Near-wall velocity measurements by particle-shadow tracking |
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Authors: | Pierre Lancien Éric Lajeunesse François Métivier |
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Institution: | (1) Laboratoire de Dynamique des Fluides Géologiques, Institut de Physique du Globe de Paris, 4 Place Jussieu, 75252 Paris cedex 05, France |
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Abstract: | We report a new method to measure the velocity of a fluid in the vicinity of a wall. The method, that we call particle-shadow
tracking (PST), simply consists in seeding the fluid with a small number of fine tracer particles of density close to that
of the fluid. The position of each particle and of its shadow on the wall are then tracked simultaneously, allowing one to
accurately determine the distance separating tracers from the wall and therefore to extract the velocity field. We present
an application of the method to the determination of the velocity profile inside a laminar density current flowing along an
inclined plane. |
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Keywords: | |
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