• Investigation of CuO, Al$_2$O$_3$ and Ag nanomaterials on unsteady stagnation point flow of Oldroyd-B–power-law nanofluid with viscous dissipation

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      https://www.ias.ac.in/article/fulltext/pram/096/0061

    • Keywords

       

      Oldroyd-B–power-law nanofluid; CuO–xanthan gum nanofluid; Al$_2$O$_3$–xanthan gum nanofluid; Ag– xanthan gum nanofluid; unsteady stagnation-point flow; relaxation–retardation viscous dissipation; modified Cattaneo–Christov heat flux model.

    • Abstract

       

      This paper analyses the unsteady stagnation-point flow of Oldroyd-B-power-law nanofluid, which has the characteristics of viscoelasticity and shear thinning simultaneously. Modified Cattaneo–Christov heat flux modelis used to describe thermal relaxation and thermal retardation in the heat transfer process. Meanwhile, different from the viscous dissipation of Newtonian fluid, based on the constitutive relation of Oldroyd-B–power-law fluid, the effect of relaxation–retardation viscous dissipation is studied. Additionally, 2 g/l xanthan gum solution is considered as the base fluid and copper oxide (CuO), aluminium oxide (Al$_2$O$_3$) and silver (Ag) with 5% volume fraction areused as nanoparticles. Their thermal conductivities are calculated by experiments. Utilising similar transformations, partial differential equations are cast into ordinary differential equations.And non-linear analyses are done by takingadvantage of the double-parameter transformation expansion method with the base function (DPTEM-BF) method. The outcome illustrates that the velocity holds an opposite trend for Deborah numbers for relaxation and retardationtimes. Furthermore, among the three nanofluids, Ag–xanthan gum nanofluid has the strongest ability to increase heat transfer, which can provide a theoretical basis for industrial processing.

    • Author Affiliations

       

      YU BAI1 2 HUILING FANG1 2 YAN ZHANG1 2

      1. School of Science, Beijing University of Civil Engineering and Architecture, Beijing100044, China
      2. Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
    • Dates

       
  • Pramana – Journal of Physics | News

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