Numerical investigation of jet impingement cooling an isothermal surface using extended jet holes with various binary hybrid nanofluids

In the current study, we conducted a numerical analysis of jet impingement for cooling a flat plate subject to constant temperature using numerous binary hybrid nanofluids. In other words, we studied the effect of combining two types of nanoparticles (Al2O3 and MgO) have different forms, where the form of Al2O3 nanoparticles is spherical, and the form of MgO nanoparticles we change every time to the following nanoparticles: spherical, brick, blades, cylindrical and platelet. The analyses were carried under a turbulent forced convection flow condition (5000 ≤  Re  ≤ 15000), the overall volume fraction of nanoparticles is in the range 0 %  ≤ φhnf ≤ 5% and the dimensionless extended jet holes (α = h/Dj) varies from 0 to 4. The validation of the outcomes has demonstrated a strong consensus between the results presented and several published findings. Findings revealed that the highest values of Re and φhnf greatly lead to an increase in heat transfer rate and pressure drop of the system. A significant enhancement in the heat transfer rate was obtained when using the configurations of nanoparticles Al2O3 and MgO with the forms spherical and platelet, respectively. Adding extended jet holes greatly boosts the heat transfer rate compared to the non-extended jet hole.