Comment on the paper "Network and Nakamura tridiagonal computational simulation of electrically-conducting biopolymer micro-morphic transport phenomena O. Anwar Bég, J. Zueco, M. Norouzi, M. Davoodi, A. A. Joneidi, Assma F. Elsayed, Computers in Biology and Medicine 44 (2014) 44-56"
The present comment concerns some doubtful results included in the above paper.
Network and Nakamura tridiagonal computational simulation of electrically-conducting biopolymer micro-morphic transport phenomena
Magnetic fields have been shown to achieve excellent fabrication control and manipulation of conductive bio-polymer characteristics. To simulate magnetohydrodynamic effects on non-Newtonian electro-conductive bio-polymers (ECBPs) we present herein a theoretical and numerical simulation of free convection magneto-micropolar biopolymer flow over a horizontal circular cylinder (an "enrobing" problem). Eringen's robust micropolar model (a special case of the more general micro-morphic or "microfluid" model) is implemented. The transformed partial differential conservation equations are solved numerically with a powerful and new code based on NSM (Network Simulation Method) i.e. PSPICE. An extensive range of Hartmann numbers, Grashof numbers, micropolar parameters and Prandtl numbers are considered. Excellent validation is also achieved with earlier non-magnetic studies. Furthermore the present PSPICE code is also benchmarked with an implicit tridiagonal solver based on Nakamura's method (BIONAK) again achieving close correlation. The study highlights the excellent potential of both numerical methods described in simulating nonlinear biopolymer micro-structural flows.
Magnetic field effect on a moving vertical cylinder with constant heat flux
Abstract.An analysis is performed to study the unsteady incompressible flow over a moving vertical cylinder with constant heat flux and magnetic field applied normal to the surface. The nonlinear-coupled parabolic partial differential equations governing the flow and heat transfer have been solved numerically using a finite difference scheme of Crank-Nicolson type. The numerical results are presented for the velocity, temperature, local and average skin-friction and Nusselt number. It is observed that the presence as well as increase in the magnetic field leads to decrease in the velocity field and rise in thermal boundary thickness.