Conference Proceedings

Importance of Refractive Index Matching of Fluids for PIV and PLIF Measurements in Buoyant Jets

H Mishra, J Philip

Proceedings of 16th Asian Congress of Fluid Mechanics | Springer | Published : 2021

Abstract

From violent volcanic eruptions to the rising clouds, buoyant jets and plumes are omnipresent in nature at wide range of scales (Woods in Annu Rev Fluid Mech 42:391–412, 2010 [15]). The mixing and growth dynamics of a plume is important in fundamental understanding of turbulence as well as in modeling this complex fluid mechanics phenomenon. This necessitates simultaneous measurements of velocity and density of the mixing fluids. Particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) are the common methods employed for velocity and density measurement. The usual laboratory fluids, salt solution and pure water, however, introduce optical distortions caused by refractive..

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