Influence of Impinging Jet Nozzle Movement on Heat Transfer Characteristics of a Flat Plate

Abstract

The purpose of the current experimental study is to assess the influence of impinging air jet movement on the heat transfer of a fixed flat plate. The experiments are conducted with varying the nozzle velocity (Vn) from 400 to 1000 mm/min, and the Reynolds number (Re) from 8000 to 20,000 at a nozzle-to-plate distance (H/D) of 2 and 6. A comparison between a movable nozzle and a fixed nozzle based on the temperature contours and local Nusselt number is presented. Additionally, the local Nusselt number, heat transfer uniformity index, and uniformity of heat transfer are evaluated. The results demonstrate that the local Nusselt number of 24.8 has a maximum value at a Vn of 400 mm/min, a Re of 20,000, and a H/D of 2. The uniformity of heat transfer is enhanced by increasing the Vn, and its maximum value of 89.5% is maintained at a Vn of 1000 mm/min, Re of 20,000, and H/D of 6. Additionally, the heat transfer uniformity index decreases with increasing the Vn where its maximum value is 0.34 at a Vn of 400 mm/min, a Re of 8000, and a H/D of 2.