Experiments were conducted on laminar flow of non-Newtonian fluid through a packed bed of low column to packing particle diameter
ratio (3.8) to elucidate the wall effect on pressure drop and mass flux. Carboxy methyl cellulose (CMC) at different concentrations was passed through the packed bed and the pressure drop was measured at different CMC concentrations and flow rates. It was found that the pressure drop increases with the increase in CMC flow rate. The pressure drop also increases with the increase in CMC concentration for a given flow rate. The friction factor is plotted against Reynolds number and the data for different CMC concentration are found to be scattered around a line expressed as f D 1:03/Re0:87. The tri-regional model of Cohen and Metzner  predicted correctly the mass flux
in the packed bed at different pressure drop values and CMC concentrations with parameters K0 (related to pore geometry) value of 1.5 and Le/L (related to effective path length) value of 1.2, respectively.