Heat Transfer Under Double Turbulent Pulsating Jets Impinging on A Flat Surface

In the present study the turbulent flow and heat transfer of double pulsating jets impinging on a flat surface were numerically analyzed. the unsteady two-dimensional numerical solutions for two similar and dissimilar jets was determined using the rng k-ε model. results showed that the rng k-ε model generates satisfactory predictions of nusselt number distribution. comparisons indicated that for two identical jets with a constant frequency and amplitude, an increasing reynolds number considerably increases the time-averaged nusselt number. the averaged nusselt number of the flat surface increases with rising oscillation amplitude. increasing the phase difference angle of the pulsating jets leads to an augmentation in mixing between jets, thereby increasing the nusselt number in this zone. for two jets of equal frequency and phase angle, increasing the oscillation amplitude of one jet leads to an asymmetric distribution of nusselt number. in this case, the nusselt number averaged between two jets increases. furthermore, the array of double jets with different types of oscillation (intermittent and sinusoidal) considerably increases the averaged nusselt number in the stagnation region between the jets.