Solid bodies approaching each other in a viscous fluid -- Velocity and displacement of spherical particles subjected only to drag -- Flow through parallel channels separated by a permeable wall -- Laminar oscillatory flow in a plane channel -- Nusselt number in channel flow with general thermal boundary conditions -- Buoyant flow in a duct or a loop -- Stability of two-phase flow in a heated duct -- Heat transfer in spray cooling as an inverse problem -- Apparent Sherwood number in mass transfer with wall transpiration -- One-dimensional mixed MHD convection.