Thermohydraulics of Turbulent Flow Through Heat Exchanger Tubes Fitted with Circular-rings and Twisted Tapes

doi:10.1016/S1004-9541(13)60504-2

摘要/Abstract

摘要： The influences of circular-ring turbulators (CRT) and twisted tape (TT) swirl generators on the heat transfer enhancement, pressure drop and thermal performance factor characteristics in a round tube are reported. The circular-ring turbulators were individually employed and together with the twisted tape swirl generators in the heated section of the tube. Three different pitch ratios (l/D1.0, 1.5, and 2.0) of the CRT and three different twist ratios (y/W 3, 4, and 5) of the TT were introduced. The experiments were conducted using air as the working fluid under a uniform wall heat flux condition, for the Reynolds number between 6000 and 20000. The experimental results reveal that the heat transfer rate, friction factor and thermal performance factor of the combined CRT and TT are considerably higher than those of CRT alone. For the range examined, the increases of mean Nusselt number, friction factor and thermal performance, in the tube equipped with combined devices, respectively, are 25.8%, 82.8% and 6.3% over those in the tube with the CRT alone. The highest thermal performance factor of 1.42 is found for the combined device consisting of the CRT with l/D 1.0 and TT with y/W 3. The correlations of the Nusselt number, friction factor and thermal performance factor of the tubes with combined devices are also developed in terms of Reynolds number, Prandtl number, twist ratio and pitch ratio.

关键词: heat transfer enhancement, circular-ring, twisted tape, swirl generator, turbulator, heat exchanger

Abstract: The influences of circular-ring turbulators (CRT) and twisted tape (TT) swirl generators on the heat transfer enhancement, pressure drop and thermal performance factor characteristics in a round tube are reported. The circular-ring turbulators were individually employed and together with the twisted tape swirl generators in the heated section of the tube. Three different pitch ratios (l/D1.0, 1.5, and 2.0) of the CRT and three different twist ratios (y/W 3, 4, and 5) of the TT were introduced. The experiments were conducted using air as the working fluid under a uniform wall heat flux condition, for the Reynolds number between 6000 and 20000. The experimental results reveal that the heat transfer rate, friction factor and thermal performance factor of the combined CRT and TT are considerably higher than those of CRT alone. For the range examined, the increases of mean Nusselt number, friction factor and thermal performance, in the tube equipped with combined devices, respectively, are 25.8%, 82.8% and 6.3% over those in the tube with the CRT alone. The highest thermal performance factor of 1.42 is found for the combined device consisting of the CRT with l/D 1.0 and TT with y/W 3. The correlations of the Nusselt number, friction factor and thermal performance factor of the tubes with combined devices are also developed in terms of Reynolds number, Prandtl number, twist ratio and pitch ratio.

Key words: heat transfer enhancement, circular-ring, twisted tape, swirl generator, turbulator, heat exchanger

Smith Eiamsa-ard, Vichan Kongkaitpaiboon, Kwanchai Nanan. Thermohydraulics of Turbulent Flow Through Heat Exchanger Tubes Fitted with Circular-rings and Twisted Tapes[J]. Chinese Journal of Chemical Engineering, DOI: 10.1016/S1004-9541(13)60504-2.

参考文献

1 Eiamsa-ard, S., Promvonge, P., “Experimental investigation of heat transfer and friction characteristics in a circular tube fitted with V-nozzle turbulators”, Int. Comm. Heat Mass Transfer, 33, 591-600 (2006).

2 Promvonge, P., Eiamsa-ard, S., “Heat transfer and turbulent flow friction in a circular tube fitted with conical-nozzle turbulators”, Int. Comm. Heat Mass Transfer, 34, 72-82 (2007).

3 Yakut, K., Sahin, B., Canbazoglu, S., “Performance and flow-induced vibration characteristics for conical-ring turbulators”, Appl. Energy, 79, 65-76 (2004).

4 Yakut, K., Sahin, B., “Flow-induced vibration analysis of conical rings used of heat transfer enhancement in heat exchanger”, Appl. Energy, 78, 273-288 (2004).

5 Promvonge, P. “Heat transfer behaviors in round tube with conical ring inserts”, Energy Conver. Manag., 49, 8-15 (2008).

6 Eiamsa-ard, S., Promvonge, P., “Thermal characterization of turbulent tube flows over diamond-shaped elements in tandem”, Int. J. Therm. Sci., 49, 1051-1062 (2010).

