| 研究生: |
葉文義 Yeh, Wen-Yih |
|---|---|
| 論文名稱: |
化學反應與磁場影響下微極流體通過
波形渠道之暫態混合對流熱質傳之研究 Transient Convection Heat and Mass Transfer of Micropolar Fluid Flow through a Wavy Channel Including Magnetic Field and Chemical Reaction Effects |
| 指導教授: |
陳朝光
Chen, Chao-Kuang |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 120 |
| 中文關鍵詞: | 微極流體 、波形渠道 、化學反應 、三次樣線交換方向定置 、熱質傳率 |
| 外文關鍵詞: | chemical reaction, heat and mass transfer rate, wavy surface channel, cubic spline |
| 相關次數: | 點閱:109 下載:1 |
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本論文為分析微極流體在磁場及化學反應下通過波形渠道的熱質傳現象。微極流體是採用Eringen所推導的理論,化學反應則是以Anjalidevi所使用的化學反應參數,而統御方程式是以完整的Navier-Stokes方程式推導完成,無因次化後再對波形表面做座標轉換,數值方法則是以三次樣線交換方向定置法( SADI )來求其數值解。
分析結果顯示,雷諾數對於在波形渠道中的熱質傳依然有很大的影響力,雖然微極流體的渦漩黏度、旋轉梯度黏度及微慣量使得渦漩度下降,但由於微極流體有較牛頓流體為高的黏滯性,因此會增加阻力及降低熱質傳。波形表面會使得表面積增加進而提高熱質傳率,但也會使迴流區擴大進而降低此區的效率,也就是俗稱的”死水區”,但加入磁場效應之後會使得渠道中心流速變慢,接近壁面的流速加快,熱質傳率便會大增,但所付出的代價就是要增加驅動力。因溫度差及濃度差產生的浮力效應會使流速加快,摩擦係數、Nusselt數、Sherwood數也都會上升,迴流區則會變小甚至消失。化學反應在混合對流時,比較不會有使濃度逆傳遞的現象產生,且只會對質傳效果產生比較大的影響。
The micropolar fluids pass through a wavy-wall channel whit magnetic field effect and chemical reaction has been analyzed. We used the theory of micropolar fluid that derived by Erigen and took the chemical parameter that used by Anjalidev. The governing equations of system are derived from complete Navier-Stokes equations with theories of micropolar fluid and chemical reaction parameter. After dimensionless, we used a coordinate transformation method to expand the irregular boundary into a calculable regular and spline alternating- direction implicit (SADI) method to solve the equation.
Numerical results show that, heat and mass transfer rate will increase when rise the Reynolds number. In micropolar fluid, though, the characteristics of effects of vortex viscosity, spin-gradient viscosity and micro-inertia density will increase the vorticity, the drag force and transfer rate will get rise and down respectively because of that micropolar fluids has higher viscosity than Newtonian fluid. Use the model of wavy channel will increase the quantity of heat transfer area but it will arise the area of vortex called “dead water”. Including the magnetic field effect can decrease the velocity in the middle of the channel and increase near the wavy surface, and the heat transfer rate will get better. Furthermore, it should be noted that adding in heat transfer rate usually implies the increase in skin-friction coefficient. This would make a penalty in pumping power required for wavy channels. When including the buoyancy force effects cause by temperature and concentration difference will add the velocity and then raise the skin-friction coefficient, Nusselt number and Sherwood number. Chemical reaction is just effect upon the mass transfer rate in mixed convection.
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