Abstract
A two-phase closed thermosyphon is an efficient heat transfer element. The heat transfer process of this type of thermosyphon includes conduction and convective heat transfer accompanied by phase changes. Variations in the inclination angle of a thermosyphon affect the steady-state heat transfer performance of the device. Therefore, the inclination angle is an important factor affecting the performance of a thermosyphon. In this paper, an equation for the actual heating area variations with respect to the inclination angle is deduced, and a model for the areal thermal resistance of a thermosyphon is proposed by analyzing the main influence mechanisms of the inclination angle on the heat transfer process. The experimental results show that the areal thermal resistance, which accounts for the effect of the actual heating area, does not change with respect to the inclination angle and exhibits a linear relationship with the heat transfer rate. The thermal resistance equation is fit according to the experimental data when the inclination angle of the thermosyphon is vertically oriented (90°), and the predicted values of the thermosyphon’s thermal resistance are obtained when the thermosyphon is inclined. The deviations between the experimental data and predicted values are less than ±0.05. Therefore, the theoretical equation can accurately predict the thermosyphon’s thermal resistance at different inclination angles.
Highlights
A two-phase closed thermosyphon is an important heat transfer element with an extremely high heat transfer coefficient [1]
When the inclination angle is less than 60◦, the thermal resistance of the thermosyphon decreases with increasing inclination angle
(1) The actual heating area of a thermosyphon is defined as the contact area between the working fluid in the liquid pool and the inner wall of the thermosyphon, which is part of the heater
Summary
A two-phase closed thermosyphon is an important heat transfer element with an extremely high heat transfer coefficient [1]. These types of thermosyphons are widely used for aerospace applications [2], electronic device heat dissipation [3], room temperature control [4], cold storage control [5], geothermal energy utilization [6] and other applications. The working fluid in the thermosyphon liquid pool undergoes phase transformation, transforms into a gaseous working fluid, transfers heat to the condensation section, releases latent heat into the liquid working fluid, and completes the cycle via gravity reflux to the evaporation section [5,7,9] The working fluid in the thermosyphon liquid pool undergoes phase transformation in the evaporation section, transforms into a gaseous working fluid, transfers heat to the condensation section, releases latent heat into the liquid working fluid, and completes the cycle via gravity reflux to the evaporation section [5,7,9]
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