Measurement of properties of gas-solid suspensions using phase-Doppler anemometry
van de Wall, Richard Elmer
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https://hdl.handle.net/2142/20328
Description
Title
Measurement of properties of gas-solid suspensions using phase-Doppler anemometry
Author(s)
van de Wall, Richard Elmer
Issue Date
1996
Doctoral Committee Chair(s)
Adrian, Ronald J.
Department of Study
Mechanical Science and Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
A detailed investigation to quantify flow properties of a dense turbulent air-solid suspension in a horizontal pipe was undertaken. The flow properties were measured along vertical and horizontal diameters using Phase Doppler Anemometry which was a nonintrusive technique that measured the size and velocity of particles within the suspension flow. Phase Doppler Anemometry was used to determine flow properties that depended on the density of the particle phase and to discriminate between the particle phase and the air phase.
The experiments were conducted in a closed recirculating 127 mm inner diameter copper pipe system. The particles were glass beads with a mean diameter of approximately 50 $\mu$m. The bulk air velocity settings were 10, 12.5, 15, and 17.5 m/s and the two mean particle volume fractions were $5.0\times 10\sp{-3}$ and $1.0\times 10\sp{-2}.$
Phase Doppler Anemometry used a measuring volume which did not satisfy the volume averaging criterion to determine particle cloud properties. A counterpart to volume averaging was developed that used time averaging to determine properties of the particle phase. The counterpart to volume averaging allowed the determination of particle cloud properties such as, density, axial velocity, and the axial components of the Reynolds stress. The time averaging removed details of high frequency fluctuations and required the use of a window shifting algorithm to capture the lost high frequency fluctuations. With this technique, the velocity correlation and diffusivity were calculated. At high mass flow ratios, the particle phase density displayed broadband behavior at low frequencies while the particle cloud velocity showed a spectrum that was nearly periodic. At lower mass flow ratios, this periodicity was not present in either density or velocity.
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