A remarkable CHF of 345W/cm2 is achieved in a wicked-microchannel using HFE-7100

Li, Wenming; Luo, Kai; Li, Chen; Joshi, Yogendra

doi:10.1016/j.ijheatmasstransfer.2022.122527

A remarkable CHF of 345W/cm² is achieved in a wicked-microchannel using HFE-7100

Journal Article · Mon Jan 17 23:00:00 EST 2022 · International Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2022.122527· OSTI ID:1977196

Li, Wenming ^[1]; Luo, Kai ^[2]; Li, Chen ^[2]; Joshi, Yogendra ^[3]

Southeast Univ., Nanjing (China). School of Energy and Environment; Georgia Institute of Technology, Atlanta, GA (United States); OSTI
Univ. of South Carolina, Columbia, SC (United States)
Georgia Institute of Technology, Atlanta, GA (United States)

Boiling heat transfer of dielectric fluids is a promising cooling technique for thermal management of microelectronic systems. However, the critical heat flux achievable is generally low, because of the poor thermophysical properties of these fluids. Here, to address this dilemma, we propose a new cooling concept to substantially enhance global liquid supply during phase-change process using enhanced capillary-driven force. Additionally, dedicated vapor pathways are designed among a bank of micro-pillars to facilitate vapor removal. In this work, new wicks comprised of silicon micro-pinfin arrays are explored to significantly enhance the flow boiling heat transfer performance. To examine the functionalities of this wick, experiments on HFE-7100 were carried out with mass velocities varying from 247 to 3,465 kg/m²s. To explore the enhancement mechanisms and to analyze the capillary-assisted flow boiling process, visualization studies were conducted. The results indicate that sustainable evaporation induced by wick microstructures and efficient liquid supply are the enhancement mechanisms compared to parallel microchannels with solid walls. It is found that the overall heat transfer coefficient is substantially increased up to 75%. Remarkably, a high critical heat flux (CHF) of approximately 345 W/cm² is recorded at G = 3,465 kg/m²s at coolant inlet temperature of ~20 °C. Equally importantly, this noticeable enhancement of CHF value is associated with drastically decreased pressure drops compared to microchannels decorated with μ-pinfin fences.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0001023

OSTI ID:: 1977196

Alternate ID(s):: OSTI ID: 1841067

Journal Information:: International Journal of Heat and Mass Transfer, Journal Name: International Journal of Heat and Mass Transfer Journal Issue: C Vol. 187; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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