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where
is the
convective heat transfer coefficient of the flow,
is the
characteristic length,
is the
thermal conductivity of the fluid.
For stagnant fluid and laminar flows the Nusselt number is a constant number (OEIS sequence A282581):
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{\rm Nu}=3.66 |
For transient and turbulent flow in pipelines Nusselt number can be estimated through empircal correlation (Gnielinski):
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{\rm Nu}=\frac{ (f/8) \, ({\rm Re} - 1000) {\rm Pr} }{ 1 + 12.7 \, (f/8)^{1/2} \, ({\rm Pr}^{2/3} -1) } |
where
is Parndtl number.
See also
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Physics / Thermodynamics / Heat Transfer
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