MASS TRANSFER TO A ROTATING SPHERE IN AN AXIAL STREAM

Abstract

The average and local mass transfer coefficients for a rotating sphere in an axial stream were measured by an electrochemical method over a range of Re_r from 10³ to 5 × 10⁴ and four kinds of Re_r. Fifteen isolated electrodes were used to obtain the local mass transfer rate. The convective diffusion equation for laminar boundary layer on the sphere was solved by the Lighthill transformation on the basis of numerically calculated shear stress distribution by the series expansion method. The numerical results, using the measured mainstream velocity, were in good agreement with the experimental ones over the laminar boundary layer region except very near the separation point.