The axisymmetric motion of a compressible fluid in a rapidly rotating cylinder is considered using a linear approach and boundary-layer techniques. The deviation of the fluid motion from rigid-body rotation is caused either by an applied... more
The axisymmetric motion of a compressible fluid in a rapidly rotating cylinder is considered using a linear approach and boundary-layer techniques. The deviation of the fluid motion from rigid-body rotation is caused either by an applied temperature distribution on the side wall, a differential rotation of the top and bottom end plates or sources and sinks of fluid distributed on the end plates. The horizontal end plates are assumed to be thermally insulated, while the side wall is conducting. The critical parameter governing the problem is found to be E−½(γ − 1) PrG0/4γ, where E is the Ekman number, γ the ratio of specific heats, Pr the Prandtl number and G0 the square of a rotational Mach number. If this parameter is larger than unity, the coupled effect of the compressibility of the fluid and the thermal condition on the end plates suppresses the flow in the cylinder. The flow in the inner inviscid core is strongly coupled with the Ekman-layer flow through the boundary conditions...
Gas Centrifuge is an equipment used for separation of isotopes like UF6, SF6 or separation of CO 2-CH 4 mixture from natural gas reservoirs consist of annular region scoops for enriched and depleted isotopes. Baffle is creating vertical... more
Gas Centrifuge is an equipment used for separation of isotopes like UF6, SF6 or separation of CO 2-CH 4 mixture from natural gas reservoirs consist of annular region scoops for enriched and depleted isotopes. Baffle is creating vertical structure in the vessel. The simulations are carried out to capture the shock wave near the scoop region which is used for collection of enriched uranium. This region has very high Mach number. This work is providing insight of how to simulate high speed flow with the help of rhoCentralFoam in OpenFoam. SnappyHexMesh utility from OpenFOAM is used for meshing this kind of geometry where parts of geometries intersecting as well as Swak4Foam utility is used to give profile for the internal field and to boundary condition.
