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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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[1]. D. A. Zumbrunnen, M. Balasubramanian, “Convective heat transfer enhancement due to gas injection into an impinging liquid jet”, Journal of Heat Transfer, 117 (4) (1995) 1011–1017.
[2]. D. J. Sailor, D. J. Rohli, Q. L. Fu, “Effect of variable duty cycle flow pulsations on heat transfer enhancement for an impinging air jet”, International Journal of Heat and Fluid Flow, 20 (6) (1999) 574–580.
[3]. H. S. Sheriff, D. A. Zumbrunnen, “Effect of flow pulsations on the cooling effective- ness of an impinging jet”, Journal of Heat Transfer, 116 (4) (1994) 886–895.
[4]. D. A. Zumbrunnen, M. Aziz, “Convective heat transfer enhancement due to intermittency in an impinging jet”, Journal of Heat Transfer, 115 (1) (1993) 91–98.
[5]. D. A. Zumbrunnen, M. Balasubramanian, “Convective heat transfer enhancement due to gas injection into an impinging liquid jet”, Journal of Heat Transfer, 117 (4) (1995) 1011–1017.
[6]. S. Marzouk, “Numerical study of momentum and heat transfer in a pulsed plane laminar jet”, International Journal of Heat and Mass Transfer, 46 (22) (2003) 4319–4334.
[7]. Hee Joo Poh, Kurichi Kumar, A. S. Mujumdar, “Heat transfer from a pulsed laminar impinging jet”, International Communications in Heat and Mass Transfer, 32 (10) (2005) 1317–1324.
[8]. Kamaruzzaman Sopian, “Comparison of Local Nusselt Number between Steady and Pulsating Jet at Different Jet Reynolds Number”, WSEAS TRANSACTIONS on ENVIRONMENT and DEVELOPMENT, 5 (5) (2009) 384- 393.
[9]. Rozli Zulkifli, “Comparison of Local Nusselt Number for Steady and Pulsating Circular Jet at Reynolds Number of 16000” , European Journal of Scientific Research ISSN 1450-216X, 29 (3) (2009) 369-378.
[10]. Peng Xu, “Turbulent impinging jet heat transfer enhancement due to intermittent pulsation”, International Journal of Thermal Sciences, 49 (7) (2010) 1247-1252.
[11]. Peng Xu, Shuxia Qiu, Mingzhou Yu, Xianwu Qiao, A. S. Mujumdar “A study on the heat and mass transfer properties of multiple pulsating impinging jets”, International Communications in Heat and Mass Transfer, 39 (3) (2012) 378–382.
[12]. P. Xu, A.S. Mujumdar, H.J. Poh, B.M. Yu, “ Heat transfer under a pulsed slot turbulent impinging jet at large temperature differences”, Thermal Science, 14 (1) (2010) 271–281.
[13]. P. Xu, B. M. Yu, S. X. Qiu, H. J. Poh, A.S. Mujumdar, “Turbulent impinging jet heat transfer enhancement due to intermittent pulsation”, International Journal of Thermal Science, 49 (7) (2010) 1247–1252.
[14]. J. W. Zhou, Y. G. Wang, G. Middelberg, H. Herwig, “Unsteady jet impingement: heat transfer on smooth and non-smooth surfaces”, International Communications in Heat and Mass Transfer, 36 (2) (2009) 103–110.
[15]. Javad. Mohammadpour, Mohammad mehdi Zolfagharian, A. S.Mujumdar, Mehran Rajabi Zargarabadi “Heat transfer under composite arrangement of pulsed and steady turbulent submerged multiple jets impinging on a flat surface” International Journal of Thermal Sciences, 86 (2014) 139-147.
[16]. Javad Mohammadpour, Mehran Rajabi Zargarabadi, A. S.Mujumdar, Hadi Ahmadi “ Effect of intermittent and sinusoidal pulsed flows on impingement heat transfer from a concave surface” International Journal of Thermal Sciences, 76 (2014) 118-127.
[17]. V. Yakhot, S. A. Orszga, S. Thangam, C. G. Speziale, “Development of turbulence models for shear flows by a double expansion technique”, Fluid Dynamic, 4 (7) (1992).
[18]. E. C. Mladin, D. A. Zumbrunnen, “Alterations to coherent flow structures and heat transfer due to pulsations in an impinging air-jet”, International Journal of Thermal Science, 39 (2) (2000) 236–248.
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