1994
DOI: 10.1016/0009-2509(94)85093-3
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Random fluctuations in a fluidized bed

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Cited by 38 publications
(11 citation statements)
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“…In case of a Reynolds averaged solid volume fraction ͗͘ of 0.05 ͑conditions I.a.i in Table I͒, Zenit and Hunt 36 observed two main types of solid fraction fluctuations: large-amplitude low frequency fluctuations ͑Ͻ3 Hz͒ and small-amplitude high frequency fluctuations ͑Ͼ3 Hz͒. The latter are induced by interphase interactions, local hydrodynamics, and particle-particle collisions 37 and are hence related to mesoscale fluctuations ͑e.g., clusters, streamers͒. Focusing on the high frequency fluctuations by filtering out the low frequency fluctuations, Zenit and Hunt 36 found that the magnitude of the solid fraction fluctuations depends on the average solid volume fraction ͗͘ and the Stokes number.…”
Section: E Indirect Contribution To the Generalized Added Massmentioning
confidence: 97%
“…In case of a Reynolds averaged solid volume fraction ͗͘ of 0.05 ͑conditions I.a.i in Table I͒, Zenit and Hunt 36 observed two main types of solid fraction fluctuations: large-amplitude low frequency fluctuations ͑Ͻ3 Hz͒ and small-amplitude high frequency fluctuations ͑Ͼ3 Hz͒. The latter are induced by interphase interactions, local hydrodynamics, and particle-particle collisions 37 and are hence related to mesoscale fluctuations ͑e.g., clusters, streamers͒. Focusing on the high frequency fluctuations by filtering out the low frequency fluctuations, Zenit and Hunt 36 found that the magnitude of the solid fraction fluctuations depends on the average solid volume fraction ͗͘ and the Stokes number.…”
Section: E Indirect Contribution To the Generalized Added Massmentioning
confidence: 97%
“…Theoretical works on particle velocity fluctuations in response to microscopic particle number fluctuations in the absence of largescale shearing have received much less attention, especially at high particle inertia. 5 For particles with small inertia, the characteristic viscous relaxation time is very short compared with the characteristic particle collision time, and the particle fluctuation velocity is dominated by anisotropic and long-range correlated particlefluid interactions, which can be well predicted by Segrè's model. 6 The model has been based on the balance between the rate of gravitational potential increment in a correlated spatial region and the rate of viscous dissipation.…”
mentioning
confidence: 96%
“…FFT of the slip velocity signal from the simulation shows two types of fluctuations: local and global ones. The local fluctuations are related to the local hydrodynamics like particle collisions and inter‐phase interactions . The global fluctuations are described on the basis of global hydrodynamics, which includes the behavior of particle clusters.…”
Section: Resultsmentioning
confidence: 99%