bulk local temperature

nimasam · May 20, 2011, 12:37

hi foamer
i would like to calculate nusselt in axisymmetric pipe, T reference in nusselt equation is local bulk mean temperature, how can i calculate it?

kaifu · May 20, 2011, 20:19

The bulk temperature is usually calculated by setting y+=250 in turbulent wall temperature function.

you may find some clue at
B.U. Bae, H.Y. Yoon, D.J. Euh, C.H. Song and G.C. Park, Computational analysis of a subcooled boiling ow with a one-group interfacial area transport equation", J. Nucl. Sci. Technol. 45, 341 (2008)

nimasam · May 21, 2011, 02:49

thank you, i will look at it

but my case is in a micro channel

and its laminar !!!

nurjs · November 4, 2015, 14:23

hi, to calculate bulk temperature you create a plane and calculate mass weighted average of temperature in this plane.
i hope it help you.
i has a problem in my results can any one help me?
i has a micro channel and i calculate bulk and average temperature in order to calculate Nu on a micro channel. my problem is that i obtained a bulk temperature larger than average temperature which lead to negative Nu value. can any one help me?

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May 20, 2011, 20:19		#2
kaifu Member Kai Join Date: May 2010 Location: Shanghai Posts: 61 Blog Entries: 1 Rep Power: 16	The bulk temperature is usually calculated by setting y+=250 in turbulent wall temperature function. you may find some clue at B.U. Bae, H.Y. Yoon, D.J. Euh, C.H. Song and G.C. Park, Computational analysis of a subcooled boiling ow with a one-group interfacial area transport equation", J. Nucl. Sci. Technol. 45, 341 (2008)

May 21, 2011, 02:49		#3
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,267 Blog Entries: 1 Rep Power: 25	thank you, i will look at it but my case is in a micro channel and its laminar !!!

November 4, 2015, 14:23		#4
nurjs New Member nurjs Join Date: Oct 2015 Location: Iraq Posts: 11 Rep Power: 11	hi, to calculate bulk temperature you create a plane and calculate mass weighted average of temperature in this plane. i hope it help you. i has a problem in my results can any one help me? i has a micro channel and i calculate bulk and average temperature in order to calculate Nu on a micro channel. my problem is that i obtained a bulk temperature larger than average temperature which lead to negative Nu value. can any one help me?