本文探討圓柱容器內潛流場之煙線，邊界上來回擺盪之二葉片驅使流體運動，流場受三參數控制，分別為二葉片長度與其週期比值。研究指出：短週期葉片旋轉有助於煙線充分獲得延展、彎曲與摺疊，長週期葉片則遲滯延展，另改變短週期葉片長度將大幅影響煙線形狀。

This study addresses the creeping flow of streaklines that occur in cylindrical containers. Two blades installed along the boundary are oscillated to drive the fluid. Flow fields are determined by three parameters, including the blade lengths and period ratios. This investigation indicates that a rotating blade with a shorter period produces streaklines with significant stretching, bending, and folding, whereas blades with longer periods reduce these phenomena. The streaklines are varied significantly by changing the blade lengths with a shorter period.