Turbulence modification by particles in a horizontal pipe flow
Journal article, 2002

Measurements were made of turbulence intensities and turbulent energy spectra in a fully developed, turbulent air-particle pipe flow. The influence of the particles on the turbulence was studied. Measurements were made with spherical particles and particles with a large aspect ratio (pulp fibres). There is a significant change in turbulence intensity at higher particle concentrations with loading ratios of m = 0.1 and 0.03. The measurements show that the turbulence intensity increases close to the centre of the pipe while the turbulence intensity decreases close to the pipe wall for the spherical particles. These results are in agreement with earlier measurements found in the literature. For the fibres, the turbulence intensity decreases over the whole pipe cross-section. Fibre flocs, however, give variations in the mean velocity that result in the production of turbulence in the lower part of the channel.

Hot film

Air–particle flow

Pipe flow



Turbulence modification


Camilla Ljus

Bert Johansson

Alf-Erik Almstedt

Chalmers, Department of Thermo and Fluid Dynamics

Chalmers, Applied Mechanics

International Journal of Multiphase Flow

0301-9322 (ISSN)

Vol. 28 7 1075-1090

Subject Categories

Chemical Engineering

Fluid Mechanics and Acoustics



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