An Experimental Investigation of Boiling Heat Transfer of Fluorocarbon R-11 Refrigerant for Concentric-Tube Thermosyphon

[+] Author and Article Information
N. Seki, S. Fukusako, K. Koguchi

Department of Mechanical Engineering, Hokkaido University, Sapporo 060, Japan

J. Heat Transfer 103(3), 472-477 (Aug 01, 1981) (6 pages) doi:10.1115/1.3244488 History: Received July 03, 1980; Online October 20, 2009


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.

Copyright © 1981 by ASME
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