Effect of Temperature and Solvent Composition on the Optimum Velocity
The approximate function for the optimum velocity given by equation (43) does not take into account the effect of solvent composition and temperature on solute diffusivity. Consequently a more precise function for the optimum velocity will be employed, (see Book 9)viz.
(50)
Values for (Dm) can be calculated (19), using the following equation,
(51)
where 
|
is the Diffusivity of the solute at temperature (Tx) and solvent composition (cx) |
|
is the Diffusivity of the solute at the reference temperature (To) and solvent composition (co) |
|
is the viscosity of the solvent at temperature (Tx) and solvent composition (cx) |
and 
|
is the viscosity of the solvent at the reference temperature (To) and solvent composition (co) |