7 Kongkaitpaiboon, V., Nanan, K., Eiamsa-ard, S., “Experimental investigation of convective heat transfer and pressure loss in a round tube fitted with circular-ring turbulators”, Int. Comm. Heat Mass Transfer, 37, 568-574 (2010).

8 Kongkaitpaiboon, V., Nanan, K., Eiamsa-ard, S., “Experimental investigation of heat transfer and turbulent flow friction in a tube fitted with perforated conical-rings”, Int. Comm. Heat Mass Transfer, 37, 560-567 (2010).

9 Durmus, A., “Heat transfer and exergy loss in cut out conical turbulators”, Energy Conver. Manag., 45, 785-796 (2004).

10 Kiml, R., Mochizuki, S., Murata, A., Stoica, V., “Effects of rib-induced secondary flow on heat transfer augmentation inside a circular tube”, J. Enhanced Heat Transfer, 10, 9-20 (2003).

11 Kiml, R., Magda, A., Mochizuki, S., Murata, A., “Rib-induced secondary flow effects on local circumferential heat transfer distribution inside a circular rib-roughened tube”, Int. J. Heat Mass Transfer, 47, 1403-1412 (2004).

12 Jaisankar, S., Radhakrishnan, T.K., Sheeba, K.N., Suresh, S., “Experimental investigation of heat transfer and friction factor characteristics of thermosyphon solar water heater system fitted with spacer at the trailing edge of left-right twisted tapes”, Energy Conver. Manag., 50, 2638-2649 (2009).

13 Liao, Q., Xin, M.D., “Augmentation of convective heat transfer inside tubes with three-dimensional internal extended surfaces and twisted-tape inserts”, Chem. Eng. J., 78, 95-105 (2000).

14 Zimparov, V., “Enhancement of heat transfer by a combination of three-start spirally corrugated tubes with a twisted tape”, Int. J. Heat Mass Transfer, 44, 551-574 (2001).

15 Zimparov, V., “Enhancement of heat transfer by a combination of a single-start spirally corrugated tubes with a twisted tape”, Exp. Therm. Fluid Sci., 25, 535-546 (2002).

16 Hong, M.N., Deng, X.H., Huang, K., Li, Z.W., “Compound heat transfer enhancement of a converging-diverging tube with evenly spaced twisted-tapes”, Chin. J. Chem. Eng., 15, 814-820 (2007).

17 Pramanik, D., Saha, S.K., “Thermohydraulics of laminar flow through rectangular and square ducts with transverse ribs and twisted tapes”, Int. J. Heat Transfer Trans., 128, 1070-1080 (2006).

18 Bharadwaj, P., Khondge, A.D., Date, A.W., “Heat transfer and pressure drop in a spirally grooved tube with twisted tape insert”, Int. J. Heat Mass Transfer, 52, 1938-1944 (2009).

19 Al-Fahed, S., Chamra, L.M., Chakroun, W., “Pressure drop and heat transfer comparison for both microfin tube and twisted-tape inserts in laminar flow”, Exp. Therm. Fluid Sci., 18, 323-333 (1998).

20 Thianpong, C., Eiamsa-ard, P., Wongcharee, K., Eiamsa-ard, S., “Compound heat transfer enhancement of a dimpled tube with a twisted tape swirl generator”, Int. Comm. Heat Mass Transfer, 36, 698-704 (2009).

21 Promvonge, P., Eiamsa-ard, S., “Heat transfer behaviors in a tube with combined conical-ring and twisted-tape insert”, Int. Comm. Heat and Mass Transfer, 34, 849-859 (2007).

22 Promvonge, P., “Thermal augmentation in circular tube with twisted tape and wire coil turbulators”, Energy Conver. Manag., 49, 2949-2955 (2008).

23 Eiamsa-ard, S., Nivesrangsan, P., Chokphoemphun S., Promvonge, P., “Influence of combined non-uniform wire coil and twisted tape inserts on thermal performance characteristics”, Int. Comm, Heat Mass Transfer, 34, 849-859 (2010).

24 Pal, P.K., Saha, S.K., “Thermal and friction characteristics of laminar flow through square and rectangular ducts with transverse ribs and twisted tapes with and without oblique teeth”, J. Enhanced Heat Transfer, 17, 1-21 (2010).

25 Zhang, Y.M., Azad, G.M., Han, J.C., Lee, C.P., “Turbulent heat transfer enhancement and surface heating effect in square channels with wavy, and twisted tape inserts with interrupted ribs”, J. Enhanced Heat Transfer, 7, 5-49 (2000).

