Fluids

Fluids

How is Prandtl number used for thermal analysis?

    • prajput
      Ansys Employee
      How is Prandtl number used for thermal analysis?
    • Keyur Kanade
      Ansys Employee

      Hello @prajput

      The Prandtl number defines if the heat conduction (Pr <<1) or convection (Pr>>1) dominates in the process.

    • Karthik R
      Administrator
      True, 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.
    • prajput
      Ansys Employee
      Thank you!! How is the Prandtl number defined?
    • Keyur Kanade
      Ansys Employee

      Hello @prajput , The Prandtl number is the ratio of the momentum diffusivity to the thermal diffusivity:

      Pr = nu/ alpha

      where

      nu is the kinematic viscosity

      alpha is the thermal diffusivity

Viewing 4 reply threads
  • You must be logged in to reply to this topic.