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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

REFLUX CONDENSATION INSIDE A TWO-PHASE THE RMOSYPHON AT PRESSURES UP TO THE CRITICAL

Get access (open in a dialog) DOI: 10.1615/IHTC8.30
pages 1613-1620

Resumo

The heat transport from the heating zone to the cooling zone of a two-phase thermosyphon ('wickless heat pipe') is basically determined by the processes of evaporation and condensation. In order to learn about the characteristic parameters, an experimental investigation was performed for reflux film condensation inside a closed tube with refrigerant R13B1 as working fluid. A wide range of pressures (up to the critical), heat flow rates and inclination angles of the thermosyphon were applied. The results indicate that film flow patterns can be achieved in both the laminar (-wavy) and turbulent region. The multiple effects of heat flow rate, inclination and pressure on condensation heat transfer as found in our experiments, are discussed, and important influences are analysed. The results are compared with known relations for laminar and turbulent film condensation heat transfer, and a new equation is presented which includes particular factors for the effects of inclination and pressure.