thiele modulus

How is the Thiele Modulus Defined?

The Thiele modulus is defined as:
\[ \phi = L \sqrt{\frac{k}{D}} \]
where:
- \(L\) is the characteristic length of the catalyst particle (e.g., radius for a spherical particle),
- \(k\) is the reaction rate constant,
- \(D\) is the effective diffusivity of the reactant inside the pores.

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