Heat Transfer and Frictional Characteristics in Rectangular Channel with Inclined Perforated Baffles

Authors: Se Kyung Oh, Ary Bachtiar Krishna Putra, Soo Whan Ahn

Abstract:

A numerical study on the turbulent flow and heat transfer characteristics in the rectangular channel with different types of baffles is carried out. The inclined baffles have the width of 19.8 cm, the square diamond type hole having one side length of 2.55 cm, and the inclination angle of 5o. Reynolds number is varied between 23,000 and 57,000. The SST turbulence model is applied in the calculation. The validity of the numerical results is examined by the experimental data. The numerical results of the flow field depict that the flow patterns around the different baffle type are entirely different and these significantly affect the local heat transfer characteristics. The heat transfer and friction factor characteristics are significantly affected by the perforation density of the baffle plate. It is found that the heat transfer enhancement of baffle type II (3 hole baffle) has the best values.

Keywords: Turbulent flow, rectangular channel, inclined baffle, heat transfer, friction factor.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1075623

References:

[1] Y. L. Tsay, T. S. Chang, J. C. Cheng, "Heat transfer enhancement of backward-facing step flow in a channel by using baffle installed on the channel wall", Acta Mech., 2005, Vol 174, pp. 63-76..
[2] C. Berner, F. Durst and D. M. McEligot, "Flow around baffles", ASME J. Heat Transfer, 1984, Vol. 106, pp. 743 -749.
[3] C. Berner, F. Durst and D. M. McEligot, "Streamwise-periodic flow around baffles", Proceeding of the 2nd Int. Conf. on Applications of Laser Anemometry to Fluid Mechanics, Lisbon, Portugal, 1984.
[4] M. A. Habib, A. M. Mobarak, M. A. Sallak, E. A. Abdel Hadi and R. L. Affify, "Experimental investigation of heat transfer and flow over baffles of different heights", ASME J. Heat Transfer, 1994, Vol. 116, No. 2, pp. 363-368.
[5] B. W. Webb, and S. Ramadhyani, "Conjugate heat transfer in a channel with staggered ribs", Int. J. Heat Mass Transfer, 1985, Vol. 28, pp. 1679-1687.
[6] K. M. Kelkar, and S. V. Patankar, "Numerical prediction of flow and heat transfer in parallel plate channel with staggered fins", Trans. ASME J. Heat Transfer, 1987, Vol. 109, pp. 25-30.
[7] M. A. Habib, A. E. Attya and D. M. McEligot, "Calculation of turbulent flow and heat transfer in channels with streamwise-periodic flow", Trans. ASME J. Turbomach., 1988, Vol. 110, pp. 405-411.
[8] P. Dutta and S. Dutta, "Effect of baffle size, perforation and orientation on internal heat transfer enhancement", Int. J. Heat Mass Transfer, 1998, Vol. 41, No. 19, pp. 3005-3013.
[9] Y. T. Yang and C. Z. Hwang, "Calculation of turbulent flow and heat transfer in a porous-baffled channel", Int. J. Heat Mass Transfer, 2003, Vol. 46, pp. 771-780.
[10] S. J. Kline and F. A. McClintock, "Describing uncertainty in single sample experiments", Mechanical Engineering, 1953, Vol. 75, pp. 3-8.
[11] D. C. Wilcox, Turbulent modelling for CFD. 2nd ed., DCW Industries. 1998.
[12] B. E. Launder and B. L. Sharma, "Application of the energy-dissipation model of turbulence to the calculation of flow near a spinning disc", Letters in Heat and Mass Transfer, 1974, Vol. 1, Issue 2, pp. 131-137.
[13] W. M. Kays and M. E. Crawford, "Convective heat and mass transfer", 2nd ed., McGraw-Hill, New York. 1990.
[14] S. H. Seyedein, M. Hasan, and A. S. Mujumdar, "Laminar flow and heat transfer from multiple impinging slot jets with an inclined confinement surface", Int. J. Heat and Mass Transfer, 1994, Vol. 37, pp. 1867-1875.