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The Flux (Danckwerts) condition (default) prescribes the flux defined from the upstream vapor concentration (or mass fraction) and the fluid velocity at the boundary. Using this condition, the moisture condition is not strictly enforced at the inlet. Instead a flux is set on this boundary. The higher the flow rate, the smallest difference between the inlet and upstream vapor concentration (or mass fraction).
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The Discontinuous Galerkin constraints option enforces the upstream vapor concentration (for Diluted species option) or the upstream vapor mass fraction (for Concentrated species option) on the boundary.
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Evaporative Cooling of Water: Application Library path Heat_Transfer_Module/Phase_Change/evaporative_cooling
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