In this investigation, the 2D flow between two horizontally positioned concentric cylinders (gravity perpendicular to axis of cylinders), where inner cylinder is kept at constant temperature Ti higher than outer border To, analyzed. Buoyancy forces initiate movement fluid and generated studied in a fixed geometry for values Prandtl numbers (Pr) 0.01 1, Rayleigh (Ra) 102 5·106. To solve problem,...

Abstract   This study is applied Lattice Boltzmann Method to investigate the natural convection flow utilizing nanofluids in a concentric annulus. A numerical strategy presents for dealing with curved boundaries of second order accuracy for both velocity and temperature fields. The fluid between the cylinders is a water-based nanofluid containing different types of nanoparticles: copper (Cu), a...

In this paper natural convection heat transfer within a two-dimensional, horizontal, concentric cam shape cylinders that is partially filled with a fluid saturated porous medium has been investigated. both cylinder are kept at constant and uniform temperatures with the outer cylinder being subjected relatively lower than the inner one. In addition the forchheimer and brinkman effect are taken i...

following recent works of several authors like huilgol, bhattacharya etd. and javadpour et al., this paper is to contribute further to the literature of axial flow in a rotational coaxial rheometer. we consider axial flow of herschel bulkley mode1 between two concentric cylinders with the inner one rotating, while the outer cylinder is held stationary. an attempt has been made to direct the ana...

Due to their peculiar property of controlled stiffness and strength under an external magnetic field, magnetorheological (MR) fluids show great potential in developing hybrid robotic grippers that the future could offer same versatility as human hand. This demands for sufficiently strong, compact switchable field sources which permanent magnets are often overshadowed by electromagnets. However,...

Continuum theory is employed to investigate the stability of a sample of nematic liquid crystal contained between two long, concentric, circular cylinders, rotating with constant angular velocity about the cylindrical axis, when subjected to a radial thermal gradient. We consider the arrangement in which the anisotropic axis of the material is initially uniformly aligned parallel to the axis of...

In contrast to our previous study (Barth & Marx, 2008) dealing with a currently decreasing research field (high-temperature superconductors) we analyzed here a topic which has raised a strongly increasing interest among researchers: research activities around carbon nanotubes (CNTs or NTs). Carbon nanotubes (often named only nanotubes) are graphite sheets rolled up into cylinders with diameters...