Controlled Dispersion in the Mobile Phase

Dispersion in the mobile phase is again diffusion controlled and, so, again reiterating equation (7), 

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Equation (21) applies to all types of columns each requiring a different constant (wm) This constant is partly determined by the geometry of the distribution system 

The development of the function describing (tm) for a capillary column is similar to that for the packed column but (r), the column radius, replaces (dp), the particle diameter. 

Due to the varying physical nature of the different packings, it appears that no one has developed a specific function for (com) for a packed column, but it was suggested 

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