Subcooled Boiling of PF-5060 Dielectric Liquid on Microporous Surfaces

摘要

Presented are the results of experiments that investigated nucleate boiling of PF-5060 on microporous Cu surface layers at saturation and 10 K, 20 K, and 30 K subcooling. The three microporous layers, electrochemically deposited on 10 ×10 mm~2 Cu substrates and investigated herein, are —139 μm, 171 μm, and 220 μm thick. The critical heat flux increases linearly with increased subcooling, ΔT_(sub), at an average rate of 4.5%/K. For the 171 fim thick, Cu microporous surface, saturation boiling CHF of 27.8 W/cm~2 increases to 63.25 W/cm~2 at ΔT_(sub) =30 K, while the saturation h_(MNB) of 13.5 W/cm~2 K decreases slightly to 12.7 W/cm~2 K at ΔT_(sub)=30 K. The values of the surface superheat, ΔT_(sub), at h_(MNB) and CHF increase from 2.0 K and 2.16 K at saturation to 4.2 and 6.42 K at 30 K subcooling.