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How is Prandtl number used for thermal analysis?

- July 31, 2020 at 2:30 pm
  
  prajput
  Ansys Employee
  
  How is Prandtl number used for thermal analysis?
- July 31, 2020 at 2:31 pm
  
  Keyur Kanade
  Ansys Employee
  
  Hello @prajput
  The Prandtl number defines if the heat conduction (Pr <<1) or convection (Pr>>1) dominates in the process.
- July 31, 2020 at 2:31 pm
  
  Karthik Remella
  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.
- July 31, 2020 at 2:31 pm
  
  prajput
  Ansys Employee
  
  Thank you!! How is the Prandtl number defined?
- July 31, 2020 at 2:32 pm
  
  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

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