Experimental investigation of heat transfer and pressure drop in perforated ribs in the solar air heater channel

Document Type : Research Article

Authors

1 Mechanical Engineering Department K. N. Toosi University of Technology

2 mechanical Engineering Department K. N. Toosi University of Technology

3 Mechanical Engineering Department K. N. Toosi university of Technology

Abstract

In the present study, heat transfer and pressure drop inside the square channel are investigated experimentally with perforated ribs. The Reynolds range was between 15000 and 50,000. The ratio of ribs height to channel hydraulic diameter was 0.1 and 0.13 and ribs pitch to height ratio was 20, 25, and 30, respectively. The ratio of hole diameter to rib height was 0.3 and 0.5, respectively. The results obtained from the experimental setup developed in the laboratory compared with the results of previous studies, which confirmed the accuracy of the experimental results. The results show that the use of ribs in the channel surfaces results in a significant improvement in the heat transfer rate in the canal as well as an increase in the pressure drop. The perforated ribs resulted in less pressure drop, however, the Nusselt decreased. As well The effect of perforation on the indentation was more evident in the smaller pitch ratio. The results show that in applications where there is a need to lower the wall temperature or increase the heat transfer and the blower energy consumption is less important, using holes in the ribs, the performance of the relevant system such as gas turbine or heaters can be improved.

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References

[1] J. HAN, J. PARK, C. LEI, Heat transfer enhancement in channels with turbulence promoters, Journal of engineering for gas turbines and power, 107(3) (1985) 628-635.
[2] D. Jin, M. Zhang, P. Wang, S. Xu, Numerical investigation of heat transfer and fluid flow in a solar air heater duct with multi V-shaped ribs on the absorber plate, Energy, 89 (2015) 178-190.
[3] T.-M. LIOU, J.-J. HWANG, Turbulent heat transfer augmentation and friction in periodic fully developed channel flows, Journal of heat transfer, 114(1) (1992) 56-64.
[4] G. Tanda, Effect of rib spacing on heat transfer and friction in a rectangular channel with 45° angled rib turbulators on one/two walls, International Journal of Heat and Mass Transfer, 54(5) (2011) 1081-1090.
[5] S.-W. Chang, T.M. Liou, W.C. Juan, Influence of channel height on heat transfer augmentation in rectangular channels with two opposite rib-roughened walls, International Journal of Heat and Mass Transfer, 48(13) (2005) 2806-2813.
[6] T. Desrues, P. Marty, J.F. Fourmigué, Numerical prediction of heat transfer and pressure drop in three-dimensional channels with alternated opposed ribs, Applied Thermal Engineering, 45-46 (2012) 52-63.
[7] P. Sriromreun, C. Thianpong, P. Promvonge, Experimental and numerical study on heat transfer enhancement in a channel with Z-shaped baffles, International Communications in Heat and Mass Transfer, 39(7) (2012) 945-952.
[8] G. Xie, J. Liu, W. Zhang, G. Lorenzini, C. Biserni, Numerical prediction of turbulent flow and heat transfer enhancement in a square passage with various truncated ribs on one wall, Journal of heat transfer, 136(1) (2014).
[9] P.R. Chandra, M.L. Fontenot, J.-C. Han, Effect of rib profiles on turbulent channel flow heat transfer, Journal of thermophysics and heat transfer, 12(1) (1998) 116-118.
[10] M. Ansari, M. Bazargan, Optimization of flat plate solar air heaters with ribbed surfaces, Applied Thermal Engineering, 136 (2018) 356-363.
[11] M. Ansari, M. Bazargan, Optimization of flat plate solar air heaters with ribbed surfaces, Amirkabir Journal of Mechanical Engineering, 49(1) (2017) 137-146.
[12] F.P. Incropera, A.S. Lavine, T.L. Bergman, D.P. DeWitt, Fundamentals of heat and mass transfer, Wiley, 2007.
[13] S. Patankar, C. Liu, E.M. Sparrow, Fully developed flow and heat transfer in ducts having streamwise-periodic variations of cross-sectional area, Journal of Heat Transfer, 99(2) (1977) 180-186.
[14] J. HAN, Heat transfer and friction characteristics in rectangular channels with rib turbulators, Journal of heat transfer, 110(2) (1988) 321-328.
 
Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 3 (Special Issue)
June 2021
Pages 1981-2000

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