Characteristics of Fluid Flow and Thermal Fields in a Confined Turbulent Air Jet Impinging on a Heated Solid Block. | ||
| ERJ. Engineering Research Journal | ||
| Articles in Press, Accepted Manuscript, Available Online from 31 October 2025 | ||
| Document Type: Original Article | ||
| DOI: 10.21608/erjm.2025.430695.1435 | ||
| Authors | ||
| Ashour A. khatab* ; Essam M. Wahba; Abdel Fattah M. Mahrous | ||
| Department of Power Mechanical Engineering, Faculty of Engineering, Sheben Elkoom, Menoufiam, Egypt | ||
| Abstract | ||
| Jet impingement plays a vital role in numerous engineering applications, including the cooling of rocket launchers, gas turbine blades, and combustor chamber walls. This study investigates the fluid flow and heat transfer characteristics of a three-dimensional turbulent jet impinging on a heated solid block using both numerical simulations and experimental measurements. A perpendicular jet was directed onto a hot solid block positioned at the bottom wall of a rectangular duct. The realizable k–ε turbulence model was employed for all simulations as it provides superior predictive accuracy compared to alternative models. The effects of Reynolds number, solid block temperature, and aspect ratio were systematically examined. Results reveal the formation of multiple recirculation zones induced by the jet impingement: a primary zone near the upper wall, a secondary zone above the block, and another behind the block step. The stagnation point exhibited maximum pressure, which increased with Reynolds number, while the negative pressure region downstream expanded, leading to a longer reattachment length. Temperature distributions indicated higher local temperatures and steeper gradients at lower Reynolds numbers and elevated block temperatures, enhancing heat transfer to the fluid. The experimentally determined average Nusselt number increased with increasing Reynolds number and solid block temperature. Analysis of velocity profiles showed that larger solid block aspect ratios elevated fluid flow kinetic energy and intensified secondary flow structures. Overall, the block geometry significantly influenced the formation and strength of recirculation zones, thereby affecting thermal and flow performance. | ||
| Keywords | ||
| Turbulent flow; Impinging jet; CFD simulation; Heat transfer enhancement; Secondary flow | ||
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