TWO-PHASE HEAT TRANSFER ASSEMBLIES AND POWER ELECTRONICS MODULES INCORPORATING THE SAME

摘要

A two-phase heat transfer assembly includes a cold plate having an impingement surface, an array of heat generating device coupled to the cold plate, and an array of spray nozzles. The impingement surface has an array of central hydrophilic regions. Each individual central hydrophilic region is surrounded by a hydrophobic perimeter. A wettability of the impingement surface gradually progresses from hydrophilic at each individual central hydrophilic region to hydrophobic at each hydrophobic perimeter. The array of heat generating devices is coupled to a heated surface of the cold plate such that the array of central hydrophilic regions is aligned with the array of heat generating devices. The array of spray nozzles is configured to direct coolant droplets toward the impingement surface. The wettability profile of the impingement surface of the cold plate causes the coolant droplets to move inwardly toward the individual central hydrophilic regions from each hydrophobic perimeter.