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Sabri Ergun

Sabri Ergun (1 March 1918 in Turkey - 18 February 2006) was a chemical engineer.

Additional recommended knowledge

Daily Visual Balance Check

What is the Sensitivity of my Balance?

What is the Correct Way to Check Repeatability in Balances?

He is widely recognized for his enthusiasm and many contributions to the fields of chemical engineering and solid state physics.

Ergun Equation

The Ergun Equation is a correlation derived by Ergun in 1952 for the friction factor in a column as a function of the Reynolds number:

$f_p = \frac {150}{Re_p} + 1.75$

where $f p$ and $R e p$ are defined as

$f_p = \frac{\Delta p}{L} \frac{D_p}{\rho V_s^2} (\frac{\epsilon^3}{1-\epsilon})$ and $Re_p = \frac{D_p V_s \rho}{(1-\epsilon)\mu}$

where: $Δ p$ 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,
$ρ$ is the density of fluid,
$μ$ 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
$ε$ is the void fraction of the bed.