Comparative analysis of modified jet diffuser geometry for evaluating the impact of rounded edges and chamfered design on cooling efficiency of electronic components in cross flow and impinging jet

Abstract

This article investigates the influence of altering the geometry of a jet diffuser and modifying the top corners of electronic components on cooling effectiveness. Computational simulations using the Shear stress transport turbulence model (k-ω SST) are conducted. The study considers a cross-flow Reynolds number of 3410 and varying impinging jet Reynolds numbers (α = Rej/ReH = 0.5, 1, and 1.5). Results show a clear relationship between flow structure and cooling effectiveness. At α = 0.5, cubes with rounded edges and chamfered corners have lower cool-ing efficiency. At α = 1.0, chamfered cubes demonstrate enhanced cooling efficiency (4.7% increase in average Nusselt number). At α = 1.5, rounded cubes exhibit superior cooling performance (3.7% higher Nusselt number). A lobed diffuser configuration achieves outstanding cooling effectiveness, with a Nusselt number 15% higher than a circular jet. These findings provide insights for improving cooling efficiency in electronic components under cross-flow and impinging jet conditions.

Keywords

• Cooling Electronic Components
• Impinging Jet
• Lobed Jet
• Jet Cross Flow
• Wall-Mounted Cube

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