外場下流體相分離的數值模擬; Numerical Simulation of Phase Separation in Binary Fluids with an External Field

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/7334

Title:	外場下流體相分離的數值模擬;Numerical Simulation of Phase Separation in Binary Fluids with an External Field
Authors:	羅尉彰;Wei-Jhang Luo
Contributors:	物理研究所
Keywords:	外加場;相分離;phase separation;external field
Date:	2004-06-18
Issue Date:	2009-09-22 10:55:34 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	外場下相變的動力學在過去十年中已經被廣泛地研究。在這個研究工作中，我們執行數值模擬來研究在均勻電場下的流體相分離現象。當流體歷經相分離時會變為非均質材料，它的介電常數會隨著區域的濃度改變。因此電場能夠影響系統的圖案形成。在我們的模擬中所用的動力學模型遵循著H模型，並且在Ginzburg-Landau自由能中額外加入一個由電場引發的項。分離的相會被排列形成圖案，在其中界面的法向量都垂直於電場。這個系統初期階段的動力學將透過線性分析與雙淬火過程來研究。 The dynamics of phase transitions with an external field is studied extensively in the last decade. In this work, we perform numerical simulations to study the phase separation in binary fluids with a uniform electric field. The binary fluid is inhomogeneous while it undergoes the phase separation, and its dielectric constant varies with the local composition. Therefore the electric field would affect the pattern formation of the system. The dynamic model in our simulation follows the model H with an additional term in the Ginzburg-Landau free energy, which is induced by the electric field. The separated phases are arranged to form patterns where the normal vector of interfaces is perpendicular to the field. The dynamics of this system in the early stage is investigated through the linear analysis and the biquenching process.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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