= (6)

In this equation the fluid properties are density () and viscosity () and the packing properties are the sphericity () and the equivalent diameter (Dp). The flow rate of the fluid is in terms of 3 velocity (V), and to account for the density of the packing material, the Ergun Equation has the void fraction ().

In present study the, it is seen that the pressure drop through the bed are mostly effected on liquid flow rate. However the measured pressure drop predicted by Ergun equation which are shown in equation (6).

Fig. effect of liquid flow rate on pressure drop