Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2000, Volume7

Issue 1

92 pages

Issue price - $140.00

Cristian Ghiaus
LEPTAB — Laboratoire d'Etudes des Phenomenes de Transfert Appliques au Batiment, Universite de La Rochelle France; Technical University of Civil Engineering, Bucharest, Romania

A. Meslem
LEPTAB — Laboratoire d'Etudes des Phenomenes de Transfert Appliques au Batiment, Universite de La Rochelle France

K. Abed-Meraim
LEPTAB — Laboratoire d'Etudes des Phenomenes de Transfert Appliques au Batiment, Universite de La Rochelle France

M. Robitu
LEPTAB — Laboratoire d'Etudes des Phenomenes de Transfert Appliques au Batiment, Universite de La Rochelle France; Technical University of Civil Engineering, Bucharest, Romania

A cold air jet introduced just below a horizontal wall attaches to the wall and then separates from it. The distance between the separation point and the inlet nozzle is an important design parameter for air conditioning systems. Using laser-light sheet visualization, the separation point can be located by either visual observation or image processing. Nevertheless, the unsteadiness of the separation point, induced by the turbulence of the jet, requires tens or hundreds of readings for one determination, making visual measurement tedious and hardly reproducible. As an alternative, the separation point of the jet from the wall may be numerically located where the highest correlation between the image of the jet edges and the template representing the characteristic separation pattern is found in the image. The correlation, calculated using the Discrete Fourier Transform, also gives a measure of the separation point location clarity.

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