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 65 for “"pressure losses"”.
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Pressure losses at bends and junctions
… whether the CFD simulations could yield accurate pressure loss data for input into a one-dimensional engine simulation code. The experiments were carried out on a steady flow rig, and three bends with varying degrees of curvature, a T-junction, and a Y-junction were tested. The experiments covered …
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Pressure losses and rheological properties of flowing butter
Thesis (M.S.)--Michigan State University. Dept. of Food Science, 1964
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Prediction of pressure losses in pneumatic conveying pipelines
… of a need to improve the accuracy with which the pressure drop along pneumatic conveying pipelines in process plant could be predicted. The methods previously available for making this prediction are examined and critically assessed. The need for a different method is shown, and a new approach is …
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Reduction of excess fan power due to economizer damper pressure losses
An air conditioning system economizer, investigated in this thesis, consisted of three dampers, an outdoor air, a recirculation, and a discharge damper. The purpose of an economizer is to control the ratio of the outdoor air flow rate to the recirculation air flow rate. The dampers were opposed …
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The prediction of flow patterns, liquid holdup and pressure losses occurring during continuous two-phase flow in horizontal pipelines
… nipples the flow patterns were photographed. Pressure taps were located at fourteen points in each line enabling the construction of pressure-length traverses for each test run. Data obtained during the experimental investigation were used to develop three correlations. The first correlation …
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The effect of particle size and density on pressure gradients in horizontal pipelines in lean phase pneumatic conveying
… need to improve the accuracy of predicting the pressure losses along pneumatic conveying systems, and in particular, an investigation into the reasons why materials behave differently to each other when conveyed pneumatically along pipelines. It was intended that the information obtained from …
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Analysis of a Turbopiston Pump
… to deliver large flow rates at very high pressure of up to 1000 psia. To improve the original design, an understanding of flow behavior inside the pump is needed. Therefore, this thesis focuses on simulating the flow field inside the pump and studying its performance. This study includes …
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Experimental and Computational Investigation of Thermal-Flow Characteristics of Gas Turbine Reverse-Flow Combustor
… to provide cooling at an expense of large pressure losses, through small jet impingement cooling and strong forced convention channel flow. With the modern advancement in metallurgy and thermal-barrier coating technologies, it may become possible to remove this sheath to recover the …
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Experimentally Determined Equivalent Roughness Values For Two Types of Longitudinal Straight Duct Produced by a Small Company
This study evaluates the static pressure losses due to friction in longitudinal straight ducts. These losses are related to the flow properties (velocity, density, etc.) by means of the Darcy friction factor, f. In the case of hydraulically smooth wall conditions the f value is related to the …
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A CFD analysis of the pressure drop through misaligned Stirling engine regenerators
… the effect of wire mesh misalignment on the pressure drop for ow through a regenerator. A friction factor correlation equation was developed and it was found that a perfectly aligned regenerator could result in a 38% to 45% decrease in pressure losses. The model was also used to determine the …
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Effects of Mach Number and Flow Incidence on Aerodynamic Losses of Steam Turbine Blades
… was conducted to investigate the aerodynamic losses of two high-pressure steam turbine nozzles (526A, 525B) subjected to a large range of incident angle and exit Mach number. The blades were tested in a 2D transonic windtunnel. The exit Mach number ranged from 0.60 to 1.15 and the incidence …
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Numerical analysis of the thermal performance of vapour compression heat pump heat exchanger using Python and computational fluids dynamics (CFD)
… the literature values. The heat transfer rates, pressure losses, vapour quality and all refrigerant properties are calculated by discretizing each tube on each tube circuit and tube row into several increments and incorporating nonuniform airflow in three dimensional. The model is validated using …
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Heat Transfer in Stationary and Rotating Coolant Channels Using a Transient Liquid Crystal Technique
… to the two-pass channels with ribs, however pressure losses are significantly higher. The fewer the jets and H/d=1 produces the highest pressure losses with no significant gain in heat transfer. Off angle jets at H/d=1 produces very high pressure losses with no heat transfer advantage. A …
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Fuel-vortex interactions for enhanced mixing in supersonic flow
… to the physical ramp. In all cases, the total pressure losses suffered with the aero-ramp were less than those incurred with the physical ramp. For both injectors, the total pressure losses decreased with increasing jet momentum. Finally, an analytical relationship predicting the Rayleigh …
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Capillary rheometry of soy isolate dough
… stresses, melt fracture and sample reservoir pressure losses.
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Practical Applications of Delta Winglets in Compact Heat Exchangers with Louvered Fins
… while only causing small increases in overall pressure losses. With the recent emphasis that has been placed on reducing fuel consumption, decreasing the size of the compact heat exchanger has become an important concern. With reduction in size comes not only weight savings, but also a decrease …
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Full-Scale Testing Of A Passively Modulated Oil-To-Air Cooler
… This leads to unwanted flow structures and total pressure losses within the bypass, increasing the thrust-specific fuel consumption. There exists an opportunity to improve the performance of the cooler system by modulating its heat rejection to match the thermal load being generated by the gas …
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Experimental and numerical investigation of transonic turbine cascade flow
… through a two-dimensional cascade of the high pressure turbine blades of a jet engine is presented. The main interest is the measurement and prediction of the mass-averaged total pressure losses. Other experiments, such as flow visualization, are aimed at the validation of the code that was …
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Uma equação para o cálculo do atrito entre fases em escoamentos turbulentos estratificados em tubulações circulares
… there are several methods to calculate friction pressure losses in such processes. These methods involve friction factors, parameters that depend on flow conditions and fluid property. The interfacial friction factor represents the friction tension generated from the interaction between fluids, …
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Design of motor controller water cooling system for a Formula SAE electric racecar
… used in an FSAE Electric racecar. Models for pressure drop and rate of heat transfer along with the constuction of Computational Fluid Dynamics (CFD) simulations are presented to predict the pressure drop and heat transfer rate. The goal is to provide a framework to design cold plates for …
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