1. An experimental investigation on the heat transfer characteristics of closed-loop pulsating heat pipe with graphene–water nanofluid.
- Author
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Tharayil, Trijo, Asirvatham, Lazarus Godson, Manova, Stephen, Vivek, V. M., Senthil Saravanan, M. S., Sajin, J. B., and Wongwises, Somchai
- Subjects
HEAT transfer ,HEAT pipes ,NANOFLUIDS ,THERMAL resistance ,DISTILLED water ,HEATING load ,WATER use - Abstract
The heat transfer performance of a closed-loop pulsating heat pipe (CLPHP) having 2.2 mm inner diameter is experimentally studied at different filling ratios (40%, 50%, 60% and 70%) in a heat load range of 50–300 W using distilled water as the PHP fluid in vertical orientation with evaporator at the bottom. This experimental study validate that the optimum charging ratio is 50% for CLPHP while 40% filling ratio is good at lower heat inputs. Optimum filling ratio gives an average reduction of 26.0% and 14.8% in thermal resistance compared to 70% and 60% fill ratios. The heat transfer performance of the CLPHP is also studied at various volume fractions of graphene–water nanofluid using 50% filling ratio. This study shows that the optimum volume fraction for this CLPHP is 0.045%. The volume fraction of 0.045% gives an average reduction of 27.3% in thermal resistance for all heat inputs and a maximum temperature reduction of 24 °C for the evaporator wall temperature at 275 W heat input. When optimum values of filling ratio and volume fraction are used, CLPHP gives the best heat transfer performance. A correlation is also developed for CLPHP by considering the influential parameters. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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