Effect of bend radius and insulation on adiabatic section on the performance of a single closed loop pulsating heat pipe: experimental study and heat transfer correlation

Parthasarathi, S and Nagarajan, S and Desai, S and Reddy, SU and Narasimham, GSVL (2021) Effect of bend radius and insulation on adiabatic section on the performance of a single closed loop pulsating heat pipe: experimental study and heat transfer correlation. In: Heat and Mass Transfer/Waerme- und Stoffuebertragung .

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Abstract

Pulsating heat pipes are a relatively newer generation of heat pipe which are wickless thus more economical and less fabrication-intensive. These devices are made of a capillary sized tube bent in a serpentine form to result in a closed system. In this study a single closed loop pulsating heat pipe made of 2 mm internal diameter copper tubing is experimentally investigated for two different bend radii. The performance comparison is made for two fluids � methanol and water, for varying heat loads from 10 W to 100 W, with various inclinations from vertical bottom heated mode to horizontal mode, for a constant fill ratio of 60. The sharper bend, though making the device more compact, is found to reduce the performance. One of the bend geometries is further investigated for the effect of insulation on the adiabatic sections. The insulation is found to certainly widen the heat load range though a distinct performance improvement is not found. The variation of the frequency of pressure pulsations with respect to the fluid, heat load and inclination is also studied. Additionally, one of the geometry is tested with FC 72 fluid as well to arrive at a correlation for heat flux for varying fluids, heat fluxes and inclinations, covering 116 data points. The performance trends predicted by the correlation are in line with those reported in the literature. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

Item Type:	Journal Article
Publication:	Heat and Mass Transfer/Waerme- und Stoffuebertragung
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to Springer Science and Business Media Deutschland GmbH
Keywords:	Heat flux; Heat pipes; Insulation; Serpentine; Thermal load, Closed loop pulsating heat pipes; Closed systems; Copper tubing; Heat transfer correlation; Internal diameters; Performance comparison; Pressure pulsation; Pulsating heat pipe, Heat transfer performance
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	27 Jul 2021 11:01
Last Modified:	27 Jul 2021 11:01
URI:	http://eprints.iisc.ac.in/id/eprint/68949

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