Visualization study on the bubble behavior on a downward facing hemispherical surface during saturated pool boiling

2019 ◽  
Vol 135 ◽  
pp. 1013-1022
Author(s):  
Fei Qin ◽  
Xiang Zhang ◽  
Deqi Chen ◽  
Lian Hu ◽  
Fan Bill Cheung
Keyword(s):  
Pool Boiling ◽  
Bubble Behavior ◽  
Hemispherical Surface

Bubble Behavior in Pool Boiling Heat Transfer between Two Plates with a Narrow Gap

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Jin Sub Kim ◽  
Dong Hwan Shin ◽  
Yeonghwan Kim ◽  
Seung M. You ◽  
Jungho Lee
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Thin Liquid Film ◽  
Ground Plane ◽  
Pool Boiling ◽  
High Heat Flux ◽  
Narrow Gap ◽  
Bubble Behavior ◽  
Military Technology ◽  
Technology Cooperation

Abstract The pool boiling phenomena, which may occur at high heat flux in the planar heat pipe such as vapor chamber and thermal ground plane (TGP), were visually investigated in the vertical orientation by capturing the bubble behavior within a narrow gap between two plates using distilled water at 1 atm. The size of two copper plates is 80×80 mm2 and the 10×10 mm2 ceramic heater, which simulates the high power chip, was bonded to the backside of the bottom plate. The gap between two plates was adjusted from 3 mm to 0.5 mm using spacers. It was observed that the generated bubble spreads laterally throughout the channel between the plates as decreasing the gap. Thin liquid film forms beneath the flattened bubble and the thin film evaporation improves heat transfer at the narrow gaps of 3 and 1 mm. However, further reduction of the gap down to 0.5 mm brings about an increase of the dried region, resulting in the deterioration of boiling heat transfer. [This work was supported by the Civil-Military Technology Cooperation Program of the Institute of Civil-Military Technology Cooperation (ICMTC), with a grant funded by the Defense Acquisition Program Administration and the Ministry of Trade, Industry and Energy (Grant No. 18CM5017).]

Effects of an Electric Field on Nucleate Pool Boiling and Bubble Behavior on a Horizontal Wire

2019 ◽  
pp. 351-356
Author(s):  
Y. C. Kweon ◽  
M. H. Klm ◽  
H. J. Cho ◽  
I. S. Kang ◽  
S. J. Kim
Keyword(s):  
Electric Field ◽  
Pool Boiling ◽  
Nucleate Pool Boiling ◽  
Bubble Behavior ◽  
Horizontal Wire
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