Explanation:
Prandtl member is the ratio of momentum diffusivity to thermal diffusivity.
\(Pr = \frac{\nu }{\alpha } = \frac{\mu }{{\frac{{\rho k}}{{\rho {C_p}}}}} = \frac{{\mu {C_p}}}{k}\)
Typical ranges of Prandtl member is listed below
Fluid |
Pr |
Liquid metals |
0.004 – 0.030 |
Gases |
0.7 – 1.0 |
Water |
1.7 – 13.7 |