Question

The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

a.

D/a

b.

D/2a

c.

proportional to √D

d.

dependent on the Reynolds number

Answer: (d).dependent on the Reynolds number

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Q. The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

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