Measurement of turbulent spectra of particle-laden flows in a horizontal channel |
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Authors: | T Hädrich |
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Affiliation: | SIVUS gGmbH Institut für Verfahrens-, Umwelt- und Sensortechnik an der Technischen Universit?t Chemnitz Schulstr. 38, 09125 Chemnitz, Germany e-mail: kontakt@sivus.tu-chemnitz.de, DE
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Abstract: | Frequency spectra of air turbulence of particle-laden flows were investigated by use of a laser-Doppler velocimeter to discover
the eddy-length scales that are influenced by the transported particles. The influence of glass and steel particles of 100–1,000 μm
diameter was measured in a horizontal channel and a horizontal pipe for the streamwise and transverse components of the velocity
vector. Particles that were small compared with the integral length scale of the particle-laden flow decrease the turbulent
power density of the greatest eddies in varying degrees, depending on mass loading and distance from the wall. All fractions
create turbulence in their wakes, the size of which depends on loading and slip velocity. These results support the hypothesis
that the particles consume energy by following the large eddies that are much greater than the particle diameters, and in
so doing, turbulence is created by this energy.
Received: 28 September 2000/Accepted: 9 April 2001 |
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