Modeling and analysis of heat transfer and fluid flow mechanisms in nanofluid filled enclosures irradiated from below

Radiation-driven transport mechanisms are ubiquitous in many natural flows and industrial processes. To mimic to better understand these processes, recently, radiatively heated nanofluid filled enclosures have been extensively researched. The present work is essentially a determining step quantifying understanding the involved such enclosures. In particular, two-dimensional square enclosure irradiated from bottom has investigated laminar flow situation. Effects of optical depth, inclination angle enclosure, incident flux, boundary conditions (adiabatic isothermal) investigated. Moreover, temperature fields carefully analyzed situation ranging “volumetric” “mixed” “surface” absorption modes. Under adiabatic conditions, steady state unconditionally achieved irrespective flux magnitude (varied between 5 W m-2 - 50 m-2), 0° 60°) mode (surface, mixed or volumetric). However, case isothermal boundaries; onset convection its transition into transient regime significantly impacted by angle.