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Please use this identifier to cite or link to this item: https://libjncir.jncasr.ac.in/xmlui/handle/10572/2158
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dc.contributor.authorAnsari, Istafaul H.
dc.contributor.authorAlam, Meheboob
dc.date.accessioned2017-01-24T06:26:35Z-
dc.date.available2017-01-24T06:26:35Z-
dc.date.issued2016
dc.identifier.citationAnsari, I. H.; Alam, M., Pattern transition, microstructure, and dynamics in a two-dimensional vibrofluidized granular bed. Physical Review E 2016, 93 (5), 17 http://dx.doi.org/10.1103/PhysRevE.93.052901en_US
dc.identifier.citationPhysical Review Een_US
dc.identifier.citation93en_US
dc.identifier.issnExperiments are conducted in a two-dimensional monolayer vibrofluidized bed of glass beads, with a goal to understand the transition scenario and the underlying microstructure and dynamics in different patterned states. At small shaking accelerations (Gamma = A omega(2)/g < 1, where A and omega = 2 pi f are the amplitude and angular frequency of shaking and g is the gravitational acceleration), the particles remain attached to the base of the vibrating container; this is known as the solid bed (SB). With increasing Gamma (at large enough shaking amplitude A/d) and/or with increasing A/d (at large enough Gamma), the sequence of transitions/bifurcations unfolds as follows: SB ("solid bed") to BB ("bouncing bed") to LS ("Leidenfrost state") to "2-roll convection" to "1-roll convection" and finally to a gas-like state. For a given length of the container, the coarsening of multiple convection rolls leading to the genesis of a "single-roll" structure (dubbed the multiroll transition) and its subsequent transition to a granular gas are two findings of this work. We show that the critical shaking intensity (Gamma(LS)(BB)) for the BB -> LS transition has a power-law dependence on the particle loading (F = h(0)/d, where h(0) is the number of particle layers at rest and d is the particle diameter) and the shaking amplitude (A/d). The characteristics of BB and LS states are studied by calculating (i) the coarse-grained density and temperature profiles and (ii) the pair correlation function. It is shown that while the contact network of particles in the BB state represents a hexagonal-packed structure, the contact network within the "floating cluster" of the LS resembles a liquid-like state. An unsteadiness of the Leidenfrost state has been uncovered wherein the interface (between the floating cluster and the dilute collisional layer underneath) and the top of the bed are found to oscillate sinusoidally, with the oscillation frequency closely matching the frequency of external shaking. Therefore, the granular Leidenfrost state is a period-1 wave as is the case for the BB state.
dc.identifier.urihttps://libjncir.jncasr.ac.in/xmlui/10572/2158-
dc.descriptionhttp://dx.doi.org/10.1103/PhysRevE.93.052901en_US
dc.description.abstract@American Physical Society, 2016en_US
dc.description.uri2470-0045en_US
dc.description.uri2470-0053en_US
dc.language.iso5en_US
dc.publisherEnglishen_US
dc.rightsAmerican Physical Societyen_US
dc.subjectPhysicsen_US
dc.subjectPlane Couette-Flowen_US
dc.subjectNonlinear Stabilityen_US
dc.subjectConvection Cellsen_US
dc.subjectVibrating Bedsen_US
dc.subjectFluidizationen_US
dc.subjectBehavioren_US
dc.subjectBifurcationen_US
dc.subjectInstabilityen_US
dc.subjectSimulationen_US
dc.subjectSeparationen_US
dc.titlePattern transition, microstructure, and dynamics in a two-dimensional vibrofluidized granular beden_US
dc.typeArticleen_US
Appears in Collections:Research Articles (Meheboob Alam)

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