Single-camera PTV within interfacially sheared drops in microgravity
Single-camera PTV within interfacially sheared drops in microgravity
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DOI：
10.1007/s00348-023-03697-6
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发表时间：
2023-09-01
影响因子：
2.4
通讯作者：
Hirsa，Amir H.
中科院分区：
文献类型：
--
作者：
McMackin，Patrick M.;Adam，Joe A.;Hirsa，Amir H.
原位粒子跟踪测速（PTV）的实验方法的发展是允许测量运动系统的非量身定制的测速的基础。这项调查的重点是单摄像机PTV的后处理方法的发展，没有激光片照明，跟踪原生气泡作为示踪剂颗粒内的人胰岛素液滴在微重力。人胰岛素作为足够复杂的非牛顿流体系统用于测试流体测量方法。国际空间站上被称为环剪切滴（RSD）的微重力技术为PTV情景提供了便利，该技术产生了适合作为PTV研究试验台的光学成像情景和流体流动几何形状。进行的后处理方法包括五个步骤：（i）物理系统表征和天然气泡示踪剂识别，（ii）图像投影和单相机校准，（iii）深度确定和3D粒子位置确定，（iv）射线跟踪和折射校正，以及（v）粒子历史和次优粒子的数据扩展。总的来说，这种后处理方法成功地允许在一个场景中，没有以前可能的粒子测量总数为1085。这种后处理方法有希望应用于其他原位PTV场景，从而更好地理解其流量难以测量和/或由于物理或安全约束而不允许使用PTV专用光学元件（例如激光片和双摄像机设置）的物理系统。
Development of experimental methods for in situ particle tracking velocimetry (PTV) is fundamental for allowing measurement of moving systems non-tailored for velocimetry. This investigation focuses on the development of a post-processing methodology for single-camera PTV, without laser-sheet illumination, tracking native air bubbles as tracer particles within a liquid drop of human insulin in microgravity. Human insulin functioned as a sufficiently complex, non-Newtonian fluid system for testing fluid measurement methodology. The PTV scenario was facilitated by microgravity technology known as the ring-sheared drop (RSD), aboard the International Space Station, which produced an optical imaging scenario and fluid flow geometry suitable as a testbed for PTV research. The post-processing methodology performed included five steps: (i) physical system characterization and native air bubble tracer identification, (ii) image projection and single-camera calibration, (iii) depth determination and 3D particle position determination, (iv) ray tracing and refraction correction, and (v) particle history and data expansion for suboptimal particles. Overall, this post-processing methodology successfully allowed for a total of 1085 particle measurements in a scenario where none were previously possible. Such post-processing methodologies have promise for application to other in situ PTV scenarios allowing better understanding of physical systems whose flow is difficult to measure and/or where PTV-specific optical elements (such as laser light sheets and dual-camera setups) are not permissible due to physical or safety constraints.