For open channel fluid flow; at any Re can amusing the heat convection is natural???

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Khaled Al-Farhany

Many thanks Dr Hayder Jaffal for replay. but if the effect of natural convection more than the effect of Re it could be assumed as Natural convection

Many thanks Dr Abderrahim Wakif for your reply.

This sound seems good to me. Could you please refer me to the reference gives these expression.

regards

Khaled

Hayder Jaffal

Dear Dr. Khaled

For external flow with Pr≤1, the parameter Gr/Re^2 marks which type of convection is dominant natural if >>1