Double slot jet impingement cooling of a round block

This study aims the investigation the effect of impinging of two slot jets on a round block positioned at various angles and aiming at the center of the block. The cumulative effect of the heat transfer along with the flow contours of double jets were studied numerically. RANS approximation is used for the discretized governing equations and the study considered Reynolds numbers of 6000 & 20000 which was defined on the diameter of the round block. The non-dimensional nozzle to block spacing (H/S) of 2 & 8 was analyzed. The fluid is considered as turbulent incompressible two-dimensional flow. The angular placing of the both jets were varied from ϕ=45o to ϕ=180o. For the present numerical study. As a methodology, heat transfer data captured using various RANS turbulence prediction models were analyzed with available experimental data from the previous studies to prescribe the best model. In addition, the investigative understanding of control parameters such as distance from the nozzle to round blocks, Reynolds number, curvature parameter (D/S), and ϕ was discussed in detail. The maximum Nusselt number (NuD) was found to be the highest when slot jets were positioned at exactly opposite locations.