caa a22 4500 605466777 CHVBK 20210128100308.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00397-015-0887-2 doi (NATIONALLICENCE)springer-10.1007/s00397-015-0887-2 Linear stability analysis and nonlinear simulation of non-Newtonian viscous fingering instability in heterogeneous porous media [Elektronische Daten] [Mohammad Shoghi, Mahmood Norouzi] The viscous fingering instability of miscible displacements in the presence of permeability heterogeneity is studied. Shear-thinning fluids are successful to suppress this instability where the mobility ratio is high and/or the heterogeneity of the porous medium is adverse. The displacing fluid is considered a non-Newtonian fluid, and the shear-thinning characters of it have been modeled using the Carreau-Yasuda constitutive equation. Two different heterogeneity models are used in this simulation, one in which the permeability decreases in transverse direction exponentially and the other in which the permeability decreases and increases exponentially in longitudinal direction, separately. In particular, the role of permeability heterogeneities on the differences between Newtonian and non-Newtonian fluids is investigated through linear stability analysis and nonlinear simulation. In nonlinear simulations, using a spectral method based on the Hartley transforms, nonlinear finger interactions, mixing lengths, sweep efficiencies, and transversely average concentration are examined and compared in Newtonian and non-Newtonian displacements. Springer-Verlag Berlin Heidelberg, 2015 Viscous fingering nationallicence Heterogeneous porous media nationallicence Shear-thinning fluid nationallicence Shoghi Mohammad Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran aut Norouzi Mahmood Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran aut Rheologica Acta Springer Berlin Heidelberg 54/11-12(2015-12-01), 973-991 0035-4511 54:11-12<973 2015 54 397 https://doi.org/10.1007/s00397-015-0887-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0887-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shoghi Mohammad Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran aut NATIONALLICENCE 700 1- Norouzi Mahmood Mechanical Engineering Department, Shahrood University of Technology, Shahrood, Iran aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/11-12(2015-12-01), 973-991 0035-4511 54:11-12<973 2015 54 397