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Articles by Ioan Pop
Total Records ( 3 ) for Ioan Pop
  Mohamad Mustaqim Junoh , Fadzilah Md Ali and Ioan Pop
  The problem of the steady two dimensional stagnation-point flow of an incompressible electrically conducting nanofluid caused by a stretching/shrinking surface is studied. The effect of an induced magnetic field is taken into account. The nonlinear partial differential equations are transformed into nonlinear ordinary differential equations via. similarity transformations. The transformed governing equations are solved numerically using the shooting method which built-in function in Maple Software. The effects of governing parameters on the skin friction coefficient, the local Nusselt number, the local sherwood number and the velocity, temperature and concentration profiles are also presented in this study. It is found that dual solutions exist for the shrinking case. Therefore, a stability analysis is performed to verify which solution is stable and it is found that the first solution is physically stable while the second solution is unstable.
  Ezad H. Hafidzuddin , Roslinda Nazar , Norihan Md. Arifin and Ioan Pop
  This study deals with the boundary layer flow and heat transfer near the stagnation point on a permeable stretching/shrinking surface in a nanofluid. The nanoparticles considered in this study are copper and silver. The governing nonlinear partial differential equations are transformed into a system of nonlinear ordinary differential equations using an appropriate similarity transformation which then solved numerically to study the effect of solid volume fraction or nanoparticle volume fraction parameter Φ of the nanofluid. Multiple solutions are found for a certain range of shrinking and suction parameters, therefore, a stability analysis is performed to determine which solution is stable and physically realizable. The effects of the governing parameters on the skin friction coefficient, the local Nusselt number and the velocity and temperature profiles were presented and discussed. It was found that the nanoparticle volume fraction substantially affects the fluid flow and heat transfer characteristics.
  Anuar Ishak , Khamisah Jafar , Roslinda Nazar and Ioan Pop
 

The steady two-dimensional MHD stagnation point flow towards a stretching sheet with variable surface temperature is investigated. The governing system of partial differential equations are transformed into ordinary differential equations, which are then solved numerically using a finite-difference scheme known as the Keller-box method. The effects of the governing parameters on the flow field and heat transfer characteristics are obtained and discussed. It is found that the heat transfer rate at the surface increases with the magnetic parameter when the free stream velocity exceeds the stretching velocity, i.e. ε>1, and the opposite is observed when ε<1.

 
 
 
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