Physics Help Forum Dittus Boelter M coefficient range

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 May 26th 2017, 06:17 AM #1 Junior Member   Join Date: May 2017 Posts: 2 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.
 Jun 1st 2017, 01:24 PM #2 Senior Member     Join Date: Jun 2016 Location: England Posts: 376 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... __________________ ~\o/~
 Jun 2nd 2017, 12:13 AM #3 Junior Member   Join Date: May 2017 Posts: 2 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.
 Jun 14th 2017, 12:44 PM #4 Senior Member   Join Date: Jun 2010 Location: NC Posts: 369 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. Jim Pohl

 Tags boelter, coefficient, coefficient m, dittus, range

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