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August 6, 2013, 00:46 |
Nusselt number calculation
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#1 |
Member
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 13 |
Hello everyone,
I am modelling a rectangular natural circulation loop with isothermal heat source and heat sink and the rest of the surfaces adiabatic.This whole system is isolated from the surroundings. I am using carbon dioxide as a fluid and employing piecewise linear model in the subcritical region of CO2. and have specified uniform wall thickness throughout and enabled the "Shell Conduction" option. I wanted to calculate Nusselt number in the different sections of the geometry like the heating/cooling section.But the default option "Surface Nusselt number" is giving absurd values. I also tried doing it manually where first I created a surface at a specified coordinate;calculated bulk mean temperature and found surface heat flux and area weighted average of 'k'.After that just plugged the values in the formula for Nusselt no. and got a satisfactory value. BUT this whole process is tedious for just ONE Nusselt no. Is there any way to calculate it quickly? Thnx |
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August 7, 2013, 03:26 |
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#2 |
Senior Member
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 732
Rep Power: 22 |
Have you considered writing a UDF or data sampling?
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August 7, 2013, 04:01 |
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#3 |
Member
Prateek Anand
Join Date: Nov 2012
Posts: 34
Rep Power: 13 |
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