A Comprehensive Review of Design, Applications, and Heat Transfer Enhancement for Advancements in Vortex Generators

Abstract

This study investigates various vortex generator (VG) types, including louvred plates, corrugated surfaces, bars, blocks, and baffles, focusing on their role in generating transverse vortices. However, recent research has shifted towards wings and winglets that create longitudinal vortices, also known as secondary flows, which significantly enhance heat transfer by inducing large-scale turbulence. Initially, VGs were explored as fluid mixing devices to delay boundary layer separation in adverse pressure gradients. Subsequent research pioneered their use in enhancing heat transfer. This comprehensive literature review examines different shapes of VGs, such as delta winglets, rectangular winglets, punched winglets, and curved winglet generators. It explores their applications in flat plate solar water/air heaters, heat exchangers, and various configurations, including common-flow-up and common-flow-down. The review compares heat transfer enhancement among different types of VGs and includes parametric studies aimed at optimizing heat transfer rates. Additionally, it discusses the applications of VGs in rocket science, aviation technology, turbo machines, and chemical industries. Through this extensive review, the study highlights the advancements and applications of various VG designs in enhancing heat transfer across multiple fields.