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Nusselt Number

`Nu = ( h * D )/ k `
`"Heat Transfer Coefficient"`
`"Inside Diam of Tube"`
`"Fluid Thermal Conductivity"`
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This equation pertains to heat transfer phenomena at a boundaries.  A particular case of this heat transfer occurs a the surface of turbulent flow through circular tubes. The Nusselt number (Nu) is defined as the ratio of convective to conductive heat transfer at (normal to) these boundaries.