Jet Impingement Heat Transfer on Heated Block by Using Different Nozzle Arrangements

The current paper presents to study effect of consuming a direct slot jet inside a square channel to increase the heat transfer convection in a channel prepared with a heated block and slot jet with different nozzle arrangements. In numerical solution, to construct a two-dimensional domain for simulation, the SOLIDWORKS 2018 software was used, and the numerical tool (ANSYS Fluent Workbench 2020 R2) is employed. The study included the effects of the following parameters such as slot Nozzle opening d = 3, 4, and 5 mm, slot Nozzle distance to opening ratio x/d = 2, 4 and 8, slot Nozzle velocity vj = 1, 2, 4 m/s, Heat flux q′′ = 1000 W/m2, Duct inlet velocity u = 1 m/s, slot Nozzle hit h = 3.5 cm and slot nozzle types flat, converge, diverges. The present numerical study uses a computational domain of a square duct with a length of 90 cm and a side dimension of 20 cm, which is used for air passage. The main airflow from the surroundings entered the channel inlet to achieve a fully developed flow is about 42.5 cm. The results showed that using the convergent nozzle, which increased in Nu by 73% compared to that of the divergent nozzle, and the enhancement of Nu is 77% associated with that of the flat nozzle when using the convergent Nozzle at xj = 6 mm and dj = 3 mm.