.ThermalSeparation.FilmModel.StructuredPackedColumn.MS_mod.MassTransferCoeffVap .ThermalSeparation.FilmModel.StructuredPackedColumn.MS_mod.MassTransferCoeffVapmodel MassTransferCoeffVap = ThermalSeparation.HeatAndMassTransfer.StructuredPackedColumn.Vapour.RochaStructured;