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Old May 26th 2017, 05:17 AM   #1
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Dittus Boelter M coefficient range

Hello, I am doing Dittus Boelter correlation for Nusselt number accroding to my measured data. Coefficient (or constant) M that is related to Re has (in my case) value of 1.12. Is it physically possible to get value greater than 1? In my previous research, I've only met with a value of less than one, so I am little bit confused. Thanks for answer.
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Old Jun 1st 2017, 12:24 PM   #2
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Not sure what you are saying but,
If you are indicating that the correlation coefficient is greater than 1 then that does seem to indicate an error.
Generally correlation coefficients are defined to run from 1 to -1
1 being a perfect correlation
0 being no correlation
-1 being perfect reverse correlation.
You can't get better than perfect...
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Old Jun 1st 2017, 11:13 PM   #3
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Hello, Dittus Boelter correlation for Nusselt number has common form Nu = C * Re^M * Pr^N. In my case is M value greater than 1.
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Old Jun 14th 2017, 11:44 AM   #4
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Dittus Boelter

Hi bjorson,

I believe the Dittus Boelter work was done in the 40's war effort.
Are you personally interested in such work or is it an interest of your professor?

I ask because some writings I have from that time need a new home.

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