The characteristics of the boiling heat transfer for a concentric-tube open thermosyphon are examined in detail. Fluorocarbon R-11 refrigerant as a testing fluid is utilized. Out of a number of possible controlling variables, the effects of the heat flux, the void ratio, and the diametric ratio of the concentric-tube on the heat-transfer performance are determined. From the present experimental results it is demonstrated that total heat flux can be appropriately predicted by a superposition of the heat flux due to the available correlations for free convection and due to the correlations experimentally determined for boiling heat flux.
An Experimental Investigation of Boiling Heat Transfer of Fluorocarbon R-11 Refrigerant for Concentric-Tube Thermosyphon
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Seki, N., Fukusako, S., and Koguchi, K. (August 1, 1981). "An Experimental Investigation of Boiling Heat Transfer of Fluorocarbon R-11 Refrigerant for Concentric-Tube Thermosyphon." ASME. J. Heat Transfer. August 1981; 103(3): 472–477. https://doi.org/10.1115/1.3244488
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