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Journal of Enhanced Heat Transfer

Impact factor: 0.400

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer


pages 395-403

Effect of Dissolved Noncondensables on Hydrodynamics of Microchannels Subject to Liquid Forced Convection

T. M. Adams
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405
S. M. Ghiaasiaan
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405
S. I. Abdel-Khalik
G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

ABSTRACT

The impact of the desorption of dissolved noncondensables on the hydrodynamics of heated, long microchannels subject to liquid forced convection is theoretically studied. A one-dimensional model, based on the solution of mass, momentum, energy and a noncondensable species mass conservation equations, is developed. Parametric calculations representing typical microchannel geometric and flow conditions are then performed. It is shown that the desorption of noncondensables can lead to a gas-liquid two-phase flow and therefore enhance the fluid velocity in microchannels rather significantly, with the enhancement becoming larger as the channel length to diameter ratio is increased. Desorption of the noncondensable and its accompanying evaporation, furthermore, may lead to choking.