Nusselt number for a developing turbulent flow in the entrance region

  • #1

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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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  • #2
Nidum
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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 ?
 
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  • #3
Mech_Engineer
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The Nusselt number is the ratio of convective to conductive heat transfer in a flow. It's fundamentally defined as:
[tex]Nu=\frac{h*L}{k}[/tex]
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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