# Nusselt number in tube

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 February 28, 2006, 08:29 Nusselt number in tube #1 A. Al-Zoubi Guest   Posts: n/a Sponsored Links Hi all I want to calculate Nusselt number in a tube.... I use the heat transfer coefficient provided by Star Nu= hcoeff * D/K but I didn't get the right solution. Any hints. Thanks alot

 March 1, 2006, 02:48 Re: Nusselt number in tube #2 PETE Guest   Posts: n/a hcoef seems ok, did you check your TBulk temperature?

 March 1, 2006, 06:42 Re: Nusselt number in tube #3 A. Al-Zoubi Guest   Posts: n/a Thanks alot. I have checked that. I have used T_bulk=Sum(T*u)/Sum(u), the sum goes all over the fluid cells. but It didn't give the right answer in comparison with the analytic solution. Shall I multiply the h_coeff with the circumfincial area (2 Pi D)? or else. Ahmad

 February 14, 2010, 04:50 #4 Member   Mohammad Zakerzadeh Join Date: Dec 2009 Location: Aachen, Germany Posts: 40 Rep Power: 9 Hi guys! My case is very simple , its laminar flow in a pipe with constant wall temperature. I take the length as long as the flow can reach to fully thermally and Hydrodunamically developed. When I get the Nusselt Number from the xyplot/Surface Nusselt Number it can seemed that the Nu begins from a large number(as predicted by theory) and go toward zero at the end of pipe (the theoric value is 3.66). Can anybody help me? I can send my case to you for more information. Thanks alot .

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