Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.applthermaleng.2019.113790 http://hdl.handle.net/11449/185886 |
Resumo: | The population growth and industrial development increase the demand for energy and the solar energy conversion is an important alternative to complement the world energy matrix. Flat plate solar collectors are devices that convert the solar energy into thermal energy and store the thermal energy in a working fluid, which could reduce the required electricity to heat water. However, an increase in the heat transfer in this type of equipment remains a great challenge. In the current research, two types of longitudinal vortex generators are placed into circular tube of a solar collector in order to enhance the heat transfer between tube walls and working fluid. The numerical modeling is performed by ANSYS 18.0 software and the flow pattern and heat transfer characteristics are analyzed in details for two types of vortex generators (delta-winglet and rectangular-winglet), Reynolds number of 300, 600 and 900, and angle of attack of 15 degrees, 30 degrees and 45 degrees. Ten vortex generators were uniformly arranged on a flat-plate inside the tube. The results show that the delta-winglet and rectangular-winglet longitudinal vortex generators are in fact a passive technique capable to enhance the heat transfer in a solar water heater. The highest heat transfer is obtained for attack of the angle of 45 degrees for both vortex generators, which is more pronounced for the rectangular-winglet vortex generator. However, the best ratio between the heat transfer and the pressure drop penalty is achieved for the delta-winglet vortex generator for angle of attack of 30 degrees. The secondary flow is successfully generated by the inserts, although the corner vortex is observed only by rectangular-winglet vortex generator. Finally, the first vortex generator only impacts on the friction factor and can be removed with no significant losses on the heat transfer. |
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Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heaterSolar water collectorSolar energyHeat transfer enhancementLongitudinal vortex generatorThe population growth and industrial development increase the demand for energy and the solar energy conversion is an important alternative to complement the world energy matrix. Flat plate solar collectors are devices that convert the solar energy into thermal energy and store the thermal energy in a working fluid, which could reduce the required electricity to heat water. However, an increase in the heat transfer in this type of equipment remains a great challenge. In the current research, two types of longitudinal vortex generators are placed into circular tube of a solar collector in order to enhance the heat transfer between tube walls and working fluid. The numerical modeling is performed by ANSYS 18.0 software and the flow pattern and heat transfer characteristics are analyzed in details for two types of vortex generators (delta-winglet and rectangular-winglet), Reynolds number of 300, 600 and 900, and angle of attack of 15 degrees, 30 degrees and 45 degrees. Ten vortex generators were uniformly arranged on a flat-plate inside the tube. The results show that the delta-winglet and rectangular-winglet longitudinal vortex generators are in fact a passive technique capable to enhance the heat transfer in a solar water heater. The highest heat transfer is obtained for attack of the angle of 45 degrees for both vortex generators, which is more pronounced for the rectangular-winglet vortex generator. However, the best ratio between the heat transfer and the pressure drop penalty is achieved for the delta-winglet vortex generator for angle of attack of 30 degrees. The secondary flow is successfully generated by the inserts, although the corner vortex is observed only by rectangular-winglet vortex generator. Finally, the first vortex generator only impacts on the friction factor and can be removed with no significant losses on the heat transfer.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Sao Paulo State Univ, Energy Engn, Av Barrageiros 1881, BR-19274000 Rosana, SP, BrazilSao Paulo State Univ, Dept Mech Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP, BrazilFed Univ ABC, Energy Engn, Av Estados 5001, BR-09210580 Santo Andre, SP, BrazilSao Paulo State Univ, Energy Engn, Av Barrageiros 1881, BR-19274000 Rosana, SP, BrazilSao Paulo State Univ, Dept Mech Engn, Av Brasil 56, BR-15385000 Ilha Solteira, SP, BrazilFAPESP: 2017/00608-0FAPESP: 2016/14620-9Elsevier B.V.Universidade Estadual Paulista (Unesp)Fed Univ ABCSilva, Felipe A. S. da [UNESP]Dezan, Daniel J.Pantaleao, Aluisio V. [UNESP]Salviano, Leandro O. [UNESP]2019-10-04T12:39:31Z2019-10-04T12:39:31Z2019-07-25info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10http://dx.doi.org/10.1016/j.applthermaleng.2019.113790Applied Thermal Engineering. Oxford: Pergamon-elsevier Science Ltd, v. 158, 10 p., 2019.1359-4311http://hdl.handle.net/11449/18588610.1016/j.applthermaleng.2019.113790WOS:000474673800038Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Thermal Engineeringinfo:eu-repo/semantics/openAccess2021-10-23T15:54:55Zoai:repositorio.unesp.br:11449/185886Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T15:54:55Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater |
