摘要
The turbulent flow of vertical round plume with temperature variation and round jet without temperature variation were studied. The k-Ε model with the effect of buoyancy on turbulent kinetic energy and its dissipation rate was adopted. There were similarity solutions in the uniform environment for the system of equations including the equation of continuity, the equations of vertical momentum and heat flux, and the equations of k, Ε. The finite analytic method was applied to obtain the similarity solution. The calculated data of velocity and temperature distribution for round plumes were in good agreement with the experimental data at Prt=0.4. It shows that the present model is good, i.e., the effect of buoyancy on turbulent kinetic energy and its dissipation rate and the conservation of momentum and heat flux should be taken into account, while in previous works these factors were neglected.
The turbulent flow of vertical round plume with temperature variation and round jet without temperature variation were studied. The k-Ε model with the effect of buoyancy on turbulent kinetic energy and its dissipation rate was adopted. There were similarity solutions in the uniform environment for the system of equations including the equation of continuity, the equations of vertical momentum and heat flux, and the equations of k, Ε. The finite analytic method was applied to obtain the similarity solution. The calculated data of velocity and temperature distribution for round plumes were in good agreement with the experimental data at Prt=0.4. It shows that the present model is good, i.e., the effect of buoyancy on turbulent kinetic energy and its dissipation rate and the conservation of momentum and heat flux should be taken into account, while in previous works these factors were neglected.
