本論文的主要目的為以電腦模擬來討論膠體粒子在多重楔行管收集器中在不同的作用力曲線下，對具有布朗運動的膠體粒子進行多層吸附時，遮蔽效應對其吸附效率的影響。在基本理論的建立上，本論文選擇以楔型管流場模式來描述收集器周圍的流場分佈，並以機率統計來處理布朗運動的現象。關於膠體粒子與收集器表面間的內部作用力，如凡得瓦爾吸引力與電荷排斥力，本論文根據DLVO理論來討論。 模擬的結果發現，DLVO作用力、流速以及布朗運動對於膠體粒子在多重PCT收集器中的 吸附效率的影響較為明顯，相較之下對於多重SCT收集器中就沒那麼顯著，主要原因是膠體粒子吸附位置的不同。在多重PCT收集器中，膠體粒子會吸附在收集器較前端的位置，因此不易有堵塞的情況產生，但是在多重SCT收集器中，膠體粒子會吸附在較中端的位置，容易產生堵塞的情形。在後端收集器的吸附效率，可以明顯發現，受到前端收集器的吸附效率影響，遠大於其他作用力。本論文的最後，我們將電腦模擬值和文獻上已有的實驗結果作一比較。 The deposition morphology of particles onto the wall surfaces of multi-connected constricted tubes is investigated by applying the Brownian dynamics simulation method in the present thesis. The effect of various types of the total interaction energy curves of DLVO theory, and of the shadow area cast by those deposited particles, on the particles' collection efficiencies are examined. Applying with the concept of the control window where the approaching particles originate singularly and randomly, the present simulation method successfully describes the amount of particles deposited as well as the morphology of the deposits in a detailed step-by-step manner by tracking the trajectories of individual particles as they move toward the tube wall. The simulation results show that the collection efficiency is always more affected by the front part collection of the PCT tube. As the deposition location moves closer to the middle region of the SCT tube, the dendrites formed by those non-Brownian particles contain more particles and get easier to plug the throat of the tube than those Brownian particles. The simulation results also fit well with the available experimental data.
