Abstract: Based on the theory of ultrasonic atomization and focused ultrasound， a spherical focused ultrasound assisted ultrasonic atomizing cooling system was proposed to use for precision grinding.The ultrasonic atomization was used as a cooling method， at the same time， the mists were converged to the specified heat positions by focused ultrasound to increase the utilization rates of mists.With the use of Fluent numerical simulation and steady state heat transfer experiments under the conditions of plane heat sources， the effects of focused mists and focused ultrasound on the heat transfer performances of the focused ultrasound assisted ultrasonic atomizing cooling system were analyzed.The results show that when the specimens are located in the focal area of the focused mists， the heat transfer performances of the focused mists are the best， the surface temperature of specimens is the lowest.Moreover， focused ultrasound may help to strengthen the heat transfers in the central areas，and further improve the heat transfer performances of the focused ultrasound assisted ultrasonic atomizing cooling systems.

Key words: ultrasonic atomization, focused mist, focused ultrasound, mist cooling

摘要： 基于超声雾化理论和超声聚焦理论，提出了一种应用于精密磨削加工中的球面聚焦超声汽雾冷却系统，在使用超声雾化作为冷却方式的同时，利用聚焦超声将汽雾汇聚到指定的换热位置，以提高汽雾的利用率。利用Fluent软件数值模拟和平面热源条件下稳态换热试验分析了聚焦汽雾和聚焦超声对聚焦超声汽雾冷却系统换热特性的影响。结果表明，当试件位于汽雾焦区时，聚焦汽雾的换热性能最佳，试件表面温度最低；同时，聚焦超声有助于强化中心区汽雾换热，进一步提高聚焦超声汽雾冷却系统的换热能力。

关键词: 超声雾化, 聚焦汽雾, 聚焦超声, 汽雾冷却