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SETSCI - Volume 3 (2018)
ISAS2018-Winter - 2nd International Symposium on Innovative Approaches in Scientific Studies, Samsun, Turkey, Nov 30, 2018

Thermal Characteristics of Swirling Coaxial Confined Impinging Air Jets: An Experimental Investigation
Burak Markal1*
1Recep Tayyip Erdogan University , Rize, Turkey
* Corresponding author:
Published Date: 2019-01-14   |   Page (s): 66-71   |    346     19

ABSTRACT The present study investigates the heat transfer characteristics of swirling coaxial confined impinging turbulent air
jets. Experimental range covers different values of dimensionless nozzle-to-plate distance (H / D = 0.5, 1 and 2) and
dimensionless flowrate ratio (Q* = 0.2 and 0.5). The total flowrate is kept constant at 1.16 x 10-3 m3 s-1 (70 L/min) during the
tests. The results are also compared to those obtained for the conventional single circular jets (Q* = 0). It is concluded that
both the intensity and the radial uniformity of the heat transfer are improved by increasing dimensionless flowrate ratio. On the
other hand, increasing nozzle-to-plate distance causes a decrement in the magnitude of Nusselt numbers.  
KEYWORDS Impingement, swirling jet, coaxial, heat transfer, radial uniformity
REFERENCES [1] D. W. Colucci, and R. Viskanta, “Effect of nozzle geometry on local convective heat transfer to a confined impinging air jet,” Exp. Therm
Fluid Sci., vol. 13, pp. 71−80, 1996.
[2] X. Gao, and B. Sunden, “Experimental investigation of the heat transfer characteristics of confined impinging slot jets,” Exp. Heat
Transf., 16, pp. 1–18, 2003.
[3] M. F. Koseoglu, and S. Baskaya, “The effect of flow field and turbulence on heat transfer characteristics of confined circular and
elliptic impinging jets,” Int. J. Therm Sci., vol. 47, pp. 1332–1346, 2008.
[4] S. Eiamsa-ard, K. Nanan, and K. Wongcharee, “Heat transfer visualization of co/counter-dual swirling impinging jets by thermochromic liquid crystal method,” Int. J. Heat Mass Transf., vol. 86, pp. 600–621, 2015.
[5] H. Maki, and A. Yabe, “Heat transfer by the annular impinging jet, Exp. Heat Transf., vol. 2:1, pp. 1−12, 1989.
[6] L. Huang, and M. S. EL-Genk, “Heat transfer and flow visualization experiments of swirling, multi-channel, and conventional impinging jets,” Int. J. Heat Mass Transf., vol. 41, pp. 583–600, 1998.
[7] M. Can, and A. B. Etemoglu, “Investigation into methods of enhancing heat transfer under impinging air jets,” Exp. Heat Transf., vol. 16:3, pp. 171−190, 2003.
[8] C. Nuntadusit, M. Wae-hayee, A. Bunyajitradulya, and S. Eiamsa-ard, “Visualization of flow and heat transfer characteristics for swirling impinging jet,” Int. Commun. Heat Mass Transf., vol. 39, pp. 640– 648, 2012.
[9] M. Wae-Hayee, P. Tekasakul, S. Eiamsa-ard, and C. Nuntadusit, “Flow and heat transfer characteristics of in-line impinging jets with cross-flow at short jet-to-plate distance, Exp. Heat Transf., vol. 28:6, pp. 511−530, 2015.
[10] Z. U. Ahmed, Y. M. Al-Abdeli, and F. G. Guzzomi, “Heat transfer characteristics of swirling and non-swirling impinging turbulent jets,” Int. J. Heat Mass Transf., vol. 102, pp. 991–1003, 2016.
[11] Z. U. Ahmed, Y. M. Al-Abdeli, and F. G. Guzzomi, “Flow field and thermal behaviour in swirling and non-swirling turbulent impinging jets,” Int. J. Therm. Sci., vol. 114, pp. 241–256, 2017.
[12] B. Markal, “Experimental investigation of heat transfer characteristics and wall pressure distribution of swirling coaxial confined impinging air jets,” Int. J. Heat Mass Transf., vol. 124, pp. 517–532, 2018.
[13] B. Markal, and O. Aydin, “Experimental investigation of coaxial impinging air jets,” Appl. Therm. Eng., vol. 141, pp. 1120–1130, 2018.
[14] S. J. Kline, and F. A. McClintock, “Describing uncertainties in single sample experiments,” Mech. Eng., vol. 75 (1), pp. 3–8, 1953.
[15] Y. Ozmen, “Confined impinging twin air jets at high Reynolds numbers,” Exp. Therm Fluid Sci., vol. 35, pp. 355–363, 2011.

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