Prediction of critical heat flux on natural convective boiling in vertical short-thick tube submerged in saturated liquid

2003 ◽  
Vol 32 (5) ◽  
pp. 402-410
Author(s):  
Zhen-Hua Liu
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Saturated Liquid ◽  
Convective Boiling

Critical Heat Flux During Natural Convective Boiling in Vertical Rectangular Channels Submerged in Saturated Liquid

1982 ◽  
Vol 104 (2) ◽  
pp. 300-303 ◽  
Author(s):  
M. Monde ◽  
H. Kusuda ◽  
H. Uehara
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Atmospheric Pressure ◽  
Heated Surface ◽  
Saturated Liquid ◽  
Convective Boiling ◽  
Flux Data ◽  
Rectangular Channels ◽  
Generalized Correlation

An experimental study of the critical heat flux has been carried out for natural convective boiling at atmospheric pressure in vertical rectangular channels. Experiments in four kinds of test liquids (water, ethanol, freon 113, and benzene) have been made for the ratio l/s less than 120, in which l is the length of the heated surface and s is the width of the channels. A generalized correlation for the critical heat-flux data in the four test liquids is evolved.

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.

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