Analysis of pulsating heat pipe with a dual-diameter tube

dc.contributor.authorKwon, G.H.
dc.contributor.authorKim, S.J.
dc.date.accessioned2015-04-24T07:18:21Z
dc.date.available2015-04-24T07:18:21Z
dc.date.issued2014
dc.description.abstractPaper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.en_ZA
dc.description.abstractA series of experiments was performed to investigate the effect of a dual-diameter channel on the flow and heat transfer characteristics of single-turn pulsating heat pipes (PHPs). Various types of PHPs were made of glass capillary tubes with various inner diameters, and experiments to evaluate thermal performance of the PHPs were performed with varying input power and inclination angle. Quantitative data obtained by highspeed photography that asymmetric PHPs with a dual-diameter channel promote circulating flow over a wider range of experimental conditions compared to symmetric PHPs with a uniform diameter channel. Circulating flow promoted by a dualdiameter channel helps to enhance the thermal performance of the PHP and reduces thermal resistance by up to 45%. A simplified model was developed to predict thermal characteristics of asymmetric PHPs with circulating flow, and the predicted data matched well with experimental data to within the error of 15%. Experimental and calculated data show that there exists an optimum range of diameter deviation where the thermal performance enhancement is maximized. The optimal range of dimensionless diameter deviation is found to be between 0.25 and 0.4, and this study provides design guidelines to improve thermal performance of the PHP.en_ZA
dc.description.librariancf2015en_ZA
dc.format.mediumPDFen_ZA
dc.identifier.citationKwon, GH, Kim, SJ 2014, ' Analysis of pulsating heat pipe with a dual-diameter tube', Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.en_ZA
dc.identifier.isbn97817759206873
dc.identifier.urihttp://hdl.handle.net/2263/44720
dc.publisherInternational Conference on Heat Transfer, Fluid Mechanics and Thermodynamicsen_ZA
dc.rights© 2014 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.en_ZA
dc.subjectDual-diameter tubeen_ZA
dc.subjectPulsating heat pipesen_ZA
dc.subjectCirculating flowen_ZA
dc.subjectThermal performance and resistanceen_ZA
dc.subjectOptimum diameteren_ZA
dc.titleAnalysis of pulsating heat pipe with a dual-diameter tubeen_ZA
dc.typePresentationen_ZA

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