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Modelling of dispersed bubble and droplet flow at high phase fractions
The present paper describes an Eulerian two-fluid model for the prediction of dispersed two-phase (gas/liquid and liquid/liquid) flow at high volume fractions of the dispersed phase. The model is based on the standard Eulerian approaches for modelling two-phase flow that have hitherto been limited i...
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Published in: | Chemical engineering science 2004-03, Vol.59 (4), p.759-770 |
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container_title | Chemical engineering science |
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creator | Behzadi, A. Issa, R.I. Rusche, H. |
description | The present paper describes an Eulerian two-fluid model for the prediction of dispersed two-phase (gas/liquid and liquid/liquid) flow at high volume fractions of the dispersed phase. The model is based on the standard Eulerian approaches for modelling two-phase flow that have hitherto been limited in validity to dilute systems. An extension to high phase fractions is made here and this involves two aspects. First, the closure models for inter-phase forces (namely drag and lift) are modified to account for the high concentration of the dispersed phase. Second, a turbulence model based on the
k–
ε equations for the mixture of the two phases is formulated. This turbulence model is suitable for computations at all phase fraction values and reduces to the equivalent single phase model in the extremes when only one or other of the phases is present. The model uses a response function to link the turbulent fluctuations of the continuous and dispersed phases. The variation of this response function with phase fraction is determined from experimental evidence made available recently. The overall model is applied to the prediction of air/water bubble flow in a pipe with a sudden enlargement where phase fractions can reach 25% and for which experimental data exist. The calculations show that marked improvement in the quality of the predictions, as compared to measurements, is obtained over the available model for dilute systems. |
doi_str_mv | 10.1016/j.ces.2003.11.018 |
format | article |
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k–
ε equations for the mixture of the two phases is formulated. This turbulence model is suitable for computations at all phase fraction values and reduces to the equivalent single phase model in the extremes when only one or other of the phases is present. The model uses a response function to link the turbulent fluctuations of the continuous and dispersed phases. The variation of this response function with phase fraction is determined from experimental evidence made available recently. The overall model is applied to the prediction of air/water bubble flow in a pipe with a sudden enlargement where phase fractions can reach 25% and for which experimental data exist. The calculations show that marked improvement in the quality of the predictions, as compared to measurements, is obtained over the available model for dilute systems.</description><identifier>ISSN: 0009-2509</identifier><identifier>EISSN: 1873-4405</identifier><identifier>DOI: 10.1016/j.ces.2003.11.018</identifier><identifier>CODEN: CESCAC</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Applied sciences ; Bubbles ; Chemical engineering ; Droplets ; Eulerian model ; Exact sciences and technology ; High phase fraction ; Miscellaneous ; Multiphase flow</subject><ispartof>Chemical engineering science, 2004-03, Vol.59 (4), p.759-770</ispartof><rights>2003 Elsevier Ltd</rights><rights>2004 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c356t-91d374578e59867ced2724f4433ff7c57fbb65ed5885eaaccdd4954756080d403</citedby><cites>FETCH-LOGICAL-c356t-91d374578e59867ced2724f4433ff7c57fbb65ed5885eaaccdd4954756080d403</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27923,27924</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=15558688$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Behzadi, A.</creatorcontrib><creatorcontrib>Issa, R.I.</creatorcontrib><creatorcontrib>Rusche, H.</creatorcontrib><title>Modelling of dispersed bubble and droplet flow at high phase fractions</title><title>Chemical engineering science</title><description>The present paper describes an Eulerian two-fluid model for the prediction of dispersed two-phase (gas/liquid and liquid/liquid) flow at high volume fractions of the dispersed phase. The model is based on the standard Eulerian approaches for modelling two-phase flow that have hitherto been limited in validity to dilute systems. An extension to high phase fractions is made here and this involves two aspects. First, the closure models for inter-phase forces (namely drag and lift) are modified to account for the high concentration of the dispersed phase. Second, a turbulence model based on the
k–
