摘要
为了探究气泡在黏性流体中的运动变化从而进一步研究起泡脱挥机理,采用高速摄影法测定了气泡在静置流体中的上升运动行为及其形变特性,考察气泡在上升运动过程中脱离时间、等效脱离直径、瞬时速度及纵横比等参数的变化,并分析气泡在不同进气流量下的运动轨迹及聚结、分离过程。研究表明:在黏性流体中气泡的运动轨迹趋于直线型上升,相较于水中的“S”型上升轨迹更加稳定;在高流量下气泡在水中呈现双气泡、三气泡聚集态,而在黏性流体中进气流量达到0.6L/min时气泡才出现聚结现象。随着进气流量增加,气泡脱离时间减小,脱离孔口时直径增大,同时瞬时速度增加。通过观察气泡上升运动行为能够为起泡脱挥理论分析提供一定的实验基础。
In order to explore the motion changes of bubbles in the viscous fluid and further study the foam-devolatilization mechanism,the author used high-speed photography to determine the upward motion and deformation characteristics of bubbles in static fluids.Changes in parameters such as the detachment time,equivalent detachment diameter,instantaneous velocity and aspect ratio of bubbles during the upward motion were investigated,and the motion trajectory,aggregation and separation processes of bubbles under different air inflows were analyzed.Our study indicates that the bubbles tend to rise perpendicularly in viscous fluids,which is more stable than the“S”-shaped upward trajectory in water.At higher flow rates,bubbles show double-bubble and tripe-bubble aggregation states in water.The bubbles don’t aggregate unless the air inflow in viscous fluids reaches 0.6L/min.With the increase of inflow rate,the bubble detachment time decreases,the diameter increases and the instantaneous velocity increases,when it is detached from the aperture.A certain experimental basis can be provided for theoretical analysis of foam-devolatilization,through the observation of the upward motion of bubbles.
作者
周宸
林文博
王勇军
张先明
陈世昌
陈文兴
ZHOU Chen;LIN Wenbo;WANG Yongjun;ZHANG Xianming;CHEN Shichang;CHEN Wenxing(National Engineering Lab for Textile Fiber Materials and Processing Technology,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2021年第6期780-785,共6页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(51803187)。
关键词
黏性流体
高速摄影法
气泡
运动行为
聚结
viscous fluid
high-speed photography
bubble
motion behavior
coalescenc
