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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 47 for “"Local Heat Transfer"”.
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On the Local Heat Transfer Behavior of Supercritical Carbon Dioxide
<p>A detailed study of the local heat transfer behavior of supercritical carbon dioxide (sCO2) is performed. Flows relevant to heat transfer devices, such as sCO2 heaters, recuperators, and internally cooled turbine blades are studied, with particular attention paid to data reduction methodology, …
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Calculation of Local Heat Transfer Coefficients in Containment After a Loca
Made available in DSpace on 2017-07-06T18:55:06Z (GMT). No. of bitstreams: 3 Leung_Dominic_M_MS.pdf: 34136601 bytes, checksum: 44a40444c0e1c70eae6f96ecb6746631 (MD5) Leung_Dominic_M_MS_ABS.pdf: 452218 bytes, checksum: 53d9dd977a0bc1f5e2366ff5d6d3ba43 (MD5) license.txt: 4813 bytes, checksum: …
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Local heat transfer coefficient in a baffled shell and tube heat exchanger
Local shell side coefficient measurements in the end conpartments of a model shell and tube heat exchanger have been made using an electrochemical technique. Limited data are also reported far the second compartment. The end compartment average coefficients have been found to be smaller than …
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Simultaneous flow visualization and local heat transfer measurements of two-phase flow in plate heat exchangers
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Evaluation of local heat transfer and friction factors in a U-type compound parabolic collector operating as a thermosyphon
… on reflector designs and optical components, the heat transfer characteristics and flow patterns within the absorber tube have not been thoroughly investigated. The flow dynamics inside the absorber tube are unique due to various boundary conditions. These include a non-uniform heat flux around …
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Using the inverse heat conduction problem and thermography for the determination of local heat transfer coefficients and fin effectiveness for longitudinal fins
Heat transfer is a physical process in which energy is exchanged. It occurs in numerous applications, such as production of electricity, building climatisation, food preparation,... Since energy consumption has increased tremendously in the last decades and this trend will continue, the concept of …
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Enhancement of heat transfer coefficient using nanofluids for multi-stage flash desalination (MSF) plant
<p>“The enhancement of thermal conductivity and local heat transfer coefficient, under laminar and turbulent flow regimes, of water-based spherical Al<sub>2</sub>O<sub>3</sub>, CuO, and Fe<sub>2</sub>O<sub>3</sub> nanofluids have been experimentally investigated for the improvement of the thermal …
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CFD in support of development and optimization of the MIT LEU fuel element design
… Dynamics. Coupled conduction and convective heat transfer were modeled for uniform and non-uniform lateral power distributions. It was concluded that, due to conduction, the maximum heat flux ratio on the cladding surface is 1.16, compared to the maximum volumetric power generation ratio of …
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A study of interfacial waves and heat transfer for turbulent condensation in vertical tubes
… was made of the film characteristics and the local heat transfer coefficients for the downward flow of steam condensing in a vertical tube. The mass velocity of the steam was such that the flow occurred in the annular-mist regime. The interfacial wave velocities, frequencies, and amplitudes …
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Flat plate turbulent boundary layer static temperature distribution with heat transfer
… derived based on the differential equations for local heat transfer and shear. The present theoretical method of computation is found to give results that correspond well with available experimental temperature velocity distributions.
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Laminar heat transfer to non-Newtonian fluids in pipes with abrupt changes in diameter
… of experimental work performed to determine local heat transfer coefficients for non-Newtonian fluids in laminar flow through pipes with abrupt discontinuities are reported. The fluids investigated were water-based polymeric solutiorrs of time-indpendent, pseudoplastic materials, with flow …
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Experimental study of natural convection heat transfer and gaseous dynamics from dual-channel circulation loop
… reactor (VHTR) such as plenum-to-plenum heat transfer and gaseous dynamics during natural circulation. Natural circulation of the coolant is the leading capability for VHTR to transport the decay heat from the core to the reactor vessel during accident scenarios. To address this need, a …
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Development and Testing of a Multiplexed Temperature Sensor
… The new sensor also incorporates eight resistive heater elements to provide the heat flux to initiate and sustain boiling. The heaters are capable of delivering up to 100 W/cm^2. This dissertation describes the design and testing of the new temperature sensor and the supporting hardware and …
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Transpiration cooling of a cylinder in crossflow : an experimental investigation
… to determine the effect of air injection on heat transfer from a cylinder in crossflow. The Reynolds number based on cylinder diameter and free stream conditions was varied from 31,200 to 119,000 for the dimensionless injection parameter, f , = (p V /Poo Uoo )//Re(q>range of approximately 0.5 …
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Thermohydraulics and suppression of nucleate boiling in upward two-phase annular flow : probing multiscale physics by innovative diagnostics
… quality increases along the assembly's length as heat is transferred from the fuel rods to the water coolant. Nucleate boiling is the dominant heat transfer mechanism at low and intermediate steam qualities (typical of the bubbly and slug/churn flow regimes), while forced convective evaporation …
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Radiative characteristics of spherical cavities having partially or completely specular walls
… walls is solved and the distribution of the local heat transfer for various opening angles and surface emissivities is obtained. Subsequently, the overall emission from the cavity (i. e., the apparent emissivity of the cavity) is calculated for various opening angles and surface conditions. …
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Tuning energy transport in solar thermal systems using nanostructured materials
… allow us to tune the spectral properties and heat transfer behavior to enable such systems. However, under high temperature conditions, thermal management, system optimization and minimization of parasitic losses are necessary to achieve competitive solar power generation. This thesis seeks to …
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Thermal Boundary Condition Effects On Local Supercritical CO2 Heat Transfer Trends In Tubes
… carbon dioxide (sCO2) is a promising heat transfer fluid for the refrigeration and power generation industries due to its unique thermal properties and low environmental impact. To understand it as an alternative to traditional working fluids, the thermophysical and heat transfer …
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Heat transfer through a condensate droplet on hydrophobic and nanostructured superhydrophobic surfaces
… simulations to study individual droplet heat transfer on non-wetting surfaces (90° < θ_a < 170°). Incorporation of an appropriate convective boundary condition at the liquid vapor interface reveals that the majority of heat transfer occurs at the three phase contact line, where the local …
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