LIQUID-PHASE MASS-TRANSFER ENHANCEMENT BY GAS EVOLUTION AT INCLINED PLATES

The limiting current technique has been employed to determine mass tra nsfer coefficients at vertical and inclined plates with stirring by co planar electrochemical oxygen evolution. Orientation of the plate has been varied from - 45 (down-facing inclined position) to + 45 (up-faci ng inclined position) at ten intervals. At a constant oxygen evolution rate, maximum mass transfer enhancement was achieved at down-facing i nclined orientations where 0 (the angle from vertical) is small. The i nclination angle at which mass transfer attained its highest value dep ended on the oxygen evolution rate and is given by theta(max) = a + 10 .96 log I(g) where I(g)(mA) is the electrochemical current for the oxy gen evolution. For the range of the inclination angle, theta less-than -or-equal-to theta greater-than-or-equal-to theta(max), the relationsh ip between the mass transfer coefficient and theta can be represented by K = K(o) + aK(o)(sin theta)0.3 where K(o) is the mass transfer coef ficient at the vertical plate.