Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/38379
Registo completo
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Ferrás, Luís Jorge Lima | por |
dc.contributor.author | Afonso, A. M. | por |
dc.contributor.author | Alves, M. A. | por |
dc.contributor.author | Nóbrega, J. M. | por |
dc.contributor.author | Pinho, F. T. | por |
dc.contributor.author | Carneiro, O. S. | por |
dc.date.accessioned | 2015-11-23T17:42:01Z | - |
dc.date.available | 2015-11-23T17:42:01Z | - |
dc.date.issued | 2014 | - |
dc.identifier.citation | Ferrás, L.L.; Afonso A.M.; Nóbrega,J.M.; Alves M.A.; Pinho F.T.; Carneiro O.S., Slip flows of Newtonian and viscoelastic fluids in a 4:1 contraction, J. Non-Newtonian Fluid Mechanics 214 28–37, 2014. | por |
dc.identifier.issn | 0377-0257 | por |
dc.identifier.uri | https://hdl.handle.net/1822/38379 | - |
dc.description.abstract | This work presents a numerical study of the 4:1 planar contraction flow of a viscoelastic fluid described by the simplified Phan-Thien–Tanner model under the influence of slip boundary conditions at the channel walls. The linear Navier slip law was considered with the dimensionless slip coefficient varying in the range ½0; 4500. The simulations were carried out for a small constant Reynolds number of 0.04 and Deborah numbers (De) varying between 0 and 5. Convergence could not be achieved for higher values of the Deborah number, especially for large values of the slip coefficient, due to the large stress gradients near the singularity of the reentrant corner. Increasing the slip coefficient leads to the formation of two vortices, a corner and a lip vortex. The lip vortex grows with increasing slip until it absorbs the corner vortex, creating a single large vortex that continues to increase in size and intensity. In the range De = 3–5 no lip vortex was formed. The flow is characterized in detail for De ¼ 1 as function of the slip coefficient, while for the remaining De only the main features are shown for specific values of the slip coefficient. | por |
dc.description.sponsorship | The authors gratefully acknowledge funding by COMPETE, FEDER and Fundacao para a Ciencia e a Tecnologia (FCT) through projects PEst-C/CTM/LA0025/2013 (Strategic Project - LA 25 - 2013-2014, PTDC/EME-MFE/113988/2009 and PTDC/EME-MFE/114322/2009. AMA would also like to thank FCT for the financial support through the scholarship SFRH/BPD/75436/2010. | por |
dc.language.iso | eng | por |
dc.publisher | Elsevier 1 | por |
dc.rights | openAccess | por |
dc.subject | Contraction | por |
dc.subject | Slip boundary condition | por |
dc.subject | Model | por |
dc.subject | Finite volume method | por |
dc.subject | 4:1 contraction | por |
dc.subject | sPTT model | por |
dc.title | Slip flows of Newtonian and viscoelastic fluids in a 4:1 contraction | por |
dc.type | article | - |
dc.peerreviewed | yes | por |
sdum.publicationstatus | published | por |
oaire.citationStartPage | 28 | por |
oaire.citationEndPage | 37 | por |
oaire.citationTitle | Journal of Non-Newtonian Fluid Mechanics | por |
oaire.citationVolume | 214 | por |
dc.identifier.doi | 10.1016/j.jnnfm.2014.09.007 | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Journal of Non-Newtonian Fluid Mechanics | por |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
Slip flows of Newtonian and viscoelastic fluids in a 4_1 contraction.pdf | 2,12 MB | Adobe PDF | Ver/Abrir |