Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 21 Issue 10
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- Pages.1254-1261
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- 1997
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
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A study on the pulse boiling occurring inside the liquid pool of a closed two-phase thermosyphon
밀폐형 2상 열사이폰의 Pool 내부 Pulse Boiling에 관한 연구
- Kim, Cheol-Ju (Sungkyunkwan University) ;
- Mun, Seok-Hwan (Sungkyunkwan University) ;
- Gang, Hwan-Guk (Sungkyunkwan University)
- Published : 1997.10.01
Abstract
Pulse boiling, the unsteady periodic boiling phenomenon appearing in the evaporator of thermosyphons was investigated by many researchers. In the present study investigations were conducted to examine the evolution of flow patterns at the evaporator, and changes in thermodynamic state that each of liquid pool and vapor experiences through 1 cycle of pulse boiling process. For wall and liquid pool the degree of superheat for the onset of nucleation was examined. It revealed that the degree of superheat increased with the increase of pulse period, reaching to 16.5 deg.C and 23 deg.C for liquid pool and evaporator wall respectively at .tau.=80 sec. The data on flow patterns obtained through series of operation tests were plotted in the coordinates of heat flux and vapor pressure to get a regime map. Further this map could be used to figure out the conditions of pulse boiling for a thermosyphon.
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