Natural convection heat transfer in partially open inclined square cavities.

*(English)*Zbl 1189.76516Summary: A numerical study has been carried out on inclined partially open square cavities, which are formed by adiabatic walls and a partial opening. The surface of the wall inside the cavity facing the partial opening is isothermal. Steady-state heat transfer by laminar natural convection in a two dimensional partially open cavity is studied by numerically solving equations of mass, momentum and energy. Streamlines and isotherms are produced, heat and mass transfer is calculated. A parametric study is carried out using following parameters: Rayleigh number from \(10^{3}\) to \(10^{6}\), dimensionless aperture size from 0.25 to 0.75, aperture position at high, center and low, and inclination of the opening from \(0^{\circ }\) (facing upward) to \(120^\circ \) (facing \(30^{\circ }\) downward). It is found that the volume flow rate and Nusselt number are an increasing function of Rayleigh number, aperture size and generally aperture position. Other parameters being constant, Nusselt number is a non-linear function of the inclination angle. Depending on the application, heat transfer can be maximized or minimized by selecting appropriate parameters, namely aperture size, aperture position and inclination angle at a given operation Rayleigh number.