July 31, 2020 at 2:26 pmKeyur KanadeAnsys EmployeeI am studying a thermal convection problem and I want to identify whether I have natural or forced convection. How can I do it?
July 31, 2020 at 2:26 pmKarthik RAdministratorHello @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.
July 31, 2020 at 2:26 pmKeyur KanadeAnsys EmployeeThank you @Kremella ! How do I calculate it?
July 31, 2020 at 2:27 pmKarthik RAdministrator
You can calculate it as Ri = Gr/Re^2
Gr is the Grashof number
Re is the Reynolds number
or as Ri = [beta*g*(T_s - T_ref)*L]/V^2
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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