Pumped-loop liquid-cooled system involving phase-change (two-phase) is a promising technology for removing excess heat from high-density electronics. However, no consensus has been reached so far regarding the hydraulic and heat transfer characteristics of such two-phase (TP) micro flow passages with hydraulic diameters (Dh) on the order of several hundred micrometers or smaller. In a previous paper [Tong et al., ASME IMECE2007-42027], we reported flow boiling experiments for several microchannel (MC) cold plate devices with channel widths ranging from 61 to 340 μm (hydraulic diameters from 100 to 337 μm) and a micro-pin-fin array (μPFA) device. Two working fluids, deionized water and HFE-7100, were tested respectively. In this paper, we focus on the highspeed visualization study of the phase-change phenomena inside the MC cold plates. Features of the major TP flow patterns are discussed for each MC unit with varying sizes and with the two different working fluids. From direct visualization, we report the liquid thin film evaporation rate for the pulsating annular flow regions in MCs. The observed liquid film evaporation rate is much higher than previous predictions/assumptions from a steady-state annular flow picture as assumed by most theoretical investigations so far. The local transient heat flux is thus much higher than the average heat flux provided, especially for water and small hydraulic diameter MCs.
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ASME 2007 International Mechanical Engineering Congress and Exposition
November 11–15, 2007
Seattle, Washington, USA
Conference Sponsors:
- ASME
ISBN:
0-7918-4299-1
PROCEEDINGS PAPER
High-Speed Visualization of Phase-Change Processes in Silicon Microchannels With Water and HFE-7100 as Working Fluids
Je-Young Chang,
Je-Young Chang
Intel Corporation, Chandler, AZ
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Shankar Devasenathipathy,
Shankar Devasenathipathy
Intel Corporation, Chandler, AZ
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Suzana Prstic,
Suzana Prstic
Intel Corporation, Chandler, AZ
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Ravi Prasher
Ravi Prasher
Intel Corporation, Chandler, AZ
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Tao Tong
Intel Corporation, Chandler, AZ
Je-Young Chang
Intel Corporation, Chandler, AZ
Shankar Devasenathipathy
Intel Corporation, Chandler, AZ
John Dirner
Intel Corporation, Chandler, AZ
Suzana Prstic
Intel Corporation, Chandler, AZ
Ravi Prasher
Intel Corporation, Chandler, AZ
Paper No:
IMECE2007-42028, pp. 111-120; 10 pages
Published Online:
May 22, 2009
Citation
Tong, T, Chang, J, Devasenathipathy, S, Dirner, J, Prstic, S, & Prasher, R. "High-Speed Visualization of Phase-Change Processes in Silicon Microchannels With Water and HFE-7100 as Working Fluids." Proceedings of the ASME 2007 International Mechanical Engineering Congress and Exposition. Volume 5: Electronics and Photonics. Seattle, Washington, USA. November 11–15, 2007. pp. 111-120. ASME. https://doi.org/10.1115/IMECE2007-42028
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