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<p>This work investigates the thermohydraulic performance of a solar air heater equipped with a novel roughness geometry referred to as a serrated-circular rib. To the best of the authors’ knowledge, this hybrid configuration, combining circular rib structures with serrated features, has not been extensively investigated in the existing literature. Most previous studies have focused on conventional rib geometries, in the form of circular, V-type or arc ribs, which often increase friction without giving a proportional gain in heat transfer. Twelve variations of the new rib shape were tested numerically in a two-dimensional domain for Reynolds numbers between 3800 and 18,000. The relative roughness height <i>e</i>/<i>D</i> was changed from 0.021 to 0.06, while the pitch ratio <i>P</i>/<i>e</i> remained fixed at 14.29. Among all configurations, the one with <i>e</i>/<i>D</i> = 0.06 (Case <i>α</i>3) showed the best thermal enhancement ratio, reaching 1.825. This improvement is mainly due to stronger turbulence, larger recirculation zones and better mixing in the vicinity of the ribs. The results confirm that the serrated-circular shape provides a clear performance advantage compared with the rib geometries usually reported in the literature. It also offers a practical direction for improving the efficiency of future solar air heater designs.</p>

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Numerical Investigation of Heat Transfer and Flow Characteristics in a Solar Air Heater with Serrated Circular Ribs under Turbulent Regime

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Mouad Benaicha,
  • Youssef Es-Sabry,
  • Elmiloud Chaabelasri

摘要

This work investigates the thermohydraulic performance of a solar air heater equipped with a novel roughness geometry referred to as a serrated-circular rib. To the best of the authors’ knowledge, this hybrid configuration, combining circular rib structures with serrated features, has not been extensively investigated in the existing literature. Most previous studies have focused on conventional rib geometries, in the form of circular, V-type or arc ribs, which often increase friction without giving a proportional gain in heat transfer. Twelve variations of the new rib shape were tested numerically in a two-dimensional domain for Reynolds numbers between 3800 and 18,000. The relative roughness height e/D was changed from 0.021 to 0.06, while the pitch ratio P/e remained fixed at 14.29. Among all configurations, the one with e/D = 0.06 (Case α3) showed the best thermal enhancement ratio, reaching 1.825. This improvement is mainly due to stronger turbulence, larger recirculation zones and better mixing in the vicinity of the ribs. The results confirm that the serrated-circular shape provides a clear performance advantage compared with the rib geometries usually reported in the literature. It also offers a practical direction for improving the efficiency of future solar air heater designs.