An experimental study on the critical heat flux for low flow of water in a non-uniformly heated vertical rod bundle over a wide range of pressure conditions

2005 ◽  
Vol 235 (21) ◽  
pp. 2295-2309 ◽  
Author(s):  
Sang-Ki Moon ◽  
Se-Young Chun ◽  
Seok Cho ◽  
Won-Pil Baek
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Low Flow ◽  
Rod Bundle ◽  
Wide Range

An Experimental Study on the Critical Heat Flux for Low Flow of Water in Bilaterally Heated Vertical Annuli Under Low Pressure Conditions

2014 ◽  
Author(s):  
Lei Zhou ◽  
Guangxu Liu ◽  
Yuanfeng Zan ◽  
Xiao Yan
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Nuclear Power ◽  
Low Pressure ◽  
Operating Conditions ◽  
Low Flow ◽  
Plant Design ◽  
Water Reactors ◽  
Vertical Annuli

Critical heat flux (CHF) has been widely studied in the past decades because of its importance for nuclear power plant design. But most of the studies are based on flow under normal operating conditions for light water reactors. CHF under low flow and low pressure is of significance when considering operating transients and accidents. In this study, experimental study has been carried out on CHF for low flow rate and low pressure water flow in vertical bilaterally heated annuli. Parameter trends on CHF is discussed and a new predictive correlation was fitted based on the CHF data points. This study is meaningful for concerned nuclear engineering and similar experiment design.

An experimental study of critical heat flux in non-uniformly heated vertical annulus under low flow conditions

2003 ◽  
Vol 17 (8) ◽  
pp. 1171-1184 ◽  
Author(s):  
Se-Young Chun ◽  
Sang-Ki Moon ◽  
Won-Pil Baek ◽  
Moon-Ki Chung ◽  
Masanori Aritomi
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Low Flow ◽  
Flow Conditions ◽  
Vertical Annulus

Experimental study on critical heat flux of highly efficient soft hydrophilic CuO–chitosan nanofluid templates

2016 ◽  
Vol 100 ◽  
pp. 396-406 ◽  
Author(s):  
Ravi Kumar Cheedarala ◽  
Eunju Park ◽  
Kyungil Kong ◽  
Young-Bin Park ◽  
Hyung Wook Park
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Highly Efficient

On the Nature of Critical Heat Flux in Microchannels

2005 ◽  
Vol 127 (1) ◽  
pp. 101-107 ◽  
Author(s):  
A. E. Bergles ◽  
S. G. Kandlikar
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Flow Boiling ◽  
Flow Distribution ◽  
High Heat ◽  
Operating Conditions ◽  
High Heat Flux ◽  
Clear Understanding ◽  
Wide Range ◽  
Parallel Microchannels

The critical heat flux (CHF) limit is an important consideration in the design of most flow boiling systems. Before the use of microchannels under saturated flow boiling conditions becomes widely accepted in cooling of high-heat-flux devices, such as electronics and laser diodes, it is essential to have a clear understanding of the CHF mechanism. This must be coupled with an extensive database covering a wide range of fluids, channel configurations, and operating conditions. The experiments required to obtain this information pose unique challenges. Among other issues, flow distribution among parallel channels, conjugate effects, and instrumentation need to be considered. An examination of the limited CHF data indicates that CHF in parallel microchannels seems to be the result of either an upstream compressible volume instability or an excursive instability rather than the conventional dryout mechanism. It is expected that the CHF in parallel microchannels would be higher if the flow is stabilized by an orifice at the entrance of each channel. The nature of CHF in microchannels is thus different than anticipated, but recent advances in microelectronic fabrication may make it possible to realize the higher power levels.

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