Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time) ?
Correct answer: C. (4De/πt)1/2
- A. (De.t)1/2
- B. (De/t)1/2
- C. (4De/πt)1/2
- D. (4De/t)
Explanation
Higbie's penetration theory gives k_c = 2√(D_e/πt), which is equivalently √(4D_e/πt). The coefficient decreases with longer contact time because the concentration boundary layer becomes thicker.
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