Fluids

Fluids

I am studying a thermal convection problem and I have a question about it

    • Keyur Kanade
      Ansys Employee
      I am studying a thermal convection problem and I want to identify whether I have natural or forced convection. How can I do it? 
    • Karthik R
      Administrator
      Hello @kkanade , You can use the Richardson number for that. If Ri<<1 you have forced convection, while if Ri>>1 you have natural convection. For Ri≈1 it is mixed convection.
    • Keyur Kanade
      Ansys Employee
      Thank you @Kremella ! How do I calculate it? 
    • Karthik R
      Administrator

      You can calculate it as Ri = Gr/Re^2

      where

      Gr is the Grashof number

      Re is the Reynolds number

      or as Ri = [beta*g*(T_s - T_ref)*L]/V^2

      where

      g is the gravitational acceleration

      beta is the thermal expansion coefficient

      T_s is the (hot) surface temperature

      T_ref is the reference temperature

      L is the characteristic length

      V is the velocity


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