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.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.
Bird, Stewart, and Lightfoot, Transport Phenomena.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?
The Dittus Boelter coefficient M range is a dimensionless number used in heat transfer calculations to determine the convective heat transfer coefficient between a fluid and a solid surface.
The Dittus Boelter coefficient M range is calculated using the Reynolds number, Prandtl number, and the ratio of the fluid's specific heat to the wall's thermal conductivity. The formula is M = (Re)^(0.8) * (Pr)^(1/3).
The Dittus Boelter coefficient M range is used to determine the convective heat transfer coefficient, which is an essential parameter in heat transfer calculations. It helps to determine the rate of heat transfer between a fluid and a solid surface.
The range of values for the Dittus Boelter coefficient M range is typically between 0.5 and 0.8 for laminar flow and between 0.2 and 0.4 for turbulent flow.
The Dittus Boelter coefficient M range can vary significantly depending on the fluid properties and surface characteristics. For example, it is higher for fluids with higher Prandtl numbers and for rougher surfaces. It also varies with the flow regime, with higher values for turbulent flow compared to laminar flow.