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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.2017018910
pages 13-25

EFFECT OF CONDENSER TEMPERATURE ON THE START-UP OF A PULSATING HEAT PIPE

L. A. Betancur
Mechanical Engineer Department, Federal University of Santa Catarina (UFSC), Brazil
Daniele Mangini
University of Bergamo, Italy; Advanced Engineering Centre, School of Computing Engineering and Mathematics, Cockcroft Building, Lewes Road, University of Brighton, Brighton BN2 4GJ, UK
Mauro Mameli
University of Pisa Department of Energy, Systems, Territory and Constructions Engineering (DESTEC) Largo L. Lazzarino 2, 56121, Pisa, Italy
Sauro Filippeschi
University of Pisa, DESTEC, Largo Lazzarino 2, 56122 Pisa, Italy
L. K. Slongo
Mechanical Engineer Department, Federal University of Santa Catarina (UFSC), Brazil
K. V. Paiva
Mechanical Engineer Department, Federal University of Santa Catarina (UFSC), Brazil
Marcia Barbosa Henriques Mantelli
Heat Pipe Laboratory (LABTUCAL), Federal University of Santa Catarina, Mechanical Engineering Department, 88040-900, Trindade, Florianopolis, SC, Brazil
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

RESUMO

A pulsating heat pipe, filled with distilled water, has been designed and tested at different condenser wall temperatures and heat power inputs in vertical position. The device consists of a copper tube (internal and external diameters 3.18 and 4.76 mm), bended into a planar serpentine with five U-turns in the heated zone. The tube is closed in a loop, evacuated and partially filled with pure water, with a filling ratio of 50%. The heating section is equipped with two heating elements capable of dissipating up to 350 W. A cold plate, directly connected to a thermal bath, keeps the condenser at a constant temperature in the range from 10°C to 60°C, permitting tests to be performed at different condenser temperature levels. The experimental results show different temperature superheats at different heat fluxes when the condenser temperature and the input power are modified. Based on experimental data, a theoretical analysis of the heat transfer mechanisms for the dynamic behavior of the PHP is carried out. The minimum superheating temperature needed to induce boiling has been compared with experimental results. The result of this simplified model, which is based on the Rohsenow equation, is compared with experimental data, showing good agreement after the full activation of the tested device.


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