Development of ultrasonic visualizer for capturing the characteristics of viscoelastic fluids
Development of ultrasonic visualizer for capturing the characteristics of viscoelastic fluids
复制标题
开发用于捕捉粘弹性流体特性的超声波观察仪
DOI：
10.1007/s12650-013-0182-1
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发表时间：
2013
影响因子：
1.7
通讯作者：
Y. Takeda
中科院分区：
文献类型：
--
作者：
T. Shiratori;Y. Tasaka;Y. Murai;Y. Takeda
在流变学领域，非牛顿流体的性质传统上是用粘度曲线等图形来表示的。在本文中，我们提出了一种可视化工具，将流体性质表示为旋转圆柱体中的可视化流体运动。为了突出不同的流体运动，给出了三种旋转模式：快速开始恒定旋转（向上旋转），快速停止恒定旋转（向下旋转）和周期性旋转。通过比较硅油、酸奶和聚丙烯酰胺（PAA）溶液三种流体的速度分布，讨论了流体运动与流体性质之间的关系。利用超声测速仪（UVP）获得时空测速图。速度图反映了基本的流变特性，如剪切变薄、屈服应力和弹性。提出了两种额外的显示模式来探索由于PAA溶液和酸奶的粘弹性引起的流体运动：网格变形场和剪切速率场。这两种可视化可以直观地理解粘弹性，因为变形和剪切速率分别决定弹性和粘性应力。在自旋沉降试验中，可以清楚地观察到变形网格的弹性恢复。此外，剪切速率分布表明，在侧壁停止旋转后，流体的动能在侧壁附近消散。简而言之，这两个量场可视化了动能、弹性和热能之间的能量转换；这种能量转换是粘弹性流体的特征。图形抽象
AbstractIn the field of rheology, properties of non-Newtonian fluids have been traditionally represented on graphs such as viscosity curves. In this paper, we propose a visualizer to express the fluid properties as visualized fluid motions in a rotating cylinder. To highlight different fluid motions, three patterns of rotation were given to the cylinder: rapid start of constant rotation (spin-up), rapid stop from constant rotation (spin-down), and periodic rotation. Relationships between fluid motion and fluid properties are discussed by comparing velocity profiles for three fluids: silicone oil, yogurt, and a polyacrylamide (PAA) solution. Ultrasonic velocity profiler (UVP) was used to obtain spatio-temporal velocity maps. The velocity maps reflect essential rheological properties, such as shear thinning, yield stress, and elasticity. Two additional display modes are proposed to explore fluid motions due to viscoelasticity of the PAA solution and yogurt: a grid deformation field and a shear rate field. These two visualizations can provide intuitive understanding of viscoelasticity because deformation and shear rate determine elastic and viscous stresses, respectively. In spin-down tests, the recovery of deformed grids, which is caused by elasticity, can be explicitly observed. Further, the shear rate distributions indicate that kinetic energy of the fluid dissipates near the lateral wall right after the wall stops rotating. In short, these two quantity fields visualize energy conversion among kinetic, elastic, and thermal energy; such energy conversions are characteristic of viscoelastic fluids.Graphical Abstract
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