Effect of inclination on saturation boiling of PF-5060 dielectric liquid on 80- and 137-μm thick copper micro-porous surfaces

abstract Investigated is the effect of inclination, from 0 (upward facing) to 180 (downward facing), on saturationnucleate boiling of degassed PF-5060 dielectric liquid on two Cu micro-porous surfaces measuring10 10 mm, and 80- and 197- m m thick. These surfaces, deposited by electrochemical processes on Cusubstrates of the same footprint area and 1.6 mm thick, are heated uniformly in the experiments. Thehigh volume porosityand morphology of the surfaces enhance nucleate boiling by increasing the bubblesnucleation sites density and the wetted surface area. The measured CHF values and those of themaximum nucleate boiling heat transfer coefficient, h MNB , are much higher than measured on plane Cuand decrease monotonically with increased surface inclination to their lowest values in the downwardfacing orientation (180 ). The 197- m m thick micro-porous surface gives the largest enhancements in CHFand h MNB . 2011 Elsevier Masson SAS. All rights reserved. 1. IntroductionThe potential of immersion nucleate boiling of dielectric liquidshas been recognized as an effective means for cooling high powercomputer chips or Dies with a surface average dissipation heat fluxup to 100 W/cm

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