由熱毛細對流所造成非融合現象之數值模擬分析研究

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姓名

阮文宏(Nguyen Van) 查詢紙本館藏

畢業系所

機械工程學系在職專班

論文名稱

由熱毛細對流所造成非融合現象之數值模擬分析研究
(Numerical Computation of Noncoalescence Phenomenon Induced by Thermocapillary Convection)

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摘要(中)

In this thesis, the noncoalescence phenomenon of two silicone oil droplets induced by thermocapillary convection is numerically investigated by the finite element method. The Arbitrary Lagrangian-Eulerian and conservative level set methods are used to trace the moving and deforming droplet/air interface. The noncoalescence is attributed to the existence a self-lubricating air film between two droplets to separate them from coming into contact, which is generated by the thermocapillary convection. The effect of temperature difference, interstitial film thickness between the two droplets, and silicone-oil viscosity on the ability of thermocapillary convection in the coalescent suppression is considered.
The numerical results indicate that the thermocapillary convection affects the deformation of the droplet shape. The ability of thermocapillary convection can be enhanced by the increase of the temperature difference or the reduction of the interstitial film thickness and the decrease of the liquid viscosity. The deformation of droplet/air interfaces might also be enlarged with the stronger thermocapillary convection. Moreover, the air velocity swept by the motion of silicone-oil into the lubricating air film would be higher and hence, the coalescencing suppression is improved.

摘要(英)

關鍵字(中)

關鍵字(英)

★ Thermocapillary convection
★ Noncoalescence

論文目次

Abstract. i
Table of contents. ii
Figure captions. iv
Table captions. vii
Nomenclature. viii
Chapter 1. Introduction. 1
1.1 Overview of noncoalescence phenomenon induced by
thermocapillary convection. 1
1.2 Objective and scope of the thesis. 5
Chapter 2. Physical Problems. 6
2.1 Model description. 6
2.2 Mathematical formulations. 7
2.3 Initial and boundary conditions. 8
Chapter 3. Computational Method. 9
3.1 Numerical methods for tracking interface. 9
3.2 The conservative level set method. 10
3.3 The moving mesh (ALE) method. 12
3.4 Computational tool. 14
3.5 Solving processes. 14
3.6 Convergent test. 16
3.7 The cases for computation. 16
Chapter 4. Results and Discussions. 18
4.1 The effect of temperature differences. 20
4.2 The effect of reducing interstitial film thickness. 23
4.3 The effect of different silicone-oil viscosities. 25
Chapter 5. Conclusion. 27
Chapter 6. References. 28

參考文獻

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指導教授

陳志臣(Jyh-Chen Chen)

審核日期

2010-1-21

推文