Buoyancy Effects on Developing Laminar Gas Flow and Heat Transfer in a Rectangular Fuel Cell Duct

摘要: Using a general 3-D finite-volume code, the development of buoyancy force driven secondary flow and its effects on developing laminar heat transfer have been numerically simulated for horizontal fuel cell duct with rectangular cross section. The constant thermal-properties assumption except linear density variation temperature in body term is applied, flux prescribed bottom wall, while thermal insulation implemented other three walls. forms vortices that can disrupt both hydrodynamic boundary layer enhance friction factor transfer. Calculations performed to determine various Grashof number Gr* Reynolds Re. Comparisons these numerical results available existing data are presented. This study may be regarded as an improved modeling procedure gas convective ducts. (Less)