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題名 | 動脈血管狹窄處穩態與脈動血液流場之模擬研究=Numerical Simulation of Steady and Pulsatile Blood Flow Through an Idealized Stenosis |
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作者姓名(中文) | 邱澄彬; 胡正華; 郭英勝; 王貞仁; | 書刊名 | 力學 |
卷期 | 13:1 1997.03[民86.03] |
頁次 | 頁73-85 |
分類號 | 415.384 |
關鍵詞 | 動脈血流; 壁面剪應力; 微極流體; 有限差分法; Arterial flows; Wall shear rate; Micropolar fluids; Finite difference method; |
語文 | 中文(Chinese) |
中文摘要 | 本文係以有限差分法模擬血液流經動脈血管狹窄處之流場特性,使用流體理論的 基礎係以 Eringen 推導之微極流體理論為主,數值計算採用 SOR 與 ADI 計算方法, 並應 用代數格點產生法配合均勻格點,探討穩態與脈動流場,在不同動脈血管狹窄處之截面積與 動脈血管之截面積比的流場特性,及不同微旋度之壁面邊界參數對流場的影響。並比較改變 血管直徑與速度後,微極流體與牛頓流體間的差異。 由模擬結果得知:本文推導的數值解題程序,可成功應用於預測血液流經動脈血管狹窄處的 流場現象;在相同血管直徑與雷諾數下所獲得最大壁面剪應力與狹窄處之喉部速度和前人比 較, 得相似的結果:在微旋度之壁面邊界參數接近 1 的情況下,牛頓流體的壁面剪應力與 迴流區均比微極流體大,但狹窄處旳速度卻比微極流體小;微旋度之壁面邊界參數愈小,壁 面剪應力愈大,但迴流區與喉部速度變化不大。脈動流場最大壁面剪應力之脈動模式與入口 脈動模式相同。 |
英文摘要 | The characters of blood flow through an arterial stenosis have been simulated by using finite difference method in the present study. The fluid theory is based on the theory of micropolar fluids introduced by Eringen. Successive over relaxation ( SOR ) and alternating direction implicit ( ADI ) methods are applied to a uniform grid system generated algebraically. The characters of steady and pulsatile flow in different ratio of artery stenosis and artery vessel cross-sectional area, microspin and fluid vorticity on the wall, have been analyzed. The difference in fluid characters between Newtonian and Micropolar fluids by changing vessel diameter and inlet velocity also has been compared. The results of the simulations are as follows: 1.The numerical computing procedure in this study successfully predicts the phenomenon of blood flow through an artery stenosis. 2.The maximum wall shear stress and stenosis throat velocities were compared with those of previous work in the same diameter and Reynold's number, and found to agree favorably. 3.When the ratio of microspin and fluid vorticity approaches 1 on the wall, the Newtonian wall shear stresses and reirculation region are larger than the Micropolar model, but the stenosis veloities are smaller. The smaller the ratio, the larger the wall shear stresses. However, the stenosis velocities in the recirculation region are less affected. 4.The peak shear stresses in the narrowest region obtained from the dynamic patterns of pulsative flow are not much different wiht the steady flow results. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。