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explain variable in nusselt number

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Akbar Rahman 2023-05-08 17:29:40 +01:00
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uni/mmme/2047_thermodynamics_and_fluid_dynamics/heat_transfer.md
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@ -72,11 +72,12 @@ Nusselt number is a dimensionless number:
$$\text{Nu} = \frac{hL}{k_f}$$ $$\text{Nu} = \frac{hL}{k_f}$$
where $k_f$ is conductivity of the fluid, $L$ is the representative length (e.g. diameter, length, where $k_f$ is conductivity of the fluid, $L$ is the representative length (e.g. diameter, length,
internal width, etc.). internal width, etc.), and $h$ is heat transfer coefficient.
Since $h$ is unknown a lot of the time, sometimes Nusselt number must be found through approximating Since $h$ is unknown a lot of the time, sometimes Nusselt number must be found through approximating
by other dimensionless numbers: Prandtl, Reynolds, and Grashof. by other dimensionless numbers: Prandtl, Reynolds, and Grashof.
Nusselt number for a laminar forced flow is around 3.66. Nusselt number for a laminar forced flow is around 3.66.
For a turbulent forced flow it is estimated to be: For a turbulent forced flow it is estimated to be: