.TRANSFORM.HeatExchangers.GenericDistributed_HX_withMass.TraceMassTransfer_shell .TRANSFORM.HeatExchangers.GenericDistributed_HX_withMass.TraceMassTransfer_shellmodel TraceMassTransfer_shell = Fluid.ClosureRelations.MassTransfer.Models.DistributedPipe_TraceMass_1D_MultiTransferSurface.Ideal;