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Nusselt number
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nature : a reflection on the strength of convective heat dimensionless number. Yes heat transfer coefficient alpha and membrane characteristic length L divided by the product of fluid λ thermal conductivity of the few groups. Definition : Nu = α L / λ. L for heat transfer surface of the geometric characteristics of length (such as tubular heat exchanger, may be the pipe diameter or radius), the unit is meters; Alpha unit of W / (m 2 open); Λ units watts (meter). Written expressions Nu = α / α * , e Nu can see the physical meaning, in which α * λ / L, equivalent heat transfer process thermal conduction only way the heat transfer coefficient points. Heat transfer can be calculated from Nu strike heat transfer coefficient alpha membrane.


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