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A comparative study of flow regimes and thermal performance between flat plate pulsating heat pipe and capillary tube pulsating heat pipe

Takawale, Anand and Abraham, Satyanand and Sielaff, Axel and Mahapatra, Pallab Sinha and Pattamatta, Arvind and Stephan, Peter (2019):
A comparative study of flow regimes and thermal performance between flat plate pulsating heat pipe and capillary tube pulsating heat pipe.
In: Applied Thermal Engineering, pp. 613 - 624, 149, ISSN 1359-4311,
DOI: 10.1016/j.applthermaleng.2018.11.119,
[Online-Edition: https://doi.org/10.1016/j.applthermaleng.2018.11.119],
[Article]

Abstract

This paper reports the results of an experimental study to investigate the performance comparison between two Pulsating Heat Pipes namely, a Flat Plate Pulsating Heat Pipe (FPPHP) and a Capillary Tube Pulsating Heat Pipe (CTPHP). The comparison is made based on the flow regimes and the corresponding thermal performances at heat inputs varying from 20 W to 180 W with filling ratios of 40, 60, and 80. Experiments are performed in the vertical bottom heating mode with ethanol as the working fluid. The pressure inside the PHPs and temperatures at the evaporator and condenser region are measured along with a recording of the internal flow regimes using a high-speed camera. Slug-plug flow is observed to be the dominant flow regime in both the PHPs. However, the amplitude of oscillations is found to be higher in CTPHP as compared to FPPHP. The reduction in thermal resistance of FPPHP and CTPHP due to the presence of working fluid is about 83 and 35 of the corresponding thermal resistances without any working fluid respectively. CTPHP shows better thermal performance than FPPHP due to the presence of lateral conduction arising in the latter which has a detrimental effect on the slug-plug oscillations.

Item Type: Article
Erschienen: 2019
Creators: Takawale, Anand and Abraham, Satyanand and Sielaff, Axel and Mahapatra, Pallab Sinha and Pattamatta, Arvind and Stephan, Peter
Title: A comparative study of flow regimes and thermal performance between flat plate pulsating heat pipe and capillary tube pulsating heat pipe
Language: English
Abstract:

This paper reports the results of an experimental study to investigate the performance comparison between two Pulsating Heat Pipes namely, a Flat Plate Pulsating Heat Pipe (FPPHP) and a Capillary Tube Pulsating Heat Pipe (CTPHP). The comparison is made based on the flow regimes and the corresponding thermal performances at heat inputs varying from 20 W to 180 W with filling ratios of 40, 60, and 80. Experiments are performed in the vertical bottom heating mode with ethanol as the working fluid. The pressure inside the PHPs and temperatures at the evaporator and condenser region are measured along with a recording of the internal flow regimes using a high-speed camera. Slug-plug flow is observed to be the dominant flow regime in both the PHPs. However, the amplitude of oscillations is found to be higher in CTPHP as compared to FPPHP. The reduction in thermal resistance of FPPHP and CTPHP due to the presence of working fluid is about 83 and 35 of the corresponding thermal resistances without any working fluid respectively. CTPHP shows better thermal performance than FPPHP due to the presence of lateral conduction arising in the latter which has a detrimental effect on the slug-plug oscillations.

Journal or Publication Title: Applied Thermal Engineering
Volume: 149
Uncontrolled Keywords: Thermal performance, Pulsating heat pipe, Flat plate pulsating heat pipe, Capillary tube pulsating heat pipe
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Profile Areas
Profile Areas > Thermo-Fluids & Interfaces
Date Deposited: 19 Dec 2018 10:22
DOI: 10.1016/j.applthermaleng.2018.11.119
Official URL: https://doi.org/10.1016/j.applthermaleng.2018.11.119
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