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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

An Experimental Analysis of an Open Looped Pulsating Heat Pipe Operating with a Dielectric Working Fluid for Embedded Power Electronic Applications

Get access (open in a dialog) DOI: 10.1615/IHTC15.tmg.009656
pages 8089-8103

Abstract

The increasing trend towards integrated power electronic systems demands advancements in novel, efficient thermal management solutions to cope with the increasing power density. Coupled with this development is the need to integrate a low-cost passive thermal management solution to mitigate hot spots due to the increase heat flux density. High performance cooling solutions – such as pulsating heat pipes – are viewed as crucial enablers for the future development of high density packages. In this research a 44 channel open looped pulsating heat pipe (OL-PHP) is experimentally investigated for the purpose of integrated thermal management applications in power . The OL-PHP uses NovecTM 649 as the working fluid due to its lower pressure operation, low global warming potential and superior dielectric properties compared to traditional two-phase coolants. The OL-PHP is investigated in three orientations: vertical (90°); 45° and horizontal (0°) with fill ratios ranging from 0.30 to 0.70. The results demonstrate a potential thermal resistance value as low as 0.2 K/W for a fill ratio of 0.40 operating in a vertical orientation – 10 times greater than copper with a achievable maximum heat flux of 2.5W/cm2.