Characterization of a Closed Loop Pulsating Heat Pipe Using Ethanol with Different Angles
2021
n low-temperature difference, a closed-loop pulsating heat pipe (CLPHP) can be used as
a cooling device due to its capability to transfer heat. The thermal performance of the
CLPHP is affected by the working fluids. In this work, the effects of some operating
parameters such as using ethanol as working fluid with 0.5 filling ratio, orientation, and
power inputs are offered based on experimental study. Where the CLPHP was constructed
and tested to achieve a better vision into the effect of orientation of 0°, 15°, 30°, 45°, and
90°, and power input of 50 W, 115 W, 215 W, and 450 W on the heat transfer
characteristics and the thermal performance. The results indicated that the minimum
thermal resistance can be reached at 0.1585 (℃/W) with an orientation of 90° and a power
input of 450 W. The results revealed that the inclination angles and power inputs had
considerable influence on the enhancement of the thermal performance of the CLPHP. For
the low boiling temperature of the working fluid, the power input is more favorable because
of fast startup compared with a high power input that leads to some difficulties like the
dry-out phenomenon.
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