Abstract
Liquid-phase volumetric coefficients and Peclet numbers in liquid mixing were measured in packed columns with cocurrent downward flow. The empirical equations of liquid-phase volumetric coefficient are distinctly different in spray, pulse and dispersed bubble flow regions.
The boundaries for the respective flow regions, obtained by combining two of these equations of volumetric coefficient, are in good agreement with the boundaries which have previously been given from the equations of interfacial area in the same fashion.
The foam flow region, which gives the maximum value of liquid-phase mass-transfer coefficient, was found at higher gas Reynolds number in comparison with pulse and dispersed bubble flow regions.
Taking the ratio of packing to column diameter dp/T and surface shape factor of packing Ø into consideration, the empirical equation of mass-transfer coefficient is presented in respective flow regions as
Sh=k*ldp/DA=5×102φ0.3Re1/3lRe1/5gSc1/2(dp/T)2.2
This equation is applicable to illustrating the literature data in pulse and dispersed bubble flow regions.
