查詢結果分析
來源資料
頁籤選單縮合
題 名 | 二次黏彈性流體在後向階梯流場之流動現象 |
---|---|
作 者 | 許政行; 周子堯; | 書刊名 | 中原學報 |
卷 期 | 22 1993.12[民82.12] |
頁 次 | 頁68-79 |
分類號 | 440.137 |
關鍵詞 | 二次黏彈性流體; 再附著長度過激; 後向階梯; Second grade viscoelastic fluid; Reattachment lengths overshoot; Back ward facing step; |
語 文 | 中文(Chinese);中文(Chinese) |
中文摘要 | 本文研究分析有關二次黏彈性流體在後向階梯流場之流動現象。經由比較不同的彈性係數及雷諾數在後向階梯流場之流動現象,以了解不同的彈性係數在流場中的影響。 本研究對二次黏彈性流體在後向階梯流場之流動現象的分析,主要採數值的模擬分析方式。數值模擬分析,本體是將有限差分法應用在渦度及流線方程式上相關的數值分析方法有高斯-賽德法(Gauss-SeidelMethod)配合鬆弛法(Relaxation Method)及交互掃描法。最後比較在向雷諾數下不同的彈性係數對流場的影響,及相間的彈性係數下不同的雷諾數對流場的影響。最後發現雷諾數等於50、彈性係數等於0.001;雷諾數等於75、彈性係數等於0.001;及雷諾數等於75、彈性係數等於0.0005時,再附著長度有過激(Overshoot)的現象產生,此現象是在牛頓流體中所未發現過的。另外當雷諾數等於75、彈性係數等於0.001時,流場有穩態次迴流區存在,而此現象在牛頓流體中,只有當雷諾數超過400才發現過。 |
英文摘要 | The flow phenomenon of the second grade viscoelastic fluid in the backward facing step flow were analyzed in the present study. The effects to the flow of the fluid in the backward facing step flow were examined under different Reynolds numbers and viscoelastic coeffcients. The flow fields were studied by numerical computational. The fìnite difference method was used on the vorticity function and strearn function equations. The Gauss-Seidel methoQ with successive over relaxation is implemented to the finite difference method to obtain the solutions. The results indicated the reattachment Iengths has overshoot phenomenon when Reynolds number is 50, viscoelastic coefficient is 0.001; Reynolds number is 75, viscoelastic coeffcient is 0.001 and 0.0005. This phenomenon has never been found in the newtonian fluid. In addition, the secondary recirculation zone can exist at steady state when Reynolds number is 75, and viscoelastic coefficient is 0.001. The similar resuIts can only be found in newtonian fluid when Reynolds numbers excess 400. |
本系統中英文摘要資訊取自各篇刊載內容。