The present article is focused on the numerical simulation of the single-phase flow and heat transfer performance by employing geometrical modification of parallel plates, aimed at improving the performance of plate heat exchangers The commercial computational fluid dynamics program ANSYS is used for present investigations. The flow and heat transfer characteristics are obtained for the geometrical changes in the plate heat exchangers by placing the plates at an angle instead of parallel. In the investigation, the four geometries such as converging tapered channel, diverging tapered channel and asymmetrically converging tapered channel are modeled and investigated. It is observed that converging tapered channels have better heat transfer coefficient values as compared to others. The upsurge in the heat transfer coefficient is observed to be higher for higher mass flow conditions.