Abstract
The aim of this paper is to observe the Nusselt number and friction factor behavior of the circular tube with conical strip inserts as turbulators in a laminar flow condition, using staggered and non-staggered conical strips with three different twist ratios (Y = 2, 3 and 5). The conical strip is inserted in the forward and backward direction individually compared to the flow of water which is the working fluid. The results indicate that the conical strip inserts increases the Nusselt number when compared to the plain surface tube. It is observed that the strip geometry has a major effect on the thermal performance of the circular tube. On examination of different strips for determining the enhancement of Nusselt number, the staggered conical strip with the twist ratio of Y = 3 has given a better result compared to the other two strips. Finally, correlations have been derived using regression analysis for predicting the Nusselt number and friction factor.
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Yakut K, Sahin B. Flow-induced vibration analysis of conical rings used for heat transfer enhancement in heat exchangers. Applied Energy, 2004, 78(3): 273–288
Promvonge P, Eiamsa-ard S. Heat transfer augmentation in a circular tube using V-nozzle turbulator inserts and snail entry. Experimental Thermal and Fluid Science, 2007, 32(1): 332–340
Bergles A E. Recent developments in convective heat transfer augmentation. Applied Mechanics Reviews, 1973, 26: 675–682
Bergles A E. Techniques to augment heat transfer. In: Rohsenow W M, Hartnett J P, Ganie E. eds. Handbook of Heat Transfer Application. New York: McGraw-Hill, 1985
Wang L, Sunden B. Performance comparison of some tube inserts. International Communications in Heat and Mass Transfer, 2002, 29 (1): 45–56
Liu S, Sakr M. A comprehensive review on passive heat transfer enhancements in pipe exchangers. Renewable & Sustainable Energy Reviews, 2013, 19: 64–81
Promvonge P. Heat transfer behaviors in round tube with conical ring inserts. Energy Conversion and Management, 2008, 49(1): 8–15
Sivashanmugam P, Suresh S. Experimental studies on heat transfer and friction factor characteristics of laminar flow through a circular tube fitted with regularly spaced helical screw-tape inserts. Experimental Thermal and Fluid Science, 2007, 31(4): 301–308
Sivashanmugam P, Suresh S. Experimental studies on heat transfer and friction factor characteristics of laminar flow through a circular tube fitted with helical screw-tape inserts. Applied Thermal Engineering, 2006, 26(16): 1990–1997
Sivashanmugam P, Suresh S. Experimental studies on heat transfer and friction factor characteristics of turbulent flow through a circular tube fitted with regularly spaced helical screw-tape inserts. Applied Thermal Engineering, 2007, 27(8-9): 1311–1319
Noothong W, Eiamsa-ard S, Promvonge P. Effect of twisted-tape inserts on heat transfer in a tube. In: The 2nd Joint International Conference on Sustainable Energy and Environment. Bangkok, Thailand. 2006, 21–23
García A, Solano J P, Vicente P G, Viedma A. Enhancement of laminar and transitional flow heat transfer in tubes by means of wire coil inserts. International Journal of Heat and Mass Transfer, 2007, 50(15-16): 3176–3189
Akhavan-Behabadi M A, Kumar R, Salimpour M R, Azimi R. Pressure drop and heat transfer augmentation due to coiled wire inserts during laminar flow of oil inside a horizontal tube. International Journal of Thermal Sciences, 2010, 49(2): 373–379
Tu W, Tang Y, Zhou B, Lu L. Experimental studies on heat transfer and friction factor characteristics of turbulent flow through a circular tube with small pipe inserts. International Communications in Heat and Mass Transfer, 2014, 56: 1–7
You Y, Fan A, Liu W, Huang S. Thermo-hydraulic characteristics of laminar flow in an enhanced tube with conical strip inserts. International Journal of Thermal Sciences, 2012, 61: 28–37
Pal S, Saha S K. Laminar fluid flow and heat transfer through a circular tube having spiralribs and twisted tapes. Experimental Thermal and Fluid Science, 2015, 60: 173–181
Gunes S, Ozceyhan V, Buyukalaca O. Heat transfer enhancement in a tube with equilateral triangle cross sectioned coiled wire inserts. Experimental Thermal and Fluid Science, 2010, 34(6): 684–691
Wongcharee K, Eiamsa-ard S. Friction and heat transfer characteristics of laminar swirl flow through the round tubes inserted with alternate clockwise and counter-clockwise twisted-tapes. International Communications in Heat and Mass Transfer, 2011, 38(3): 348–352
Anvari A R, Lotfi R, Rashidi A M, Sattari S. Experimental research on heat transfer of water in tubes with conical ring inserts in transient regime. International Communications in Heat and Mass Transfer, 2011, 38(5): 668–671
Yakut K, Sahin B. Flow-induced vibration analysis of conical rings used for heat transfer enhancement in heat exchangers. Applied Energy, 2004, 78(3): 273–288
Coleman H W, Steele W G. Experimental and uncertainty analysis for engineers. New York: Wiley, 1989
Chandrasekar M, Suresh S, Chandra Bose A. Experimental studies on heat transfer and friction factor characteristics of Al2O3/water nanofluid in a circular pipe under laminar flow with wire coil inserts. Experimental Thermal and Fluid Science, 2010, 34(2): 122–130
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Arulprakasajothi, M., Elangovan, K., Hema Chandra Reddy, K. et al. Experimental investigation on heat transfer effect of conical strip inserts in a circular tube under laminar flow. Front. Energy 10, 136–142 (2016). https://doi.org/10.1007/s11708-015-0389-z
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DOI: https://doi.org/10.1007/s11708-015-0389-z