Electrohydrodynamic Conduction Pumping Driven Liquid Film Flow Boiling on Bare and Nanofiber Enhanced Surfaces

Abstract

Liquid film flow boiling heat transfer driven by electrohydrodynamic (EHD) conduction pumping is experimentally studied on a surface with a novel metalplated nanofibermat coating. The nanotextured surface is formed on a copper substrate covered by an electrospun polymer nanofiber mat, which is copperplated as a postprocess. The mat has a thickness of about 30 خ¼m and is immersed in saturated HCFC123. The objective is to study electrowetting of the copperplated nanofiberenhanced surface via EHD conduction pumping mechanism for the entire liquid film flow boiling regime leading up to critical heat flux (CHF), and compare it to the bare surface without EHDdriven flow. The results show that with the combination of these two techniques, for a given superheat value, enhancement in heat flux and boiling heat transfer coefficient is as high as 555% compared to the bare surface. The results are quite promising for thermal management applications.