Experimental Investigation of the Effect of Curvature Ratio on Heat Transfer in Double Pipe Helical Heat Exchanger
Different parameters of double pipe helical coil were investigation experimentally. Four coils were used; three with a curvature ratio (0.037, 0.031, and 0.028) and 11mm diameter of the inner tube while the fourth with 0.033 curvature ratio and 13 mm diameter of the inner tube. The hot water flow in the inner tube whereas the cold water flows in the annulus. The inlet temperatures of hot and cold water are 50 0C and 18 0C respectively. The inner mass flow rate ranges from 0.0167 to 0.0583 kg/s. The results show the Nusselt number increase with increase curvature ratio. The Nusselt number of the coil with 0.037 curvature ratio increases by approximately 12.3 % as compare with 0.028 curvature ratio. The results also reveal that the Nusselt number of the coil with curvature ratio 0.033 increases by approximately 11.6 % as compare with 0.028 curvature ratio for 400 mm coil diameter.
S.A. Berger, L. Talbot, L.S. Yao, Flow in curved pipes Annual Review of Fluid Mechanics 15 (1983) 461–512.
D.G. Prabhanjan, G.S.V. Raghavan, T.J. Rennie, comparison of heat transfer rates between a straight tube heat exchanger and a helically coiled heat exchanger International Communications in, Heat and mass Transfer 29 (2) (2002) 185-191,
Y.I.Kim, S.H.Kim, Y.D.Hwang, J.H. Park, Numerical investigation on the similarity of developing laminar flows in helical pipes,Nucl.Eng.Des.241(12) (2011) 5211-5224.
M.T. Jamal-Abad, A. Zamzamian, M. Dehghan, Experimental studies on the heat transfer and pressure drop characteristics of Cu-water and Al-water nanfluid in a spiral coil, Experimantal Thermal and Fluid Science 47 (2013) 206- 212.
V.Kubair,N.R. Kuloor, Flow of Newtonian fluids in Archimedean spiral tube coil correlation of the laminar,transition and turbulent flows, Indian J. Technol.4 (1969) 3-8.
V.Kubair, N.R. Kuloor, Heat transfer to Newtonian fluid in coiled pipe in laminar flow, Int. J. Heat Mass Transfer 9 (1966) 63-75.
T.J.Rennie, Numerical and experimental studies of a double pipe helical heat exchanger, Ph.D. dissertation, McGill University, Montreal, Canada, (2004)
T.J.Rennie, V.G.S.Raghavan, Experimental studies of a double-pipe helical heat exchanger, Experimental Thermal and Fluid Science 29 (2005) 919-924.
V.Kumar, S.Saini, M.Sharma, K.D.P.Nigam, Pressure drop and heat transfer study in tube-in-tube helical heat exchanger, Chemical EngineeringScience61 (2006) 4403-4416.
N.Ghorbani, H.Taherian, M.Gorji, H.Mirgolbabaei, An experimental study of thermal performance of shell-and-coil heat exchangers, Int. Comm in Heat and Mass Transfer 37 (2010) 775–781.
M. Moawed, Experimental study of forced convection from helical coiled tubes with different parameters, Energy Conversion and Management 52 (2011)1150–1156
J.S.Jayakumar, S.M. Mahajani, J.C.Mandal, K.N.Iyer, P.K.Vijayan, CFDanalysis of single-phase flows inside helically coiled tubes, Computers and Chemical Eng. 34 (2010)430–446.
Y.M.Ferng, W.C.Lin, C.C.Chieng, Numerically investigated effects of different Dean number and pitch size on flow and heat transfer characteristics in a helically coil-tube heat exchanger, Applied Thermal Engineering 36 (2012) 378-385.
H.A. Mohammed, K. Narrein, Thermal and hydraulic characteristics of nanofluid flow in a helically coiled tube heat exchanger, International Communications in Heat and Mass Transfer 39 (2012) 1375–1383
M.A. Akhavan-Behabadi, M.F. Pakdaman, M. Ghazvini, Experimental investigation on the convection heat transfer of nanofluid flow inside vertical helically coild tubes under uniform wall temperature condition, International Communications in Heat and Mass Transfer 39 (2012) 556-564.
S.S. Pawar , V. K. Sunnapwar, Experimental studies on heat transfer to Newtonian and non-Newtonian fluids in helical coils with laminar and turbulent flow Experimental Thermal and Fluid Science 44 (2013) 792–804
F.M. White, Heat Transfer, Addison Wesley Publishing Company Inc., New York, NY, 1984.
Seban, R.A., Mclauchlin E.F. (1962), "Heat transfer in tube coils with laminar and turbulent flow", Heat mass transfer 6, 387-395
A.N. Dravid, K.A. Smith, E.W. Merrill, P.L.T. Brian, "Effect of secondary fluid motion on laminar flow heat transfer in helically coiled tubes, American Institute of Chemical Engineers Journal 17 (5) 1971 1114-1112.
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