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Heat Pipe Science and Technology, An International Journal

ISSN Imprimir: 2151-7975
ISSN On-line: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.v5.i1-4.420
pages 377-384

VISUALISATION OF FLOW PATTERNS IN FLAT PLATE PULSATING HEAT PIPE: INFLUENCE OF HYDRAULIC BEHAVIOUR ON THERMAL PERFORMANCES

Vincent Ayel
Département Fluide, Thermique et Combustion, Institut Prime, CNRS-ENSMA-Université de Poitiers, UPR 33461, 86961 Futuroscope Chasseneuil Cedex, France
Cyril Romestant
CNRS - Institut Prime-Université de Poitiers - ENSMA UPR 3346, Département Fluides, Thermique, Combustion, 1, avenue Clément Ader BP 40109, 86961 FUTUROSCOPE CHASSENEUIL Cedex France; Universita di Bergamo, Dipartimento di Ingegneria Industriale, Viale Marconi 5, 24044 Dalmine, Bergamo, Italy
Yves Bertin
CNRS - Institut Prime-Université de Poitiers - ENSMA UPR 3346, Département Fluides, Thermique, Combustion, 1, avenue Clément Ader BP 40109, 86961 FUTUROSCOPE CHASSENEUIL Cedex France
V. Manno
Universita di Pisa, DESTEC, Largo L. Lazzarino 2, Pisa, Italy
Sauro Filippeschi
Department of Energy, Systems, Land and Construction Engineering, University of Pisa, Italy

RESUMO

In this experimental study, a specific flat plate pulsating heat pipe (FPPHP) with ethanol as working fluid has been tested. The experimental test bench consists of a copper block at the surface of which a single 10 turns groove has been machined. A transparent glass pressed in front of the top surface and two high speed cameras allow the fluid flow patterns to be visualized during the operations. Thus, the analysis of the synchronized recorded images permits to link the hydraulic behavior of the fluid inside the PHP to its thermal response as regards operating conditions (heat power applied, cooling temperature, inclination). Quantitative and qualitative analysis of the results show that in vertical position the flow pattern are almost always annular whatever the heat power applied, with liquid storage in some adjacent channels; in horizontal position, the evaporator is progressively dried out with some oscillations for specific heat powers. Lastly, by putting the PHP in an original orientation with the gravity, named edge orientation, the fluid motion is transmitted from one-branch-to-another sequence, induced by the pressure difference increased by the gravity forces between channels.


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