3D Eulerian modeling of thin rectangular gas–solid fluidized beds: Estimation of the specularity coefficient and its effects on bubbling dynamics and circulation times.
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| Title: | 3D Eulerian modeling of thin rectangular gas–solid fluidized beds: Estimation of the specularity coefficient and its effects on bubbling dynamics and circulation times. |
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| Authors: | Altantzis, C.1 altantzis@gmail.com, Bates, R.B.1, Ghoniem, A.F.1 |
| Source: | Powder Technology. Jan2015 Part A, Vol. 270, p256-270. 15p. |
| Subjects: | Gas-solid interfaces, Fluidized bed gasifiers, Boundary value problems, Simulation methods & models, Estimation theory |
| Abstract: | This study aims at investigating the influence of the wall boundary conditions and specifically the specularity coefficient on the fluidization behavior of a thin rectangular fluidized bed by means of 3D numerical simulation employing an Eulerian description of the gas and the solid phases. Thin rectangular fluidized beds have been extensively used in the research literature since it is assumed that the flow behaves like a simpler two-dimensional flow and hence they offer validation data for 2D simulations. However, the effects of the front and the back walls are significant, influencing the sensitivity of the fluidization hydrodynamics to the third dimension whose consideration is thus necessary. In order to investigate the influence of the specularity coefficient, ϕ (a parameter controlling the momentum transfer from the particles to the wall), on the fluidization hydrodynamics, a parametric analysis is conducted and the response of the bubble dynamics, reflecting the gasmotion, and the circulation fluxes, displaying the solids motion, are examined in detail. The computational results are compared with available experimental data in order to determine the values of ϕ that lead to the accurate description of the fluidization hydrodynamics via a two-fold validation strategy which involves the calculation of the circulation time and the solids concentration maps. It is observed that the appropriate value of the specularity coefficient depends rather strongly on the superficial gas velocity of the bed. [ABSTRACT FROM AUTHOR] |
| Copyright of Powder Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 99896954 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: 3D Eulerian modeling of thin rectangular gas–solid fluidized beds: Estimation of the specularity coefficient and its effects on bubbling dynamics and circulation times. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Altantzis%2C+C%2E%22">Altantzis, C.</searchLink><relatesTo>1</relatesTo><i> altantzis@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Bates%2C+R%2EB%2E%22">Bates, R.B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ghoniem%2C+A%2EF%2E%22">Ghoniem, A.F.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Powder+Technology%22">Powder Technology</searchLink>. Jan2015 Part A, Vol. 270, p256-270. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Gas-solid+interfaces%22">Gas-solid interfaces</searchLink><br /><searchLink fieldCode="DE" term="%22Fluidized+bed+gasifiers%22">Fluidized bed gasifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+value+problems%22">Boundary value problems</searchLink><br /><searchLink fieldCode="DE" term="%22Simulation+methods+%26+models%22">Simulation methods & models</searchLink><br /><searchLink fieldCode="DE" term="%22Estimation+theory%22">Estimation theory</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This study aims at investigating the influence of the wall boundary conditions and specifically the specularity coefficient on the fluidization behavior of a thin rectangular fluidized bed by means of 3D numerical simulation employing an Eulerian description of the gas and the solid phases. Thin rectangular fluidized beds have been extensively used in the research literature since it is assumed that the flow behaves like a simpler two-dimensional flow and hence they offer validation data for 2D simulations. However, the effects of the front and the back walls are significant, influencing the sensitivity of the fluidization hydrodynamics to the third dimension whose consideration is thus necessary. In order to investigate the influence of the specularity coefficient, ϕ (a parameter controlling the momentum transfer from the particles to the wall), on the fluidization hydrodynamics, a parametric analysis is conducted and the response of the bubble dynamics, reflecting the gasmotion, and the circulation fluxes, displaying the solids motion, are examined in detail. The computational results are compared with available experimental data in order to determine the values of ϕ that lead to the accurate description of the fluidization hydrodynamics via a two-fold validation strategy which involves the calculation of the circulation time and the solids concentration maps. It is observed that the appropriate value of the specularity coefficient depends rather strongly on the superficial gas velocity of the bed. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Powder Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.powtec.2014.10.029 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 256 Subjects: – SubjectFull: Gas-solid interfaces Type: general – SubjectFull: Fluidized bed gasifiers Type: general – SubjectFull: Boundary value problems Type: general – SubjectFull: Simulation methods & models Type: general – SubjectFull: Estimation theory Type: general Titles: – TitleFull: 3D Eulerian modeling of thin rectangular gas–solid fluidized beds: Estimation of the specularity coefficient and its effects on bubbling dynamics and circulation times. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Altantzis, C. – PersonEntity: Name: NameFull: Bates, R.B. – PersonEntity: Name: NameFull: Ghoniem, A.F. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2015 Part A Type: published Y: 2015 Identifiers: – Type: issn-print Value: 00325910 Numbering: – Type: volume Value: 270 Titles: – TitleFull: Powder Technology Type: main |
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