Numerical analysis of vapor flow in the condenser region of a VHCP or thermosyphon.

Le résumé fourni par la source

A numerical analysis of two-dimensional vapor flow was conducted in the condenser region of a thermosyphon in the prerence of a noncondensable gas in that region. The governing equations are composed of three conservative equations of a vapor gas mixture including binary diffusion and that of species concentration. In the diffusion equation, two conditions of constant mass concentration and constant molar concentration are examined, and their results are discussed. The effect of a liquid film on the heat transfer rate of vapor condensation on the condenser wall is considered, with the assumption that a Clausius-Clapeyron relation holds at the film-vapor interface. A finite difference scheme is employed in the calculation, and the results are compared with those of the experiment. Agreement between the two is fairly good, which implies the validity of the numerical model in analyzing the mechanism of such a flow field.

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