Prandtl numbern.

Brit.

/ˈprantl ˌnʌmbə/, U.S.

/ˈprændl ˌnəmbər/

Forms:

α. 1900s– Prandtl number.

β. 1900s– Prandtl's number (rare).

Origin: From proper names, combined with an English element. Etymons: proper name Prandtl , number n.

Etymology: < the name of Ludwig Prandtl (1875–1953), German physicist, who did fundamental work in this field (published notably in Physikalische Zeitschr. 11 (1910) 1072–78) + number n. In β form < the genitive of Prandtl + number n.

Physics.

A dimensionless parameter used in calculations of heat transfer between a moving fluid and a solid body.The Prandtl number (commonly written Pr or σ) for a given fluid is equal to c_pv/k, where c_p is the heat capacity of unit volume of the fluid, v is its kinematic viscosity, and k its thermal conductivity.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > calculation of transfer

Prandtl number1933

1933 W. H. McAdams Heat Transmission iv. 96 Prandtl number = 1/Stanton group.

1960 Electrochimica Acta 3 233 Prandtl's number, which plays in heat transfer the same role as the Schmidt number in mass transfer.

1974 F. M. White Viscous Fluid Flow ii. 84 Liquid metals have [a] very small Prandtl number, gases slightly less than unity, thin liquids somewhat higher than unity, and oils a very large value of Pr.

1993 Jrnl. Petrol. 34 362 Simple Stokes' law settling is possible only under static conditions, which are generally rare in geological situations, as magmas have Rayleigh and Prandtl numbers several orders of magnitude higher than the threshold for time-dependent (turbulent) convection.

2005 Physical Rev. E. 71 Art. 016301. 1 We are able to obtain..steady convection in the form of a single giant spiral roll covering the whole spherical shell which is stable and robust for a wide range of the Prandtl number.

This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	prandtl number
释义	Prandtl numbern. Brit. /ˈprantl ˌnʌmbə/, U.S. /ˈprændl ˌnəmbər/ Forms: α. 1900s– Prandtl number. β. 1900s– Prandtl's number (rare). Origin: From proper names, combined with an English element. Etymons: proper name Prandtl , number n. Etymology: < the name of Ludwig Prandtl (1875–1953), German physicist, who did fundamental work in this field (published notably in Physikalische Zeitschr. 11 (1910) 1072–78) + number n. In β form < the genitive of Prandtl + number n. Physics. A dimensionless parameter used in calculations of heat transfer between a moving fluid and a solid body.The Prandtl number (commonly written Pr or σ) for a given fluid is equal to c_pv/k, where c_p is the heat capacity of unit volume of the fluid, v is its kinematic viscosity, and k its thermal conductivity. ΘΚΠ the world > matter > physics > electromagnetic radiation > heat > transmission of heat > [noun] > calculation of transfer Prandtl number1933 1933 W. H. McAdams Heat Transmission iv. 96 Prandtl number = 1/Stanton group. 1960 Electrochimica Acta 3 233 Prandtl's number, which plays in heat transfer the same role as the Schmidt number in mass transfer. 1974 F. M. White Viscous Fluid Flow ii. 84 Liquid metals have [a] very small Prandtl number, gases slightly less than unity, thin liquids somewhat higher than unity, and oils a very large value of Pr. 1993 Jrnl. Petrol. 34 362 Simple Stokes' law settling is possible only under static conditions, which are generally rare in geological situations, as magmas have Rayleigh and Prandtl numbers several orders of magnitude higher than the threshold for time-dependent (turbulent) convection. 2005 Physical Rev. E. 71 Art. 016301. 1 We are able to obtain..steady convection in the form of a single giant spiral roll covering the whole spherical shell which is stable and robust for a wide range of the Prandtl number. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). < n.1933
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