Abstract
Heat pipe may be affected by the high temperature heat source during operation, resulting in unsteady oscillation heating. In this paper, the influence of alternating power and period on the start-up and heat transfer performance of mercury heat pipe is studied by using the method of equivalent thermal resistance of heat pipe. The results are as follows:1) The start-up time of alternating power heating and steady-state power heating is basically equal; 2) For the alternating power heating, the steady-state temperature of heat pipe changes periodically, increasing the alternating period or the amplitude of alternating power will lead to the increase of the fluctuation amplitude of heat pipe temperature, and the influence of alternating period is greater than that of changing the amplitude of alternating power. 3) Under the condition of alternating power heating, the steady-state thermal resistance of heat pipe changes periodically. The fluctuation amplitude of steady-state thermal resistance of heat pipe increases with the increase of alternating period and alternating power amplitude, and the influence of alternating power amplitude is greater than that of alternating period.
Highlights
Heat pipe has been widely used in electronic industry [1], energy industry [2] and aerospace[3,4], because of its good isothermal property, high reliability and no need to provide additional power
Enke et al Studied the transient response behavior of the axiallygrooved aluminum-ammonia heat pipe with the presence of non-condensable gas, and found that the presence of non-condensable gas will lead to the gradual deterioration of the heat pipe performance[5].Wang et al explored the influence of inclination angle and input power on the startup performance of high temperature potassium heat pipe, and discovered that the start-up performance is mainly affected by capillary heat transfer limit and viscous heat transfer limit under the condition of uniform and constant heat flow[6]
The start-up and heat transfer performance of a mercury heat pipe under periodic heat source was studied by using the equivalent thermal resistance method, which provides some theoretical guidance for understanding the operation of mercury heat pipe under unstable heat source
Summary
Heat pipe has been widely used in electronic industry [1], energy industry [2] and aerospace[3,4], because of its good isothermal property, high reliability and no need to provide additional power. Miao et al experimentally analyzed the heat transfer performance for a Bent CopperWater Heat Pipe. Xu et al pointed out that the solar radiation intensity has a great influence on the operation of high temperature heat pipe receiver[9]. Shen et al experimentally studied the heat transfer performance of triangle high temperature heat pipe with variable heat flux. The results showed that the alternating power has an important influence on the heat transfer of heat pipe[10]. The start-up and heat transfer performance of a mercury heat pipe under periodic heat source was studied by using the equivalent thermal resistance method, which provides some theoretical guidance for understanding the operation of mercury heat pipe under unstable heat source
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