Abstract
The effects of inclination angle on the transient operation of a gravity-assisted copper-water heat pipe are investigated experimentally. The inclination angle and (he input power are varied from 0 (horizontal) to 90 deg (vertical), and from 520 to 820 W, respectively. The transient vapor and wall temperatures are measured at 11 axial locations along the length of the heat pipe. The heatup and cooldown time constants, although specific to this heat pipe design and experimental setup, are used to assess the effect of the inclination angle at different power input and cooling rates. The experimental data of the transient vapor and wall temperatures and the effective power throughput are also used to benchmark a two-dimensional, heat pipe transient analysis model. The model predictions are in good agreement with experiments.
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