EDDY NUMBER-DISTRIBUTION IN ISOTROPIC TURBULENCE AND ITS APPLICATION FOR ESTIMATING MASS-TRANSFER COEFFICIENTS

The eddy number distribution for isotropic turbulent flows has been de rived by manipulating well-established formulae for describing turbule nce. The distribution has been used to derive an expression relating t he fractional rate of surface renewal, and hence mass transfer coeffic ients across gas-liquid interfaces, to key process variables such as t he local energy dissipation rate and the Kolmogorov scale. The express ion has been compared with the previously published roll-cell and eddy -cell models, which were applied to correlating local mass transfer co efficients in a pipe and an open absorption channel. Excellent agreeme nt has been found. The expression has also been applied to correlating the gas-side mass transfer coefficients for liquid evaporation in wet ted wall pipe hows, and the mass transfer coefficient for solid dissol ution adjacent to a solid-liquid interface in a stirred tank. The theo retical correlations have been validated by published experimental dat a.