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http://dx.doi.org/10.3795/KSME-B.2013.37.4.377

Effects of Outflow Area on Pool Boiling in Vertical Annulus  

Kang, Myeong-Gie (Dept. of Mechanical Engineering Education, Andong Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.4, 2013 , pp. 377-385 More about this Journal
Abstract
To identify the effects of an outflow area on pool boiling heat transfer in a vertical annulus, three different flow restrictors were studied experimentally. For the test, a heated tube of smooth stainless steel and water at atmospheric pressure were used. Both annuli with open and closed bottoms were considered. To validate the effects of the outflow area on the heat transfer, the results of the annulus with the restrictor were compared with the data for the plain annulus without the restrictor. The reduction of the outflow area ultimately results in a decrease in the heat transfer. As the outflow area is very small, a slight increase in heat transfer is also observed. The major cause of this tendency is explained as the difference in the intensity of liquid agitation cause by the movement of coalesced bubbles. It is identified that the convective flow, pulsating flow, and evaporative mechanism are considered as the important mechanisms.
Keywords
Heat Transfer; Pool Boiling; Annulus; Vertical Tube; Outflow Area;
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Times Cited By KSCI : 2  (Citation Analysis)
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