Nusselt numbern.

Brit.

/ˈnʊsəlt ˌnʌmbə/, U.S.

/ˈnəsəlt ˌnəmbər/

Origin: From a proper name, combined with an English element. Etymons: proper name Nusselt , number n.

Etymology: < the name of E. K. Wilhelm Nusselt (1882–1957), German engineer, who proposed the parameter in 1915 ( Gesundheits-Ingenieur 38 480, 490) + number n.

Physics.

A dimensionless parameter used in calculations of the heat transfer between a moving fluid and a solid, equivalent to hD/k, where h is the rate of heat loss per unit area per degree difference in temperature between the body and its surroundings, D is a characteristic length of the body, and k is the thermal conductivity of the fluid. Abbreviated Nu.

ΚΠ

1933 W. H. McAdams Heat Transmission iv. 96 hD/k... Nusselt number.

1958 E. U. Condon & H. Odishaw Handbk. Physics iii. ii. 35/1 For low speeds the Nusselt number is a function of the Reynolds number, the Prandtl (or Péclet) number, and the Grashof number... In the case of forced convection, for which gravitational effects are insignificant, the Nusselt number is a function only of the Reynolds number and of the Prandtl number. In natural (free) convection the Nusselt number is a function only of the Grashof number and of the Prandtl number.

1974 J. R. Welty Engin. Heat Transfer v. 265 Heat Transfer for Cylinders in Crossflow... At higher Reynolds numbers..the Nusselt number experiences two sudden increases, one at the separation point and one where the boundary layer undergoes a transition from laminar to turbulent flow.

1991 Acta Metallurgica et Materialia 39 2936/1 In order to use existing solutions for the diffusion field surrounding a moving particle in a fluid, it is convenient to define an average mass transfer Nusselt number.

This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022).

单词	nusselt number
释义	Nusselt numbern. Brit. /ˈnʊsəlt ˌnʌmbə/, U.S. /ˈnəsəlt ˌnəmbər/ Origin: From a proper name, combined with an English element. Etymons: proper name Nusselt , number n. Etymology: < the name of E. K. Wilhelm Nusselt (1882–1957), German engineer, who proposed the parameter in 1915 ( Gesundheits-Ingenieur 38 480, 490) + number n. Physics. A dimensionless parameter used in calculations of the heat transfer between a moving fluid and a solid, equivalent to hD/k, where h is the rate of heat loss per unit area per degree difference in temperature between the body and its surroundings, D is a characteristic length of the body, and k is the thermal conductivity of the fluid. Abbreviated Nu. ΚΠ 1933 W. H. McAdams Heat Transmission iv. 96 hD/k... Nusselt number. 1958 E. U. Condon & H. Odishaw Handbk. Physics iii. ii. 35/1 For low speeds the Nusselt number is a function of the Reynolds number, the Prandtl (or Péclet) number, and the Grashof number... In the case of forced convection, for which gravitational effects are insignificant, the Nusselt number is a function only of the Reynolds number and of the Prandtl number. In natural (free) convection the Nusselt number is a function only of the Grashof number and of the Prandtl number. 1974 J. R. Welty Engin. Heat Transfer v. 265 Heat Transfer for Cylinders in Crossflow... At higher Reynolds numbers..the Nusselt number experiences two sudden increases, one at the separation point and one where the boundary layer undergoes a transition from laminar to turbulent flow. 1991 Acta Metallurgica et Materialia 39 2936/1 In order to use existing solutions for the diffusion field surrounding a moving particle in a fluid, it is convenient to define an average mass transfer Nusselt number. This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022). < n.1933
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