July 31, 2020 at 2:30 pmprajputAnsys EmployeeHow is Prandtl number used for thermal analysis?
July 31, 2020 at 2:31 pmKeyur KanadeAnsys Employee
The Prandtl number defines if the heat conduction (Pr <<1) or convection (Pr>>1) dominates in the process.
July 31, 2020 at 2:31 pmKarthik RAdministratorTrue, consider also that on a different point of view, the Prandtl number indicates when the thermal sub-layer is larger (Pr<1) or thinner (Pr>1) than the viscous sub-layer.
July 31, 2020 at 2:31 pmprajputAnsys EmployeeThank you!! How is the Prandtl number defined?
July 31, 2020 at 2:32 pmKeyur KanadeAnsys Employee
Hello @prajput , The Prandtl number is the ratio of the momentum diffusivity to the thermal diffusivity:
Pr = nu/ alpha
nu is the kinematic viscosity
alpha is the thermal diffusivity
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