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http://dx.doi.org/10.3795/KSME-B.2011.35.8.831

Design of Stable Evaporative Micro-channel Systems Using Expanding Area  

Lee, Hee-Joon (School of Mechanical Systems Engineering, Kookmin Univ.)
Yao, Shi-Chune (Dept. of Mechanical Engineering, Carnegie Mellon Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.8, 2011 , pp. 831-838 More about this Journal
Abstract
A growing bubble can be squeezed for water, and it will then encounter flow instability, which reverses toward upstream in straight micro-channels. To reduce the flow instability, a micro-channel that expands at the downstream end has been found to be effective. In the expanding area, a growing bubble will tend to move downstream because the net surface tension force of a vapor-liquid interface is inversely proportional to the local radius of curvature. We propose a static flow instability model and validate it experimentally. Moreover, we apply the local-instability parameter concept to the real design of a stable evaporative micro-channel with an expanding area. Based on the localinstability model, we establish a static design for stable expanding evaporative micro-channels.
Keywords
Flow Instability; Expanding Area; Evaporation; Micro-channel; Stable Design;
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