Abstract
This paper was motivated by the need for improved instrumentation to study mixing processes in multi-constituent and multi-phase fluid systems. The development of a single colour camera PIV system that can image micron size spectrally distinct fluorescent droplets in a multi-constituent gas phase flow is reported. Concentrations of fluorescent dyes in solution have been optimised to achieve sufficient fluorescence visibility. The adopted philosophy is to exploit the inherent co-registration offered by a 3-chip colour CCD camera with the images recorded in the three colour planes enabling flow constituent/phase to be determined as well as pulse order. The results show that the spectral discrimination process is robust and in a well mixed gas-phase flow the average error between the flow velocities in the two constituents is <4%. The use of UV excitation (on suitably excitable dyes) has the added benefit of spectrally separating the excitation wavelength from the imaging bandwidth to allow ‘flare removal’.
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The authors would like to thank the Engineering and Physical Sciences Research Council (EPSRC) for funding under grant reference GR/S69108.
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Angarita-Jaimes, D.A., Ormsby, M.P., Chennaoui, M. et al. Optically efficient fluorescent tracers for multi-constituent PIV. Exp Fluids 45, 623–631 (2008). https://doi.org/10.1007/s00348-008-0558-5
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DOI: https://doi.org/10.1007/s00348-008-0558-5