Influence of rotating magnetic field on thermal field and entropy generation of a tube containing the nanofluid using mixture model

Abstract

The thermo-fluidic properties and entropy generation in a tube comprising nanofluid under variable rotational magnetic field have not been studied earlier. In the current study, the influence of a rotating magnetic field is evaluated by using mixture model at four different pump power for three cases. A steady-state, Newtonian Ag/water nanofluid, incompressible, and 3D model have been supposed. The influence of pump power variation and using nanofluid are studied. Results indicated that by raising the pump power for three cases, the Nusselt number enhances, and Bejan number, the friction factor, and dimensionless temperature decreases. The rotating magnetic field for the Case III in comparison to the Case Ⅰ and Case Ⅱ at 60 W and 0.5 % volume fraction of nanofluid, enhanced the Nusselt number by 356.3 % and 12.42 %, respectively. In the presence of 0.5 % nanofluid at 60 W pump power, the friction factor increases by 103.5 % compared to Case Ⅰ, with the same fluctuations observed in Cases Ⅱ and Ⅲ. The maximum dimensionless temperature reached 0.575 for Case Ⅲ at a power of 30 W using water. A rotating magnetic field of 60 W raised PEC by 219.44 % and 261.11 % for Cases Ⅱ and Ⅲ, respectively, compared to Case Ⅰ.