Passively Enhancing Convection Heat Transfer Around Cylinder Using Shrouds.*

Natural convection heat transfer around a horizontal cylinder has received~considerable attention through decades since it has been used in several~viable applications. However, investigations into passively enhancement of the free convective cooling using external walls and chimney effect are lacking. In this work, a numerical simulation to study natural convection~from a horizontal cylinder configured with semicircular shrouds with an~expended chimney is employed. The fluid flow and convective heat transfer~around the cylinder are modeled. The bare cylinder is also simulated for~comparison. The present study are aimed at improving our understanding of~the parameters advancing the free convective cooling of the cylinder~implemented with the shrouds configuration. For validation, the present~results for the bare tube are compared with data reported in the literature.~The numerical simulations indicate that applying the shrouds configuration~with extended chimney to a tube promotes the convection heat transfer from~the cylinder. Such a method is less expensive and simpler in design than~other configurations (e.g. utilizing extended surfaces, fins), making the~technology more practical for industrial productions, especially for cooling~systems.