Laminar forced convection heat transfer from a cylinder covered with an orthotropic porous layer in cross-flow (Q2729139)

This paper considers the steady forced convection heat transfer from a horizontal circular cylinder covered with an orthotropic porous layer in cross-flow. This class of heat transfer problem is important in many applications, including heat exchangers, hot water and steam pipes, heaters, refrigerators and electrical conductors. The governing equations are first transformed into a set of non-dimensional equations which are then solved numerically using the finite difference method. The resulting system of algebraic equations is solved by employing a numerically stable hybrid scheme. The results are used to investigate in detail the effects of porous layer thickness, radial resistance, tangential resistance, and incoming flow Reynolds number on the average Nusselt number. The authors find that the average Nusselt number decreases up to 40 per cent at high values of Reynolds number. Also, the reduction in the average Nusselt number is predominately due to the changes in the tangential resistance parameter; the radial resistance parameter has little effect on the average Nusselt number.