Utilize este identificador para referenciar este registo: https://hdl.handle.net/1822/73548

TítuloCFD-DEM modeling of particle-laden viscoelastic flows in hydraulic fracturing operations
Autor(es)Fernandes, C.
Faroughi, Salah Aldin
Ribeiro, R.
McKinley, Gareth Huw
Palavras-chaveRandom arrays of spheres
Discrete particle method
Drag coefficient
Viscoelastic fluids
Oldroyd-B model
Eulerian-Lagrangian formulation
Data2020
Resumo(s)The ability to simulate the behavior of dense suspensions, using computationally-efficient Eulerian-Lagrangian techniques, requires accurate particulate-phase drag models that are valid for a wide range of process fluids and material parameters. The currently available closed-form drag models – which enable rapid calculation of the momentum exchange between the continuous and dispersed phases – are only valid for dilute suspensions with inelastic base fluids. The present work aims at developing appropriate drag models for moderately-dense suspensions (particle volume fractions < 20%), in which the continuous phase has viscoelastic characteristics. To this end, we parametrize the suspension properties through the Deborah number and the particle volume fraction, and compute the evolution in the drag coefficient of spheres translating through a viscoelastic fluid that is described by the Oldroyd-B model. To calculate the drag coefficient, we resort to three-dimensional direct numerical simulations (DNS) of unconfined viscoelastic creeping flows (Re < 0.1) past random arrays of stationary spheres, over a wide range of Deborah numbers (De < 5), volume fractions (φ < 20%) and particle configurations. From these calculations we obtain a closure law F(De, φ) for the drag force in a fluid described by the quasi-linear Oldroyd-B viscoelastic fluid model (with fixed retardation ratio β=0.5), which is, on average, within 4.7% of the DNS results. Subsequently, this closure law was incorporated into a CFD-DEM Eulerian-Lagrangian solver to handle particle-laden viscoelastic flow calculations, and two case studies were simulated to assess the accuracy and robustness of our numerical approach. These tests consisted of simulating the settling process in Newtonian and viscoelastic fluids within eccentric annular pipes and rectangular channels; configurations commonly employed in hydraulic fracturing operations. The numerical results obtained were found to be in good agreement with experimental data available for suspensions in Newtonian matrix fluids. For the case of viscoelastic fluids, the resulting particle distribution is presented for different elasticity numbers (i.e., El = De/Re) and particle volume fractions, and the results provide additional insights into the pronounced effects of viscoelastic matrix fluids in hydraulic fracturing operations
TipoComunicação oral
URIhttps://hdl.handle.net/1822/73548
Versão da editorahttps://www.ucd.ie/openfoam2021/
Arbitragem científicano
AcessoAcesso aberto
Aparece nas coleções:IPC - Outras publicações/Other publications

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
OFW16_abstract_Celio.pdf145,58 kBAdobe PDFVer/Abrir

Partilhe no FacebookPartilhe no TwitterPartilhe no DeliciousPartilhe no LinkedInPartilhe no DiggAdicionar ao Google BookmarksPartilhe no MySpacePartilhe no Orkut
Exporte no formato BibTex mendeley Exporte no formato Endnote Adicione ao seu ORCID