The effect of the pulse factors on the longitudinal mixing in a batch pulse column, where the spherical balls are consecutively arrayed along the longitudinal axis, has been studied by a concentration impulse method, both theoretically and experimentally. Na²⁴Cl was used as a tracer and the concentration was measured by measuring the redioactivity.
Fick's second law was applied for the longitudinal mixing of the system and verified by the experiment. The eddy diffusivity was calculated by measuring the slope of the concentration-time-impulse response curve in a particular concentration range.
The results of the present investigation shows that the eddy diffusivity isproportional to the frequency and to 4.2 th power of the amplitude, thus giving a conclusion that the longitudinal mixing is much more affected by the amplitude than the frequency.