ISSN Online: 2377-424X
ISBN Print: 978-1-56700-421-2
International Heat Transfer Conference 15
An Experimental Analysis of an Open Looped Pulsating Heat Pipe Operating with a Dielectric Working Fluid for Embedded Power Electronic Applications
摘要
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.