Thermal performance augmentation in heat exchanger tube with oval–pentagon rings
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Published:
Jul 25, 2018
Keywords:
Thermal performance vortex ring flow behavior heat tranfer Reynolds number
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Abstract
The paper presents an experimental and numerical investigation on thermal performance in a uniform wall heat-fluxed tube inserted with 45º inclined oval–pentagon rings (OPR) for turbulent flow region using air as the working fluid. The ring parameters included three blockage ratios (RB=e/D=0.05, 0.10 and 0.15) and four pitch ratios (RP=P/D=1.0, 1.25, 1.5 and 2.0) are introduced. The results from the inserted tube are compared with those from smooth tube alone and show that the OPR can augment the heat transfer rate and friction loss around 2.25–4.86 and 14–100 times over the smooth tube, respectively, depending upon operating conditions. The maximum thermal enhancement factor for using OPR tabulators at about 1.36 is for Re=3900, RB=0.05 and RP=1.0. It is worth noting that the results of numerical study are in good agreement with the experimental ones. The average deviation of both results is within ±7% for Nusselt number and ±10% for friction factor.
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Chingtuaythong, W., & Chokphoemphun, S. (2018). Thermal performance augmentation in heat exchanger tube with oval–pentagon rings. Journal of Research and Applications in Mechanical Engineering, 6(1), 50–62. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/136552
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RESEARCH ARTICLES
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References
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[2] Chang, S.W., Yang, T.L. and Liou, J.S. Heat transfer and pressure drop in tube with broken twisted tape insert, Exp. Therm. Fluid Sci., Vol. 32, 2007, pp. 489-501.
[3] Eiamsa-ard, S. and Promvonge, P. Enhancement of heat transfer in a tube with regularly-spaced helical tape swirl generators, Sol. Energy, Vol. 78, 2005, pp. 483-494.
[4] Keklikcioglu, O. and Ozceyhan, V. Experimental investigation on heat transfer enhancement in a circular tube with equilateral triangle cross sectioned coiled-wire inserts, Appl. Therm. Eng., Vol. 131, 2018, pp. 686-695.
[5] Chang, S.W., Jing Yan Gao, J.Y. and Shih H.L. Thermal performances of turbulent tubular flows enhanced by ribbed and grooved wire coils, Int. J. Heat Mass Transfer, Vol. 90, 2015, pp. 1109-1124.
[6] Promvonge, P. Thermal performance in circular tube fitted with coiled square wires, Energy Convers. Manage., Vol. 49, 2008, pp. 980-987.
[7] Chokphoemphun, S., Pimsarn, M., Thianpong, C. and Promvonge, P. Heat transfer augmentation in a circular tube with winglet vortex generators, Chin. J. Chem. Eng. Vol. 23, 2015, pp. 605-614.
[8] Eiamsa-ard, S. and Promvonge, P. Influence of double-sided delta-wing tape insert with alternate-axes on flow and heat transfer characteristics in a heat exchanger tube, Chin. J. Chem. Eng. Vol. 19(3), 2011, pp. 410-423.
[9] Promvonge, P., Tamna, S., Pimsarn, M. and Thianpong, C. Thermal characterization in a circular tube fitted with inclined horseshoe baffles, Appl. Therm. Eng., Vol. 75, 2015, pp. 1147-1155.
[10] Ozceyhan, V., Gunes, S., Buyukalaca, O. and Altuntop, N., Heat transfer enhancement in a tube using circular cross sectional rings separated from wall. Appl. Energ., Vol. 85, 2008, pp. 988-1001.
[11] Chingtuaythong, W., Promvonge, P., Thianpong, C. and Pimsarn, M. Heat transfer characterization in a tubular heat exchanger with V-shaped rings, Appl. Therm. Eng., Vol. 110, 2017, pp. 1164-1171.
[12] Kumar, A., Sunil Chamoli, S. and Kumar, M. Experimental investigation on thermal performance and fluid flow characteristics in heat exchanger tube with solid hollow circular disk inserts, Appl. Therm. Eng., Vol. 100, 2016, pp. 227-236.
[13] Sheikholeslami, M., Gorji-Bandpy, M. and Ganji, D.D. Experimental study on turbulent flow and heat transfer in an air to water heat exchanger using perforated circular-ring, Exp. Therm. Fluid Sci., Vol. 70, 2016, pp. 185-195.
[14] Ruengpayungsak, K., Wongcharee, K., Thianpong, C., Pimsarn, M., Chuwattanakul, V. and Eiamsa-ard, S. Heat transfer evaluation of turbulent flows through gear-ring elements, Appl. Therm. Eng., Vol. 123, 2017, pp. 991-1005.
[15] Bartwal, A., Gautam, A., Kumar, M., Mangrulkar, C.K. and Chamoli, S. Thermal performance intensification of a circular heat exchanger tube integrated with compound circular ring–metal wire net inserts, Chem. Eng. Process., Vol. 124, 2018, pp. 50-70.
[16] Xu, Y., Islam, M.D. and Kharoua, N. Experimental study of thermal performance and flow behaviour with winglet vortex generators in a circular tube, Appl. Therm. Eng., Vol. 135, 2018, pp. 257-268.
[17] Promvonge, P., Koolnapadol, N., Pimsarn, M. and Thianpong, C. Thermal performance enhancement in a heat exchanger tube fitted with inclined vortex rings, Appl. Therm. Eng., Vol. 62, 2014, pp. 285-292.
[18] Acir, A., Ismail Ata, I. and Canli, M.E. Investigation of effect of the circular ring turbulators on heat transfer augmentation and fluid flow characteristic of solar air heater, Exp. Therm. Fluid Sci., Vol. 77, 2016, pp. 45-54.
[19] ASME. Standard measurement of fluid flow in pipes using orifice, nozzle and venture, ASME MFC–3M-1984, 1984, ASME, New York.
[20] Patankar, S.V., Liu, C.H. and Sparrow, E.M. Fully developed flow and heat transfer in ducts having streamwise-periodic variations of cross-sectional area, ASME J. Heat Transf., Vol. 98, 1998, pp. 1109-1151.
[21] Incropera, F.P., Witt, P.D., Bergman, T.L. and Lavine, A.S. Fundamentals of heat and mass transfer, 2006, John-Wiley & Sons, New York.
[22] Cengel, Y.A. and Ghajar, A.J. Heat transfer and mass transfer fundamentals & applications, 2015, McGraw–Hill Education, New York.