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Ergun equation : ウィキペディア英語版
Ergun equation
The Ergun equation, derived by the Turkish chemical engineer Sabri Ergun in 1952, expresses the friction factor in a packed column as a function of the modified Reynolds number.
==Equation==

f_p = \frac + 1.75

where f_p and Gr_p are defined as
f_p = \frac \frac \left(\frac\right) and Gr_p = \frac
where:
Gr_p is the modified Reynolds number,
\Delta p is the pressure drop across the bed,
L is the length of the bed (not the column),
D_p is the equivalent spherical diameter of the packing,
\rho is the density of fluid,
\mu is the dynamic viscosity of the fluid,
v_s is the superficial velocity (i.e. the velocity that the fluid would have through the empty tube at the same volumetric flow rate), and
\epsilon is the void fraction of the bed (bed porosity at any time).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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