Repositori URV

Author, as appears in the article.: Kazemi, Koorosh; Vernet, Anton; Grau, Francesc X; Cito, Salvatore; Fabregat, Alexandre

Department: Enginyeria Mecànica

URV's Author/s: Cito, Salvatore / Fabregat Tomàs, Alexandre / Grau Vidal, Francesc Xavier / Kazemi, Koorosh / Vernet Peña, Antonio

Keywords: Shear thinning fluid Shear thickening fluid Newtonian fluid Mass-transfer Mass transfer Bubble rising single bubble shear thinning fluid shear thickening fluid power-law numerical-simulation newtonian fluid motion mass transfer heat fluid sphere

Abstract: The scalar transfer rate from a bubble to a quiescent fluid with Carreau rheological behavior is studied here with Bond and Galilei number values respectively equal to 30 and 2 and a non-dimensional inelastic time constant (λ) equal to 6. Under these conditions the bubble dynamics regime stays within the steady and oscillatory areas. Navier Stokes equations are solved numerically in a non-stationary three dimensional domain and are coupled to the mass transfer equation of a scalar. The effect of the Peclet number (Pe) and flow index (n) of the quiescent fluid on the Sherwood number is explored within the following range: 10<Pe<1000, and 0.3<n<1.7. We observed that the shear thinning rheology destabilizes the bubble flow dynamics from steady towards an oscillatory regime and increases transfer rates between the bubble and surrounding fluids. This trend became even more prominent as Pe increased. Our results are condensed into an empirical predictive correlation that outperforms previous similar correlations and can be used to estimate the heat and mass transfer rate at the bubble interface in a Carreau liquid in a transition regime at a specific Galilei and Bond numbers.

Thematic Areas: Physics and astronomy (miscellaneous) Physics and astronomy (all) Mechanics Mechanical engineering Matemática / probabilidade e estatística General physics and astronomy Fluid flow and transfer processes Engenharias iv Engenharias iii Engenharias ii Ciência de alimentos Ciência da computação Biodiversidade

licence for use: https://creativecommons.org/licenses/by/3.0/es/

Author's mail: koorosh.kazemi@urv.cat koorosh.kazemi@urv.cat salvatore.cito@urv.cat alexandre.fabregat@urv.cat anton.vernet@urv.cat francescxavier.grau@urv.cat

Author identifier: 0000-0001-7626-3374 0000-0002-6032-2605 0000-0002-7028-1368 0000-0002-4077-7338

Record's date: 2024-10-12

Papper version: info:eu-repo/semantics/publishedVersion

Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: International Journal Of Multiphase Flow. 150 104000-

APA: Kazemi, Koorosh; Vernet, Anton; Grau, Francesc X; Cito, Salvatore; Fabregat, Alexandre (2022). Passive scalar transfer rate at bubble interface in Carreau liquid in a transition regime. International Journal Of Multiphase Flow, 150(), 104000-. DOI: 10.1016/j.ijmultiphaseflow.2022.104000

Entity: Universitat Rovira i Virgili

Journal publication year: 2022

Publication Type: Journal Publications