A semi-empirical relation based on temperature difference and filling ratio in a closed loop pulsating heat pipe: A numerical study.

Autor: Balamurugan V; Department of Mechanical Engineering, Rajalakshmi Engineering College, Chennai, Tamil Nadu, India., Mian P S; Department of Mechanical Engineering, Rajalakshmi Engineering College, Chennai, Tamil Nadu, India., Hasan MJ; Department of Mechanical and Production Engineering (MPE), Islamic University of Technology (IUT), Board Bazar, Gazipur, Bangladesh., Sudharsan NM; Department of Mechanical Engineering, Rajalakshmi Engineering College, Chennai, Tamil Nadu, India.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 Nov 19; Vol. 19 (11), pp. e0309108. Date of Electronic Publication: 2024 Nov 19 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0309108
Abstrakt: A closed-loop pulsating heat pipe (CLPHP) is an attractive passive cooling system for electronic components. The design of CLPHP is challenging due to the complex nature of thermo-hydrodynamic coupling. This study investigates the heat transfer efficiency of a CLPHP using water as the working fluid. The heat transfer rate is evaluated for a volume fraction of 0.3-0.7 and an evaporator temperature of 323-373 K. From the computed results, a regression analysis is performed to generate a semi-empirical equation. The empirical relation for heat transfer rate (Q) as a function of the temperature difference and filling ratio was found to match the CFD results. Similarly, a semi-empirical equation for heat flux (q) as a function of non-dimensionless numbers is presented to calculate the heat transfer rate (Q) for various filling ratios, and found to match CFD results. A force plot measuring the net force acting on the slugs is presented for various filling ratios and evaporator temperatures. The net force plot will help optimize the design of the CLPHP and improve its efficiency. When comparing slug formation pulsatile cycle and thermal efficiency, 0.5 volume fraction was found to be optimum. For this filling ratio (0.5) heat transfer rate is enhanced from 40% to 86% when the evaporator temperature is increased by 15%.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2024 Balamurugan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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