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Stanton number : ウィキペディア英語版
Stanton number

The Stanton number, ''St'', is a dimensionless number that measures the ratio of heat transferred into a fluid to the thermal capacity of fluid. The Stanton number is named after Thomas Edward Stanton (1865–1931).〔(The Victoria University of Manchester’s contributions to the development of aeronautics )〕 It is used to characterize heat transfer in forced convection flows.
St = \frac = \frac
where
*''h'' = convection heat transfer coefficient
* ''ρ'' = density of the fluid
*''cp'' = specific heat of the fluid
*''u'' = speed of the fluid
It can also be represented in terms of the fluid's Nusselt, Reynolds, and Prandtl numbers:
:\mathrm = \frac\,\mathrm}
where
* Nu is the Nusselt number;
* Re is the Reynolds number;
* Pr is the Prandtl number.
The Stanton number arises in the consideration of the geometric similarity of the momentum boundary layer and the thermal boundary layer, where it can be used to express a relationship between the shear force at the wall (due to viscous drag) and the total heat transfer at the wall (due to thermal diffusivity).
==References==



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