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基于一种潜热相变材料微胶囊非牛顿流体,填充在储热密闭矩形容器内下面加热上面冷却,其余各面绝热的条件为研究对象,通过数值模拟方法,对其相变化过程的自然对流热传递进行理论分析。为了确定相变材料的影响,对含有与不含相变材料微胶囊流体的传热过程进行数值对比计算。其潜热相变材料微胶囊非牛顿流体特性为:该流体在高质量浓度的相变化过程中,比热随温度急剧变化,同时,表现出拟塑性非牛顿流体特性,拟塑性流体的幂指数n=0.9。研究结果表明:该相变材料微胶囊流体,在相变过程中,加速了自然对流的启动,增强了其自然对流的强度,从而提高了其热传递效率;非牛顿流体促进了自然对流的发生。
Based on a latent heat phase change material microcapsule non-Newtonian fluid, filled in a heat-sealed airtight container, heated under the above cooling, the other conditions of the adiabatic conditions for the study, by numerical simulation of its phase change process of natural convection heat Transmission for theoretical analysis. In order to determine the effect of phase change material, the numerical calculation of the heat transfer of microcapsules with and without phase change material was carried out. The non-Newtonian fluid properties of the latent phase change material microcapsules are as follows: the specific heat rapidly changes with temperature during the phase change of high-mass concentration, and at the same time, it exhibits the properties of pseudoplastic non-Newtonian fluid, the power exponent n = 0.9. The results show that the phase change material microcapsule fluid accelerates the start of natural convection and enhances the natural convection strength during the phase transition, so as to improve the heat transfer efficiency. The non-Newtonian fluid promotes the natural convection .