Abstract
Particle modulation to turbulence is investigated experimentally by means of PDPA, PIV and flow visualization for a gas-particle two-phase jet flow. Large particles can enhance the small-scale vortex, so that gas-phase turbulence intensity is increased, while small particles may delay the rolling up of the gas vortex, so that gas-phase turbulence intensity is attenuated. The critical particle size range for such different effects is between 150 σm and 200 σm, corresponding to the Stokes number is between 88 and 157 under the present flow conditions. The PIV results show small particles can retain the gas-phase vortex structure, while large particles can break large vortex structure. The particle Stokes number is not the only judgment standard whether particles enhance or attenuate gas-phase turbulence. The CTI (Change of Turbulence Intensity) number can mark off particle modulation on turbulence in two-phase flow, but more studies are needed.
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Jin Lei Cui: He received his B Sc. (Eng) degree in Engineering Thermophysics in 2002 and M.Sc .(Eng) in Power Engineering and Engineering Thermophysics in 2004 from Tsinghua University. He worked in an industrial company after he graduated. His post research interest was two-phase flow.
Hui Qiang Zhang: He received his M.Sc. (Eng.) degree in Engineering Thermophysics in 1988 from National University of Defence Technology and his Ph.D. in Engineering Thermophysics in 1997 from Tsinghua University. After obtaining Ph.D., he worked at Tsinghua University. He then became an assistant professor, and currently is an associate professor. His current research interests are turbulent two-phase flow and combustion.
Bing Wang: He received his M.Sc. (Eng.) degree in Power Engineering and Engineering Thermophysics in 2002 from Tsinghua University and his Ph.D. in the same speciality in 2004 from the same university. After obtaining Ph. D, he worked as an assistant professor in Tsinghua University. His current research interests are computational fluid dynamics and turbulent two-phase flows.
Yi Rong: She received her B Sc. (Eng.) degree in Engineering aerospace in 2001 from National University of Defence Technology. She studies doctor degree in Tsinghua university after 2001. Her current research interest is turbulent two-phase flow.
Xi Lin Wang: He received his B.Sc. (Eng.) degree in Engineering Mechanics in 1970 from Tsinghua University. After obtaining B. Sc. he worked in Tsinghua University. He then became an assistant professor and an associate professor, and currently is a professor. His current research interests are experimental fluid dynamics, two-phase flows and energy engineering.
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Cui, J.L., Zhang, H.Q., Wang, B. et al. Flow visualization and laser measurement on particle modulation to gas-phase turbulence. J Vis 9, 339–345 (2006). https://doi.org/10.1007/BF03181681
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DOI: https://doi.org/10.1007/BF03181681