Unsteady magnetohydrodynamic hybrid nanofluid flow over a rotating disk with viscous dissipation and Cattaneo–Christov heat flux model

Abstract

This work addresses unsteady MHD flow of hybrid nanofluids (MWCNTs−Fe3O4)/H2O over a rotating disk with viscous dispassion and the Cattaneo–Christov heat flux model. The boundary layer flow-directing PDEs were converted into systems of dimensionless coupled nonlinear ODEs using the similarity conversion technique. Using the spectral quasilinearization method (SQLM), the resulting nonlinear momentum and energy equations were then numerically solved along with their boundary conditions. For the preparation of (MWCNTs−Fe3O4)/H2O hybrid nanofluid with shape factor n1=n2=3, it is specified that 5% of MWCNTs, 20% of Fe3O4, and 75% of H2O be taken. Using graphs and tables, the effects of more noticeable parameters on the thermal flow fields and velocity were thoroughly investigated. The results show that as the value of the unsteady parameter increased, the momentum and thermal boundary layer thickness decreased. The local heat transfer rate improves by nearly 20% as 0.2 volume of Fe3O4 nanoparticles dispersed in 0.1 volume of MWCNTs and 0.7 volume of H2O nanofluid. The finding of this study is noteworthy because it indicates that the (MWCNTs−Fe3O4)/H2O hybrid nanofluids exhibit superior flow distributions and good thermal property stability when compared to their mono counterparts.