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Received February 21, 2020
Accepted April 30, 2020
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Experimental study on thermo-hydraulic performance of nanofluids in diverse axial ratio elliptical tubes with a built-in turbulator
1Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipment, China University of Mining and Technology, Xuzhou 221116, China 2School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
qicong@cumt.edu.cn
Korean Journal of Chemical Engineering, September 2020, 37(9), 1466-1481(16), 10.1007/s11814-020-0566-6
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Abstract
Due to the low heat transfer efficiency of common heat exchange systems, an improved heat exchange system was developed. Enhanced tubes (elliptical tubes with a built-in turbulator) instead of a smooth tube were used and TiO2-water nanofluids were substituted for water to intensify the heat transfer. The influences of turbulator (presence or absence), axial ratios of elliptical tubes (Z=1.235, 1.471, 1.706), nanoparticle concentration (ω=0.0 wt%, 0.1 wt%, 0.3 wt%, 0.5wt%), and Reynolds number (Re=400-12,000) on the flow and heat transfer properties of TiO2-water nanofluids were studied. Thermal and exergy efficiency were used to research the comprehensive thermo-hydraulic characteristics of these heat transfer enhancement technologies. The thermo-hydraulic properties of nanofluids all showed an increasing trend with the growing axial ratio, nanoparticle concentration and Reynolds number. Nanofluids (ω=0.5 wt%) in an elliptical tube (Z=1.706) with a built-in turbulator showed the best thermal performance, which could be increased by 33.8% in comparison with water at best. The thermal efficiency index increased first and then decreased with the Re. Nanofluids in elliptical tubes with a built-in turbulator can clearly promote heat transfer under the identical condition.
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Samira P, Saeed ZH, Motahare S, Mostafa K, Korean J. Chem. Eng., 32(4), 609 (2015)
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Mohebbi R, Izadi M, Delouei AA, Sajjadi H, J. Therm. Anal. Calorim., 135, 3029 (2018)
Sun B, Yang AM, Yang D, Int. J. Heat Mass Transf., 107, 712 (2017)
Karimi A, Al-Rashed AA, Afrand M, Mahian O, Wongwises S, Shahsavar A, Int. J. Mech. Sci., 156, 397 (2019)
Naphon P, Wiriyasart S, Int. J. Heat Mass Transf., 118, 297 (2018)
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Qi C, Liu MN, Wang GQ, Pan YH, Liang L, Chin. J. Chem. Eng., 26(12), 2420 (2018)
Qi C, Yang L, Chen T, Rao Z, Appl. Therm. Eng., 129, 1315 (2018)
Pak BC, Cho YI, Exp. Heat. Transf., 11, 151 (1998)
Qi C, Wan YL, Li CY, Han DT, Rao ZH, Int. J. Heat Mass Transf., 115, 1072 (2017)
Qi C, Wang GQ, Yan YY, Mei SY, Luo T, Energy Conv. Manag., 166, 744 (2018)
Kline SJ, Mech. Eng., 75, 3 (1953)
Sieder EN, Tate GE, Ind. Eng. Chem., 28, 1429 (1936)
Gnielinski V, Int. Chem. Eng., 16, 359 (1976)
Qi C, Liang L, Rao ZH, Int. J. Heat Mass Transf., 94, 316 (2016)
