Optimization of the Uvp+Pd Rheometric Method for Flow Behavior Monitoring of Industrial Fluid Suspensions
Optimization of the Uvp+Pd Rheometric Method for Flow Behavior Monitoring of Industrial Fluid Suspensions
复制标题
用于工业流体悬浮液流动行为监测的 Uvp Pd 流变测量方法的优化
DOI：
10.3933/applrheol-22-42760
复制
发表时间：
2012
期刊：
影响因子：
1.8
通讯作者：
R. Haldenwang
中科院分区：
文献类型：
--
作者：
R. Kotze;J. Wiklund;R. Haldenwang
摘要 超声波速度分布 (UVP) 是研究和工程应用中速度分布测量的一种强大技术，因为它是唯一可用的方法，具有成本效益、相对容易实施并适用于工业中常见的不透明流体悬浮液。 UVP 还可以与压降 (PD) 测量相结合，以便通过将理论流变模型拟合到单个速度剖面测量来获得非牛顿流体的流变参数。如今，复杂流体的流动特性几乎完全是使用市售仪器获得的，例如传统的旋转流变仪或管（毛细管）粘度计。由于这些方法非常耗时且不适合实时过程监控，因此 UVP+PD 方法成为工业应用中在线流动行为监控和质量控制的非常有吸引力的替代方案。然而，UVP+PD 方法的准确性很大程度上取决于测量的速度剖面的形状和大小，并且当前的仪器和方法仍然存在一些问题，以实现工业应用所需的鲁棒性和准确性。这项研究工作的主要目标是通过实施新的传感器技术和信号处理技术来优化 UVP+PD 系统，以实现更准确的速度剖面测量以及工业/现实条件下复杂流体的流变特性。新方法在两种不同的管道直径（22.5 和 52.8 毫米）中进行了评估，并使用三种不同的非牛顿流体进行了测试，以获得广泛的流变参数。还将结果与传统的旋转流变测定法和管粘度测定法进行了比较。结果发现，与使用传统 UVP 仪器和商业软件（Met-Flow SA 3.0 版）测量的曲线获得的结果相比，从整个管道半径（尤其是靠近速度梯度高的管道壁）的精确速度数据获得的流变参数与传统流变测量法具有更好的一致性。 UVP+PD 方法现在更加稳健和准确。剩下的主要挑战是在工业过程中成功实施完整的非侵入式系统，能够实现非牛顿流体悬浮液的实时、准确的复杂流量监测。
Abstract Ultrasonic Velocity Profiling (UVP) is a powerful technique for velocity profile measurements in research and engineering applications as it is the only available method that is cost-effective, relatively easy to implement and applicable to opaque fluid suspensions, which are frequently found in industry. UVP can also be combined with Pressure Drop (PD) measurements in order to obtain rheological parameters of non-Newtonian fluids by fitting theoretical rheological models to a single velocity profile measurement. The flow properties of complex fluids are almost exclusively obtained today using commercially available instruments, such as conventional rotational rheometers or tube (capillary) viscometers. Since these methods are time-consuming and unsuitable for real-time process monitoring, the UVP+PD methodology becomes a very attractive alternative for in-line flow behavior monitoring as well as quality control in industrial applications. However, the accuracy of the UVP+PD methodology is highly dependent on the shape and magnitude of the measured velocity profiles and there are still a few problems remaining with current instrumentation and methods in order to achieve the robustness and accuracy required in industrial applications. The main objective of this research work was to optimize an UVP+PD system by implementing new transducer technology and signal processing techniques for more accurate velocity profile measurements as well as rheological characterization of complex fluids under industrial/realistic conditions. The new methodology was evaluated in two different pipe diameters (22.5 and 52.8 mm) and tested with three different non-Newtonian fluids in order to obtain a wide range of rheological parameters. Results were also compared to conventional rotational rheometry and tube viscometry. It was found that rheological parameters obtained from accurate velocity data across the pipe radius, especially close to pipe walls where the velocity gradient is high, showed better agreement to conventional rheometry than when compared to results obtained using profiles measured with conventional UVP instrumentation and commercial software (Met-Flow SA Version 3.0). The UVP+PD method is now more robust and accurate. The main challenge remaining is to successfully implement a complete non-invasive system in industrial processes that is able to achieve real-time and accurate complex flow monitoring of non-Newtonian fluid suspensions.