本文選題：較大氣泡 + 擴散界面法　； 參考：《原子能科學技術》2017年02期

【摘要】：基于擴散界面法和有限元法,對較大氣泡在上升階段的形態(tài)和速度進行了模擬,結果與實驗吻合較好,說明該方法能準確地模擬氣泡的運動特性。利用該模型,對初始直徑不同的較大氣泡上升過程中的形態(tài)、速度和振蕩隨時間變化的規(guī)律進行了分析。并分析了14mm直徑的氣泡在不同尺寸通道中上升過程的形態(tài)、速度的變化規(guī)律。結果表明:氣泡的穩(wěn)定形態(tài)隨著氣泡初始直徑的增大由橢球形變?yōu)榍蛎毙?且達到穩(wěn)定形狀的時間更長。氣泡初始直徑越大,氣泡的頂端速度越快,并稍有波動。而氣泡的底端速度開始快速增大使氣泡向內(nèi)凹陷,隨后回落并在氣泡頂端速度上下振蕩。氣泡上升通道越窄,氣泡達到穩(wěn)定形態(tài)的時間越長,頂端速度越小,氣泡的高寬比越大。
[Abstract]:Based on the diffusion interface method and the finite element method, the shape and velocity of large bubbles in the rising stage are simulated. The results are in good agreement with the experimental results. It shows that this method can accurately simulate the motion characteristics of the bubbles. By using this model, the variation of shape, velocity and oscillation with time during the rising process of large bubbles with different initial diameters are analyzed. The shape and velocity of bubble rising in different size channels with 14mm diameter are analyzed. The results show that the stable shape of the bubble changes from ellipsoid to spherical cap with the increase of the initial diameter of the bubble, and the time of reaching the stable shape is longer. The larger the initial diameter of the bubble, the faster the top velocity of the bubble and slightly fluctuated. The velocity at the bottom of the bubble begins to increase rapidly, causing the bubble to sag inwards, then falls back and oscillates up and down at the top of the bubble. The narrower the bubble rising channel is, the longer the bubble reaches stable shape and the smaller the top velocity is, the larger the aspect ratio of bubble is.
【作者單位】： 華南理工大學電力學院廣東省能源高效潔凈利用重點實驗室;
【基金】：廣東省科技項目資助(2014A010106012)
【分類號】：O359.1

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本文編號：1840844