## 1.14. Wall Condensation Theory

The wall condensation model may be used to model condensation of a condensable component of a variable composition mixture, such as steam and air. Condensation may occur on walls or fluid solid boundaries that are sufficiently cold to permit condensation onto a thin liquid film. It assumes that the primary resistance to heat transfer is caused by the boundary gradient of concentration of the condensable component, and that the liquid film is sufficiently thin that its contribution to heat transfer resistance is negligible. Condensation is modeled as a boundary mass sink of the condensable component, effectively removing the condensed mass of the condensable from the fluid domain. Flow in the liquid film is not modeled.

This chapter describes the following:

- Wall Condensation Model
- Condensation Heat Transfer (CHT)
- Specification of Secondary Fluxes

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