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

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Hayder Jaffal

Re=0

Abderrahim Wakif

Ri=Gr/(Re×Re)>10

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

https://en.m.wikipedia.org/wiki/Richardson_number

Thanks Dr Abderrahim Wakif

Dear Dr. Khaled

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

لا شكر على واجب أستاذ خالد

I am thankful for your efforts Dr Hayder Jaffal

نتشرف بمعرفتكم دكتور عبدالرحيم

Dear Michael Nitsas

Thanks for share your information with us

Anees Naji

Interesting