2018-01-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/699855摘要：液滴結構與動力學在自然界與許多科學技術為常見關鍵機制，如航太引擎中的噴霧油滴分布與生醫、製藥過程的微流體傳輸及合成，是近幾十年國際間流體研究的重要課題。相同液滴間的撞擊已有不少成果，本計畫針對尚少探討、但應用極廣且於基礎力學有相當重要性與前瞻性的異質液滴碰撞作深入研究，預計結合英方團隊（已提出科技部台英雙邊交流計畫支援互訪，希望藉本計畫提供實質研究經費），配合實驗發展數值計算。先前發現異質、不互混的雙液滴碰撞可造成極特殊的結合現象，相較於互混性液滴的擴散相溶，此類碰撞呈現包覆與相黏的結合方式。如此特異機構亟需進一步分析、以供創新的理論與技術開發。除了異質液滴碰撞實驗的軟硬體架設及數據攫取，我們欲發展前瞻的計算方法，可模擬三相或更多相流體的複雜作用、並可含括不同界面間相異的表面張力。其一為晶格波&#20857;曼方法(LBM)，不同於傳統模擬，它使用介尺度計算，對複雜流場及不同巨觀、微觀尺度物理機制有效率、彈性引入的處理；其二為常見的Volume of Fluid (VOF)方法，目前我們參與一台法雙邊交流計畫，和此領域的權威法國UPMC與CNRS團隊有互訪研討。這些計算方法的嘗試與發展可與實驗對照，以建立理論和實際觀測的關聯，將可更完善地解析主導機制、進一步應用至諸多重要課題。<br> Abstract: The dynamics of droplet collisions plays a key role in many natural phenomena and technological applications. Examples include the formation of rain drops and their interaction with solid and liquid surfaces, ink-jet printing, insecticide spraying, spray painting and coating. There has been considerable research aiming to understand the fundamentals of binary droplet collisions where the drops are identical. However, much less is understood about collisions between drops of different liquids or impact conditions such as velocities and sizes. Our aim is to use powerful experimental and computational approaches in parallel to investigate these collisions. These methods are based on our built experimental framework of drop-on-demand techniques while the numerical simulation will be performed using volume of fluid and lattice Boltzmann methods. We aim to obtain a fundamental understanding linking the impact and material properties of the drops, and their internal flows, to how they rebound or coalesce as they collide. Comprehension of these mechanisms will be applicable readily to technologies of our interests in liquid-fueled aerospace combustors and biomedical processes. The project is proposed to match the MOST-RS International Exchange Scheme which we submitted recently for support of mutual visits between Taiwan (NTU) and UK (University of Oxford) research groups. The project will also match our present exchange program supported by MOST to have mutual visits with French researchers (UPMC/CNRS). These studies shall encourage substantial advancement of our existing research on drop impact dynamics which would involve international collaborative efforts with prestigious institutions.液滴碰撞晶格波&#20857曼方法異質液滴包覆VOFdroplet collisionlattice Boltzmann method (LBM)heterogeneous dropletsencapsulationvolume of fluid (VOF)