Performance assessment of a closed-loop minichannel heat sink using water and FC-72 as coolants

Xiao Hu, Guiping Lin, Yan Cai, Xueqin Bu, Dongsheng Wen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


To satisfy the cooling demand from a particular space application, a closed-loop two-phase minichannel heat sink driven by a micro-gear pump was developed in this work. The cooling system was made of oxygen-free copper containing 14 parallel channels of the dimension of 0.8mm (width) × 2mm (depth)× 20mm (length). The cooling performance of FC-72 and water was evaluated by the heat transfer coefficient and the pressure drop under different conditions. The analysis shows that both coolants can be used to achieve the design criteiron, that is, a maximum heat dissipation rate of 100W/cm 2 while keeping the peak heating surface temperature below 90C. However for FC-72, the limitation is in the critical heat flux, which occurs easily under low-flow-rate conditions that deteriorates the performance of the cooling system. The comparion of boiling heat trnsfer coefficient shows that none of the compared correlations can predict both FC-72 and water data well, with the corrleation developed in 1996 by Tran, Wambsganss, and France achieving the best mean absolute error of ∼45%.

Original languageEnglish
Pages (from-to)500-510
Number of pages11
JournalHeat Transfer Engineering
Issue number5-6
StatePublished - 1 Jan 2013
Externally publishedYes


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