Experimental Investigation of the Hydrocarbons Pool Boiling on Porous Structures

2002 ◽  
Author(s):  
Leonard L. Vasiliev ◽  
Alexander S. Zhuravlyov ◽  
Mikhail N. Novikov ◽  
A.V. Ovsianik ◽  
Leonid L. Vasiliev, Jr.
Keyword(s):  
Experimental Investigation ◽  
Pool Boiling ◽  
Porous Structures

Combined Pressure and Subcooling Effects on Pool Boiling From a PPGA Chip Package

1997 ◽  
Vol 119 (2) ◽  
pp. 95-105 ◽  
Author(s):  
A. A. Watwe ◽  
A. Bar-Cohen ◽  
A. McNeil
Keyword(s):  
Heat Flux ◽  
Experimental Investigation ◽  
Critical Heat Flux ◽  
Pool Boiling ◽  
Combined Effects ◽  
Minimal Effect ◽  
Nucleate Pool Boiling ◽  
Lower Wall ◽  
Saturated Liquid

This study presents a detailed experimental investigation of the combined effects of pressure and subcooling on nucleate pool boiling and critical heat flux (CHF) for degassed fluorocarbon FC-72 boiling on a plastic pin-grid-array (PPGA) chip package. In these experiments pressure was varied between 101.3 and 303.9 kPa and the subcooling ranged from 0 to 65°C. As expected, lower wall superheats resulted from increases in pressure, while subcooling had a minimal effect on fully developed pool boiling. However, the superheat reductions and CHF enhancements were found to be smaller than those predicted by existing models. The CHF for saturated liquid conditions increased by nearly 17 percent for an increase in pressure from 101.3 to 202.7 kPa. In experiments with both FC-72 and FC-87 further increases in pressure did not produce any significant increase in CHF. At a pressure of 101.3 kPa a subcooling of 30°C increased CHF on horizontal upward-facing chips by approximately 50 percent, as compared to 70 percent on vertically oriented packages. The enhancement in CHF due to subcooling decreased rapidly with increasing pressure, and the data showed that the influence of pressure and subcooling on CHF is not additive. A correlation to predict pool boiling CHF under the combined effects of pressure and subcooling is proposed.

Experimental Investigation of CHF Enhancement on the Modified Surface Under Pool Boiling

2009 ◽  
Vol 33 (11) ◽  
pp. 840-848
Author(s):  
Soon-Ho Kang ◽  
Ho-Seon Ahn ◽  
Hang-Jin Jo ◽  
Moo-Hwan Kim ◽  
Hyung-Mo Kim ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Pool Boiling ◽  
Modified Surface
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