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Heat Transfer under Double Turbulent Pulsating Jets Impinging on a Flat Surface | ||
| Journal of Heat and Mass Transfer Research | ||
| مقاله 5، دوره 4، شماره 1 - شماره پیاپی 7، مرداد 2017، صفحه 45-52 اصل مقاله (627.11 K) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2017.1369.1093 | ||
| نویسندگان | ||
| Morteza Ataei1؛ Reza Tarighi1؛ Ali Hajimohammadi1؛ Mehran Rajabi zargarabadi* 2 | ||
| 1Semnan University | ||
| 2Faculty of Mechanical Engineering | ||
| تاریخ دریافت: 14 اردیبهشت 1395، تاریخ بازنگری: 16 فروردین 1396، تاریخ پذیرش: 20 فروردین 1396 | ||
| چکیده | ||
| In this study, the numerical analysis of turbulent flow and heat transfer of double pulsating impinging jets on a flat surface has been investigated. The unsteady two-dimensional numerical solution for two similar and dissimilar jets was performed using the RNG k-ε model. The results showed that the RNG k-ε model has more satisfactory predictions of the Nusselt number distribution. Comparisons show that for two identical jets with constant frequency and amplitude, increasing Reynolds number leads to the considerable increase of time-averaged Nusselt number. Also, with increasing oscillation amplitude, the averaged Nusselt number of surface increased. The results show that increasing the phase difference angle of pulsating jets leads to the increase of mixing between jets, which consequences the increase of Nusselt number in this zone. It should be mentioned that for two jets by equal frequency and phase angle, increasing oscillating amplitude of one jet leads to an asymmetric distribution of the Nusselt number. In this case, the averaged Nusselt number between two jets increased. Furthermore, the array of double jets with different oscillating type (intermittent and sinusoidal) leads to the increase of averaged Nusselt number considerably in the stagnation region between the jets. | ||
| کلیدواژهها | ||
| turbulent flow؛ Impingement Heat Transfer؛ Pulsating jet؛ Average Nusselt Number | ||
| مراجع | ||
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