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Modelling and simulation of temperature and concentration dispersion in a couple stress nanofluid flow through stenotic tapered arteries

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Abstract.

A couple stress fluid model with the suspension of silver nanoparticles is proposed in order to investigate theoretically the natural convection of temperature and concentration. In particular, the flow is considered in an artery with an obstruction wherein the rheology of blood is taken as a couple stress fluid. The effects of the permeability of the stenosis and the treatment procedure involving a catheter are also considered in the model. The obtained non-linear momentum, temperature and concentration equations are solved using the homotopy perturbation method. Nanoparticles and the two viscosities of the couple stress fluid seem to play a significant role in the flow regime. The pressure drop, flow rate, resistance to the fluid flow and shear stress are computed and their effects are analyzed with respect to various fluids and geometric parameters. Convergence of the temperature and its dependency on the degree of deformation is effectively depicted. It is observed that the Nusselt number increases as the volume fraction increases. Hence magnification of molecular thermal dispersion can be achieved by increasing the nanoparticle concentration. It is also observed that concentration dispersion is greater for severe stenosis and it is maximum at the first extrema. The secondary flow of the axial velocity in the stenotic region is observed and is asymmetric in the tapered artery. The obtained results can be utilized in understanding the increase in heat transfer and enhancement of mass dispersion, which could be used for drug delivery in the treatment of stenotic conditions.

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Authors and Affiliations

  1. Department of Applied Mathematics, Defence Institute of Advanced Technology, 411025, Pune, India

    J. V. Ramana Reddy, D. Srikanth & Samir K. Das

Authors
  1. J. V. Ramana Reddy
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  2. D. Srikanth
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  3. Samir K. Das
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Correspondence to D. Srikanth.

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Ramana Reddy, J.V., Srikanth, D. & Das, S.K. Modelling and simulation of temperature and concentration dispersion in a couple stress nanofluid flow through stenotic tapered arteries. Eur. Phys. J. Plus 132, 365 (2017). https://doi.org/10.1140/epjp/i2017-11643-1

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  • DOI: https://doi.org/10.1140/epjp/i2017-11643-1

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