Investigation of nonpenetrative thermal convection using stereoscopic particle image velocimetry

Ajay K. Prasad; Ronald J. Adrian

doi:10.1117/12.163749

2 December 1993 Investigation of nonpenetrative thermal convection using stereoscopic particle image velocimetry

Ajay K. Prasad, Ronald J. Adrian

Proceedings Volume 2005, Optical Diagnostics in Fluid and Thermal Flow; (1993) https://doi.org/10.1117/12.163749
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

Non-penetrative thermal convection in a large-aspect-ratio container of water has been studied using stereoscopic Particle Image Velocimetry (PIV) to measure 3D velocity vectors in planar domains. The unique aspects of this work are the application of stereoscopic PIV in highly turbulent flow with significant small-scale energy, and the application of a liquid-filled test section which requires significant corrections for aberrations. Velocity data were obtained for three different cases of non-penetrative convection, corresponding to convective velocities, w_*, of 3, 4, and 5 mm/s. For each case, a sequence of about 20 pairs of stereo- photographs were recorded in a vertical plane, with sufficient time separation between photographs to ensure statistical independence at least for the turbulent motions with time- scales on the order of z_*/w_*. The grid-spacing of the resulting velocity fields was adequate to resolve the smallest structures in the flow.

Citation Download Citation

Ajay K. Prasad and Ronald J. Adrian "Investigation of nonpenetrative thermal convection using stereoscopic particle image velocimetry", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); https://doi.org/10.1117/12.163749

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