| 单词 | Nusselt |
| 释义 | Nusselt|ˈnʊsəlt|
[the name of E. K. Wilhelm Nusselt (1882–1957), German engineer.]
Nusselt number, 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.
1933W. H. McAdams Heat Transmission iv. 96 hD/k... Nusselt number. 1958Condon & 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. 1974J. 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. |
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