TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1115/IMECE1999-0818 http://hdl.handle.net/11449/223232 |
Resumo: | Unsteady flow of oil and refrigerant gas through radial clearance in rolling piston compressors has been modeled as a heterogeneous mixture, where the properties are determined from the species conservation transport equation coupled with momentum and energy equations. Time variations of pressure, tangential velocity of the rolling piston and radial clearance due to pump setting have been included in the mixture flow model. Those variables have been obtained by modeling the compression process, rolling piston dynamics and by using geometric characteristics of the pump, respectively. An important conclusion concerning this work is the large variation of refrigerant concentration in the oil-filled radial clearance during the compression cycle. That is particularly true for large values of mass flow rates, and for those cases the flow mixture cannot be considered as having uniform concentration. In presence of low mass flow rates homogeneous flow prevail and the mixture tend to have a uniform concentration. In general, it was observed that for calculating the refngerant mass flow rate using the difference in refiigerant concentration between compression and suction chambers, a time average value for the gas concentration should be used at the clearance inlet. |
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Repositório Institucional da UNESP |
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TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORSUnsteady flow of oil and refrigerant gas through radial clearance in rolling piston compressors has been modeled as a heterogeneous mixture, where the properties are determined from the species conservation transport equation coupled with momentum and energy equations. Time variations of pressure, tangential velocity of the rolling piston and radial clearance due to pump setting have been included in the mixture flow model. Those variables have been obtained by modeling the compression process, rolling piston dynamics and by using geometric characteristics of the pump, respectively. An important conclusion concerning this work is the large variation of refrigerant concentration in the oil-filled radial clearance during the compression cycle. That is particularly true for large values of mass flow rates, and for those cases the flow mixture cannot be considered as having uniform concentration. In presence of low mass flow rates homogeneous flow prevail and the mixture tend to have a uniform concentration. In general, it was observed that for calculating the refngerant mass flow rate using the difference in refiigerant concentration between compression and suction chambers, a time average value for the gas concentration should be used at the clearance inlet.Department of Mechanical Engineering Universidade Estadual Paulista -UNESP, SPDepartment of Mechanical Engineering Federal University of Santa Catarina, SCDepartment of Mechanical Engineering Universidade Estadual Paulista -UNESP, SPUniversidade Estadual Paulista (UNESP)Universidade Federal de Santa Catarina (UFSC)Gasche, José L. [UNESP]Ferreira, Rogério T. S.Praia, Álvaro T.2022-04-28T19:49:29Z2022-04-28T19:49:29Z1999-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject119-127http://dx.doi.org/10.1115/IMECE1999-0818ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), v. 1999-B, p. 119-127.http://hdl.handle.net/11449/22323210.1115/IMECE1999-08182-s2.0-85122696615Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)info:eu-repo/semantics/openAccess2022-04-28T19:49:29Zoai:repositorio.unesp.br:11449/223232Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:49:29Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS |
title |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS |
spellingShingle |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS Gasche, José L. [UNESP] |
title_short |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS |
title_full |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS |
title_fullStr |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS |
title_full_unstemmed |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS |
title_sort |
TRANSIENT FLOW OF THE OIL-REFRIGERANT MIXTURE THROUGH THE RADIAL CLEARANCE IN ROLLING PISTON COMPRESSORS |
author |
Gasche, José L. [UNESP] |
author_facet |
Gasche, José L. [UNESP] Ferreira, Rogério T. S. Praia, Álvaro T. |
author_role |
author |
author2 |
Ferreira, Rogério T. S. Praia, Álvaro T. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Universidade Federal de Santa Catarina (UFSC) |
dc.contributor.author.fl_str_mv |
Gasche, José L. [UNESP] Ferreira, Rogério T. S. Praia, Álvaro T. |
description |
Unsteady flow of oil and refrigerant gas through radial clearance in rolling piston compressors has been modeled as a heterogeneous mixture, where the properties are determined from the species conservation transport equation coupled with momentum and energy equations. Time variations of pressure, tangential velocity of the rolling piston and radial clearance due to pump setting have been included in the mixture flow model. Those variables have been obtained by modeling the compression process, rolling piston dynamics and by using geometric characteristics of the pump, respectively. An important conclusion concerning this work is the large variation of refrigerant concentration in the oil-filled radial clearance during the compression cycle. That is particularly true for large values of mass flow rates, and for those cases the flow mixture cannot be considered as having uniform concentration. In presence of low mass flow rates homogeneous flow prevail and the mixture tend to have a uniform concentration. In general, it was observed that for calculating the refngerant mass flow rate using the difference in refiigerant concentration between compression and suction chambers, a time average value for the gas concentration should be used at the clearance inlet. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-01-01 2022-04-28T19:49:29Z 2022-04-28T19:49:29Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1115/IMECE1999-0818 ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), v. 1999-B, p. 119-127. http://hdl.handle.net/11449/223232 10.1115/IMECE1999-0818 2-s2.0-85122696615 |
url |
http://dx.doi.org/10.1115/IMECE1999-0818 http://hdl.handle.net/11449/223232 |
identifier_str_mv |
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), v. 1999-B, p. 119-127. 10.1115/IMECE1999-0818 2-s2.0-85122696615 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
119-127 |
dc.source.none.fl_str_mv |
Scopus 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_ |
1803650045148397568 |