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Abstract Fluent software is used to select VOF model and load user-defined function(UDF)to realize the phase change heat transfer process in the gravity heat pipe,and the numerical simulation analysis of gravity heat pipe is carried out.The results show that fluent can better present the phase transformation process in the gravity heat pipe;when the heating power is 60 W,the heat transfer coefficient reaches the maximum value;when the heating power continues to increase to 80 W,the heat transfer coefficient gradually decreases;when the liquid filling rate is in the range of 0.20 ~ 0.24,the equivalent convective heat transfer coefficient also increases with the increase of liquid filling rate;when the liquid filling rate increases to 0.32,the equivalent convection heat transfer coefficient increases.When the liquid filling rate is 0.24,the equivalent convective heat transfer coefficient is the highest.The equivalent convective heat transfer coefficient increases with the increase of the inclination angle in the range of 30° to 60° and decreases when the inclination angle increases to 90° and the equivalent convective heat transfer coefficient reaches the maximum when the inclination angle is 60°.
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Published: 11 March 2024
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