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February 8, 2013, 05:24 |
Reference value and Nusselt number
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#1 |
New Member
shayan
Join Date: Jul 2012
Location: Australia
Posts: 27
Rep Power: 13 |
Hello guys
I have simulated a 2D smooth channel with the following boundary conditions and geometry: -Overall length: 450mm -Entrance length: 300mm (to be sure about fully-developed region) -Channel height: 10mm -Channel width: 180mm -from 300 to 410mm , the wall is at the temperature of 450K (Test Section) -the wallls out of the test section are insulated -inlet Temp=300K (air) After running the program, I had to change the "reference value length" to get logical Nusselt number!! I found the length about 13mm!!( I don't know why?!) 1. Does anybody exactly know about the adjustment in Ref. Value panel? 2. When I changed the working fluid to "water" I saw a huge decrease in Nusselts number with the same boundary conditions!! Do you know why? Help please! Thanks in advance. |
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