Heat Transfer Performance of Medium-and High-temperature Molten Salt Gravity Heat Pipes
Using AlBr3 and TiCl4 as heat trans-fer working fluids,the effects of working fluid,filling a-mount,heating power and heat pipe inclination angle on the heat transfer performance of molten salt gravity heat pipes are studied through experimental methods.The heat transfer performance of heat pipes is evaluated by equivalent heat transfer coefficient.As the inclina-tion angle increases,the equivalent heat transfer coeffi-cients of AlBr3 and TiCl4 heat pipes show a trend of first increasing and then decreasing.As the filling a-mount increases,the maximum equivalent heat transfer coefficient of AlBr3 heat pipe decreases,while the max-imum equivalent heat transfer coefficient of TiCl4 heat pipe first increases and then decreases.The heating power affects the heat transfer performance of the heat pipe.Under the optimal inclination angle and filling a-mount of the heat pipe,the equivalent heat transfer co-efficient increases with the increase of heating power.When the filling amount is 100 g,the inclination angle of the heat pipe is 60°,and the heating power is 2 450 W,the equivalent heat transfer coefficient of AlBr3 heat pipe is the highest,reaching 16 500 W/(m2·K).When the filling amount is 40 mL,the inclination angle of the heat pipe is 60°,and the heating power is 600 W,the equivalent heat transfer coefficient of TiCl4 heat pipe is the highest,reaching 12 500 W/(m2·K).The heat transfer performance of AlBr3 heat pipe is better than that of TiCl4 heat pipe,and AlBr3 heat pipe is more in line with the technical requirements of medium temperature heat pipe.
molten saltgravity heat pipee-quivalent heat transfer coefficientheat transfer per-formance
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