title |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater |
spellingShingle |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater Silva, Felipe A. S. da [UNESP] Solar water collector Solar energy Heat transfer enhancement Longitudinal vortex generator |
title_short |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater |
title_full |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater |
title_fullStr |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater |
title_full_unstemmed |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater |
title_sort |
Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater |
author |
Silva, Felipe A. S. da [UNESP] |
author_facet |
Silva, Felipe A. S. da [UNESP] Dezan, Daniel J. Pantaleao, Aluisio V. [UNESP] Salviano, Leandro O. [UNESP] |
author_role |
author |
author2 |
Dezan, Daniel J. Pantaleao, Aluisio V. [UNESP] Salviano, Leandro O. [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Fed Univ ABC |
dc.contributor.author.fl_str_mv |
Silva, Felipe A. S. da [UNESP] Dezan, Daniel J. Pantaleao, Aluisio V. [UNESP] Salviano, Leandro O. [UNESP] |
dc.subject.por.fl_str_mv |
Solar water collector Solar energy Heat transfer enhancement Longitudinal vortex generator |
topic |
Solar water collector Solar energy Heat transfer enhancement Longitudinal vortex generator |
description |
The population growth and industrial development increase the demand for energy and the solar energy conversion is an important alternative to complement the world energy matrix. Flat plate solar collectors are devices that convert the solar energy into thermal energy and store the thermal energy in a working fluid, which could reduce the required electricity to heat water. However, an increase in the heat transfer in this type of equipment remains a great challenge. In the current research, two types of longitudinal vortex generators are placed into circular tube of a solar collector in order to enhance the heat transfer between tube walls and working fluid. The numerical modeling is performed by ANSYS 18.0 software and the flow pattern and heat transfer characteristics are analyzed in details for two types of vortex generators (delta-winglet and rectangular-winglet), Reynolds number of 300, 600 and 900, and angle of attack of 15 degrees, 30 degrees and 45 degrees. Ten vortex generators were uniformly arranged on a flat-plate inside the tube. The results show that the delta-winglet and rectangular-winglet longitudinal vortex generators are in fact a passive technique capable to enhance the heat transfer in a solar water heater. The highest heat transfer is obtained for attack of the angle of 45 degrees for both vortex generators, which is more pronounced for the rectangular-winglet vortex generator. However, the best ratio between the heat transfer and the pressure drop penalty is achieved for the delta-winglet vortex generator for angle of attack of 30 degrees. The secondary flow is successfully generated by the inserts, although the corner vortex is observed only by rectangular-winglet vortex generator. Finally, the first vortex generator only impacts on the friction factor and can be removed with no significant losses on the heat transfer. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-04T12:39:31Z 2019-10-04T12:39:31Z 2019-07-25 |
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/10.1016/j.applthermaleng.2019.113790 Applied Thermal Engineering. Oxford: Pergamon-elsevier Science Ltd, v. 158, 10 p., 2019. 1359-4311 http://hdl.handle.net/11449/185886 10.1016/j.applthermaleng.2019.113790 WOS:000474673800038 |
url |
http://dx.doi.org/10.1016/j.applthermaleng.2019.113790 http://hdl.handle.net/11449/185886 |
identifier_str_mv |
Applied Thermal Engineering. Oxford: Pergamon-elsevier Science Ltd, v. 158, 10 p., 2019. 1359-4311 10.1016/j.applthermaleng.2019.113790 WOS:000474673800038 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Thermal Engineering |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
10 |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science 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_ |
1803047351760191488 |