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Natural convection in an annular space provided with metal foam fins attached to the inner cylinder is studied numerically. The made of copper were inserted different axial sections three each section. temperature kept constant while outer surface adiabatic. thickness effect pipe wall was considered. Naiver Stokes equation Boussinesq approximation used for fluid regime Brinkman-Forchheimer Darc...

We present the results of an experimental study on the transition to spiral vortices in flow between concentric counter-rotating cylinders in the presence of an axial through-flow, i.e., in spiral Poiseuille flow. The experiments were performed in an apparatus having an aspect ratio Gamma=L/d=22.8 ( L axial length, d gap width between cylinders) and end plates enabling an in and outflow of mass...

In this paper, we study the effects of the Lorentz force and the induced anisotropic thermal conductivity due to a magnetic field on the flow and the heat transfer of a ferro-nanofluid. The ferro-nanofluid is modeled as a single-phase fluid, where the viscosity depends on the concentration of nanoparticles; the thermal conductivity shows anisotropy due to the presence of the nanoparticles and t...

A new Taylor-Couette system has been designed and constructed with precise temperature control. Two concentric independently rotating cylinders are able to rotate at maximum rates of f(i) = ± 20 Hz for the inner cylinder and f(o) = ± 10 Hz for the outer cylinder. The inner cylinder has an outside radius of r(i) = 75 mm, and the outer cylinder has an inside radius of r(o) = 105 mm, resulting in ...

This paper presents an analytical model for calculating the deformation behavior of an elastic, composite strut comprising any number of materials, which are represented by an assembly of concentric hollow cylinder. The model is applicable for pure axial compression for short struts provided elastic instability, if any, is assessed to be of negligible effect. For a typical constituent cylinder,...