The phenomenon of drag reduction by polymeric additives has been known since 1949, when it was first reported by B. A. Toms1. Since then, much research has been done to better understand this phenomenon; however, no universally accepted model has ever been proposed to explain the drag reduction mechanism2. The role of polymer conformation and solvent interaction is known to be extremely important3, but the exact effect is still unknown.
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机译：自1949年B. A. Toms1首次报道以来，就已经知道聚合物添加剂的减阻现象。从那以后，为了更好地理解这种现象，人们进行了许多研究。然而，还没有提出普遍接受的模型来解释减阻机制。已知聚合物构象和溶剂相互作用的作用极为重要3，但确切的作用仍是未知的。
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