Experimental study of bubble dynamics in highly wetting dielectric liquid pool boiling through high-speed video

Abstract

An experimental investigation of pool boiling on the heat spreader lid surface of a real central processing unit (CPU) is presented in this paper. A highly wetting dielectric liquid, Novec 7100, was employed as coolant. The nucleate boiling process was observed and recorded through a high-speed camera. The boiling curves of saturated Novec 7100 liquid on the CPU heat spreader lid were obtained. The quantities used to characterize bubble dynamics, such as active nucleation site density, bubble departure diameter and bubble departure frequency, were measured through the high-speed video at different wall heat fluxes. The averaged values of all these quantities have increasing trends with increasing wall heat flux. The relationships between quantities and heat flux can be further embedded into nucleate boiling heat transfer models for validation.