![]() Note: For ideal gases, the properties cp, k, m, and Pr are independent of pressure. ![]() Prandtl Number of Air Prandtl Number of Dry air at 1 atm pressure: Temp, C Temp, F Temp, K Prandtl The values of μ, cp and k are only very weak functions of pressure so the Prandtl number presumed independent of pressure. The values of μ, cp and k are acknowledged to change with temperature consequently the Prandtl number will change with temperature. K is thermal conductivity, (SI units: W/m ![]() Α is the thermal diffusivity, α = k / (ρ cp). Μ is dynamic viscosity, (SI units: Pa s = N s/m2). ![]()
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