26 Murugesan, P., Mayilsamy, K., Suresh, S., “Heat transfer and friction factor studies in a circular tube fitted with twisted tape consisting of wire-nails”, Chin. J. Chem. Eng., 18, 1038-1042 (2010).

27 Japanese Industrial Standard, “Measurement of Fluid Flow by Means of Orifice Plates, Nozzles and Venturi Tubes”, Japanese Standards Association, Japan, JIS Z 8762-1988 (1988).

28 ANSI/ASME, “Measurement Uncertainty”, PTC 19, 1-1985. Part I (1986).

29 Webb, R.L., Kim N.H., Principles of Enhanced Heat Transfer, 2nd edition, Taylor& Francis Group, New York (2005).

[1]	Siwen Gu, Lei Zhang, Yu Zhuang, Weida Li, Jian Du, Cheng Shao. Two-tier control structure design methodology applied to heat exchanger networks[J]. 中国化学工程学报, 2022, 47(7): 231-244.
[2]	Feng Jiang, Di Xu, Ruijia Li, Guopeng Qi, Xiulun Li. Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator[J]. 中国化学工程学报, 2022, 46(6): 40-52.
[3]	Mehdi Miansari, Mehdi Rajabtabar Darvishi, Davood Toghraie, Pouya Barnoon, Mojtaba Shirzad, As'ad Alizadeh. Numerical investigation of grooves effects on the thermal performance of helically grooved shell and coil tube heat exchanger[J]. 中国化学工程学报, 2022, 44(4): 424-434.
[4]	Le Li, Yansheng Zhao, Wenhao Lian, Chun Han, Qian Zhang, Wei Huang. Review on the effect of heat exchanger tubes on flow behavior and heat/mass transfer of the bubble/slurry reactors[J]. 中国化学工程学报, 2021, 35(7): 44-61.
[5]	Chuanshuai Dong, Lin Lu, Tao Wen, Shaojie Zhang. Thermal performance assessment of self-rotating twisted tapes and Al₂O₃ nanoparticle in a circular pipe[J]. 中国化学工程学报, 2021, 32(4): 77-86.
[6]	Krunal M. Gangawane, Hakan F. Oztop. Mixed convection in the heated semi-circular lid-driven cavity for nonNewtonian power-law fluids: Effect of presence and shape of the block[J]. 中国化学工程学报, 2020, 28(5): 1225-1240.
[7]	Yu Zhuang, Rui Yang, Lei Zhang, Jian Du, Shengqiang Shen. Simultaneous synthesis of sub and above-ambient heat exchanger networks including expansion process based on an enhanced superstructure model[J]. 中国化学工程学报, 2020, 28(5): 1344-1356.
[8]	Pongjet Promvonge, Sompol Skullong. Enhanced heat transfer in rectangular duct with punched winglets[J]. 中国化学工程学报, 2020, 28(3): 660-671.
[9]	P. Soleimani, M. Khoshvaght-Aliabadi, H. Rashidi, H. Bahmanpour. Performance enhancement of water bath heater at natural gas city gate station using twisted tubes[J]. 中国化学工程学报, 2020, 28(1): 165-179.
[10]	Siwen Gu, Linlin Liu, Lei Zhang, Yiyuan Bai, Shaojing Wang, Jian Du. Heat exchanger network synthesis integrated with flexibility and controllability[J]. 中国化学工程学报, 2019, 27(7): 1474-1484.
[11]	Lixia Kang, Yongzhong Liu. Synthesis of flexible heat exchanger networks: A review[J]. 中国化学工程学报, 2019, 27(7): 1485-1497.
[12]	Yaping Chen, Hongling Tang, Jiafeng Wu, Huaduo Gu, Shifan Yang. Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones[J]. 中国化学工程学报, 2019, 27(12): 2892-2899.
[13]	Wenke Zheng, Weihua Cai, Yiqiang Jiang. Distribution performance of gas-liquid mixture in the shell side of spiral-wound heat exchangers[J]. 中国化学工程学报, 2019, 27(10): 2284-2292.
[14]	Surasit Tanthadiloke, Paisan Kittisupakorn, Pannee Boriboonsri, Iqbal M. Mujtaba. Devise of a W serpentine shape tube heat exchanger in a hard chromium electroplating process[J]. Chinese Journal of Chemical Engineering, 2019, 27(1): 218-225.
[15]	Li Xia, Yuanli Feng, Xiaoyan Sun, Shuguang Xiang. Design of heat exchanger network based on entransy theory[J]. Chinese Journal of Chemical Engineering, 2018, 26(8): 1692-1699.