ε equations for the mixture of the two phases is formulated. This turbulence model is suitable for computations at all phase fraction values and reduces to the equivalent single phase model in the extremes when only one or other of the phases is present. The model uses a response function to link the turbulent fluctuations of the continuous and dispersed phases. The variation of this response function with phase fraction is determined from experimental evidence made available recently. The overall model is applied to the prediction of air/water bubble flow in a pipe with a sudden enlargement where phase fractions can reach 25% and for which experimental data exist. The calculations show that marked improvement in the quality of the predictions, as compared to measurements, is obtained over the available model for dilute systems.</description><subject>Applied sciences</subject><subject>Bubbles</subject><subject>Chemical engineering</subject><subject>Droplets</subject><subject>Eulerian model</subject><subject>Exact sciences and technology</subject><subject>High phase fraction</subject><subject>Miscellaneous</subject><subject>Multiphase flow</subject><issn>0009-2509</issn><issn>1873-4405</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><recordid>eNp9kMFKxDAQhoMouK4-gLdc9NaatEmT4kkWV4UVL3oOaTLZzVKbmnQV394sK3jzNAx8_wzfj9AlJSUltLnZlgZSWRFSl5SWhMojNKNS1AVjhB-jGSGkLSpO2lN0ltI2r0JQMkPL52Ch7_2wxsFh69MIMYHF3a7resB6sNjGMPYwYdeHL6wnvPHrDR43OgF2UZvJhyGdoxOn-wQXv3OO3pb3r4vHYvXy8LS4WxWm5s1UtNTWgnEhgbeyEQZsJSrmGKtr54ThwnVdw8FyKTlobYy1rOVM8IZIYhmp5-j6cHeM4WMHaVLvPpksoAcIu6QqWbGqaWgG6QE0MaQUwakx-ncdvxUlat-Y2qrcmNo3pihVubGcufo9rpPRfZYbjE9_Qc65bOSeuz1wkE0_PUSVjIch2_gIZlI2-H--_AD5xH_1</recordid><startdate>20040301</startdate><enddate>20040301</enddate><creator>Behzadi, A.</creator><creator>Issa, R.I.</creator><creator>Rusche, H.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope></search><sort><creationdate>20040301</creationdate><title>Modelling of dispersed bubble and droplet flow at high phase fractions</title><author>Behzadi, A. ; Issa, R.I. ; Rusche, H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c356t-91d374578e59867ced2724f4433ff7c57fbb65ed5885eaaccdd4954756080d403</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2004</creationdate><topic>Applied sciences</topic><topic>Bubbles</topic><topic>Chemical engineering</topic><topic>Droplets</topic><topic>Eulerian model</topic><topic>Exact sciences and technology</topic><topic>High phase fraction</topic><topic>Miscellaneous</topic><topic>Multiphase flow</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Behzadi, A.</creatorcontrib><creatorcontrib>Issa, R.I.</creatorcontrib><creatorcontrib>Rusche, H.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><jtitle>Chemical engineering science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Behzadi, A.</au><au>Issa, R.I.</au><au>Rusche, H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Modelling of dispersed bubble and droplet flow at high phase fractions</atitle><jtitle>Chemical engineering science</jtitle><date>2004-03-01</date><risdate>2004</risdate><volume>59</volume><issue>4</issue><spage>759</spage><epage>770</epage><pages>759-770</pages><issn>0009-2509</issn><eissn>1873-4405</eissn><coden>CESCAC</coden><abstract>The present paper describes an Eulerian two-fluid model for the prediction of dispersed two-phase (gas/liquid and liquid/liquid) flow at high volume fractions of the dispersed phase. The model is based on the standard Eulerian approaches for modelling two-phase flow that have hitherto been limited in validity to dilute systems. An extension to high phase fractions is made here and this involves two aspects. First, the closure models for inter-phase forces (namely drag and lift) are modified to account for the high concentration of the dispersed phase. Second, a turbulence model based on the
k–
ε equations for the mixture of the two phases is formulated. This turbulence model is suitable for computations at all phase fraction values and reduces to the equivalent single phase model in the extremes when only one or other of the phases is present. The model uses a response function to link the turbulent fluctuations of the continuous and dispersed phases. The variation of this response function with phase fraction is determined from experimental evidence made available recently. The overall model is applied to the prediction of air/water bubble flow in a pipe with a sudden enlargement where phase fractions can reach 25% and for which experimental data exist. The calculations show that marked improvement in the quality of the predictions, as compared to measurements, is obtained over the available model for dilute systems.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ces.2003.11.018</doi><tpages>12</tpages></addata></record> |
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subjects | Applied sciences Bubbles Chemical engineering Droplets Eulerian model Exact sciences and technology High phase fraction Miscellaneous Multiphase flow |
title | Modelling of dispersed bubble and droplet flow at high phase fractions |
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