Numerical and Experimental Comparative Study on the Impact of Jet Diffuser Geometry on Enhancing Heating of Cubic Components under Varying Crossflow Conditions and Jet Flow

This study focuses on the use of numerical simulations and experimental investigations to analyze how modifications in jet diffuser geometry affect the heating of cubic components exposed to crossflow at different Reynolds numbers and constant-speed impinging jets. The diffuser configurations analyzed include circular, lobed, and swirling designs. The numerical model was validated against experimental data. The results show that as the crossflow Reynolds number increases, the cube temperature and average Nusselt number decrease significantly, especially at higher values. In the absence of crossflow (ReH = ۰), a region of influence forms on the cube due to the impinging jet, with noticeable differences in heat transfer among the diffuser configurations. The lobed and circular designs demonstrated slight improvements in heat transfer efficiency. As the Reynolds number increases, the lobed diffuser provides superior heat distribution, offering a broader heating area and more uniform temperature across the cube. For ReH = ۲۵۰۶, the lobed and circular jets improved heat transfer by ۱۹.۱۳% and ۱۴.۶۹%, respectively, while for ReH = ۷۵۱۸, improvements of ۱۶.۲۹% and ۲۵.۷۰% were observed. Finally, at ReH = ۱۰۰۲۴, the lobed and circular diffusers achieved superior heating performance, with increases of ۱۳.۹۵% and ۳۵.۳۱%, respectively. Overall, the lobed diffuser emerged as the most effective configuration for heating cubic components across various crossflow Reynolds numbers. Therefore, jet geometry is a critical factor to consider when designing and optimizing jet systems to ensure uniform heating and optimal performance.

کلیدواژه ها:

Heating components ، Circular jet ، Swirling jet ، Impinging jet ، Lobed jet