Experimental Study on Heat Release Properties of N-octadecane Phase Change Materials During Solidification in Square Cavity
CAO Shihao1,2,*, ZHAO Xijia1,2, WANG Fangquan1,2, YU Xianlei1,2, YANG Rongshan3
1 College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China 2 Henan Key Laboratory of Grain and Oil Storage Facility and Safety, HAUT, Zhengzhou 450001, China 3 MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract: In this work, the solidification heat release characteristics of n-octadecane phase change materials in square cavity was studied. Firstly, in order to improve the thermophysical parameters, the relation curves of liquid density, dynamic viscosity and temperature were measured. Then a comprehensive test of the solidification heat release of n-octadecane was designed, the temporal and spatial distribution characteristics of temperature were measured, as well as the evolution of solidification boundary. The results show that, the liquid density decreases linearly with temperature, the dynamic viscosity has a quadratic polynomial decreasing relationship with temperature, and the thermal expansion coefficient ranges from 9.03×10-4℃-1 to 9.55×10-4℃-1. In low temperature environment, the solidification boundary of n-octadecane in the square cavity spreads symmetrically towards the center point. The whole solidification heat release process can be divided into four stages, the energy storage release in the first two stages accounts for 97.1%, while the liquid phase natural convection heat transfer only has a weak influence on the first stage. In addition, there is a quartic polynomial relationship between the freezing efficiency and the cooling temperature, in which 15 ℃ is the optimal cooling temperature.
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2025, Vol. 39 
