Heating and evaporation of a multi-component liquid film: Effects of heat flux at the wall and continuous supply of liquid

A new model for heating and evaporation of a multi-component liquid film that takes into account the contribution of the heat flux from/to the wall (the Neumann boundary condition) and supply/removal of liquid to/from the film is described. The Robin boundary condition at the outer surface of the film is used. The film is assumed to be sufficiently thin to allow for the description of the heat transfer and component diffusion processes using one-dimensional heat transfer and component diffusion equations. These equations are used at each time step of the calculation. The solutions to these equations at the end of the time step are used as initial conditions for the next time step with updated values of the input parameters. The predictions of the numerical code are validated using in-house experimental data that refers to water spray impact on a vertical wall. The verification of the model is performed by comparing the predictions of two in-house numerical codes, one based on the new model and the other on the numerical solutions of the heat transfer and component diffusion equations, for a water–ethanol mixture with initial equal mass fractions of the components.