To What Extent Can Complex Two‐Phase Transport Be Manipulated at Micro/Nanoscale? - Chen Li
From Katie Gentilello on February 28th, 2017
Two-phase transport is promising in addressing the cooling challenges facing high power microelectronics. Through evaporation of latent heat, two-phase heat transfer can enable a uniform temperature field under high working heat flux conditions along with a reduced pumping power, which is highly desirable to realize highly effective direct cooling or to integrate two-phase microchannel cooling for future high power electronics. However, it is extremely challenging owing to the fact that two-phase transport performance is primarily governed and also limited by the detrimental aspects of complex two-phase flow in conventional channels. Two-phase transport at micro/nanoscale becomes more unpredictable due to the unfavorable size effects. Over the past decade, extensive progress has been made in understanding two-phase transport on various microchannel designs and configurations. It has been driven by the intrinsic scientific interest and needs of emerging applications to realize a favorable control of complex two-phase flows. Most recently, Dr. Li’s group has devised several novel micro/nanoscale fluidic control methods. Through designing novel micro/nanoscale structures, these methods can (a) passively generate sustainable and on-demand mixing in the laminar flow regime in microchannels, or (b) intentionally reduce transitional twophase flow regimes into a single and favorable flow regime for better heat transfer performance and flow characteristics, or (c) even reconstruct boundary layers to select and promote favorable two-phase flow structure and heat transfer modes during flow boiling in microchannels. Drastic enhancements have been demonstrated. In this talk, Dr. Li would like to share his recent progress in understanding these micro/nanoscale fluidic control methods.