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原文传递 Enhancement of Heat Transfer with Pool and Spray Impingement Boiling on Microporous and Nanowire Surface Coatings

题名：	Enhancement of Heat Transfer with Pool and Spray Impingement Boiling on Microporous and Nanowire Surface Coatings
作者：	King, C.;Narumanchi, S.;Yang, R.;Wang, W.;Thiagarajan, S. J.;
关键词：	ELECTRIC DRIVE THERMAL MANAGEMENT; THERMAL INTERFACE MATERIALS; MICROPOROUS COATINGS; VEHICLE POWER ELECTRONICS; TWO-PHASE FLOWS; HYBRID ELECTRIC VEHICLES; Transportation25 ENERGY STORAGE; 33 ADVANCED PROPULSION SYSTEMS; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALTERNATING CURRENT; BOILING; COPPER; CRITICAL HEAT FLUX; DIRECT CURRENT; FLOW RATE; HEAT TRANSFER; IMPINGEMENT; MANAGEMENT; NATIONAL RENEWABLE ENERGY LABORATORY; POWER DENSITY; SURFACE COATING; VIABILITY; WORKING FLUIDS
摘要：	The DOE National Renewable Energy Laboratory (NREL) is leading a national effort to develop next-generation cooling technologies for hybrid vehicle electronics. The goal is to reduce the size, weight, and cost of power electronic modules that convert direct current from batteries to alternating current for the motor, and vice versa. Aggressive thermal management techniques help to increase power density and reduce weight and volume, while keeping chip temperatures within acceptable limits. The viability of aggressive cooling schemes such as spray and jet impingement in conjunction with enhanced surfaces is being explored. Here, we present results from a series of experiments with pool and spray boiling on enhanced surfaces, such as a microporous layer of copper and copper nanowires, using HFE-7100 as the working fluid. Spray impingement on the microporous coated surface showed an enhancement of 100%-300%in the heat transfer coefficient at a given wall superheat with respect to spray impingement on a plain surface under similar operating conditions. Critical heat flux also increased by 7%-20%, depending on flow rates.
报告类型：	科技报告