Flow Programming with a Compressible Mobile Phase

Flow Programming with a Compressible Mobile Phase [Pg.146]

Flow programming with a compressible mobile phase is a far more complicated process to examine theoretically. We shall assume that, under flow programming conditions, the mass flow rate will be increased linearly with time, i.e. (Qo(t)) = (Q o + otQt) where (Q o) is the initial exit flow rate, (Qo(t)) is the exit flow rate after time (t) and (aq) is the flow program rate. [Pg.146]

These conditions are usual for modern gas flow programming devices that utilize mass flow controllers which are often computer operated. Now, if (AV(o)) is an [Pg.146]

Now as the flow is increased, the inlet pressure will also increase and, thus, the inlet/outlet pressure ratio (y) will change progressively during the program. [Pg.146]

Consequently, as the inlet pressure increases, the mean flow rate will be reduced according to the pressure correction function and the expected decrease in elution rate will not be realized. Consider an open tubular column. [Pg.146]

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