Flow boiling behaviors in hydrophilic and hydrophobic microchannels
SCIE
SCOPUS
- Title
- Flow boiling behaviors in hydrophilic and hydrophobic microchannels
- Authors
- Chiwoong Choi; Shin, JS; Dongin Yu; Kim, MH
- Date Issued
- 2011-07
- Publisher
- ELSEVIER SCIENCE INC
- Abstract
- Surface wettability is a critical parameter in small scale phenomena, especially two-phase flow, since the surface force becomes dominant as size decreases. In present study, experiments of water flow boiling in hydrophilic and hydrophobic rectangular microchannels were conducted to investigate the wettability effect on flow boiling in rectangular microchannels. The rectangular microchannels were fabricated with a photosensitive glass to visualize flow pattern. The hydrophilic bare photosensitive glass microchannel was chemically treated to obtain a hydrophobic microchannel. And, visualization of flow patterns was carried out. And boiling heat transfer and two-phase pressure drop was analyzed with visualization results. The boiling heat transfer coefficient in the hydrophobic rectangular microchannel was higher than that in the hydrophilic rectangular microchannel, which was highly related with nucleation site density and liquid film motion. And the pressure drop in the hydrophobic rectangular microchannel was higher than that in the hydrophilic rectangular microchannel, which was highly related with unstable motions of bubble and liquid film. Finally, we find out the wettability is important parameter on the flow pattern, which were highly related with two-phase heat and mass transfer. (C) 2010 Elsevier Inc. All rights reserved.
- Keywords
- Flow boiling; Microchannel; Wettability; Heat transfer; Pressure drop; HEAT-TRANSFER MODEL; CONTACT-ANGLE; 2-PHASE FLOW; EVAPORATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25576
- DOI
- 10.1016/J.EXPTHERMFLUSCI.2010.07.003
- ISSN
- 0894-1777
- Article Type
- Article
- Citation
- EXPERIMENTAL THERMAL AND FLUID SCIENCE, vol. 35, no. 5, page. 816 - 824, 2011-07
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- There are no files associated with this item.
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