2-Dimensional Numerical Study of Multiple Slot Jet Impingement on Flat Surfaces

Abstract

Convectional The results of the numerical simulations carried out in this research is for the modeling of jet impingement cooling systems. To develop a more effective jet impingement cooling system, numerous ways were tested. This thesis investigates the effect of multiple slotted jet impingement where the distance between nozzle’s pitch is manipulated to determine the heat transfer relationship. This research also factors in the investigation of the spacing distance between the nozzle inlets to the impinge flat surface. This research is carried out in ANSYS Fluent for the Computer Fluid and Dynamics software approach. The result of this research is generated and analyses with comparison data from the previous studies that had been conducted and validated. These investigations are required in addition to the current research efforts for future cooling system development in global industries. They are three primary factors that are varied in the experiment such as the nozzle-to-nozzle width (X_n/B = 8, 16, 24), the distance between the nozzle and the flat surface (Z_n/B = 5, 8,16), and the Reynolds number involved in this study is 500, 1000, 2000, 10000, 20000. The heat source or heated plate is about 400k and cooled down by the flow of air jets from the nozzle. The heated plate is then measured after the cooling to find out the heat transfer coefficient. The effect shows the discovery of the relationship of the nozzle-to-nozzle width of the jet impinging on a flat surface. The most noticeable configuration is where the width of the nozzle to nozzle is at X_n/B = 24 and the distance from the nozzle to heated flat plate is at Z_n/B = 5. Moreover, it is also shown that a high Nusselt number is produced by a high Reynolds number and a small distance between the nozzle edges and the impingement surface, implying that the systems will be cooled effectively.