In the present study, a 3D volume of fluid (VOF)-based computational fluid dynamics (CFD) model was developed and analyzed through numerical analysis of two immiscible liquids, water and kerosene. The geometry of the microchannel is selected as Y-type and T-type in a square cross - section for a liquid–liquid flow process. A parametric study of microchannels was conducted by increasing the flow rate ratio. It was observed that the flow behaviour included stratified flow, wave flow, and churn flow in different channel geometries. When the flow rate ratios were increasing, the pressure drop increased across the length of the channel. It was observed that the average volume fraction of the aqueous solution increase with increased flow rate ratios in 45° and 60° inlet Y-type microchannels. The shear stress analysis of Y-type and T-type microchannels shows that increasing the flow rate ratio increased the shear stress in all three types of microchannels.