Numerical simulation of magnetic nanofluid (MNF) film boiling using the VOSET method in presence of a uniform magnetic field

Abstract A two-dimensional numerical model for solving the problem of incompressible two-phase boiling of a magnetic nanofluid (MNF) in presence of a magnetic field was established by the VOSET (the coupled VOF and a level set method) interface tracking method including a phase change effect. The present work was focused on analyses of the bubble growth and heat transfer characteristics in saturated film boiling at various volume concentrations, magnetic field intensities and magnetic susceptibilities. Under the condition of low volume concentration, the evaluation of the phase interface was mildly influenced, and the heat transfer performance of MNF film boiling was slightly enhanced with an increase in the volume concentration. Discrete bubble growth occurred and the heat transfer characteristics of MNF film boiling were only slightly affected at a lower magnetic field intensity or magnetic susceptibility. In contrast, vapour columns formed and a significant heat transfer enhancement was achieved at a higher magnetic field intensity or magnetic susceptibility.