1.

     In an open material system where the residence time distribution of a fluid is known, it is possible, using micromixing Zwietering's model to predict the result of linear interaction between the fluid and the wall of system but also for the aerosol particles transported by the fluid flow. This methodology is applied for aerosol deposition by thermophoresis in cylindrical pipe with constant wall temperature. The interpretation of experimental results in laminar flow shows that for Knudsen numbers, comprised between 0.2 to 1, the thermophoresis coefficient must be calculated by Talbot's correlation. Finally, in transition flow, the aerosol mass deposition by thermophoresis and turbulent diffusion becomes probably minimal.

2.

     This paper deals with the laminar flow of an incompressible ferromagnetic fluid in a slot between two surfaces of revolution, having parallel axes; one of these surfaces rotates with constant angular velocity and the other is fixed. This model of flow corresponds to the throughflow of lubricating fluid in the thrust bearing of curvilinear form.
     The linearized equations of motion of the fluid flow in the intrinsic curvilinear orthogonal coordinate system x, *, y are used. The obtained solutions have been illustrated by examples of throughflow in conical and spherical bearings.

3.

     In this paper the authors present a solution to the problem of a multilobe conical bearing lubricated with an incompressible Newtonian fluid. The problem was solved by Galerkin's method after assuming that the inertia effect of the lubricant flow is negligibly small. The general form of solutions for particular cases of the bearing geometry is given.

4.