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 6 of 6 for “"Non-uniform heat flux"”.
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Evaluation of local heat transfer and friction factors in a U-type compound parabolic collector operating as a thermosyphon
… compound parabolic concentrators (XCPCs) are non-imaging solar collectors for low- to medium-temperature applications (60°C to 300°C). The XCPC collector comprises an aluminium compound parabolic reflector and an evacuated tube receiver with a direct flow U-shaped absorber tube. Although …
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Thermocapillary Convection During Laser Surface Heating (Surface Tension)
The fluid flow and the heat transfer during laser surface heating are studied. Surface tension gradient is identified as the dominant force from an order of magnitude consideration. Mathematical models for the thermocapillary convection within the molten pool are thus formulated. The models are …
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Optical and Thermal Analysis of a Heteroconical Tubular Cavity Solar Receiver
… The effect of cavity geometry on the heat flux distribution on the receiver absorbers as well as on the optical performance of the Heteroconical cavity was investigated. The cavity geometry was varied by varying the cone angle and cavity aperture width of the receiver. This …
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Assessment of helical-cruciform fuel rods for high power density LWRs
… larger surface-to-volume ratio, a shorter radial heat conduction path, and improved mixing characteristics. In previous work, computational models of the HC fuel assembly have been of limited accuracy due to the absence suitable correlations. To address needs within these subchannel analysis …
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Instability of flow boiling in parallel microchannels
Heat exchangers are key components of energy conversion systems, including HVAC&R equipment. The compact microchannel design of a heat exchanger (MCHX) allows for significant reduction of its volume, weight, and raw material, in comparison to conventional fin-and-tube heat exchangers in HVAC&R …
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Steam condensation in flattened-tube air-cooled condensers
… of void fraction, pressure drop, capacity and heat transfer coefficient for flattened-tube air-cooled steam condensers with inner dimensions of 216 mm height x 16 mm width. Two lengths of tube are investigated: 10.7 m and 5.7 m. The tubes are steel with brazed wavy aluminum fins of 200 mm …