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Particle image velocimetry in Rayleigh-Be´rnard convection: Photographs with a high number of exposures |
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| Authors: | MP Arroyo T Yonte M Quintanilla JM Saviro n |
| Institution: | aDepartamento de Fisica Aplicada, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, 50009-Zaragoza, Spain bDepartamento de Ciencia y Technologia de Materiales y Flui´dos, Facultad de Ciencias, Universidad de Zaragoza, Ciudad Universitaria, 50009-Zaragoza, Spain |
| Abstract: | We present here an application of particle image velocimetry (PIV) to the analysis of the Rayleigh-Be´nard convection patterns in small ☐es, in which a low power laser (5 mW He-Ne) has been used and photographs with a high number of exposures have been taken. Parameters which affect the quality of photographs are analyzed and related with the number of exposures. The data reduction is made by fringe analysis (point-by-point technique) and by spatial filtering (whole-field technique). The fringe analysis is made with a1 − D integration method, which has been fully automated in the way described here. The velocity field is numerically processed in order to obtain some additional information (like flow rates, vorticity, streamlines, …) which is relevant in fluid mechanics. Finally, results obtained from an application of the whole process to the study of motion in the mid-plane of a Rayleigh-Be´nard cell are shown. |
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