查詢結果分析
來源資料
相關文獻
- 矩形密閉容器內自然對流現象之研究
- 以有限元素法分析半圓域上自然對流
- Natural Convection of Viscoplastic Fluids in a Square Cavity
- Effect of initial Condition on Unsteady Thermosolutal Cavity Convection with Opposed Buoyancy Forces
- Modified Finite Element Solutions for Planar Entry Flow of an Oldroyd-B Fluid
- Torsional Vibration Analysis of a Damped Shaft System
- 汽機葉片之機械力學分析研究
- Theoretical Predictions and Experimental Measurements of Particle Deposition on an Isothermal Vertical Cylinder
- 通勤者在平面道路與捷運路網上之運具與路線選擇
- p-Version Space-Time Least-Squares Finite-Element Method for Shallow-Water Equations
頁籤選單縮合
| 題 名 | 矩形密閉容器內自然對流現象之研究 |
|---|---|
| 作 者 | 廖富進; 鄧治東; | 書刊名 | 筧橋學報 |
| 卷 期 | 1 1994.11[民83.11] |
| 頁 次 | 頁173-186 |
| 分類號 | 440.137 |
| 關鍵詞 | 密閉容器; 自然對流; 有限元素法; Enclosure; Natural convection; Finite element method; FEM; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本文以罰函數有限元素法,探討一對壁面絕熱,另一對壁面有溫差存在,而具有 傾斜角之二維矩形密閉容器內的自然對流現象。本文在不同 Ra 數下,改變密閉容器之置放 傾斜角和長厚比,進行數值測試,以探討其熱傳效應。在計算過程中,採用拉格蘭日矩形雙 二次等參元素,並以葛拉金加權餘量法推導離散方程式,而剛度矩陣等則以高斯﹣李健德積 分法進行數值計算;在求解非線性聯立方程組時,則是以高斯消去法配合牛頓﹣拉夫森法進 行疊代計算,並以帶狀儲存法來儲存切線矩陣,以節省記憶空間。 本文計算結果,以等溫圖、流線函數等位圖、平均紐賽數及高、低溫壁面的局部紐賽數分佈 圖等表示。由結果顯示,最大平均紐賽數的傾斜角度隨不同 Ra 數而變;而長厚比愈大,其 平均紐賽數越低。 |
| 英文摘要 | This study on natural convection in an inclined rectangular enclosure was done numerically by the finite element method. To study for the heat transfer effects, we changed the inclination angles and aspect ratios of the enclosure at various Rayleigh numbers. In the present work, the penalty function finite element method, with 9-node Lagrangian biquadratic isoparametric rectangular elements was adopted. The discretization equation is developed for each element by using the Galerkin weighted residual process, and the stiffness matrix is calculated by Gauss-Legendre quadrature. To solve the set of nonlinear equations simultaneously, we used the Newton-Raphson iterative procedure together with the Gauss elimination method. The tangential matrix is stored by the band-width method to save the memory space. The numerical results were presented by using the iso-thermal profiles, stream function profiles, and the average and local Nusselt numbers. The results reveal that the angle of inclination at which the average Nusselt number reaches its maximum value varies as a function of the Rayleigh number. In addition, the larger the aspect ratio, the lower the average Nusselt number. |
本系統中英文摘要資訊取自各篇刊載內容。