THERMAL SCIENCE

International Scientific Journal

Niti Kammuang-Lue

,

Phrut Sakulchangsatjatai

,

Kritsada On-Ai

,

Pradit Terdtoon

THERMAL RESISTANCE OF ROTATING CLOSED-LOOP PULSATING HEAT PIPES: EFFECTS OF WORKING FLUIDS AND INTERNAL DIAMETERS

ABSTRACT
The objective of this study was to experimentally investigate the effects of working fluids and internal diameters on the thermal resistance of rotating closed-loop pul¬sating heat pipes (RCLPHP). The RCLPHP were made of a copper tube with internal diameters of 1.50 mm and 1.78 mm, bent into the shape of a flower petal, and arranged into a circle with 11 turns. The evaporator section was located at the outer end of the tube bundle. R123, ethanol, and water were filled as the working fluids. The RCLPHP was rotated at centrifugal accelerations 0.5, 1, 3, 5, 10, and 20 times of the gravitational acceleration considered at the connection between the evaporator and the condenser sections. The heat input was varied from 30 W to 50 W, and then to 100 W, 150 W, and 200 W. It can be concluded that when the latent heat of evaporation increases, the pressure difference between the evaporator and the condenser sections decreases, and the thermal resistance increases. Moreover, when the internal diameter increases, the driving force increases and the frictional force proportionally decreases, or the Karman number increases, and the thermal resistance decreases.
KEYWORDS
rotating closed-loop pulsating heat pipe, centrifugal acceleration, working fluid, internal diameter, thermal resistance
PAPER SUBMITTED: 2016-08-27
PAPER REVISED: 2017-01-22
PAPER ACCEPTED: 2017-01-22
PUBLISHED ONLINE: 2017-02-12
DOI REFERENCE: https://doi.org/10.2298/TSCI160827009K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Issue 6, PAGES [2993 - 3000]
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Thermal resistance of rotating closed-loop pulsating heat pipes: Effects of working fluids and internal diameters

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence