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 80 for “"Heat-transfer rate"”.
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Nano-engineering the boiling surface for optimal heat transfer rate and critical heat flux
… on pool boiling characteristics such as critical heat flux and the heat transfer coefficient of different surface characteristics such as surface wettability, roughness, morphology, and porosity are not well understood. Layer-by-layer nanoparticle coatings were used to modify the surface of a …
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Computational Analysis to Enhance Laminar Flow Convective Heat Transfer Rate in an Enclosure Using Aerosol Nanofluids
… a starting point to effectively model aerosol heat transfer in a narrow, enclosed body. This research can lead to future modeling of nano fluids including their heat transfer characteristics and erosion effects on the walls of an enclosure. The model was developed using ICEM CFD for the mesh …
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An investigation of the effect of entrained oil on the heat transfer rate of a refrigerant evaporator
… with the effect of entrained oil on the heat transfer characteristics of a direct expansion evaporator coil. A modified refrigeration system, in which the oil content of the refrigerant could be varied, was used in conjunction with an air conditioning system, which supplied the evaporator …
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Heat transfer from a spherical surface by jet impingement: an experimental study
Methods for the removal of heat from a sphere, via jet impingement by single and multiple jets was documented experimentally. Average heat transfer rates from a sphere maintained at constant temperature, by means of an internal electronic heater, and subjected to single or multiple jet impingements …
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Development of a numerical method to solve the three-dimensional compressible laminar boundary-layer equations with application to elliptical cones at angle of attack
… number of 7.95 are presented. Skin friction and heat-transfer-rate distributions are presented for all cases. Good agreement has been found with experiment for the heat-transfer rates on circular cones at angle of attack. It has also been determined that increasing ellipticity tended to produce …
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Optimization of the design of an extended surface with finned pins
… pins have proved to be unique in increasing the rate of heat transfer. Hsieh working on the original idea ot professor Hsu proved that heat transfer rate can be further increased by putting annular fins on a pin. In this thesis the design of finned pin was optimized to give maximum heat transfer …
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Combined Convection of Packer Fluid Flow between Vertical Parallel Plates
… is to prevent or tremendously reduce the heat transfer rate which would occur from the production tubing area to the production casing region is being studied in recent decades because of its wide applications in Oil & Gas Industry. Reduction of heat transfer rate can lead to the …
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Geometry effect on post-dryout heat transfer.
… channel shape and spacing devices on post-dryout heat transfer has been performed. Overall, very little information is available for these effects, several experiments were carried out covering only limited flow conditions and geometries. To extend the present review, studies with air flow through …
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Effect of vibration on heat transfer from wires in parallel flow
… of this Investigation was to determine the heat transfer rate and characteristics of three vibrated wires In a parallel flow. A simple experimental apparatus was constructed with which to pursue the investigation, and various results were obtained. Three wires of different diameters were …
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Comparison of oil and intensive quenching via coupled thermal, transformation, and mechanical modeling
… as well as high intensity quenching which has a heat transfer rate of 20 kW/(m2 °C) were simulated. After quenching, the non-carburized and oil quenched bars were predicted to have tensile residual hoop stresses at the surface while the carburized bars were predicted to have compressive residual …
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Mixed convection in laminar/turbulent separated backward-facing step flows
<p>"Mixed convective heat transfer results for two-dimensional laminar/turbulent flow in a duct with a backward-facing step are reported. The two walls forming the duct are maintained at uniform but different temperatures. The straight wall is maintained at the inlet air temperature, while the …
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Shock Physics of Non-Ideal Detonations for Energetic Explosives With Aluminum Particles
… Additionally, under certain combinations of heat transfer rate and chemical release rate, the measured behavior can be reproduced, and the model results indicate that these phenomena have a significant effect on the detonation parameters and should be included in future models.
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Thermo-hydraulic study of inclined louvered fins
Heat transfer is a naturally occurring process. It is used in a multitude of technical and domestic applications such as climate control, preparation and conservation of food, production of electricity. . . As such heat transfer affects every facet of our daily lives. Over the past decades the …
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Effect Of Coriolis And Centrifugal Forces On Turbulence And Transport At High Rotation And Buoyancy Numbers
… and challenging problems in fluid flow and heat transfer for rotating machines. The study focuses on gas turbines and electric generators for high temperature and high energy density applications, respectively, both which employ rotating cooling channels so that materials do not fail under …
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Forced convection heat transfer from extended surfaces with finned pins
… "h" by means of forced convection the heat transfer rate of a finned pin can be considerably improved. For an average flow rate of air over the extended surfaces, throughout the investigation the increase in the effectiveness was as much as 4.60 times over the free convection process. …
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Investigation on the Interaction of an Impinging Jet with Cylinder Wakes
… is a widely used cooling method due to the high heat transfer rates associated with it. Research for improving heat transfer rates for this cooling is still being carried out due to its broad application in various fields like gas turbine blade cooling, electronic component cooling, and paper …
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Simulation of steady mixed convection in a lid-driven cavity filled with newtonian fluid by finite volume method
… were either fixed cold and uniformly/oscillatory heated. Firstly, the effect of internal heat generation or absorption on the fluid flow and heat transfer behaviours was studied. The moving upper wall was uniformly heated while the bottom wall was kept cold. The effect of magnetic field on fluid …
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Thermo properties of quaternary molten salt heat transfer fluid for heat recovery system
In the context of the heat recovery system, the application of heat transfer fluid is one of the essential factors that can improve the efficiency of the system. According to the previous research, quaternary molten nitrate salt mixture has been proved to be an excellent heat transfer fluid in the …
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A Spatial Stefan Problem Modified by Natural Convection: Melting Around a Horizontal Cylinder
… problem--the melting of a solid about a heated horizontal cylinder. A radial transformation is used which transforms highly irregular boundaries into simple geometric shapes and immobilizes moving boundaries. The transformation provides the basis for numerical and perturbation methods …
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Numerical and Experimental Studies of Natural Convective Heat Transfer From Vertical and Inclined Narrow Flat Plates and Short Cylinders
Natural convective heat transfer from flat plates and short cylinders inclined at an angle to the vertical in laminar and transition flow regions with isothermal or constant heat flux conditions have been numerically and experimentally studied. When the width of the plate is relatively small …
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