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http://dx.doi.org/10.3795/KSME-B.2016.40.6.383

Pool Boiling Characteristics on the Microstructured surfaces with Both Rectangular Cavities and Channels  

Kim, Dong Eok (Dept. of Precision Mechanical Engineering, Kyungpook Nat'l Univ.)
Park, Su Cheong (Dept. of Mechanical Engineering, POSTECH)
Yu, Dong In (Div. of Advanced Nuclear Engineering, POSTECH)
Kim, Moo Hwan (Korea Institute of Nuclear Safety(KINS))
Ahn, Ho Seon (Div. of Mechanical System Engineering, Incheon Nat'l Univ.)
Myung, Byung-Soo (Dept. of Precision Mechanical Engineering, Kyungpook Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.40, no.6, 2016 , pp. 383-389 More about this Journal
Abstract
Based on a surface design with rectangular cavities and channels, we investigated the effects of gravity and capillary pressure on pool-boiling Critical Heat Flux (CHF). The microcavity structures could prevent liquid flow by the capillary pressure effect. In addition, the microchannel structures contributed to induce one-dimensional liquid flow on the boiling surface. The relationship between the CHF and capillary flow was clearly established. The driving potentials for the liquid supply into a boiling surface can be generated by the gravitational head and capillary pressure. Through an analysis of pool boiling and visualization data, we reveal that the liquid supplement to maintain the nucleate boiling condition on a boiling surface is closely related to the gravitational pressure head and capillary pressure effect.
Keywords
Critical Heat Flux; Micro-structured Surface; Gravity Pressure Head; Capillary Pressure;
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