| Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices | |
Li HX(李慧鑫)1; Fischer, Andreas3,4; Avila, Marc1,4; Xu D(徐多)1,2
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| Corresponding Author | Xu, Duo([email protected]) |
| Source Publication | EXPERIMENTAL THERMAL AND FLUID SCIENCE
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| 2022-08-01 | |
| Volume | 136Pages:110681 |
| ISSN | 0894-1777 |
| Abstract | Inhomogeneous refractive index fields lead to errors in optical flow velocity measurements. Former respective studies are mostly in quasi two-dimensional flows, and attribute the measurement errors to spatial gradients in the refractive index field, while less attention has been paid to flows with three-dimensional refractive index fields which usually change in space and in time. In this study, ray tracing simulations were carried out in a three-dimensional flow, which is from a direct numerical simulation of single-phase turbulent mixing of two fluids. Given the data of the numerical simulation as reference, the ray tracing simulation is used to quantify the measurement errors of the flow velocity and flow acceleration for tracer-based velocimetry, i.e. particle tracking velocimetry in this study. The errors of both flow velocity and flow acceleration are attributed to the spatial and the spatio-temporal gradients of the refractive indices, respectively, which are closely inherited from flow characteristics. While the dominant type of error depends on the studied flow, the main measurement error for the considered turbulent mixing flow is caused by the random error. When the maximum spatial difference of the refractive indices is about 10-6, the relative random measurement error is about 1 % in velocity and about 200 % in acceleration, respectively. When the maximum index difference is about 10(-2) (water), the relative random measurement errors of velocity and acceleration are 2000 % and 105 %, respectively, for the flow considered in this study. |
| Keyword | Measurement error Tracer-based velocimetry Inhomogeneous refractive index Ray tracing simulation |
| DOI | 10.1016/j.expthermflusci.2022.110681 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000804592800005 |
| WOS Keyword | PARTICLE ; DISTORTION ; MODEL ; PIV |
| WOS Research Area | Thermodynamics ; Engineering ; Physics |
| WOS Subject | Thermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas |
| Funding Project | China Scholarship Council[CSC201804930530] |
| Funding Organization | China Scholarship Council |
| Classification | 二类/Q1 |
| Ranking | 1 |
| Contributor | 徐多 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/89698 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Univ Bremen, Ctr Appl Space Technol & Micrograv ZARM, D-28359 Bremen, Germany; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 3.Univ Bremen, Bremen Inst Metrol Automat & Qual Sci BIMAQ, D-28359 Bremen, Germany; 4.Univ Bremen, MAPEX Ctr Mat & Proc, D-28359 Bremen, Germany |
| Recommended Citation GB/T 7714 | Li HX,Fischer, Andreas,Avila, Marc,et al. Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2022,136:110681.Rp_Au:徐多 |
| APA | 李慧鑫,Fischer, Andreas,Avila, Marc,&徐多.(2022).Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices.EXPERIMENTAL THERMAL AND FLUID SCIENCE,136,110681. |
| MLA | 李慧鑫,et al."Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices".EXPERIMENTAL THERMAL AND FLUID SCIENCE 136(2022):110681. |
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