BASIC EQUATIONS OF TURBULENT-FLOW FOR VARIABLE-DENSITY AND VARIABLE VISCOSITY NEWTONIAN FLUID IN OPEN-CHANNEL

In this paper, using Navier-Stokes equations and Reynolds time-average d rules, the turbulent motional differential equations of variable den sity and variable viscosity Newtonian fluid have been presented, and t he turbulent motional differential equations of variable density and v ariable viscosity Newtonian fluid in open channel have been further pr oposed. The concepts of the density turbulence stress and the viscosit y turbulence stress have been firstly presented in the paper.