Investigation of flow and heat transfer characteristics of impinging slot jets confined with inclined plates

ÖZMEN Y., Kinay H.

Heat and Mass Transfer/Waerme- und Stoffuebertragung, vol.59, no.3, pp.509-534, 2023 (SCI-Expanded) identifier identifier


© 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.In this study, flow and heat transfer characteristics were investigated experimentally and numerically in the slot jet flow that confined with inclined plates and impinging a flat surface. In the experimental part of the work, surface pressures were measured on the impingement and confinement plates for the θ = 15°, 30° and 45° values of confinement plate inclination angle and for the values of the spacing between plates in the range of 0.5 ≤ H/W ≤ 6 at the Reynolds numbers in the range of 10,000–30,000. The effects of Reynolds number, confinement plate inclination angle and spacing between plates on pressure distributions were determined. It was seen that while pressure distributions are independent of Reynols number, they have been affected from confinement plate inclination angle and spacing between plates. Secondary peaks appear in the pressure distributions on the impingement plate when the spacing between plates becomes smaller. In the numerical part of the work, the effects of confinement plate inclination angle (θ = 15°, 30° and 45°) and spacing between plates (0.5 ≤ H/W ≤ 6) on both flow structure and heat transfer were investigated with two dimensional solutions for the Reynolds number of 20,000. The Kato Launder modification of the Standard k-ε and Standard k-ω turbulence models were used in the solutions and the calculated flow fields and pressure and heat transfer distributions were obtained. When the spacing between plates and inclination angle of confinement plate become smaller, secondary peaks are formed in the Nusselt distributions on the impingement plate. Nusslet numbers at the ends of the impingement plate have increased for H/W ≤ 1 due to the presence of inclined confinement plates. The Standard k-ε turbulence model predicts the results closer to the experimental data.