.ThermalSeparation.FilmModel.RandomPackedColumn.EnhancementMS.MassTransferCoeffVap .ThermalSeparation.FilmModel.RandomPackedColumn.EnhancementMS.MassTransferCoeffVapmodel MassTransferCoeffVap = ThermalSeparation.HeatAndMassTransfer.RandomPackedColumn.Vapour.Constant;