Pool boiling enhancement with surface treatments |
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Authors: | Yoon-Ho Kim Kyu-Jung Lee Donghyouck Han |
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Institution: | (1) Department of Mechanical Engineering, Korea University, Anam-dong, Sungbuk-ku, Seoul, 136-713, South Korea;(2) Institute of Advanced Machinery Design, Korea University, Anam-dong, Sungbuk-ku, Seoul, 136-713, South Korea |
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Abstract: | Pool boiling heat transfer characteristics on treated surfaces were investigated experimentally. Surface treatments were performed
with sandpapers, building micro structures by etching, and micro-porous coating. Copper blocks of 20 mm × 20 mm were used
as test sections and PF5060 was used as a working fluid. The effect of wall superheat (0–35 K), surface orientation (0°, 45°,
90°), and subcooling (0, 5, 10 K) on treated surfaces were also investigated. Heat transfer performance on inclined surface
was better than that of horizontal surface in all test sections. Because bubble generation was suppressed by subcooling, higher
wall superheat was needed to initiate boiling in all surfaces. Micro-porous coated surface showed the highest heat transfer
enhancement among tested surfaces. |
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Keywords: | |
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