expression for calulation of average nusselt number in cfx

mehyan · December 8, 2015, 16:14

dear friends,

would u do me a favor,
i realy stoped whit a problem,

i do not know exactly how i can create a expression for average nusselt number,
somebody says it like below but i still could not understand their meaning:

Replace nuL= (Wall Heat Flux *shoa*2[m])/(75 [K]*Thermal Conductivity )

with

nuL = areaAve(Wall Heat Flux)@Wall * shoa ..... * areaAve(k)@Wall

could u send me the complete expression of average nusselt number?
(whit obvious explanation so that i could apply it)

i want to use this in double pipe heat exchanger

Thanks in advance.

ghorrocks · December 8, 2015, 16:46

You better understand what Nusselt number is first before you try to derive an equation to calculate it. Have a look in a heat transfer textbook.

And please do not spam me with private messages which are exact copies of posts on the forum. I do not like that.

December 8, 2015, 16:14	expression for calulation of average nusselt number in cfx	#1
mehyan New Member mehran Join Date: Dec 2015 Posts: 10 Rep Power: 10	dear friends, would u do me a favor, i realy stoped whit a problem, i do not know exactly how i can create a expression for average nusselt number, somebody says it like below but i still could not understand their meaning: Replace nuL= (Wall Heat Flux shoa2[m])/(75 [K]Thermal Conductivity ) with nuL = areaAve(Wall Heat Flux)@Wall shoa ..... * areaAve(k)@Wall could u send me the complete expression of average nusselt number? (whit obvious explanation so that i could apply it) i want to use this in double pipe heat exchanger Thanks in advance.

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December 8, 2015, 16:46		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	You better understand what Nusselt number is first before you try to derive an equation to calculate it. Have a look in a heat transfer textbook. And please do not spam me with private messages which are exact copies of posts on the forum. I do not like that.