bulk local temperature

nimasam · May 20, 2011, 11:37

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, 19:19

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, 01:49

thank you, i will look at it

but my case is in a micro channel

and its laminar !!!

nurjs · November 4, 2015, 13:23

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?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to write k and epsilon before the abnormal end	xiuying	OpenFOAM Running, Solving & CFD	8	August 27, 2013 15:33
Bulk temperature Tf is obtained from total or static temperature?	NPU_conanxie	FLUENT	0	March 30, 2011 05:56
[blockMesh] BlockMeshmergePatchPairs	hjasak	OpenFOAM Meshing & Mesh Conversion	11	August 15, 2008 07:36
IcoFoam parallel woes	msrinath80	OpenFOAM Running, Solving & CFD	9	July 22, 2007 02:58
Could anybody help me see this error and give help	liugx212	OpenFOAM Running, Solving & CFD	3	January 4, 2006 18:07

May 20, 2011, 19:19		#2
kaifu Member Kai Join Date: May 2010 Location: Shanghai Posts: 61 Blog Entries: 1 Rep Power: 15	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, 01:49		#3
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	thank you, i will look at it but my case is in a micro channel and its laminar !!!

November 4, 2015, 13:23		#4
nurjs New Member nurjs Join Date: Oct 2015 Location: Iraq Posts: 11 Rep Power: 10	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?