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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Experimental Investigation on a Closed Loop Pulsating Heat Pipe in Hyper-Gravity Conditions

DOI: 10.1615/IHTC15.tpa.009100
pages 8255-8267

Mauro Mameli
University of Pisa Department of Energy, Systems, Territory and Constructions Engineering (DESTEC) Largo L. Lazzarino 2, 56121, Pisa, Italy

Miriam Manzoni
Universita di Bergamo, Viale Marconi 5, 24044 Dalmine (BG), Italy

Lucio Araneo
Politecnico di Milano, Dipartimento di Energia, Via Lambruschini 4A, 20158 Milano, Italy

Sauro Filippeschi
University of Pisa, DESTEC, Largo Lazzarino 2, 56122 Pisa, Italy

Marco Marengo
School of Computing, Engineering and Mathematics Cockcroft Bldg, C221, Lewes Rd University of Brighton, Brighton BN2 4GJ, UK; Department of Engineering, University of Bergamo, Viale Marconi 5, 24044 Dalmine (BG), Italy


KEY WORDS: Two-phase/Multiphase flow, Heat pipe, hypergravity, Large Diameter Centrifuge

Abstract

A Closed Loop Pulsating Heat Pipe made of a copper tube (1.1mm/2mm I.D./O.D.) and filled with FC-72 has been tested on the Large Diameter Centrifuge (LDC) of the European Space Agency in Noordwijk at different hypergravity levels up to 20g, different heat input levels and different orientations with respect to the gravity direction (vertical bottom heated and horizontal position). Results shows that both in the horizontal and vertical orientation the device operation depends on the combined effect of gravity and heat input level. For the horizontal orientation, fluid stratification and the consequent thermal crisis occur at different acceleration levels depending also on the heat input power level and on the heating/gravity history. During the vertical operation the PHP thermal performance is slightly enhanced by the lower hyper-gravity levels (up to 3g at 50W, up to 4g at 70W and up to 6g at 100W) while two different local thermal crisis affect the PHP thermal behavior with the higher acceleration levels.

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