Experimental study of unsteady convective boiling in heated minichannels

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 o...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2003-07, Vol.46 (16), p.2957-2965
Main Authors: Brutin, D, Topin, F, Tadrist, L
Format: Article
Language:English
Subjects:
Applied sciences
Convective boiling
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Heat exchangers (included heat transformers, condensers, cooling towers)
Instabilities
Minichannels
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Summary: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.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(03)00093-0