(481e) Context of Jacques L. Zakin’s Contributions to our Understanding of Drag Reduction

Professor Jacques L. Zakin conducted research in the field of turbulent drag reduction using polymers, fibers, and surfactants for over 50 years. This presentation will overview turbulent drag reduction research and application from the first experimental observation by Forrest in 1931 to present. Throughout the presentation key research contributions by Professor Zakin will be highlighted. Prof. Zakin’s first 25 years of research focused on polymer and fiber additives as drag reducing agents, including the effect of molecular weight and polymer degradation on drag reduction. His last 25 years of research focused on surfactant additives, emphasizing the effect of chemical structures of cationic, nonionic, and zwitterionic surfactant additives and their mixtures on drag reducing effectiveness and on the interrelationships among chemical structures, drag reduction effectiveness, surfactant microstructure and rheology.