### 6.8.4. Mass Transfer to and from the Wall Film

Mass transfer due to evaporation is computed from Equation 6–192, Equation 6–196 or Equation 6–197 depending on the regime (viz., flooded or non-flooded) and the state of the particle (viz., boiling or non-boiling). Mass transfer from impinging droplets is computed by simply adding the droplet mass to the film mass on a particular wall face.

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