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Coatings 2018, 8(8), 288; https://doi.org/10.3390/coatings8080288

Optimal Patterned Wettability for Microchannel Flow Boiling Using the Lattice Boltzmann Method

School of Mechanical Engineering, Yonsei University, Seoul 03722, Korea
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Received: 22 May 2018 / Revised: 28 July 2018 / Accepted: 5 August 2018 / Published: 17 August 2018
(This article belongs to the Special Issue Superhydrophobic Coatings)
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Abstract

Microchannel flow boiling is a cooling method studied in microscale heat-cooling, which has become an important field of research with the development of high-density integrated circuits. The change in microchannel surface characteristics affects thermal fluid behavior, and existing studies have optimized heat transfer by changing surf ace wettability characteristics. However, a surface with heterogeneous wettability also has the potential to improve heat transfer. In this case, heat transfer would be optimized by applying the optimal heterogeneous wettability surface to channel flow boiling. In this study, a change in cooling efficiency was observed, by setting a hydrophobic and hydrophilic wettability pattern on the channel surface under the microchannel flow boiling condition, using a lattice Boltzmann method simulation. In the rectangular microchannel structure, the hydrophobic-hydrophilic patterned wettability was oriented perpendicular to the flow direction. The bubble nucleation and the heat transfer coefficient were observed in each case by varying the length of the pattern and the ratio of the hydrophobic-hydrophilic area. It was found that the minimum pattern length in which individual bubbles can occur, and the wettability pattern in which the bubble nucleation-departure cycle is maintained, are advantageous for increasing the efficiency of heat transfer in channel flow boiling. View Full-Text
Keywords: flow boiling; patterned wettability; microchannel flow; lattice Boltzmann method flow boiling; patterned wettability; microchannel flow; lattice Boltzmann method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wi, Y.J.; Kim, J.H.; Lee, J.S.; Lee, J.S. Optimal Patterned Wettability for Microchannel Flow Boiling Using the Lattice Boltzmann Method. Coatings 2018, 8, 288.

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