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Flow velocity

About: Flow velocity is a(n) research topic. Over the lifetime, 23771 publication(s) have been published within this topic receiving 425438 citation(s). The topic is also known as: macroscopic velocity (continuum mechanics) & flow velocity (fluid dynamics).

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Papers
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Open accessJournal ArticleDOI: 10.1016/0004-3702(81)90024-2
Abstract: Optical flow cannot be computed locally, since only one independent measurement is available from the image sequence at a point, while the flow velocity has two components. A second constraint is needed. A method for finding the optical flow pattern is presented which assumes that the apparent velocity of the brightness pattern varies smoothly almost everywhere in the image. An iterative implementation is shown which successfully computes the optical flow for a number of synthetic image sequences. The algorithm is robust in that it can handle image sequences that are quantized rather coarsely in space and time. It is also insensitive to quantization of brightness levels and additive noise. Examples are included where the assumption of smoothness is violated at singular points or along lines in the image.

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Topics: Image restoration (59%), Optical flow (59%), Feature detection (computer vision) (58%) ...read more

10,249 Citations


Open accessProceedings ArticleDOI: 10.1117/12.965761
12 Nov 1981-
Abstract: Optical flow cannot be computed locally, since only one independent measurement is available from the image sequence at a point, while the flow velocity has two components. A second constraint is needed. A method for finding the optical flow pattern is presented which assumes that the apparent velocity of the brightness pattern varies smoothly almost everywhere in the image. An iterative implementation is shown which successfully computes the optical flow for a number of synthetic image sequences. The algorithm is robust in that it can handle image sequences that are quantized rather coarsely in space and time. It is also insensitive to quantization of brightness levels and additive noise. Examples are included where the assumption of smoothness is violated at singular points or along lines in the image.

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Topics: Optical flow (59%), Horn–Schunck method (59%), Motion field (59%) ...read more

8,045 Citations


Open accessJournal ArticleDOI: 10.1103/PHYSREVE.62.756
01 Jul 2000-Physical Review E
Abstract: Solids dispersed in a drying drop will migrate to the edge of the drop and form a solid ring. This phenomenon produces ringlike stains and occurs for a wide range of surfaces, solvents, and solutes. Here we show that the migration is caused by an outward flow within the drop that is driven by the loss of solvent by evaporation and geometrical constraint that the drop maintain an equilibrium droplet shape with a fixed boundary. We describe a theory that predicts the flow velocity, the rate of growth of the ring, and the distribution of solute within the drop. These predictions are compared with our experimental results.

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Topics: Drop (liquid) (65%), Pressure drop (65%), Spinning drop method (64%) ...read more

1,874 Citations


Book ChapterDOI: 10.1007/978-3-642-83787-6_4
01 Jan 1989-
Abstract: One of the most challenging and time-consuming problems in experimental fluid mechanics is the measurement of the overall flow field properties, such as the velocity, vorticity, and pressure fields. Local measurements of the velocity field (i.e., at individual points) are now done routinely in many experiments using hot-wire (HW) or laser velocimetry (LV). However, many of the flow fields of current interest, such as coherent structures in shear flows or wake flows, are highly unsteady. HW or LV data of such flows are difficult to interpret, as both spatial and temporal information of the entire flow field are required and these methods are commonly limited to simultaneous measurements at only a few spatial locations.

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Topics: Velocimetry (64%), Particle tracking velocimetry (63%), Particle image velocimetry (61%) ...read more

1,798 Citations


Open access
J. C. R. Hunt1, A. A. Wray2, Parviz Moin3Institutions (3)
01 Dec 1988-
Abstract: Recent studies of turbulent shear flows have shown that many of their important kinematical and dynamical properties can be more clearly understood by describing the flows in terms of individual events or streamline patterns These events or flow regions are studied because they are associated with relatively large contributions to certain average properties of the flow, for example kinetic energy, Reynolds stress, or to particular processes in the flow, such as mixing and chemical reactions, which may be concentrated at locations where streamlines converge for fast chemical reactions (referred to as convergence or C regions), or in recirculating eddying regions for slow chemical reactions The aim of this project was to use the numerical simulations to develop suitable criteria for defining these eddying or vortical zones The C and streaming (S) zones were defined in order to define the whole flow field It is concluded that homogeneous and sheared turbulent flow fields are made up of characteristic flow zones: eddy, C, and S zones A set of objective criteria were found which describe regions in which the streamlines circulate, converge or diverge, and form high streams of high velocity flow

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Topics: Streamlines, streaklines, and pathlines (55%), Turbulence (55%), Shear flow (53%) ...read more

1,481 Citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202224
2021781
2020845
2019886
2018816
2017819

Top Attributes

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Topic's top 5 most impactful authors

Huan J. Keh

24 papers, 353 citations

Tasawar Hayat

23 papers, 489 citations

Oluwole Daniel Makinde

19 papers, 444 citations

Gauri Shanker Seth

15 papers, 305 citations

Ilyas Khan

13 papers, 194 citations

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