Numerical Modeling of Flow Laminarization in Channels with a Negative Pressure Gradient

Abstract

The flow and heat transfer in channels with a negative pressure gradient are numerically simulated using a three-parameter differential RANS turbulence model supplemented with a transfer equation for a turbulent heat flux. The flow in a planar converging channel with a small wall inclination angle is considered in a wide range of Reynolds numbers. Heat transfer in the flow of a helium-xenon gas mixture in a heated pipe is studied in a wide range of heat fluxes into the pipe wall. The flow acceleration parameter that ensures laminarization of the turbulent flow in the channel is estimated.