Experimental study of unsteady convective boiling in heated minichannels |
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Authors: | D Brutin F Topin L Tadrist |
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Affiliation: | Laboratoire IUSTI, UMR 6595 CNRS/Université de Provence, Ecole Polytechnique Universitaire de Marseille, Technopôle de Château-Gombert-5, rue Enrico Fermi, 13453 Marseille, France |
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Abstract: | Convective boiling in narrow channels may under specific conditions display an unsteady behavior. An experimental set-up has been elaborated to investigate heat and mass transfer and to analyze two-phase flow instabilities in rectangular microchannels with a hydraulic diameter of 889 μm. Depending on the operating conditions two types of behavior are observed: a steady state characterized by pressure drop fluctuations with low amplitudes (from 0.5 to 5 kPa/m) and no characteristic frequency; a non-stationary state of two-phase flow. The pressure signals exhibit fluctuations with high amplitudes (from 20 to 100 kPa/m) and frequencies ranging from 3.6 to 6.6 Hz. Steady and unsteady thermo-hydraulic behaviors depending on the two control parameters (heat flux and mass velocity) are analyzed and given in this paper. |
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Keywords: | Convective boiling Minichannels Instabilities |
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