One of the most commonly used electronic cooling methods is jet impingement. The aim of this project is to come up with effective way to improve heat transfer for the transient flow impinging jet. The kω SST turbulent model is used with the ANSYS Fluent 2019R3 solver. To make design improvements, the impingement domain is introduced and validated. The addition of various ring shapes improves heat transfer. Totally four ring shapes has been studied in this study namely, rectangular, round edged rectangular, semicircular ring, and semi-elliptical rings. With the experimental literature, the impinging jet domain is validated with a 2.13% deviation of the average Nusselt number. The increase in average Nusselt number for rectangular, round edged rectangular, semi-circular ring, and semi-elliptical rings considered in this analysis was found to be 47.92%, 33.77%, 51.65%, and 44.50%, respectively. As a result, the ring on the target surface improves the efficiency of electronic cooling through transient flow impinging jets significantly. The effect of location of ring on the target surface also studied and reported.