Direct numerical simulations of three-dimensional flow and augmented heat transfer in a symmetrically grooved channel with constant temperature walls

Direct numerical simulations of three-dimensional flow and augmented convective heat transfer in a rectangular channel with symmetric, transverse grooves on two opposite walls are performed using the spectral element technique. The walls of the channel have constant temperature boundary conditions. Solutions for the periodically fully-developed flow regime are calculated by a method employing a normalized temperature profile.; Results are presented for a Prandtl number of 0.7 and a Reynolds number range 180 {dollar}{dollar} 800), while two-dimensional simulations incorrectly predict laminar-like behavior. Nusselt numbers predicted from three-dimensional simulations are somewhat higher than experimentally measured values.