Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30855
Thermal Performance Analysis of Nanofluids in a Concetric Heat Exchanger Equipped with Turbulators

Authors: Bayram Sahin, Kadir Gelis, Murat Ceylan, Eyüphan Manay, Feyza Eda Akyurek


Turbulent forced convection heat transfer and pressure drop characteristics of Al2O3–water nanofluid flowing through a concentric tube heat exchanger with and without coiled wire turbulators were studied experimentally. The experiments were conducted in the Reynolds number ranging from 4000 to 20000, particle volume concentrations of 0.8 vol.% and 1.6 vol.%. Two turbulators with the pitches of 25 mm and 39 mm were used. The results of nanofluids indicated that average Nusselt number increased much more with increasing Reynolds number compared to that of pure water. Thermal conductivity enhancement by the nanofluids resulted in heat transfer enhancement. Once the pressure drop of the alumina/water nanofluid was analyzed, it was nearly equal to that of pure water at the same Reynolds number range. It was concluded that nanofluids with the volume fractions of 0.8 and 1.6 did not have a significant effect on pressure drop change. However, the use of wire coils in heat exchanger enhanced heat transfer as well as the pressure drop.

Keywords: Heat Transfer Enhancement, Nanofluids, heat exchanger, turbulators

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1108


[1] Wang, Q.X. and Mujumdar, A.S. ‘’A Review on Nanofluids-Part I: Theoretical and Numerical Investigations’’ Brasilian Journal of Chemical Engineering, vol. 25, 2008, pp. 613-630.
[2] E. Manay, B. Sahin, K. Gelis, M. Yilmaz, ‘’Thermal performance analysis of nanofluids in microchannel heat sinks,’’ World Academy of Science, Engineering and Technology, vol. 67, 2012, pp. 100-105.
[3] S.Z. Heris, M.N. Esfahany, S.Gh. Etemad, Experimental investigation of convective heat transfer of Al2O3/water nanofluid in a circular tube, Int. J. Heat Fluid Flow 28 (2007) 203–210.
[4] D. Wen, Y. Ding, Experimental investigation into convective heat transfer of nanofluids at the entrance region under laminar flow conditions, Int. J. Heat Mass Transfer 47 (24) (a.2004) 5181–5188.
[5] S.Z. Heris, S.Gh. Etemad, M.N. Esfahany, Experimental investigation of oxide nanofluids laminar flow convective heat transfer, Int. Commun. Heat Mass Transfer 33 (4) (2006) 529–535.
[6] Y. Ding, H. Alias, D. Wen, R.A. Williams, Heat transfer of aqueous suspensions of carbon nanotubes (CNT nanofluids), Int. J. Heat Mass Transfer 49 (1–2) (2006) 240–250.
[7] Y. Yang, Z.G. Zhang, E.A. Grulke, W.B. Anderson, G. Wu, Heat transfer properties of nanoparticle-in-fluid dispersions (nanofluids) in laminar flow, Int. J. Heat Mass Transfer 48 (6) (2005) 1107–1116.
[8] E. Manay, B. Sahin, ‘’The effect of microchannel height on performance of nanofluids,’’ International Journal of Heat and Mass Transfer, vol. 95, 2016, pp. 307-320.
[9] E. Manay, B. Sahin, ‘’Heat transfer and pressure drop of nanofluids in a microchannel heat sink,’’ Heat Transfer Engineering, 2016.
[10] W. Duangthongsuk, S. Wongwises, ‘’Heat transfer enhancement and pressure drop characteristics of TiO2-water nanofluid in a double-tube counter flow heat exchanger,’’ International Journal of Heat and Mass Transfer, vol. 52, 2009, pp. 2059-2067.
[11] W. Duangthongsuk, S. Wongwises, ‘’An experimental study on the heat transfer performance and pressure drop of TiO2-water nanofluids flowing under a turbulent flow regime,’’ International Journal of Heat and Mass Transfer, vol. 53, 2010, pp. 334-344.
[12] M.H. Kayhani, H. Soltanzadeh, M.M. Heyhat, M. Nazari, F. Kowsary, ‘’Experimental study of convective heat transfer and pressure drop of TiO2/water nanofluid,’’ International Communications in Heat and Mass Transfer, vol. 39, 2012, pp. 456–462
[13] B.C. Pak, Y.I. Cho, ‘’Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles,’’ Exp. Heat Trans., vol. 11, 1998, pp. 151-170
[14] Y. He, Y. Jin, H. Chen, Y. Ding, D. Cang, H. Lu, ‘’Heat transfer and flow behaviour of aqueous suspensions of TiO2 nanoparticles (nanofluids) flowing upward through a vertical pipe,’’ Int. J. Heat Mass Trans., vol. 50, 2007, pp. 2272-2281.
[15] A.A. Arani, J. Amani, ‘’Experimental study on the effect of TiO2–water nanofluid on heat transfer and pressure drop,’’ Experimental Thermal and Fluid Science, vol. 42, 2012, pp. 107-115.
[16] B. Farajollahi, S. Etemad, M. Hojjat, ‘’Heat transfer of nanofluids in a shell and tube heat exchanger,’’ Int. J. Heat Mass Trans., vol. 53, 2010, pp. 12-17.
[17] B. Sahin, E. Manay, E.F. Akyurek, ‘’An Experimental Study on Heat Transfer and Pressure Drop of CuO-Water Nanofluid,’’ Journal of Nanomaterials, vol. 10, 2015.
[18] B. Sahin, G. Gültekin, E. Manay, S. Karagoz, ‘’Experimental investigation of heat transfer and pressure drop characteristics of Al2O3–water nanofluid,’’ Experimental Thermal and Fluid Science, vol. 50, 2013, pp. 21-28.
[19] Y. Xuan, W. Roetzel, ‘’Conceptions for heat transfer correlation of nanofluids,’’ Int. J. Heat Mass Transfer, vol. 43, 2000, pp. 3701.
[20] V. Gnielinski, Int. Chem. Eng., 16, 1976, 359.
[21] S.J. Kline, F.A. McClintock, ‘’Describing uncertainties in single-sample experiment,’’ Mech. Eng., vol.75 (1), 1953, pp. 3–8.
[22] H. Blasius, Grenzschichten in Flussig Keitenmit Kleiner Reibung, 2. Math. Phys., 56, 1908, 1-37.
[23] V. Petukhov, V. Kirillov, ‘’To the question of heat transfer in turbulent pipe flow of liquids in tubes,’’ Teploenergetika, vol. 4(4), 1958, pp. 63-68.
[24] F. W. Dittus, L.M.K. Boelter, Univ. Calif. (Berkeley) Pub., Eng., 2, 1930, 443.
[25] F.P. Incropera, D.P. DeWitt, Fundamentals of Heat and Mass Transfer, John Wiley Son & Sons Inc., 4th edition, 2001.