A CORRELATION FOR ESTIMATION OF MASS-TRANSFER RATES OF SOLIDS IN GAS-STIRRED LADLE SYSTEMS

Mass transfer between solid and liquid in gas stirred cylindrical vess els has been analysed both theoretically and experimentally. To this e nd, starting from an appropriate ''single particle-fluid correlation'' , a relationship applicable to a system of suspended solids has been d educed and represented according to: Sh(av)=1.1 (epsilon(m) d(p)(4)/v( 3))(0.19)(Sc)(0.33). On the basis of this, dissolution of solids in tw o different aqueous models of gas stirred ladies has been investigated and it has been demonstrated that the correlation produces estimates which are in reasonable agreement with the experimental observations. Furthermore, it is shown that the present correlation has a form analo gous to the one, derived much earlier by Kolmogoroff from the theory o f isotropic turbulence.