calculate avg nusselt no. for 2d convective heat transfer problem

saurabhg2014 · August 20, 2014, 10:43

My problem is related to convective heat transfer in 2d lid cavity. left wall is taken as lid. i am trying to calculate nusselt number in following way, correct me if i am doing it in wrong way.
1) Nu = hL/k , h=q/(Th-Tc)
2)i took value of q of lid wall from surface integrals<area weighted avg<wall flux<total surface heat flux.
3)then calculate value of h and then calculate value of Nu by putting value of h and k(of fluid).

Is it correct?

fadhel · August 20, 2014, 19:37

Yes it's correct, but becareful if you are measuring Total average Nu number or local Nu number

saurabhg2014 · August 25, 2014, 06:14

Thank you for your response. I am measuring avg nusselt number along a wall. I have calculated surface integral of heat flux through wall, that means average nusselt number.. Is it so?

August 20, 2014, 10:43	calculate avg nusselt no. for 2d convective heat transfer problem	#1
saurabhg2014 New Member saurabh gupta Join Date: Jun 2014 Posts: 9 Rep Power: 12	My problem is related to convective heat transfer in 2d lid cavity. left wall is taken as lid. i am trying to calculate nusselt number in following way, correct me if i am doing it in wrong way. 1) Nu = hL/k , h=q/(Th-Tc) 2)i took value of q of lid wall from surface integrals<area weighted avg<wall flux<total surface heat flux. 3)then calculate value of h and then calculate value of Nu by putting value of h and k(of fluid). Is it correct?

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August 20, 2014, 19:37		#2
fadhel New Member f_alafoo Join Date: Jun 2013 Location: Bahrain Posts: 2 Rep Power: 0	Yes it's correct, but becareful if you are measuring Total average Nu number or local Nu number

August 25, 2014, 06:14		#3
saurabhg2014 New Member saurabh gupta Join Date: Jun 2014 Posts: 9 Rep Power: 12	Thank you for your response. I am measuring avg nusselt number along a wall. I have calculated surface integral of heat flux through wall, that means average nusselt number.. Is it so?