Abstract
The problem of dispersion that occurs when a solute-solvent interface is transported by a-laminar stream flowing down a straight horizontal tube is investigated. Concentration profiles over a range of Peclet numbers and tube lengths for cases of a single step change in concentration and a periodically varying concentration are measured by an infrared absorption technique. Allowing for the effects of natural convection, good agreement is obtained with Taylor's analytical solution for a step change in gas concentration and Philip's analytical solution for a periodically varying change in gas concentration. Calculations for typical combustion gas sampling probes are presented. It is concluded that dispersion can be best minimized by reducing probe length and diameter.
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