%0 Journal Article
%T Effect of alternating magnetic field on unsteady MHD mixed convection and entropy generation of ferro fluid in a linearly heated two-sided cavity
%J Scientia Iranica
%I Sharif University of Technology
%Z 1026-3098
%A Ghaffarpasand, O.
%D 2017
%\ 06/01/2017
%V 24
%N 3
%P 1108-1125
%! Effect of alternating magnetic field on unsteady MHD mixed convection and entropy generation of ferro fluid in a linearly heated two-sided cavity
%K MHD mixed convection
%K Ferro fluid
%K Two-sided cavity
%K Linearly heating
%K Time-periodic magnetic field
%R 10.24200/sci.2017.4093
%X This work considers the numerical study of unsteady MHD convection of cobalt-kerosene ferro fluid in a linearly heated two-sided cavity and in the presence of constant and alternating magnetic elds. An accurate nite volume method is adapted to solve the governing equations for this problem. The fluid flow and heat transfercharacteristics are studied for a wide range of Richardson numbers (0:01 Ri 10) and Hartmann numbers (0 Ha 100). The volumetric fraction of nanoscale ferromagnetic particles in ferro fluid also varies between 0:0 0:2, while the size of those nanoparticles is fixed at 45 nm. In addition, different alternating magnetic fields with various periods and phase deviations are utilized to study the effect of time-periodic magnetic field on the flow characteristics and heat transfer. The entropy generation and Bejan number are also evaluated to study the eect of key parameters and temporal variation of magnetic field on various fluid irreversibilities. The results show that applying time-periodic magnetic field has remarkably influenced the fluid characteristics, the fluid irreversibilities, and heat transfer within the cavity. Meanwhile, the influence of phase deviation on heat transfer seems to be insignicant.
%U https://scientiairanica.sharif.edu/article_4093_a6b5d9bd363897e6e2838136fe628de1.pdf