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.
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Equation
where
where:
Extension
The extension of the Ergun equation to fluidized beds is discussed by Akgiray and Saatçı (2001). To calculate the pressure drop in a given reactor, the following equation may be deduced
This arrangement of the Ergun equation makes clear its close relationship to the simpler Kozeny-Carman equation which describes laminar flow of fluids across packed beds.