Visualization of the contact line during the water exit of flat plates
Type | Article | ||||||||||||
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Date | 2017-08 | ||||||||||||
Language | English | ||||||||||||
Author(s) | Tassin Alan1, Breton Thibaut1, 2, Forest Bertrand1, Ohana Jeremy![]() |
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Affiliation(s) | 1 : IFREMER, ZI Pointe Diable, CS 10070, F-29280 Plouzane, France. 2 : ENSTA Bretagne, FRE CNRS 3744, IRDL, F-29806 Brest 09, France. |
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Source | Experiments In Fluids (0723-4864) (Springer), 2017-08 , Vol. 58 , N. 8 , P. 104 (1-9) | ||||||||||||
DOI | 10.1007/s00348-017-2383-1 | ||||||||||||
WOS© Times Cited | 8 | ||||||||||||
Abstract | We investigate experimentally the time evolution of the wetted surface during the lifting of a body initially floating at the water surface. This phenomenon is referred to as the water exit problem. The water exit experiments were conducted with transparent (PMMA) mock-ups of two different shapes: a circular disc and a square flat plate. Two different lighting systems were used to diffuse light in the mock-up material: a central high-power LED light normal to the surface and an edge-lighting system featuring an array of LED lights. These setups make it possible to illuminate the contact line, which delimits the surface of contact between the mock-up and the water. The characteristic size of the mock-ups is about 20 cm and the acceleration of the mock-up oscillates between 0 and 25 m/s2. We show that the central light setup gives satisfactory results for the circular disc and that the edge lighting technique makes it possible to follow a contact line with a time-evolving complex shape (strong changes of convexity) up to 1000 fps. The observations presented in the paper support the possibility of extending this promising technique to more general three-dimensional bodies with arbitrary motion (e.g., including pitch motion). |
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