The performance of an externally pressurized gas journal bearing lubricated with R134a vapor used in oil-free refrigeration centrifugal compressor is calculated by solving Reynold equations the finite difference method (CFD). load capacity, stiffness and mass flow rate refrigerant under conditions various operational parameters are obtained compared that air bearings. In addition, influences av...

We derive the incompressible Euler equations with heat convection no-penetration boundary condition from Boltzmann equation diffuse in hydrodynamic limit for scale of large Reynold number. Inspired by recent framework [30], we consider Navier-Stokes-Fourier system no-slip conditions as an intermediary approximation and develop a Hilbert-type expansion around global Maxwellian that allows nontri...

The study of flow liquids in a circular pipe has been studied for long time. theoretical and numerical analysis viscous fluid is very important the field physics, engineering even medicine. In any flow, Napier-Stokes equation are to nature flow. On basis Reynold number, either classified as laminar or turbulent. When heat supplied with liquid having velocity, rate volume, temperature gradient, ...

Among the many experiments Which deals with study of characteristics flow, a numerical flow air (Pr=0.71) crosses circular cylinder is conducted. Variations in and thermal such as average Nusselt number, local pressure coefficient drag are presented around cylinders for Reynold numbers ranging from 100 to 5000 by solving incompressible two-dimensional unsteady Navier-Stokes energy equations. Co...