Optically efficient fluorescent tracers for multi-constituent PIV
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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’.
KeywordsDrop Size Colour Channel Droplet Size Distribution Green Channel Colour Camera
The authors would like to thank the Engineering and Physical Sciences Research Council (EPSRC) for funding under grant reference GR/S69108.
- Chennaoui M, McGhee EJ, Towers CE, Jones AC, Towers DP (2006) Flare Removal in gas phase PIV: optimization of fluorescent tracers. In: 13th International symposium on applied laser techniques to fluid mechanics, Lisbon, Portugal, June 26–29Google Scholar
- Dantec (1998) Linking PIV and LIF to measure two-phase water-bubble flows. Dantec newsletter 5 (1)Google Scholar
- Gharib M, Hernan MA, Yavrouian AH, Sarohia V (1985) Flow velocity measurement by imageprocessing of optically activated tracers. In: AIAA 23rd aerospace sciences meeting (Reno, Nevada, January), American Institute of Aeronautics and Astronautics Journal, Paper No. 85-0172Google Scholar
- Hassan YA (1998) Handbook of fluid dynamics. In: Johnson RW (ed) Multiphase flow measurements using particle image velocimetry, Chap. 36. CRC Press, West Palm Beach. ISBN-10: 0849325099Google Scholar
- McGhee EJ, Towers CE, Chennaoui M, Jones AC, Towers DP (2005) Multi-constituent PIV using fluorescent particles and UV excitation. In: Sixth international symposium on particle image velocimetry, Pasadena, California, USA, September 21–23Google Scholar
- Rottenkolber G, Gindele J, Raposo J, Dullenkopf K, Hentschel W, Wittig S, Spicher U, Merzkirch W (2002) Spray analysis of a gasoline direct injector by means of two-phase PIV. Exp Fluids 32:710–721Google Scholar
- Walther J, Schaller JK, Wirth R, Tropea C (2000) Characterization of cavitating flow fields in transparent diesel injection nozzles using fluorescent particle image velocimetry (FPIV). In: ILASS Europe conference, paper I.8Google Scholar