Research for development of micro heat exchanger using heat storage microcapsule-water slurry

通过毛细管将相变颗粒微胶囊分散于水中，对蓄热微胶囊-水浆的传热特性进行了实验研究。首先，从浆料物理性质的测量结果中了解储热颗粒的密度、导热系数、比热等物理性质。通过毛细管内的流动实验，确定了储热颗粒浆体为低功率流体，得到了浆体的表观粘度。结果表明，相变条件下的换热系数比非相变条件下的提高了一倍以上。利用合适的物性来定义无量纲参数，发现浆料的传热系数可以用常用的经验关联式很好地表达出来。

An experimental investigation was performed to clarify the heat transfer characteristics of thermal storage micro capsule-water slurry, which was dispersed micro-capsulated phase change particles in water, through a capillary. First, the physical properties such as the density, thermal conductivity, specific heat etc. of thermal storage particle were comprehended from the measurement results of the physical properties of the slurry. From the flow experiments in a capillary, it was confirmed that the thermal storage particle slurry were power low fluid and the apparent viscosities of slurry were obtained.Next, the heat transfer experiments were carried out for the slurry in the capillary. As a result, the heat transfer coefficient under the phase change condition was found to increase up to twice of the value under non-phase change condition. By the use of appropriate properties to define the non-dimensional parameters, it was found that the heat transfer coefficients of slurry were expressed well by the empirical correlation commonly used.