Abstract: An investigation of the selected geometry for Compact Inline Contactor (CIC) has been carried out to study the effect of geometry on the pressure drop and mass transfer rate. Ejector type geometry has been selected and two-dimensional (2D) surface has been created for gas-liquid study using CFD approach. Operating condition is maintained by using constant value for inlet pressure and flow-rate for both gas and liquid. The length of diameter ratio of mixing tube (Lm/Dm) was varied from 5, 6 and 7. At Lm/Dm = 7, pressure recovery is found to be faster than other Lm/Dm ratios. However, at Lm/Dm = 5, mass transfer rate profiles is better than others.