Boiling Heat Transfer in an Open Thermosyphon : Report 2, The Influence of the Physical Property on a Heat Transfer Coefficient and on a Critical Heat Flux
Hisao Kusuda,Hideaki Imura +1 more
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TLDR
In this paper, the authors used tubes and annuli as the channel of the open thermosyphon, which consists of an unheated core and an externally heated tube.Abstract:
Experiments on a heat transfer coefficient and a critical heat flux in a vertical open thermosyphon are performed. Tubes and annuli are used as the channel of the open thermosyphon. The latter consists of an unheated core and an externally heated tube. Pure water, ethyl-alcohol, normal-hexane, carbon-tetrachloride and sodium oleate aqueous solution are used as test liquids. Data are obtained with different lengths and diameters of the tube, diameters of the core and entrance fluid temperature of the thermosyphon. The experimental results are correlated on the basis of dimensional analysis and experimental expressioins are presented.read more
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Investigation of Heat Transfer Characteristics of a Two-Phase Closed Thermosyphon
TL;DR: In this article, a simple mathematical model is developed to predict the performance of a two-phase closed thermosyphon, where water, ethanol and Freon 113 are used as the working fluids.
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Heat transfer correlations for small, uniformly heated liquid pools
TL;DR: In this paper, heat transfer data of numerous investigators for uniformly-heated liquid pools of water, ethanol, methanol, Dowtherm-A, R-11 and R-113 in small cylindrical enclosures were compiled, sorted, and correlated in the following heat transfer regimes: (a) natural convection; (b) nucleate boiling; and (c) combined convection).
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Heat Transfer Correlations for Liquid Film in the Evaporator of Enclosed, Gravity-Assisted Thermosyphons
TL;DR: In this paper, heat transfer correlations were developed for the liquid film region in the evaporator section of closed, two-phase, gravity-assisted thermosyphons in the following regimes: (a) laminar convection, at low heat fluxes, (b) combined convection at intermediate heat flows, and (c) nucleate boiling, at high heat flows.
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Theoretical and experimental studies on boiling heat transfer for the thermosyphons with various helical grooves
Kyu-Il Han,Dong-Hyun Cho +1 more
TL;DR: In this paper, the boiling heat transfer characteristics of two-phase closed thermosyphons with copper tubes having 50, 60, 70, 80, 90 internal helical grooves were investigated experimentally.
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Heat-transfer crisis in low-temperature evaporative thermosiphons
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TL;DR: In this article, an experimental investigation is performed for the heat transfer crisis in open and closed low-temperature thermosiphons, and the results show that the heat-transfer crisis occurs in both closed and open lowtemperature systems.
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