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The effect of surface area on pool boiling heat transfer coefficient and CHF of Al2O3/water nanofluids

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Abstract

In this study, pool-boiling experiments are carried out to find out the influence of nanoparticles on boiling heat transfer coefficient and CHF. Each surface of the heater is visualized with FE-SEM and AFM after the experiments to figure out the effective boiling areas. The CHF increases up to 103% (compared to pure water) as the particle concentration increases until 0.001 vol% while it starts to decrease gradually as the particle concentration increases more than 0.001 vol%. It is found that the increase of CHF is proportional to the effective boiling surface area and the reduction of boiling heat transfer coefficient (BHTC) is mainly attributed to the blocking of the active nucleation cavity and the increase of the heat transfer resistance by nanoparticle deposition on the boiling surface. Finally, this study proposes a novel mechanism for BHTC reduction and CHF enhancement by nanofluids by considering the effective surface area variation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kyung Hee University, Seoul, Korea

    Eung Surk Kim & Yong Tae Kang

  2. Maritime and Ocean Engineering and Research Institute, Korea Institute of Ocean Science and Technology, Daejeon, 305-343, Korea

    Jung-Yeul Jung

Authors
  1. Eung Surk Kim
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  2. Jung-Yeul Jung
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  3. Yong Tae Kang
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Corresponding author

Correspondence to Yong Tae Kang.

Additional information

Recommended by Editor Haecheon Choi

Jung-Yeul Jung received his B.S., M.S. degrees, and Ph.D. in Mechanical Engineering from Chung-Ang University in 2001, 2003 and 2007, respecttively. He is a senior researcher of Korea Institute of Ocean Science and Technology (KIOST) and an associate professor of Korea Maritime University (KMU). His research interests are carbon capture and storage (CCS), heat & mass transfer, nanofluids, biosensors and heat exchangers.

Eung Surk Kim received his B.S. and M.S. degrees in Mechanical Engineering from Kyung Hee University in 2009 and 2011, respectively. Currently, he is a researcher of development & design in Hanwha engineering & construction corp. business center team. His research interests are plant basic & detail design, heat & mass transfer and design of equipment.

Yong Tae Kang received his B.S., M.S. degrees and Ph.D. in Mechanical Engineering from Seoul National University in 1987 and 1989, and The Ohio State University in 1994, respectively. Currently, he is a Professor at the Department of Mechanical Engineering, Kyung Hee University, Yongin, Korea. His research interests are CO2 absorption & regeneration, heat & mass transfer, nanofluids, heat pump and air conditioning and refrigeration.

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Kim, E.S., Jung, JY. & Kang, Y.T. The effect of surface area on pool boiling heat transfer coefficient and CHF of Al2O3/water nanofluids. J Mech Sci Technol 27, 3177–3182 (2013). https://doi.org/10.1007/s12206-013-0839-7

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  • DOI: https://doi.org/10.1007/s12206-013-0839-7

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