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A gas bubble of diameter 3 mm is rising in a pool of a liquid

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A gas bubble of diameter 3 mm is rising in a pool of a liquid. What is the mass transfer coefficient if the diffusion coefficient is 2 × 10−5 cm2/s?

Note that the contact time is needed for finding the mass transfer coefficient. One way of approximating this is Contact time = Bubble diameter Rise velocity The rise velocity can be calculated using Stokes’ law (discussed in Section 4.4). Small bubbles are spherical and Stokes’ law is a reasonable approximation here.