本文選題：較大氣泡 + 擴(kuò)散界面法�。� 參考：《原子能科學(xué)技術(shù)》2017年02期

【摘要】：基于擴(kuò)散界面法和有限元法,對(duì)較大氣泡在上升階段的形態(tài)和速度進(jìn)行了模擬,結(jié)果與實(shí)驗(yàn)吻合較好,說(shuō)明該方法能準(zhǔn)確地模擬氣泡的運(yùn)動(dòng)特性。利用該模型,對(duì)初始直徑不同的較大氣泡上升過(guò)程中的形態(tài)、速度和振蕩隨時(shí)間變化的規(guī)律進(jìn)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(guò)程的形態(tài)、速度的變化規(guī)律。結(jié)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(dá)到穩(wěn)定形狀的時(shí)間更長(zhǎng)。氣泡初始直徑越大,氣泡的頂端速度越快,并稍有波動(dòng)。而氣泡的底端速度開(kāi)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(dá)到穩(wěn)定形態(tài)的時(shí)間越長(zhǎng),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(xué)電力學(xué)院廣東省能源高效潔凈利用重點(diǎn)實(shí)驗(yàn)室;
【基金】：廣東省科技項(xiàng)目資助(2014A010106012)
【分類(lèi)號(hào)】：O359.1

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 谷里鵬;最大氣泡壓力法測(cè)定溶液表面張力的改進(jìn)[J];物理實(shí)驗(yàn);1994年03期

，

本文編號(hào)：1840844