【作者】 许晓飞； 刘凤霞； 张菊； 王晓娟； 魏炜； 李志义； 刘志军；

【Author】 Xiaofei Xu;Fengxia Liu;Ju Zhang;Xiaojuan Wang;Wei Wei;Zhiyi Li;Zhijun Liu;Dalian University of Technology;

【机构】 大连理工大学流体与粉体工程研究设计所；

【摘要】 利用高速摄像机对气泡在水中和不同质量分数的羧甲基纤维素(CMC)水溶液中的形变规律和运动特性进行了实验测试。结果表明:在牛顿型流体中,气泡摆动上升,形状呈椭圆形,等效直径相对较小,沿水深方向上升速度振荡。而气泡在非牛顿型流体中基本呈直线上升规律,气泡形状更稳定。随着非牛顿流体表观粘度的增加,气泡由椭圆形逐渐趋近于圆形,上升速度降低。表明非牛顿流体的表观粘度是影响形变规律和运动特性的重要因素。更多还原

【Abstract】 The high speed photography is employed to measure the formation and motion of bubble in water and carboxymethyl cellulose(CMC) solution.The results show that in Newtonian fluid the bubble with ellipse shape is oscillating.Its equivalent diameter is relatively small and the rising velocity along the depth direction oscillates.But the bubble in non-Newtonian fluid is basically rising in line and the bubble shape is stable.With the increase of viscosity of non-Newtonian fluid,the bubble shape gradually tends to be circular,and the rising velocity decreases.It indicates that the apparent viscosity of non-Newtonian fluid is an important factor to affect the formation and motion of bubble in the rising process.更多还原