The pool boiling characteristics of water-based nanofluids with alumina and titania nanoparticles of were investigated on a thermally heated disk heater at saturated temperature and atmospheric pressure. The results confirmed the findings of previous studies that nanofluids can significantly enhance the critical heat flux (CHF), resulting in a large increase in the wall superheat. It was found that some nanoparticles deposit on the heater surface during nucleate boiling, and the surface modification due to the deposition results in the same magnitude of CHF enhancement in pure water as for nanofluids. Subsequent to the boiling experiments, the interfacial properties of the heater surfaces were examined using dynamic wetting of an evaporating water droplet. As the surface temperature increased, the evaporating meniscus on the clean surface suddenly receded toward the liquid due to the evaporation recoil force on the liquid-vapor interface, but the nanoparticle-fouled surface exhibited stable wetting of the liquid meniscus even at a remarkably higher wall superheat. The heat flux gain attainable due to the improved wetting of the evaporating meniscus on the fouled surface showed good agreement with the CHF enhancement during nanofluid boiling. It is supposed that the nanoparticle layer increases the stability of the evaporating microlayer underneath a bubble growing on a heated surface and thus the irreversible growth of a hot/dry spot is inhibited even at a high wall superheat, resulting in the CHF enhancement observed when boiling nanofluids.
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On the Mechanism of Pool Boiling Critical Heat Flux Enhancement in Nanofluids
Hyungdae Kim,
Hyungdae Kim
Department of Nuclear Engineering,
e-mail: hdkims@khu.ac.kr
Kyung Hee University
, Yongin-city 446-701, Republic of Korea
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Ho Seon Ahn,
Ho Seon Ahn
Department of Mechanical Engineering,
POSTECH
, Pohang, Gyungbuk 790-784, Republic of Korea
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Moo Hwan Kim
Moo Hwan Kim
Professor
Department of Mechanical Engineering,
e-mail: mhkim@postech.ac.kr
POSTECH
, Pohang, Gyungbuk 790-784, Republic of Korea
Search for other works by this author on:
Hyungdae Kim
Department of Nuclear Engineering,
Kyung Hee University
, Yongin-city 446-701, Republic of Koreae-mail: hdkims@khu.ac.kr
Ho Seon Ahn
Department of Mechanical Engineering,
POSTECH
, Pohang, Gyungbuk 790-784, Republic of Korea
Moo Hwan Kim
Professor
Department of Mechanical Engineering,
POSTECH
, Pohang, Gyungbuk 790-784, Republic of Koreae-mail: mhkim@postech.ac.kr
J. Heat Transfer. Jun 2010, 132(6): 061501 (11 pages)
Published Online: March 25, 2010
Article history
Received:
April 7, 2009
Revised:
October 2, 2009
Online:
March 25, 2010
Published:
March 25, 2010
Citation
Kim, H., Ahn, H. S., and Kim, M. H. (March 25, 2010). "On the Mechanism of Pool Boiling Critical Heat Flux Enhancement in Nanofluids." ASME. J. Heat Transfer. June 2010; 132(6): 061501. https://doi.org/10.1115/1.4000746
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