Empirical correlation for performance evaluation of electric/corona wind on natural convection

• Effect of corona wind on behavior of natural convection was studied experimentally.
• Natural convection in vertical plate at different angle in presence of field and without field tested.
• The efficiency of the electric/corona wind at acute angles is higher than obtuse angles.
• Empirical correlation for the estimation of Nusselt number was achieved.

The effect of the corona wind on the natural convection at a rectangular channel was investigated experimentally. The results indicate that the natural convection in the absence of electric/corona wind at obtuse angles outperforms than acute angles and keeps improving by increasing the angle. However, the efficiency of the electric/corona wind at acute angles is higher than obtuse angles. Generally, in the presence of electric/corona wind, heat transfer coefficient was increased. The effect of the electric/corona wind was decreased by raising heat flux. This mainly stems from the fact that the temperature gradient raises the thermal boundary layer and reduces the secondary flow power. Eventually, empirical correlation for the estimation of Nusselt number was achieved.