (CSP) plants and open-channel algal culture raceways for biofuel production. The first part of this dissertation is the …
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Wall-Jet Turbulence and Mixing Control by Way of a Pulsed Inlet Velocity
<p>Understanding wall-jet-induced turbulence and mixing is an important challenge in modern engineering, as drag reduction and mixing enhancement are attainable by modifying the flow development. Simulations are performed to investigate the effect on skin friction and flow mixing due to introducing …
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Experimental and numerical investigation of jet mixing
Supersonic mixing or in other words the mixing of two streams flowing at different speeds has been studied a lot in the past pertaining especially to the effect of high speed stream flow mixing with a slow stream. The various techniques developed have always had the drawback of high pressure losses …
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