# Best way to calculate bulk fluid temperature in case of steam-water flow

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 September 12, 2023, 04:23 Best way to calculate bulk fluid temperature in case of steam-water flow #1 Member   L S Join Date: Apr 2016 Posts: 63 Rep Power: 10 In order to get Heat Transfer Coefficient, I need to calculate bulk fluid temperature at different axial locations in a pipe flow boiling case. But, the getting bulk fluid temperature in two-phase flow doesn't seem straightaway. So, What will be the best strategy? I am using RPI wall boiling model and post-processing is being done in tecplot. Do I need to do area averaged or mass averaging or other suitable method? how to I combine phase-1 (liquid) and phase-2(vapor) temperatures into one?

 September 13, 2023, 00:33 #2 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,678 Rep Power: 66 Bulk temperature is defined as mass averaged

 September 13, 2023, 00:41 #3 Member   L S Join Date: Apr 2016 Posts: 63 Rep Power: 10 okay. Till now I have understood that mass flow averaged has to be considered. But, that can be found for single phase flow. what about two phase flow at cross section? How mass flow averaged temperature formula works for two-phase?

 September 13, 2023, 01:33 #4 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,678 Rep Power: 66 What happens if you have a glass of water with ice? Bulk temperature was invented exactly to deal with these kinds of scenarios and yet you are questioning how bulk temperature would work as it was intended.

 September 13, 2023, 02:31 #5 Member   L S Join Date: Apr 2016 Posts: 63 Rep Power: 10 I just want to know if following formula is correct or not for bulk fluid temperature: Code: `Tb=(Ti ui ρi Ai + Tj uj ρj Aj)/(ui ρi Ai + uj ρj Aj )` where, Ti=temperature of phase 1 ui=velocity of phase 1 ρi = density of phase 1 Ai = area occupied by phase 1 Same notations are for phase 2 with j. Last edited by silviliril; September 13, 2023 at 02:32. Reason: typing correction

 Tags flow boiling, heat flux, heat tranfer coefficient, rpi model, two-phase flow

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post AlanMattanó Main CFD Forum 0 April 10, 2023 12:16 Ashkan Kashani CFX 3 October 13, 2022 21:36 mxcfd STAR-CCM+ 5 September 16, 2014 05:46 mssound FLUENT 0 May 13, 2010 15:56 fredius,magige,tanzanian,(e.a) Main CFD Forum 0 January 27, 2002 07:10

All times are GMT -4. The time now is 21:33.

 Contact Us - CFD Online - Privacy Statement - Top