Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices

doi:10.1016/j.expthermflusci.2022.110681

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	Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices
	Li HX(李慧鑫)1; Fischer, Andreas 3,4; Avila, Marc 1,4; Xu D(徐多)1,2
通讯作者	Xu, Duo(duo.xu@imech.ac.cn)
发表期刊	EXPERIMENTAL THERMAL AND FLUID SCIENCE
	2022-08-01
卷号	136 页码:110681
ISSN	0894-1777
摘要	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.
关键词	Measurement error Tracer-based velocimetry Inhomogeneous refractive index Ray tracing simulation
DOI	10.1016/j.expthermflusci.2022.110681
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000804592800005
关键词[WOS]	PARTICLE ; DISTORTION ; MODEL ; PIV
WOS研究方向	Thermodynamics ; Engineering ; Physics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas
资助项目	China Scholarship Council[CSC201804930530]
项目资助者	China Scholarship Council
论文分区	二类/Q1
力学所作者排名	1
RpAuthor	徐多
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/89698
专题	非线性力学国家重点实验室
作者单位	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
推荐引用方式 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.
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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