Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 91, Issue -, Pages 1140-1147Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2015.07.120
Keywords
Boiling heat transfer; Critical heat flux; Microstructure surface
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Funding
- BK21+ program through the National Research Foundation of Korea - Ministry of Education, Science and Technology
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [NRF-2013M2A8A1040987]
- Nuclear Safety Research Program of the Korea Radiation Safety Foundation - Korean government (NSSC) [1305008-0113-HD140]
- National Research Foundation of Korea [2013M2A8A1040987] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We study the effectiveness of microstructured surfaces in enhancing the boiling heat transfer (BHT) and critical heat flux (CHF). A set of experiments is designed with thirteen prepared samples: twelve with a microstructured surface, and one with a bare surface. The samples are fabricated using microelectrome-chanical systems (MEMS) techniques. The samples are tested using pool boiling experiments in saturated and atmospheric pressure conditions. The experimental results show that BHT increases with the surface roughness, defined as the ratio of the rough surface area to the projected area, but this enhancement gradually slows. The heat transfer coefficient of the structured surface is more than 300% that of the bare surface. The increase in the heating surface area due to the roughness ratio improves nucleate BHT due to the enhancement of convective heat transfer. The structured surface shows a 350% improvement in CHF over the bare surface. However, through analysis of the capillary flow rate on the structured surface, a critical gap size that limits the CHF is found. The critical gap size is discussed analytically and compared with experimental data. Designs for optimal boiling performance are proposed by studying the role of microstructured surfaces in both BHT and CHF. (C) 2015 Elsevier Ltd. All rights reserved.
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