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Micromachines 2017, 8(1), 3; doi:10.3390/mi8010003

Single-Sided Digital Microfluidic (SDMF) Devices for Effective Coolant Delivery and Enhanced Two-Phase Cooling

1
Department of Mechanical Engineering, National University of Singapore, Block EA, #07-08, 9 Engineering Drive 1, Singapore 117576, Singapore
2
Department of Mechanical Engineering, Kyung Hee University, 1732 Deokyoungdaero, Yongin 17104, Korea
*
Authors to whom correspondence should be addressed.
Academic Editors: Wang Wei, Chia-Hung Chen and Zhigang Wu
Received: 18 October 2016 / Revised: 28 November 2016 / Accepted: 20 December 2016 / Published: 24 December 2016
(This article belongs to the Special Issue Optofluidics 2016)
View Full-Text   |   Download PDF [1857 KB, uploaded 26 December 2016]   |  

Abstract

Digital microfluidics (DMF) driven by electrowetting-on-dielectric (EWOD) has recently been attracting great attention as an effective liquid-handling platform for on-chip cooling. It enables rapid transportation of coolant liquid sandwiched between two parallel plates and drop-wise thermal rejection from a target heating source without additional mechanical components such as pumps, microchannels, and capillary wicks. However, a typical sandwiched configuration in DMF devices only allows sensible heat transfer, which seriously limits heat rejection capability, particularly for high-heat-flux thermal dissipation. In this paper, we present a single-sided digital microfluidic (SDMF) device that enables not only effective liquid handling on a single-sided surface, but also two-phase heat transfer to enhance thermal rejection performance. Several droplet manipulation functions required for two-phase cooling were demonstrated, including continuous droplet injection, rapid transportation as fast as 7.5 cm/s, and immobilization on the target hot spot where heat flux is locally concentrated. Using the SDMF platform, we experimentally demonstrated high-heat-flux cooling on the hydrophilic-coated hot spot. Coolant droplets were continuously transported to the target hot spot which was mitigated below 40 K of the superheat. The effective heat transfer coefficient was stably maintained even at a high heat flux regime over ~130 W/cm2, which will allow us to develop a reliable thermal management module. Our SDMF technology offers an effective on-chip cooling approach, particularly for high-heat-flux thermal management based on two-phase heat transfer. View Full-Text
Keywords: digital microfluidics; electrowetting; droplets; micro-scale cooling digital microfluidics; electrowetting; droplets; micro-scale cooling
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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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Park, S.-Y.; Nam, Y. Single-Sided Digital Microfluidic (SDMF) Devices for Effective Coolant Delivery and Enhanced Two-Phase Cooling. Micromachines 2017, 8, 3.

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