A single-camera synthetic schlieren method for measuring two-dimensional liquid surfaces

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	A single-camera synthetic schlieren method for measuring two-dimensional liquid surfaces
	Xu D(徐多); Li HX ; Avila M
	2021
会议日期	10 August 2021 到 12 August 2021
会议地点	Virtual, Online
英文摘要	A single-camera synthetic Schlieren method is introduced here to measure two-dimensional topography and depth of dynamic free liquid surfaces. The method is simple and easy to implement. Because of light refraction (following Snell s law), markers on a flat bottom which are seen through the surfaces of a transparent liquid are virtually displaced. This leads to a governing equation that the liquid surface depth (and its topography) is associated with the marker displacement. In the equation, the refractive index of the liquid (e.g. water) can be obtained by a refractometer (or from a technical reference), and the displacements of the markers can be obtained by a cross-correlation method which is usually used in particle image velocimetry. In the equation, the only unknown, the depth of the surface, can be obtained by solving the governing equation with boundary conditions. Unlike free-surface synthetic Schlieren (FS-SS) of Moisy et al. (Exp. Fluids, 1021, 46, 2009), our method does not require a reference depth (which is obtained before or after experiments), so that flows with temporally evolving depth can be measured. Experiments of liquid ripples and dam-break flows were performed to test the method. The results agree well with those obtained with FS-SS and visualization measurements. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.
会议录	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
语种	英语
URL标识	查看原文
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87798]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.MAPEX Center for Materials and Processes, University of Bremen, Bremen, 28359, Germany 2.Center of Applied Space Technology and Microgravity, University of Bremen, Bremen, 28359, Germany 3.State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
推荐引用方式 GB/T 7714	Xu D,Li HX,Avila M. A single-camera synthetic schlieren method for measuring two-dimensional liquid surfaces[C]. 见:. Virtual, Online. 10 August 2021 到 12 August 2021.