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Laminar film condensation in a vertical tube in the presence of noncondensable gas. (English) Zbl 1130.76431
Summary: We develop a two-dimensional steady-state model of convective film-wise condensation of a vapor and noncondensable gas mixture flowing downward inside a vertical tube. The mass transfer at the film and gas interface is treated as diffusion-controlled process. The noncondensable effect on the condensation is taken into account through boundary layer analysis of species concentration and energy balance. Numerical predictions were obtained for the condensation heat transfer coefficient of turbulent vapor flow associated with laminar condensate. The predictions were compared with experimental data in the literature to assess the model. Noncondensable mass fraction and vapor-noncondensable mixture temperature were presented in the form of radial and axial profiles.

MSC:
76T10 Liquid-gas two-phase flows, bubbly flows
80A22 Stefan problems, phase changes, etc.
80A20 Heat and mass transfer, heat flow (MSC2010)
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