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preface to fifteenth edition

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2.22 SECTION 2<br />

TABLE 2.2<br />

Physical and Chemical Symbols and Definitions (Continued)<br />

N. Transport properties (continued)<br />

Name Symbol SI unit Definition<br />

Thermal diffusivity a m 2 ·s 1 a /c p<br />

Thermal resistance R K·W 1 R 1/G<br />

Volume flow rate q v , V m 3 ·s 1 q v dV/dt<br />

Dimensionless quantities:<br />

Alfvén number<br />

Al Al () 1/2 /B<br />

Cowling number Co Co B 2 / 2<br />

Euler number Eu Eu p/ 2<br />

Fourier number Fo Fo at/l 2<br />

Fourier number for mass Fo* Fo* Dt/l 2<br />

transfer in binary<br />

mixtures<br />

Froude number Fr Fr /(lg) 1/2<br />

Grashof number Gr Gr l 3 go T 2 / 2<br />

Grashof number for mass Gr*<br />

Gr* l 3 g (/x) T,p (x/)<br />

transfer in binary<br />

mixtures<br />

Hartmann number Ha Ha Bl(/) 1/2<br />

Knudsen number Kn Kn /l<br />

Lewis number Le Le a/D<br />

Mach number Ma Ma /c<br />

Magnetic Reynolds Rm, Re m<br />

Rm l<br />

number<br />

Nusselt number Nu Nu hl/k<br />

Nusselt number for mass Nu*<br />

Nu* k d l/D<br />

transfer in binary<br />

mixtures<br />

Péclet number Pe Pe l/a<br />

Péclet number for mass Pe*<br />

Pe* l/D<br />

transfer in binary<br />

mixtures<br />

Prandtl number Pr Pr /a<br />

Rayleigh number Ra Ra l 3 g T/a<br />

Reynolds number Re Re l/<br />

Schmidt number Sc Sc /D<br />

Sherwood number Sh Sh k d l/D<br />

Stan<strong>to</strong>n number St St h/c p<br />

Stan<strong>to</strong>n number for mass St* St* k d /<br />

transfer in binary<br />

mixtures<br />

Strouhal number Sr Sr lf/<br />

Weber number We We 2 l/<br />

Symbols used in the definitions of dimensionless quantities:<br />

Acceleration of free fall g Pressure p<br />

Area A Speed <br />

Cubic expansion coefficient Speed of sound c<br />

Density Surface tension <br />

Frequency f Temperature T<br />

Length l Time t<br />

Mass m Viscosity <br />

Mean free path Volume V<br />

Mole fraction<br />

x

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