Spray cooling is an efficient cooling method with high heatflux removal capability. In this study, we propose a spray cooling regime with nanoencapsulated phase-change material slurry (NPCMS), aiming to improve the coolant's heat capacity. We develop a three-dimensional model of spray cooling of NPCMS based on DPM and Lagrangian Wall Film (LWF) models. Also, the equivalent heat capacity method is integrated in LWF model to characterize the solid-liquid phase change of NPCMS. In addition, the experiment of spray cooling of NPCMS is conducted to verify our model. The influences of initial temperature of NPCMS and dynamic properties on flow and heat transfer of NPCMS are discussed. The results show that NPCMS greatly improves the heat transfer coefficient within the phase-change temperature range, especially the coefficient at the stagnation point of heated surface, but reduces the uniformity of heat transfer. The optimal heat transfer performance occurs when the initial temperature of NPCMS is 301 K, 0.9 K lower than the peak temperature of phase change. The heat transfer coefficient at the center of wall is almost twice of that of the water due to latent heat absorption. Lower surface tension and viscosity are beneficial to improving spray cooling performance.

喷雾冷却是一种高效的冷却方法，具有很高的热通量去除能力。在这项研究中，我们提出了一种采用纳米封装相变材料浆料（NPCMS）的喷雾冷却方案，旨在提高冷却剂的热容量。我们基于DPM和拉格朗日墙膜（LWF）模型开发了NPCMS喷雾冷却的三维模型。此外，当量热容方法被集成到LWF模型中以表征NPCMS的固液相变。此外，还进行了NPCMS喷雾冷却实验以验证我们的模型。讨论了NPCMS的初始温度和动力学性质对NPCMS流动和传热的影响。结果表明，NPCMS在相变温度范围内大大提高了传热系数，尤其是在受热表面停滞点处的系数，但会降低传热的均匀性。当NPCMS的初始温度为301 K，比相变的峰值温度低0.9 K时，会发生最佳的传热性能。由于潜热的吸收，壁中心的传热系数几乎是水的两倍。较低的表面张力和粘度有利于改善喷雾冷却性能。