For open channel fluid flow; at any Re can amusing the heat convection is natural???
Re=0
Ri=Gr/(Re×Re)>10
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
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