THERMOPHYSICAL PROPERTIES OF MICROCAPSULATED PHASE CHANGE MATERIALS SLURRY
The phase change material (PCM) microcapsule is a kind of encapsulated fine PCM, which the core materials are encapsulated with membrane of synthetic material. In the present study, the core materials in the PCM microcapsule are composed of several kinds of n-paraffin waxes (mainly nonadecane) and the membrane is a type of melamine resin. The melting point of the microencapsulated PCM slurry is about 31 ℃ in this study. The range of diameter of the paraffin particles is distributed from 0 μm to 4.5 μm, and its average diameter is 0.74 μm. The thickness δ of melamine resin is about 11nm. Thermophysical properties of the PCM slurry are measured, such as density, apparent specific heat and apparent viscosity. The apparent specific heat is measured using a DSC. The two local maximum value of apparent specific heat is discovered in the temperature range from 2℃ to 50 ℃. They are the phase transition process during the first peak stage and the phase change process for the second peak stage, respectively. A rotary cylinder viscosity meter is used for measuring the viscosity of the slurry. It is found that the measured shear stress does not show a linear relationship with the strain rate, and it indicates that it has a non-Newtonian fluid behavior. In the study, the mass concentration of microcapsule PCM slurry is 40 ％, 30 ％, 20 ％, and 10 ％, respectively.
Yanlai ZHANG Hideo INABA
College of mechanical &electrical Engineering Central South University of Forestry and Technology Ch Tsuyama National College of Technology Tsuyama-City, Okayama, Japan, 708-8509
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
1154-1158
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）