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