Abstract
The interactions between dispersed particles and fluid turbulence have been investigated experimentally and numerically in a fully-developed downflow channel in water. Particle velocities and fluid velocities in the presence of 340 and 500 μt glass beads were measured by digital particle image velocimetry, at particle mass loadings up to 3.2 × 10 −2 . These particles were comparable to or slightly greater than the Kolmogorov lengthscale of flow. Streamwise mean particle velocities exceed the mean fluid velocity profile, which was unmodified by particle loading. Fluid turbulence was augmented by the addition of particles. Turbulence was more strongly augmented in the streamwise than in the transverse direction, because the turbulence energy increases at large scales in the streamwise direction. The Reynolds stress in laden flow was also changed, yielding to increase the rate of production of turbulence kinetic energy. Turbulence augmentation is caused by particle concentration fluctuation which increases the turbulence energy in low-wave-number region.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
