Experimental study of the characteristics and mechanism of pool boiling CHF enhancement using nanofluids |
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Authors: | Hyungdae Kim Moohwan Kim |
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Institution: | (1) Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Namgu, Pohang, Kyoungbuk, 790-784, South Korea |
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Abstract: | The pool boiling critical heat flux (CHF) performance of aqueous nanofluids was investigated using various nanoparticles of
TiO2, Al2O3, and SiO2. The usage of a nanofluid as a working fluid can significantly enhance the pool boiling CHF, which was found to be strongly
dependent on the kind of nanoparticle, as well as its concentration. A nanoparticle surface coating was observed on the heating
surface after the experiment. The CHF of pure water on the nanoparticle-coated surface was higher than that of nanofluids
for all cases. This revealed that the cause of the CHF enhancement using nanofluids is due to the fact that the heater surface
is modified by the nanoparticle deposition. The mechanism of CHF enhancement due to the nanoparticle coating was discussed,
relating it to surface wettability, surface roughness, and maximum capillary wicking height of the nanoparticle-coated surface. |
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Keywords: | |
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