Enhanced Flow Boiling of Ethanol in Open Microchannels With Tapered Manifolds in a Gravity-Driven Flow

作     者：Buchling, Philipp Kandlikar, Satish 

作者机构：Rochester Inst Technol Dept Mech Engn Lomb Mem Dr Rochester NY 14623 USA 

出 版 物：《JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME》 (美国机械工程师学会汇刊: 传热杂志)

年 卷 期：2016年第138卷第3期

页      面：031503-031503页

核心收录：

学科分类：080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 

基　　金：National Science Foundation [CBET-1236062] 

主　　题：open microchannels OMM tapered manifolds flow boiling electronics cooling gravity-driven flow low pressure drop ethanol 

摘      要：There is a clear need for cooling high heat flux generating electronic devices using a dielectric fluid without using a pump. This paper explores the feasibility of employing ethanol as a dielectric fluid in a horizontal, open microchannel heat sink configuration with a tapered gap manifold to yield very low pressure head requirements. The paper presents experimental results for such a system utilizing ethanol as a working fluid under gravity-driven flow. A heat flux of 217 W/cm(2) was dissipated with a pressure drop of only 9 kPa. The paper further presents parametric trends regarding flow rate and pressure drop characteristics that provide basic insight into designing high heat flux systems under a given gravity head requirement. Based on the results, interrelationships and design guidelines are developed for the taper, ethanol flow rate and imposed heat flux on heat transfer coefficient and gravity head requirement for electronics cooling. Reducing flow instability, reducing pressure drop, and enhancing heat transfer performance for a dielectric fluid will enable the development of pumpless cooling solutions in a variety of electronics cooling applications.