Measuring Lagrangian accelerations using an instrumented particle
Measuring Lagrangian accelerations using an instrumented particle
复制标题
使用仪器化粒子测量拉格朗日加速度
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
J. Pinton
中科院分区：
文献类型：
--
作者：
R. Zimmermann;L. Fiabane;Y. Gasteuil;R. Volk;J. Pinton
测量和表征流动对所采用的测量技术施加了许多约束;特别是，光学方法需要透明的流体和容器中的窗口。尽管人们可以使实验室中的设备、流体和方法适应这些限制，但这对于工业混合器几乎是不可能的。在本文中，我们提出了一种新的测量技术，这是适合于不透明或颗粒流：考虑一个仪表化的颗粒，它不断地传输的力/加速度作用在它身上，因为它是平流在流。其密度可针对各种流体进行调节，并且由于其体积小和无线数据传输，该系统可用于工业和科学混合器，从而更好地了解内部流动。我们证明了粒子的能力和精度，通过比较其传输的加速度，以替代测量，特别是在湍流冯卡门流的情况下。事实证明，我们的技术是一种描述流动特征的高效、快速的工具。
Accessing and characterizing a flow imposes a number of constraints on the employed measurement techniques; in particular, optical methods require transparent fluids and windows in the vessel. Whereas one can adapt the apparatus, fluid and methods in the laboratory to these constraints, this is hardly possible for industrial mixers. In this paper, we present a novel measurement technique which is suitable for opaque or granular flows: consider an instrumented particle, which continuously transmits the force/acceleration acting on it as it is advected in a flow. Its density is adjustable for a wide range of fluids and because of its small size and its wireless data transmission, the system can be used both in industrial and in scientific mixers, allowing for a better understanding of the flow within. We demonstrate the capabilities and precision of the particle by comparing its transmitted acceleration to alternative measurements, in particular in the case of a turbulent von Kármán flow. Our technique proves to be an efficient and fast tool to characterize flows.