Development of Flow Curve Measuring System for High Viscous Solid Suspension by Making Use of Vacuum Cylinder

利用真空筒开发高粘性固体悬浮液流量曲线测量系统

• 批准号: 07555544
• 负责人: OGAWA Kohei
• 金额: $ 0.51万
• 依托单位: Tokyo Institution of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555544/
• 关键词: flow curve; measuring system; rheology; high viscosity; solid suspension; visco-meter; CWM; サスペンション; 粘度; 撹拌; 固体粒子サスペンション

Though a various measuring method for a relationship between shear stress and shear rate have been proposed and used, there is no establis hed one which can be applied to measure the relationship of high viscous solid suspension. The purpose of this research is to establish a flow curve measuring system for high viscous solid suspensions based on the way of thinking about the flow curve measuring system for human blood by making use of a vacuum cylinder. The newly propose measuring system consists of a head tank which is made of stainless steel for high pressure condition, a test circular pipe with a pair of pressure tap which is made of acrylic resin, an electrical platform scale to measure the weight of solid suspension flowed out and a personal computer to treat all of the data. The test liquid comes out from the head tank which is pressurized at 2 atm to the test circular pipe and is stored in a vessel on the platform scale. The personal computer calculates the flow rate and the pressure loss at each time from the data of weight change of solid suspension with time and of pressure difference change with time. Finally, the flow curve, that is to say, the relationship between shear stress and shear rate is drawn and it is expressed on the CRT.The validity of the measuring system was examined by measuring the flow curve of glycerin and it is made clear that the measuring system has enough reliability from an engineering viewpoint. Additionally, the flow curve of a coal-water-mixture (CWM) was measured by this newly presented measuring system. It was clarified that the flow curve of CWM depended on the place of product of coal ; one CWM showed a characteristics of a Bingham fluid and another one showed a characteristics of a power-law fluid. Finally, it was concluded that the newly flow curve measuring system for a high viscous solid suspension was establis hed and it has enough valid from an engineering viewpoint.

尽管人们提出并使用了各种剪切应力-剪切速率关系的测量方法，但还没有建立一种适用于测量高粘度固体悬浮液剪切应力-剪切速率关系的方法。本研究的目的是在借鉴人体血液流动曲线测量系统的思路基础上，利用真空瓶建立一种高粘度固体悬浮液流动曲线测量系统。新提出的测量系统包括一个用于高压条件下的不锈钢高位槽，一个带有一对测压口的丙烯酸树脂测试圆管，一个用于测量流出的固体悬浮物重量的电子台秤和一个用于处理所有数据的个人计算机。测试液体从压力为2个大气压的高位槽中出来，进入测试循环管，并储存在台秤上的容器中。个人计算机根据固体悬浮物的重量随时间的变化和压差随时间的变化的数据计算每个时间的流量和压力损失。最后，绘制了流动曲线，即剪切应力与剪切速率的关系曲线，并将其显示在CRT上，通过甘油流动曲线的测量验证了测量系统的有效性，表明该测量系统具有足够的工程可靠性。并利用该系统对水煤浆的流动曲线进行了测量。结果表明，水煤浆的流动曲线与煤的产品位置有关，一种水煤浆表现出宾汉流体的特征，另一种水煤浆表现出幂律流体的特征。最后得出结论：建立了一种新的高粘度固体悬浮液流动曲线测量系统，从工程角度看，该系统具有足够的有效性。