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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.2016013605
pages 91-109

PULSATING HEAT PIPE IN HYPERGRAVITY CONDITIONS

Mauro Mameli
Department of Energy, Systems, Land and Construction Engineering, University of 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
Department of Energy, Systems, Land and Construction Engineering, University of Pisa, Italy
Marco Marengo
Advanced Engineering Centre, School of Computing Engineering and Mathematics, Cockcroft Building, Lewes Road, University of Brighton, Brighton BN2 4GJ, UK; Department of Engineering, University of Bergamo, Viale Marconi 5, 24044 Dalmine (BG), Italy

ABSTRACT

A closed-loop pulsating heat pipe made of a copper tube (1.1 mm/2 mm I.D./O.D.) and filled with FC-72 has been tested in a large-diameter centrifuge (LDC) of the European Space Agency in Noordwijk at different hypergravity levels up to 20 g, different heat input levels, and different orientations with respect to the gravity direction (vertical bottom heated and horizontal position). The results show 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 pulsating heat pipe (PHP) thermal performance is slightly enhanced by the lower hypergravity levels (up to 3 g at 50 W, up to 4 g at 70 W, and up to 6g at 100 W), while two different local thermal crises affect the PHP thermal behavior at higher acceleration levels.


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