摘要
为了研究粘弹性流体中稳定上升的气泡运动轨迹,主要对稳定上升的气泡在3种不同浓度的粘弹性流体(聚丙烯酰胺-PAA溶液)中运动轨迹进行了实验研究。结果发现气泡的上升轨迹主要分为2种:直线型和螺旋型。气泡运动轨迹变化与气泡的形状及流体的浓度有关,气泡形变越大,轨迹越易由直线型转变为螺旋型。轨迹的不稳定还与溶液的粘弹性剪切变稀流体的流变性质有关,随着溶液浓度的增加,气泡运动轨迹由螺旋形转变为直线型。通过螺径螺距比r/L表示螺旋线的弯曲程度,随着Re的增大,螺径螺距比也越来越大,最终逐渐趋向稳定。
Three kinds of viscoelastic fluid with different concentrations （Polyacrylamide-the PAA solution） were used to analyze the motion trajectory of rising bubbles. It was found that the bubble trajectories in vis- coelastic fluids were mainly divided into two types：straight path and helical path. The trajectory of the bub- ble was related to the shape of bubbles and concentration of the fluid. The greater the deformation of bub- bles, the easier was the change from straight path to spiral path. The rheological property of the fluid with thinned viscoelastic shear also affected trajectory of the bubbles. Increasing the solution concentration would change the bubble trajectory gradually from straight path to spiral path. Screw diameter pitch ratio r/L indi- cated bending degree of the spiral. The r/L value increased progressively with the increase of Re, finally ten- ded to be stable.
出处
《沈阳航空航天大学学报》
2016年第5期88-92,共5页
Journal of Shenyang Aerospace University
基金
国家自然科学基金(项目编号:21406141)
辽宁省博士启动基金(项目编号:20141078)
辽宁省教育厅科学研究一般项目(项目编号:L2014060)
沈阳航空航天大学博士启动基金(项目编号:15YB21)
关键词
粘弹性流体
轨迹
形状
流变性质
viscoelastic fluid
trajectory
shape
rheological property
