Foam flow of oil-refrigerant R12 mixture in a small diameter tube
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1678-58782006000400003 http://hdl.handle.net/11449/213043 |
Resumo: | This paper presents an experimental investigation of the mineral oil ISO VG10-refrigerant R12 mixture flow with foam formation in a straight horizontal 3.22 mm ID, 6.0 m long tube. An experimental apparatus was designed to allow the measurement of both pressure and temperature profiles along the tube as well as the visualization of the flow patterns. Tests were performed at different mass flow rates, several refrigerant mass fractions at the inlet of the flow, and inlet mixture temperatures around 29.0 °C. At the inlet of the tube a liquid mixture flow was visualized. In this region, both temperature and pressure gradient were constant. As the flow proceeded towards the exit of the tube the pressure drop produced a reduction of the refrigerant solubility in the oil yielding to the formation of the first bubbles. Initially, small and few bubbles could be noticed and the flow behaved as a bubbly flow. Eventually, the bubble population increased and foam flow pattern was observed at the exit of the tube. Due to the large formation of bubbles, both the temperature and the pressure of the mixture were substantially reduced in this region. Visualization results also showed that both flow regimes (bubbly and foam) were intermittent. |
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Repositório Institucional da UNESP |
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Foam flow of oil-refrigerant R12 mixture in a small diameter tubeOil-refrigerant mixturefoam flowtwo-phase flow patternflashing flowThis paper presents an experimental investigation of the mineral oil ISO VG10-refrigerant R12 mixture flow with foam formation in a straight horizontal 3.22 mm ID, 6.0 m long tube. An experimental apparatus was designed to allow the measurement of both pressure and temperature profiles along the tube as well as the visualization of the flow patterns. Tests were performed at different mass flow rates, several refrigerant mass fractions at the inlet of the flow, and inlet mixture temperatures around 29.0 °C. At the inlet of the tube a liquid mixture flow was visualized. In this region, both temperature and pressure gradient were constant. As the flow proceeded towards the exit of the tube the pressure drop produced a reduction of the refrigerant solubility in the oil yielding to the formation of the first bubbles. Initially, small and few bubbles could be noticed and the flow behaved as a bubbly flow. Eventually, the bubble population increased and foam flow pattern was observed at the exit of the tube. Due to the large formation of bubbles, both the temperature and the pressure of the mixture were substantially reduced in this region. Visualization results also showed that both flow regimes (bubbly and foam) were intermittent.Universidade Estadual Paulista, Department of Mechanical EngineeringBrazilian Petroleum S.A, Scientific Methods Group at R & D CenterABCMUniversidade Estadual Paulista, Department of Mechanical EngineeringAssociação Brasileira de Engenharia e Ciências Mecânicas - ABCMUniversidade Estadual Paulista (Unesp)Brazilian Petroleum S.AABCMPoiate Jr., EdgardGasche, José Luiz [UNESP]2021-07-14T10:49:07Z2021-07-14T10:49:07Z2006-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article390-398application/pdfhttp://dx.doi.org/10.1590/S1678-58782006000400003Journal of the Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro, RJ, Brazil: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, v. 28, n. 4, p. 390-398, 2006.1678-58781806-3691http://hdl.handle.net/11449/21304310.1590/S1678-58782006000400003S1678-58782006000400003S1678-58782006000400003.pdfSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Brazilian Society of Mechanical Sciences and Engineeringinfo:eu-repo/semantics/openAccess2024-07-04T20:06:15Zoai:repositorio.unesp.br:11449/213043Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:04:16.969532Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube |
title |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube |
spellingShingle |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube Poiate Jr., Edgard Oil-refrigerant mixture foam flow two-phase flow pattern flashing flow |
title_short |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube |
title_full |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube |
title_fullStr |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube |
title_full_unstemmed |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube |
title_sort |
Foam flow of oil-refrigerant R12 mixture in a small diameter tube |
author |
Poiate Jr., Edgard |
author_facet |
Poiate Jr., Edgard Gasche, José Luiz [UNESP] |
author_role |
author |
author2 |
Gasche, José Luiz [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Brazilian Petroleum S.A ABCM |
dc.contributor.author.fl_str_mv |
Poiate Jr., Edgard Gasche, José Luiz [UNESP] |
dc.subject.por.fl_str_mv |
Oil-refrigerant mixture foam flow two-phase flow pattern flashing flow |
topic |
Oil-refrigerant mixture foam flow two-phase flow pattern flashing flow |
description |
This paper presents an experimental investigation of the mineral oil ISO VG10-refrigerant R12 mixture flow with foam formation in a straight horizontal 3.22 mm ID, 6.0 m long tube. An experimental apparatus was designed to allow the measurement of both pressure and temperature profiles along the tube as well as the visualization of the flow patterns. Tests were performed at different mass flow rates, several refrigerant mass fractions at the inlet of the flow, and inlet mixture temperatures around 29.0 °C. At the inlet of the tube a liquid mixture flow was visualized. In this region, both temperature and pressure gradient were constant. As the flow proceeded towards the exit of the tube the pressure drop produced a reduction of the refrigerant solubility in the oil yielding to the formation of the first bubbles. Initially, small and few bubbles could be noticed and the flow behaved as a bubbly flow. Eventually, the bubble population increased and foam flow pattern was observed at the exit of the tube. Due to the large formation of bubbles, both the temperature and the pressure of the mixture were substantially reduced in this region. Visualization results also showed that both flow regimes (bubbly and foam) were intermittent. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-12 2021-07-14T10:49:07Z 2021-07-14T10:49:07Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S1678-58782006000400003 Journal of the Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro, RJ, Brazil: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, v. 28, n. 4, p. 390-398, 2006. 1678-5878 1806-3691 http://hdl.handle.net/11449/213043 10.1590/S1678-58782006000400003 S1678-58782006000400003 S1678-58782006000400003.pdf |
url |
http://dx.doi.org/10.1590/S1678-58782006000400003 http://hdl.handle.net/11449/213043 |
identifier_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Rio de Janeiro, RJ, Brazil: Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM, v. 28, n. 4, p. 390-398, 2006. 1678-5878 1806-3691 10.1590/S1678-58782006000400003 S1678-58782006000400003 S1678-58782006000400003.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of the Brazilian Society of Mechanical Sciences and Engineering |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
390-398 application/pdf |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM |
publisher.none.fl_str_mv |
Associação Brasileira de Engenharia e Ciências Mecânicas - ABCM |
dc.source.none.fl_str_mv |
SciELO reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129280321781760 |