This paper, for the ®rst time, experimentally elucidated pin ®n boiling characteristics of saturated and subcooled HFE-7100, a CFC-substitute, under atmospheric pressure. Fin base temperature and heat ¯ux data are, for the ®rst time, measured along with the ®n tip temperature. For a given liquid/®n combination there exist upper steady-state (USS) branch, lower steady-state (LSS) branch, and a large, unstable regime located in between the two branches. Zones with dierent stability characteristics are mapped according to boiling on ®ns with dierent aspect ratios. Liquid subcooling enhances heat transfer performance and boiling stability. Calculation of boiling curve qualitatively describes the experimental results.

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