关键词: 相变微胶囊悬浮液, 随机轨道模型, 相变潜热, 传热

Abstract: A CFD-DPM model was used to study the characteristics of turbulent flow and heat transfer for microencapsulated phase change material slurry (Micro-PCMS) in a 3D mini-pipe at constant heat flux. The effect of Micro-PCM mass fraction on velocity and temperature of Micro-PCMS, and wall temperature was examined. Along the flowing direction, the parameters of velocity, temperature and correctional Nu number are obtained on the different cross sections. The results show that the slurry velocity near pipe wall decreases because of Micro-PCM particles, and the decrease is more obvious with the increase of content of Micro-PCM particles. Three apparent regions of non-melting region, melting region and melted region present in pipe are divided for Micro-PCMS. The pipe wall temperature and outlet temperature of the slurry are lower than those of pure water. Under three Micro-PCM mass fractions of 12%, 16% and 20%, the slurry outlet temperature is reduced by 25.5%, 33.9% and 42.4%, and the pipe wall temperature 23.9%, 31.0% and 39.2%, compared with pure water. Because of the common effect of phase change heat absorption and particle disturbance, the slurry temperature field distribution changes from regular parabola to leptokurtic curve.

Key words: microencapsulated phase change material slurry, stochastic trajectory model, phase change latent heat, heat transfer