SINGLE-PHASE MODELING OF NANOFLUID JET IMPINGEMENT HEAT TRANSFER

In the present research work, we investigated the heat transfer characteristics of single free jet impingement using air and water with/without aluminum oxide (Al2O3) nanoparticles. Numerical simulations were performed for a two-dimensional axisymmetric incompressible flow using the shear stress transport k-omega turbulent model and enhanced wall function. Validation was done by comparing the average Nusselt number values with the existing experimental data for a single-phase (air only) jet as well as a water jet with Al2O3 nanoparticles. The heat transfer performance was calculated for different Reynolds numbers and nanoparticle volume fractions. Al2O3 nanoparticles (40 nm in size) were used for the nanofluid (NF). It was found that heat transfer from the plate was enhanced significantly by the use of nanoparticles with air, which was not observed in the water-based NF for volume fractions ranging from 0.5% to 2% when using the single-phase NF model. In addition, two-phase NF modeling was more accurate and satisfactorily explained the physical behavior in comparison with single-phase NF modeling.