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oai:www.ideals.illinois.edu:2142/20328 2023-07-10 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

Adrian, Ronald J. van de Wall, Richard Elmer 2011-05-07T12:36:06Z 2011-05-07T12:36:06Z 10000-01-01 1996 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. Made available in DSpace on 2011-05-07T12:36:06Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712468.pdf: 7111081 bytes, checksum: 42798f14e206f0a2705ad5966c691130 (MD5) Previous issue date: 1996 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:43:09Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:18:51-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only 9780591199505 AAI9712468 (UMI)AAI9712468 http://hdl.handle.net/2142/20328 eng Copyright 1996 van de Wall, Richard Elmer Engineering, Mechanical Measurement of properties of gas-solid suspensions using phase-Doppler anemometry text Mechanical Science and Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.