TY - GEN
T1 - Effect of particle size on velocity correlations in turbulent channel flow
AU - Khalitov, Daniel A.
AU - Longmire, Ellen K.
PY - 2003
Y1 - 2003
N2 - The response of glass beads was examined in a fully developed turbulent channel flow of air with Reynolds number Reh=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.
AB - The response of glass beads was examined in a fully developed turbulent channel flow of air with Reynolds number Reh=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.
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U2 - 10.1115/fedsm2003-45730
DO - 10.1115/fedsm2003-45730
M3 - Conference contribution
AN - SCOPUS:0348164411
SN - 0791836967
SN - 9780791836965
T3 - Proceedings of the ASME/JSME Joint Fluids Engineering Conference
SP - 445
EP - 453
BT - Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference
A2 - Ogut, A.
A2 - Tsuji, Y.
A2 - Kawahashi, M.
PB - American Society of Mechanical Engineers
T2 - 4th ASME/JSME Joint Fluids Engineering Conference
Y2 - 6 July 2003 through 10 July 2003
ER -