Nusselt number for a developing turbulent flow in the entrance region

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SUMMARY

The Nusselt number (Nu) for developing turbulent flow in the entrance region of a duct can be calculated using the formula Nu = (h * L) / k, where 'h' is the convective heat transfer coefficient, 'L' is the characteristic length, and 'k' is the thermal conductivity. The calculation of the Nusselt number is influenced by various parameters including the Rayleigh number, convection type (forced or free), and geometric factors. Empirical correlations for Nusselt number in pipe flow are available, which can aid in determining the convective coefficient for specific applications. For further information, refer to the Wikipedia page on Nusselt Number in Forced Convection for Turbulent Pipe Flow.

PREREQUISITES
  • Understanding of heat transfer principles, specifically convective and conductive heat transfer.
  • Familiarity with the Nusselt number and its significance in fluid dynamics.
  • Knowledge of empirical correlations used in thermal analysis of duct flows.
  • Basic grasp of flow parameters such as Rayleigh number and convection types.
NEXT STEPS
  • Research empirical correlations for Nusselt number in turbulent pipe flow.
  • Learn how to calculate the convective heat transfer coefficient 'h' for various applications.
  • Explore the impact of Rayleigh number on heat transfer in duct flows.
  • Investigate the differences between forced and free convection in thermal analysis.
USEFUL FOR

Engineers, thermal analysts, and researchers involved in fluid dynamics and heat transfer applications, particularly those focusing on duct flow systems.

Fady Alphons
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Anyone knows if i can calculated Nusselt number for a developing turbulent flow in the entrance region for a duct/ tube?
 
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Not my specialist field but I tried putting literally ' Nusselt number for a developing turbulent flow in the entrance region for a duct ' into Google and obtained some useful and relevant information .

Have you even tried this ?
 
Last edited:
The Nusselt number is the ratio of convective to conductive heat transfer in a flow. It's fundamentally defined as:
Nu=\frac{h*L}{k}
The Nusselt number depends on the convection flow's parameters, sometimes summarized in the convective coefficient "h". Your options are to calculate the convective coefficient for your application, or sometimes correlations are developed which use the flow parameters (such as Rayleigh number, forced vs. free convection, geometry aspects, etc.)

Wikipedia lists a couple of emprically-derived equations under the topic of Nusselt number for pipe flow, take a look here: Wikipedia: Nusselt Number- Forced Convection in Turbulent Pipe Flow
 

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