Archive issue - vol.1 No.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
aerosol, thermophoresis, Zwietering's model, laminar fluid flow, Knudsen number, Talbot's correlation.
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.
curviliner thrust bearing, ferrofluid flow, local and global parameters.
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.
conical bearing, Newtonian lubricant, Galerkin's method, mechanical parameters.
This work will present and apply formulas for calculating repulsive forces and
stiffness of radial bearings, constituted by ring-shaped permanent magnets.
Magnetic fields will be defined using equivalent surface currents densities theory,
while forces will be calculated using Ampère*s theory, assuming uniform
magnetization throughout the volume of the magnets. The formulas can be used, with
a few modifications, for all kinds of ring-shaped magnetic bearings. In the case
of a radial bearing, values of calculated forces are compared to data presented by
other authors, and calculated using different methods.
magnetic bearing, ring magnet, radial stiffness, Ampère*s theory.