(Solution) - Film model for spheres derive the results that correspond to -(2025 Original AI-Free Solution)

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Film model for spheres derive the results that correspond to Eqs. 22.8-3, 4 for simultaneous heat and mass transfer in a system with spherical symmetry that is, assume a spherical mass transfer surface and assume that T and xA depend only on the radial coordinate r. Show that Eqs. 22.8-7 and 8 do not need to be changed. What difficulties would be encountered if one tried to use the film theory to calculate the drag on a sphere?