Nusselt Number

jlx · January 11, 2011, 22:13

I use Fluent to analyze flow in a flat duct. After calculation, I wanna get Nusselt Number.I have try to get the surface Nusselt number from the plot>xyplot,choose y axis function with wall fluxes, and get the surface Nusselt Number under wall fluxes, but is seems weird. The surface Nusselt Number always appears zero.
After I get the Nusselt Number, I wanna plot the Nusselt Number with X*(dimensionless axial coordinate for the thermal entrance region)

How can I get this plot.Please tell me.

Thx all.

jlx · January 13, 2011, 00:19

Can anyone give me some information?
Thanks

mettler · January 14, 2011, 14:30

I think you might be getting zero because your two temperatures are equal, thus giving a zero 'h'. I would think that you can find the local convective coefficient and then calculate Nu...maybe

January 11, 2011, 22:13	Nusselt Number	#1
jlx New Member Junling Xie Join Date: Jan 2011 Posts: 3 Rep Power: 15	I use Fluent to analyze flow in a flat duct. After calculation, I wanna get Nusselt Number.I have try to get the surface Nusselt number from the plot>xyplot,choose y axis function with wall fluxes, and get the surface Nusselt Number under wall fluxes, but is seems weird. The surface Nusselt Number always appears zero. After I get the Nusselt Number, I wanna plot the Nusselt Number with X*(dimensionless axial coordinate for the thermal entrance region) How can I get this plot.Please tell me. Thx all.

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January 13, 2011, 00:19		#2
jlx New Member Junling Xie Join Date: Jan 2011 Posts: 3 Rep Power: 15	Can anyone give me some information? Thanks

January 14, 2011, 14:30		#3
mettler Senior Member Andrew Join Date: Mar 2009 Location: Washington, DC Posts: 211 Rep Power: 18	I think you might be getting zero because your two temperatures are equal, thus giving a zero 'h'. I would think that you can find the local convective coefficient and then calculate Nu...maybe