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 Title: Measurement of properties of gas-solid suspensions using phase-Doppler anemometry Author(s): van de Wall, Richard Elmer Doctoral Committee Chair(s): Adrian, Ronald J. Department / Program: Mechanical Science and Engineering Discipline: Mechanical Engineering Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Engineering, Mechanical 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. Issue Date: 1996 Type: Text Language: English URI: http://hdl.handle.net/2142/20328 ISBN: 9780591199505 Rights Information: Copyright 1996 van de Wall, Richard Elmer Date Available in IDEALS: 2011-05-07 Identifier in Online Catalog: AAI9712468 OCLC Identifier: (UMI)AAI9712468
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