NDLI: Refractive Index Matching for Optical Flow Investigation With High Density Stratification

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Refractive Index Matching for Optical Flow Investigation With High Density Stratification

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Krohn, Benedikt Qin, Sunming Manera, Annalisa Petrov, Victor
Copyright Year	2018
Abstract	Turbulent mixing in density stratified environments represents a challenging task in experimental turbulence research. When optical measurement techniques like Particle Image Velocimetry (PIV) are applied to stratified liquids, it is common practice to combine two aqueous solutions with different densities but equal refractive indices. As a result, light deflections/distortions due to the mixing of the fluids can be suppressed. While refractive image matching (RIM) was developed in the late ’70s, the limit of a 4% density ratio had yet to be reported before this work. In the present work, a methodology based on the behavior of changes in a multi component system while mixing is presented. This methodology allows RIM for solutions with higher density differences. The applicability of this methodology is experimentally demonstrated with a turbulent buoyant jet using a ternary combination of water, isopropanol and glycerol, for which an index matched density ratio of 8.6% has been achieved (Krohn et al. 2018). Measurements were conducted with a high fidelity synchronized PIV/PLIF system and the results are qualitatively compared in terms of turbulent statistics.
Sponsorship	Fluids Engineering Division
File Format	PDF
ISBN	9780791851555
DOI	10.1115/FEDSM2018-83245
Volume Number	Volume 1: Flow Manipulation and Active Control; Bio-Inspired Fluid Mechanics; Boundary Layer and High-Speed Flows; Fluids Engineering Education; Transport Phenomena in Energy Conversion and Mixing; Turbulent Flows; Vortex Dynamics; DNS/LES and Hybrid RANS/LES Methods; Fluid Structure Interaction; Fluid Dynamics of Wind Energy; Bubble, Droplet, and Aerosol Dynamics
Conference Proceedings	ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting
Language	English
Publisher Date	2018-07-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Water Image registration Optical measurement Turbulence Fluids Deflection Refractive index Particulate matter Statistics as topic Density Flow (dynamics)
Content Type	Text
Resource Type	Article

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