فهرست نشریات علمی دسترسی آزاد ایران

This study investigates the thermal–hydraulic performance of wavy channels equipped with transverse ribs, addressing the need for optimized heat transfer solutions in compact heat exchangers, where the combined effects of rib geometry and flow regime remain insufficiently explored. The objective is to evaluate how rib inclination angle, height, and count influence heat transfer enhancement and overall efficiency under both laminar (Re = 500) and turbulent (Re = 5000) flow conditions. Three-dimensional numerical simulations were performed using ANSYS Fluent to analyze heat transfer characteristics, frictional losses, and the performance evaluation criterion (PEC). The results show that transverse ribs significantly enhance heat transfer by promoting flow separation and vortex formation. In laminar flow, Nusselt numbers increased by up to ~50% compared to smooth channels, with optimal PEC values achieved at moderate rib heights (h/H = 0.2–0.4), rib angles of 45°–60°, and low rib counts (N = 1–2). In turbulent flow, heat transfer enhancement was more pronounced (Nusselt numbers ~56–58), although increased friction led to PEC values below unity in most cases. Novel trade-offs were identified that balance thermal performance and efficiency, especially in laminar regimes. These findings contribute valuable design guidelines for the geometric optimization of ribbed wavy channels in different flow regimes.