Study on the Value of Prandtl Number in Turbulent Buoyant Jet

In the study of heat flow with buoyancy by using a k-e model,the value of Prandtl number can affect the computed distributions of velocity and temperature.Based on the value range for Prandtl number suggested by experiments,how different values of Prandtl number affecting the simulated results was studied qualitatively by using a k-e model under axisymmetric coordinate.Results indicated that the value of Prandtl number had little effect on axial velocities and the real velocity value can be well predicted by the model with different values of Prandtl number.However,it affected the distribution of temperature,and a small value of Prandtl number tended to produce an axial temperature smaller than the real value.The reasonable value ranges of turbulent Prandtl number for different Reynold numbers were suggested.The conclusions are valuable for the study of various complicated flows using mathematical models.