Ultra-low pressure drop membrane-based heat sink with 1000 W/cm2 cooling capacity and 100% exit vapor quality

Alipanah, Morteza; Moghaddam, Saeed

doi:10.1016/j.ijheatmasstransfer.2020.120312

Cited by 13 publications

(21 citation statements)

References 36 publications

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“…As evidenced in fig. 5, a marked increase in CHF is observed with an increase in surface area as well as device pressure, consistent with our prior studies [38]. The yellow band in fig.…”

Section: Uncertainty Analysissupporting

confidence: 91%

“…5 denotes the maximum heat flux limit for a given device pressure based on membrane permeability. Consistent with results obtained at atmospheric pressure [37,38,40], above a certain pressure (∼2 kPa), CHF is not limited by the membrane permeability, but by surface properties. It can also be inferred from fig.…”

Section: Uncertainty Analysissupporting

confidence: 88%

“…Hence, we expect to see an increase in CHF with an increase in ∆P . Further, an increase in A r is known to increase CHF [37,38]. As evidenced in fig.…”

Section: Uncertainty Analysismentioning

confidence: 90%

“…This method of manipulating vapor discharge is shown to enhance multiple performance characteristics during boiling. For example, in addition to dissipating heat fluxes greater than one order of magnitude [37,38] above the Kutateladze [39] and Zuber [25] limit (119 W/cm 2 for a copper surface), rapid expulsion of vapor from the liquid pool greatly lowers two-phase pressure drop relative to conventional heat sinks [40].…”

Section: Mhs Operating Principlementioning

confidence: 99%

“…We have coined the term Membrane assisted phase-change Heat Sinks (MHS) for this technology. Earlier demonstration of the device performance has shown unprecedented heat flux dissipations of 1-2 kW/cm 2 , depending on MHS design and operating conditions, with water at atmospheric pressure [37,38], offering a promising alternative to conventional heat sinks at conditions relevant to DCs. In this study, we evaluate boiling performance of MHS at a sub-ambient pressure of 16 kPa.…”

Section: Introductionmentioning

confidence: 99%

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Data center energy efficiency enhancement using a two-phase heat sink with ultra-high heat transfer coefficient

Tamvada¹,

Moghaddam²

2022

Preprint

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This paper presents the latest progress on characterization of our membrane assisted phase-change heat sink (MHS) at conditions suitable for implementation in data centers (DCs). Experiments are conducted using water as the working fluid at a vapor space pressure (P vapor ) of 16 kPa, corresponding to a saturation temperature of ∼ 55 • C. This temperature is sufficiently lower than the silicon junction temperature of 80 • C. As anticipated, the overall performance of MHS at sub-atmospheric pressure is lower compared to analogous tests at atmospheric pressure. In agreement with previous studies on MHS, the critical heat flux limit (CHF) increases with enhancement of the heat transfer area ratio (A r ) and liquid space pressure (P pool ). We report a maximum CHF of 670 W/cm 2 on a surface with an enhanced area ratio of 3.45, multiple times greater than the CHF reported hitherto by a comparable two-phase heat sink in literature. Heat transfer coefficients (HTC) as high as ∼ 1 MW/m 2 -K are obtained. These record performance data along with unique characteristics of the MHS promise to greatly benefit next generation highly energy efficient DCs.

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“…As evidenced in fig. 5, a marked increase in CHF is observed with an increase in surface area as well as device pressure, consistent with our prior studies [38]. The yellow band in fig.…”

Section: Uncertainty Analysissupporting

confidence: 91%

Section: Uncertainty Analysissupporting

confidence: 88%

“…Hence, we expect to see an increase in CHF with an increase in ∆P . Further, an increase in A r is known to increase CHF [37,38]. As evidenced in fig.…”

Section: Uncertainty Analysismentioning

confidence: 90%