Boundary layer analysis of an incessant moving needle in MHD radiative nanofluid with joule heating. (August 2017) - Sulochana, C.
Highlights: 2D magnetohydrodynamic flow of water and kerosene based nanofluids. Flow past a persistent moving horizontal needle is evaluated. Joule heating, non-uniform heat source/sink and dissipation effects are discussed. Heat transfer rate of Ag–kerosene is high when equated to Ag–water nanofluid. Abstract: The boundary layer analysis of a 2D forced convection flow along an incessant moving horizontal needle in magnetohydrodynamic radiative nanofluid is investigated. The energy equation is incorporated with the joule heating, non-constant heat source/sink, and viscid dissipation effects. To check the variation in the boundary layer nature, we considered the two nanofluids namely, Ag–water and Ag–Kerosene. The reduced system of governing PDEs is solved by employing the Runge–Kutta Fehlberg integration scheme. Computational results of the local Nusselt number and friction factor are tabulated and discussed. Velocity and temperature fields are discussed with the help of graphical illustrations. Increasing the needle size significantly reduces the flow and energy boundary layers of both nanofluids. In particular, thermal and velocity fields of Ag–kerosene nanofluids are highly dissed when equated with the Ag–water nanofluid. Graphical abstract: The steady, two dimensional MHD Newtonian nanofluid flow under the stagnation region of tinny needle is considered. Figure shows the cylindrical coordinate ( x, r )such that the x -axis is axial direction and r is normal to the x -axis and termed as radial direction and c is the magnitude of the needle. We examined the flow with the assistance of thermal stratification. We assume that the temperature of the cylindrical surface is much greater than the ambient fluid. Also, U 0 = uw + u ∞ be composite velocity along x -axis, where uw is the velocity of a needle and u ∞ is opposite of mainstream velocity.