Effect of particle size on velocity correlations in turbulent channel flow

Daniel A. Khalitov, Ellen K Longmire

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations

Abstract

The response of glass beads was examined in a fully developed turbulent channel flow of air with Reynolds number Re h=4500 where h is the channel half width. Five sets of monodisperse particles were tested with integral Stokes numbers in the range 0.2-10 at the channel centerplane. Particle-to-air mass loadings were of order 10%. Laser sheets were aligned in streamwise-spanwise flow planes, and seeded, particle-laden flow was imaged with a dual-frame camera. A separation algorithm was used to obtain simultaneous gas and particle velocity measurements of homogeneous flow planes over a range of wall-normal distances. Profiles of single-point velocity statistics including mean and rms slip velocity, particle drift velocity, and gas-particle correlation were computed. In addition, two-point gas-particle and particle-particle velocity correlations were obtained. Near the wall, the gas-gas correlations yielded long, narrow patterns related to near-wall low-speed streaks. At the centerplane, the correlations were broader in the spanwise direction. Gas-particle and particle-particle correlations resembled the gas correlations in shape and size, but the values were smaller. The gas-particle covariance tended toward zero for St = 10. Particle-particle correlations were still significant for St = 4.

Original languageEnglish (US)
Title of host publicationProceedings of the 4th ASME/JSME Joint Fluids Engineering Conference
Subtitle of host publicationVolume 2, Part A, Symposia
EditorsA. Ogut, Y. Tsuji, M. Kawahashi, A. Ogut, Y. Tsuji, M. Kawahashi
Pages445-453
Number of pages9
StatePublished - Dec 1 2003
Event4th ASME/JSME Joint Fluids Engineering Conference - Honolulu, HI, United States
Duration: Jul 6 2003Jul 10 2003

Publication series

NameProceedings of the ASME/JSME Joint Fluids Engineering Conference
Volume2 A

Other

Other4th ASME/JSME Joint Fluids Engineering Conference
CountryUnited States
CityHonolulu, HI
Period7/6/037/10/03

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