Passive Drag Reduction Technologies

• Published in: ChemBioEng reviews 2023-12, Vol.10 (6), p.1110-1122
• Main Authors: Kouser, Taiba, Zulfiqar, Hina, Misbah, Misbah, Alhems, Luai Muhammad
• Format: Article
• Language: English
• Subjects: Computational fluid dynamics; Epoxy coating; Flow control; Passive drag reduction technologies
• ISSN: 2196-9744; 2196-9744
• DOI: 10.1002/cben.202300044

The developments and involved factors of mature passive drag reduction technologies, i.e., compliant coating, superhydrophobic surfaces, and epoxy coating, are reviewed. Alterations in critical Reynolds number are observed in the presence of passive drag reduction technologies. With the advancement in technology, numerical approaches are introduced to lower the cost and achieve better understanding of physical phenomena such as lowering energy, flow control, designing the surfaces of materials, and so on. Experimental results as well as numerical results are stated. The effects of factors like wetting, contact angle, contact angle hysteresis, roughness, pot life, and coating aging responsible for drag reduction are also briefly presented with numerical and experimental perspective analyses. Passive drag reduction (DR) technologies are induced from hierarchical surfaces found in nature. These technologies are popular for drag force reduction, anti‐fouling, anti‐corrosiveness, and other beneficial industrial characteristics. The factors involved in the working mechanism of passive DR technologies are reviewed which could lead to better understanding of these surfaces and DR methodology.