Effect of pitch spring of delta-winglets on thermal characteristics in a heat exchanger tube
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Published:
Aug 7, 2018
Keywords:
Heat exchanger Enhancement Inserts Thermal performance Vortex generator
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Abstract
In this paper, the heat transfer, pressure loss and thermal performance by using delta-winglet pairs placed on double-sided straight tape inserted into a constant heat-fluxed tube are experimentally studied. Experimental work is conducted for the tape with different values of axial winglet pitch spacing (P) or winglet pitch ratio (P/D=PR= 0.5, 1.0, 1.5, 2.0 and 2.5). Air used as the working fluid and flows into the tube for Reynolds numbers (Re) ranging from 4100 to 25,400. The use of the delta-winglet tape (DWT) with the winglet attack angle of 45° is to generate two pairs of longitudinal vortex flows. The experimental results show that the DWT provides higher heat transfer rate and pressure loss than the smooth tube. The peak heat transfer rate is at PR=0.5 and is approximately 2.98–4.30 times above the smooth tube while the friction loss is around 10.01–36.34 times. To access the real benefits of the 45° DWT insert, thermal enhancement factor (TEF) is examined and found to be in the range of 1.22–1.55 for PR = 1.5.
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Koolnapadol, N., Sripattanapipat, S., & Skullong, S. (2018). Effect of pitch spring of delta-winglets on thermal characteristics in a heat exchanger tube. Journal of Research and Applications in Mechanical Engineering, 4(2), 166–174. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/138646
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RESEARCH ARTICLES
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References
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[3] Promvonge, P. Thermal performance in circular tube fitted with coiled square wires, Energy Convers. Manage., Vol. 49, 2008, pp. 980–987.
[4] Singh, V., Chamoli, S., Kumar, M., Kumar, A. Heat transfer and fluid flow characteristics of heat exchanger tube with multiple twisted tapes and solid rings inserts, Chem. Eng. Process. Process Intensif., Vol. 102, 2016, pp. 156–168.
[5] Eiamsa-ard, S., Kongkaitpaiboon, V., Nanan, K. Thermohydraulics of Turbulent Flow Through Heat Exchanger Tubes Fitted with Circular-rings and Twisted Tapes, Chin. J. Chem. Eng., Vol. 21, 2013, pp. 585–593.
[6] Yakut, K., Sahin, B. Flow-induced vibration analysis of conical rings used of heat transfer enhancement in heat exchanger. Appl. Energy, Vol. 78, 2004, pp. 273–288.
[7] Tandiroglu, A. Effect of flow geometry parameters on transient heat transfer for turbulent flow in a circular tube with baffle inserts, Int. J. Heat Mass Transfer, Vol. 49, 2006, pp. 1559–1567.
[8] Chokphoemphun, S., Pimsarn, M., Thianpong, C., Promvonge, P. Heat transfer augmentation in a circular tube with winglet vortex generators, Chin. J. Chem. Eng. Vol. 23, 2015, pp. 605–614.
[9] Wang, L., Sunden, B. Performance comparison of some tube inserts, Int. Commun. Heat Mass Transfer, Vol. 29, 2002, pp. 45–56.
[10] Eiamsa-ard, S., Thianpong, C., Promvonge, P. Experimental investigation of heat transfer and flow friction in a circular tube fitted with regularly spaced twisted tape elements, Int. Commun. Heat Mass Transfer, Vol. 33, 2006, pp. 1225–1233.
[11] Tamna, S., Kaewkohkiat, Y., Skullong, S., Promvonge, P. Heat transfer enhancement in tubular heat exchanger with double V-ribbed twisted-tapes, Case Stud. Therm. Eng. Vol. 7, 2016, pp. 14–24.
[12] Eiamsa-ard, S. and Promvonge, P. Experimental investigation of heat transfer and friction characteristics in a circular tube fitted with V-nozzle turbulators, Int. Commun. Heat Mass Transfer, Vol. 33, 2006, pp. 591–600.
[13] Promvonge, P. Heat transfer behaviors in round tube with conical ring inserts, Energy Convers. Manage., Vol. 49, 2008, pp. 8–15.
[14] Tandiroglu, A. Effect of flow geometry parameters on transient heat transfer for turbulent flow in a circular tube with baffle inserts, Int. J. Heat Mass Transfer, Vol. 49, 2006, pp. 1559–1569.
[15] Eiamsa-ard, S., Wongcharee, K., Eiamsa-ard, P., Thianpong, C. Thermohydraulic investigation of turbulent flow through a round tube equipped with twisted tapes consisting of centre wings and alternate-axes, Exp. Therm. Fluid Sci. Vol. 34, 2010, pp. 1151–1161.
[16] Wongcharee, K., Eiamsa-ard, S. Heat transfer enhancement by twisted tapes with alternate-axes and triangular, rectangular and trapezoidal wings, Chem. Eng. Process. Process Intensif., Vol. 50, 2011, pp. 211–219.
[17] Skullong, S., Promvonge, P., Thianpong, C., Pimsarn, M. Heat transfer and turbulent flow friction in a round tube with staggered-winglet perforated-tapes, Int. J. Heat Mass Transfer, Vol. 95, 2016, pp. 230–242.
[18] Incropera, F.P., Witt, P.D., Bergman, T.L., Lavine, A.S. Fundamentals of Heat and Mass Transfer, John-Wiley & Sons, 2006.
[19] Skullong, S., Promvonge, P., Jayranaiwachira, N., Thianpong, C. Experimental and numerical heat transfer investigation in a tubular heat exchanger with delta-wing tape inserts, Chem. Eng. Process. Process Intensif., Vol. 109, 2016, pp. 164–177.
[20] Prasopsuk, C., Hoonpong, P., Skullong, S., Promvonge, P. Experimental investigation of thermal performance enhancement in tubular heat exchanger fitted with rectangular-winglet-tape vortex generator, KKU ENGINEERING JOURNAL, Vol. 43(S2), 2016, pp. 279–282.
[21] Eiamsa-ard, S., 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.