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Biomathematical study of time-dependent flow of a Carreau nanofluid through inclined catheterized arteries with overlapping stenosis

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Abstract

This work is concerned with the analysis of blood flow through inclined catheterized arteries having a balloon (angioplasty) with time-variant overlapping stenosis. The nature of blood in small arteries is analyzed mathematically by considering it as a Carreau nanofluid. The highly nonlinear momentum equations of nanofluid model are simplified by considering the mild stenosis case. The formulated problem is solved by a homotopy perturbation expansion in terms of a variant of the Weissenberg number to obtain explicit forms for the axial velocity, the stream function, the pressure gradient, the resistance impedance and the wall shear stress distribution. These solutions depend on the Brownian motion number, thermophoresis number, local temperature Grashof number G r and local nanoparticle Grashof number B r . The results were also studied for various values of the physical parameters, such as the Weissenberg number W i , the power law index n, the taper angle Φ, the maximum height of stenosis δ*, the angle of inclination α, the maximum height of balloon σ*, the axial displacement of the balloon zd*, the flow rate F and the Froud number Fr. The obtained results show that the transmission of axial velocity curves through a Newtonian fluid (W i =0, n=1, G r =0, B r =0, N t =0, N b ≠0) is substantially lower than that through a Carreau nanofluid near the wall of balloon while the inverse occurs in the region between the balloon and stenosis. The streamlines have a clearly distinguished shifting toward the stenotic region and this shifting appears near the wall of the balloon, while it has almost disappeared near the stenotic wall and the trapping bolus in the case of horizontal arteries and Newtonian fluid (W i =0, n=1, G r =0, B r =0, N t =0, N b ≠0) does not appear but for the case of Carreau nanofluid bolus appears.

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Authors and Affiliations

  1. Department of Mathematics, Quaid-I-Azam University, Islamabad 45320, Pakistan

    Ashfaq Ahmed & Sohail Nadeem

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  1. Ashfaq Ahmed
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  2. Sohail Nadeem
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Correspondence to Ashfaq Ahmed.

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Ahmed, A., Nadeem, S. Biomathematical study of time-dependent flow of a Carreau nanofluid through inclined catheterized arteries with overlapping stenosis. J. Cent. South Univ. 24, 2725–2744 (2017). https://doi.org/10.1007/s11771-017-3685-4

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  • DOI: https://doi.org/10.1007/s11771-017-3685-4

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