Based on the unique design of the surface morphology, we investigated the effects of gravity and capillary pressure on Critical heat flux (CHF). The micro-structured surfaces for pool boiling tests were comprised with both the rectangular cavity and microchannel structures. The microcavity structures could intrinsically block the liquid flow by capillary pressure effect, and the capillary flow into the boiling surface was one-dimensionally induced only through the microchannel region. Thus, we could clearly establish the relationship between the CHF and capillary wicking flow. The driving potentials for the liquid inflow can be classified into the hydrostatic head by gravitational force, and the capillary pressure induced by the interactions of vapor bubbles, liquid film, and surface solid structures. Through the analysis of the experimental data and visualization of vapor bubble behaviors, we present that the liquid supplement to maintain the nucleate boiling regime in pool boiling condition is governed by the gravitational pressure head and capillary pressure effect.
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13 July 2015
Research Article|
July 15 2015
Enhanced critical heat flux by capillary driven liquid flow on the well-designed surface Available to Purchase
Dong Eok Kim;
Dong Eok Kim
1Department of Precision Mechanical Engineering,
Kyungpook National University
, Sangju 742-711, South Korea
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Su Cheong Park;
Su Cheong Park
2
Department of Mechanical Engineering
, POSTECH, Pohang 790-784, South Korea
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Dong In Yu;
Dong In Yu
3
Division of Advanced Nuclear Engineering
, POSTECH, Pohang 790-784, South Korea
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Moo Hwan Kim;
Moo Hwan Kim
2
Department of Mechanical Engineering
, POSTECH, Pohang 790-784, South Korea
3
Division of Advanced Nuclear Engineering
, POSTECH, Pohang 790-784, South Korea
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Ho Seon Ahn
Ho Seon Ahn
a)
4Division of Mechanical System Engineering,
Incheon National University
, Incheon 406-772, South Korea
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Dong Eok Kim
1
Su Cheong Park
2
Dong In Yu
3
Moo Hwan Kim
2,3
Ho Seon Ahn
4,a)
1Department of Precision Mechanical Engineering,
Kyungpook National University
, Sangju 742-711, South Korea
2
Department of Mechanical Engineering
, POSTECH, Pohang 790-784, South Korea
3
Division of Advanced Nuclear Engineering
, POSTECH, Pohang 790-784, South Korea
4Division of Mechanical System Engineering,
Incheon National University
, Incheon 406-772, South Korea
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
Appl. Phys. Lett. 107, 023903 (2015)
Article history
Received:
May 30 2015
Accepted:
July 06 2015
Citation
Dong Eok Kim, Su Cheong Park, Dong In Yu, Moo Hwan Kim, Ho Seon Ahn; Enhanced critical heat flux by capillary driven liquid flow on the well-designed surface. Appl. Phys. Lett. 13 July 2015; 107 (2): 023903. https://doi.org/10.1063/1.4926971
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