双叶片摆动圆形穴槽潜流场之烟线.PDF

科學與工程技術期刊 第八卷 第二期 民國一○一年 53 Journal of Science and Engineering Technology, Vol. 8, No. 2, pp. 53-62 (2012) 雙葉片擺動圓形穴槽潛流場之煙線 胡宗義 蘭陽技術學院電腦應用工程系 26141 宜蘭縣頭城鎮復興路 79 號 摘 要 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。 關鍵詞 ：圓柱容器，潛流場，煙線，葉片 Streaklines Encountered in a Creeping Circular Cavity Flow with Two Oscillating Blades TZONG-YIH HWU Department of Computer Application Engineering, LanYang Institute of Technology 79, Fu-Shin Rd., Tou Cheng, I-Lan 26141, Taiwan, R.O.C. ABSTRACT 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. Key Words : cylindrical container, creeping flow, st