.ThermalSeparation.FilmModel.StructuredPackedColumn.EffectiveDiff.InterfacialArea .ThermalSeparation.FilmModel.StructuredPackedColumn.EffectiveDiff.InterfacialAreamodel InterfacialArea = ThermalSeparation.HeatAndMassTransfer.InterfacialArea.StructuredPackedColumn.RochaStructured;