【摘要】 以液膜质量、动量和能量守恒方程为基础提出了一个高温颗粒在冷却剂中运动的瞬态理论模型。由于高温颗粒在冷却剂中运动的瞬态复杂性,利用适合于求解大条件数的Gear算法对该模型进行了数值模拟。求解过程中采用自适应技术处理高温颗粒在冷却剂中运动时周围蒸汽膜不断变动的动边界问题,得到高温颗粒下落速度的理论计算值,并与实验值进行比较,得到了蒸汽膜的温度、厚度以及作用力等瞬态数值模拟结果。更多还原

【Abstract】 This study considers the coupling effect between film boiling heat transfer and evaporation drag around a hot-particle in cold liquid.Taking momentum and energy equations of the vapor film into ac-count,a transient single particle model under FCI conditions has been established.The numerical simulations on a high-temperature particle moving in coolant have been performed using Gear algorithm.Adaptive dy-namic boundary method is adopted during simulating to matching the dynamic boundary that is caused by vapor film changing.Based on the method presented above,the transient process of high-temperature particles moving in coolant can be simulated.The experimental results prove the validity of the HPMC model.更多还原