Dittus Boelter coefficient M range

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The discussion centers on the Dittus-Boelter correlation for Nusselt number, specifically questioning the physical possibility of the coefficient M exceeding 1, as the user has encountered a value of 1.12 in their data. Responses indicate that while it is conceptually possible for M to be greater than 1, empirical data typically shows values around 0.8. The user expresses gratitude for the insights and seeks literature recommendations for further study. A suggested resource is "Transport Phenomena" by Bird, Stewart, and Lightfoot. This conversation highlights the complexities of heat transfer correlations and the importance of understanding their parameters.
Martin Beer
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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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Martin Beer said:
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.
In my judgment, it is conceptually possible to get an exponent greater than 1. In practice, as you know, there is abundant data that indicates that it is about 0.8.
 
Thank you for your answer, I really appreciate it. Could you recommend some suitable literature for me to learn more about it?
 
Martin Beer said:
Thank you for your answer, I really appreciate it. Could you recommend some suitable literature for me to learn more about it?
Bird, Stewart, and Lightfoot, Transport Phenomena.
 

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