Computational Fluid Dynamics Analysis of Impingement Heat Transfer in an Inline Array of Multiple Jets

Amid all convective heat transfer augmentation methods employing single phase, jet impingement heat transfer delivers significantly higher coefficient of local heat transfer. The arrangement leading to nine jets in square array has been used to cool a plate maintained at constant heat flux. Numerical study has been carried out using RANS-based turbulence modeling in commercial CFD Fluent software. The turbulent models used for the study are three different k-epsilon models (STD, RNG, and realizable) and SST k-omega model. The numerical simulation output is equated with the experimental results to find out the most accurate turbulence model. The impact of variation of Reynolds number, inter-jet spacing, and separation distance has been considered for the geometry considered. These parameters affect the coefficient of heat transfer, temperature, and turbulent kinetic energy related to flow. The local h values have been noticed to decline with the rise in separation distance H/D. The SST k-omega model has been noticed to be in maximum agreement with the experimental results. The average value of heat transfer coefficient h reduces from 210 to 193W/m(2)K with increase in H/D from 6 to 10 at Re=9000 and S/D of 3. As per numerical results, inter-jet spacing S/D of 3 has been determined to be the most optimum value.

Automated summary

Jet impingement heat transfer exhibits higher local heat transfer coefficient compared to other methods. Numerical simulations using different turbulence models were conducted to find the most accurate model, with SST k-omega model showing the best agreement with experimental results. The study determined the optimum inter-jet spacing under specific conditions.