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      https://www.ias.ac.in/article/fulltext/pram/095/0005

    • Keywords

       

      Metal oxide nanoparticles; hybrid base fluid; dual solutions; stability analysis; unsteady stagnationpoint flow.

    • Abstract

       

      This paper deals with a detailed investigation of the effects of various metal oxide nanoparticles on unsteady stagnation point flow of a hybrid base fluid impinging on a flat surface. The ‘single-phase’ nanofluid model, i.e., the Tiwari and Das model, is considered for the study. We consider water and ethylene glycol in 1:1 ratio as the base fluid and four different types of metal oxides, namely, CuO, TiO$_2$, ZnO and MgO as the nanoparticles. Using similarity transformations, the conservation equations are transformed into self-similar ordinary differential equations. Dual and unique similarity solutions are obtained for certain set of values of parameters. The analysis explores many important findings. Dual self-similar solutions exist up to a certain critical value of the decelerating unsteady parameter and the critical value is independent of the type of metal oxide nanoparticles considered. The strongest surface drag force is observed for the nanofluid with CuO nanoparticles, while the weakest is for the nanofluid with MgO nanoparticles. The heat transfer rate is highest for the nanofluid with CuO nanoparticles and lowest for the nanofluid with TiO$_2$ nanoparticles. Also, the boundary layer is thickest for the nanofluid with MgO nanoparticles.

    • Author Affiliations

       

      AMIT KUMAR PANDEY1 SOHITA RAJPUT1 KRISHNENDU BHATTACHARYYA1 PRECIOUS SIBANDA2

      1. Department of Mathematics, Institute of Science, Banaras Hindu University, Varanasi 221 005, India
      2. School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209, South Africa
    • Dates

       
  • Pramana – Journal of Physics | News

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