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NUSSELT NUMBER

DOI: 10.1615/AtoZ.n.nusselt_number

Nusselt number, Nu, is the dimensionless parameter characterizing convective heat transfer. It is defined as

where α is convective heat transfer coefficient, L is representative dimension (e.g., diameter for pipes), and λ is the thermal conductivity of the fluid. Nusselt number is a measure of the ratio between heat transfer by convection (α) and heat transfer by conduction alone (λ/L).

Convective heat transfer relationships are usually expressed in terms of Nusselt number as a function of Reynolds Number and Prandtl Number.

REFERENCES

Hewitt, G. F., Shires, G. L. and Bott, T. R. (1994) Process Heat Transfer, CRC Press, Boca Raton, FL.

References

  1. Hewitt, G. F., Shires, G. L. and Bott, T. R. (1994) Process Heat Transfer, CRC Press, Boca Raton, FL.
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