Back mixing in a reciprocating plate column with stable density gradients

Abstract Axial dispersion coeficients were measured in an aqueous phase flowing downward through a 5.08‐cm‐dia. Karr‐type reciprocating plate column. The steady tracer injection method was used, in which the concentration profile was measured upstream of tracer injection. The tracer solution was a strong (150–170 g/L) solution of sodium chloride, whereby a significant stable density gradient (density decreasing with height) was created in the …