Document Type : Research Paper


1 1Department of Biosystem Engineering, Ferdowsi University of Mashhad

2 Kashmar University

3 Ds & Research Group, Universitas Sumatera Utara, Medan, Indonesia


In this paper, the effect of boundary layer excitation on increasing the heat transfer coefficient of water/carbon nanotube (CNT) nanofluid and water/aluminum oxide (Al2O3) nanoparticles has been investigated. The turbulent flow equations inside the pipe with RNG K-ε turbulence model are solved employing fluent software. The results show that the use of water/CNT nanofluid significantly increases the heat transfer coefficient of convection. There is no such increase for water-aluminum oxide nanoparticles. If the volumetric percentage of carbon nanotube increases, the rate of increase in the heat transfer coefficient and the flow pressure drop will increase. Therefore, the use of water/CNT nanofluid with lower volumetric percentages is better for improving the convective heat transfer. Also, by placing the barrier on the inner wall of the tube and stimulating the boundary layer, the heat transfer coefficient and then thereafter increases in the excitement area. In the present study, the use of three obstacles behind each other has increased the average heat transfer coefficient by 16.7%.

Graphical Abstract

Study of the effect of the boundary layer excitation in the nanofluids flow inside the tube on increasing the heat transfer coefficient


Main Subjects

‎[1] K. Nishant  and S. S. Sonawans, “Experimental study of thermal conductivity and convective heat transfer enhancement using cuO and TiO2 nanoparticles”, Int. J.  Heat. Mass. Transf, Vol. 76, No. 1, pp. 98-107, (2016).

[2] M. Khoshvaght-Aliabadi, S. M. Hassani  and S. H. Mazloumi, “Comparison of hydrothermal performance between plate fins and plate-pin fins subject to nanofluid-cooled corrugated miniature heat sinks”, Mic. Reli, Vol. 70, No. 1, pp. 84-96, (2017).

[3] H. Chen, W. Yang, Y. He, Y. Ding, L.  Zhang, Ch. Tan, A.A. Lapkin and D.V. Bavykin, “Heat transfer and flow behaviour of aqueous suspensions of titanate nanotubes (nanofluids)”, Pow. Tech, Vol. 183, No. 1, pp. 63–72, (2008).

[4] K. B. Anoop, T. Sundararajan and S. K. Das, “Effect of particle size on the convective heat transfer in nanofluid in the developing region”, Int. J. Heat. Mass. Trans, Vol. 52, No. 9-10, pp. 2189–2195, (2009).

[5] K. S. Hwang, S. P. Jang and S. Choi, “Flow and convective heat transfer characteristics of water-based Al2O3 nanofluids in fully developed laminar flow regime”, Int. J. Heat. Mass. Trans, Vol. 52, No. 1-2, pp. 193–199,  (2009).

[6] W. C. Williams, J. Buongiorno and L. W. Hu, “Experimental investigation of turbulent convective heat transfer and pressure loss of alumina/water and zirconia/water nanoparticle colloids (nanofluids) in horizontal tubes”, ASME J. Heat. Trans, Vol. 130, No. 4, pp. 1-6, (2008).

[7] B. Farajollahi, S. Gh. Etemad and M. Hojjat, “Heat transfer of nanofluids in a shell and tube heat exchanger”, Int. J. Heat. Mass Trans, Vol. 53, No. 1-3, pp. 12–17, (2010).

[8] S. M. Fotukian and M. Nasr Esfahany, “Experimental investigation of turbulent convective heat transfer of dilute c-Al2O3/water nanofluid inside a circular tube”, Int. J. Heat. Fluid. Flow, In Press, Vol. 31, No. 4, pp. 606-612 (2010).

[9] W. Duangthongsuk and S.Wongwises, “Comparison of the effects of measured and computed thermophysical properties of nanofluids on heat transfer performance”, Ex. Ther. Flui. Sci, Vol. 34, No. 5, pp. 616–624, (2010).

[10] A. Akbarinia and A. Behzadmehr, “Numerical study of laminar mixed convection of a nanofluid in horizontal curved tubes”, Appl. Therm. Eng, Vol. 27, No. 8-9, pp. 1327–1337, (2007).

[11] M. Khoshvaght-Aliabadi, S. M. Hassani and S. H Mazloumi. “Comparison of hydrothermal performance between plate fins and plate-pin fins subject to nanofluid-cooled corrugated miniature heat sinks”, Mic. Reli, Vol. 70, No. 1, pp.84-96, (2017).

[12] P.K. Namburu, D. K. Das, K.M.Tanguturi and S. Vajjha, “Numerical study of turbulent flow and heat transfer characteristics of nanofluids considering variable properties”, Int. J. Ther. Sci, Vol. 48, No. 2, pp. 290–302, (2009).

[13] R. Lotfi, Y. Saboohi and A. M. Rashidi, “Numerical study of forced convective heat transfer of Nanofluids: Comparison of different approaches”, Int. Co. Heat. Mass Trans, Vol. 37, No. 1, pp. 74–78, (2010)

[14] P. Valipour, R. Moradi and F. Shaker Aski, “CNT-water nanofluid thermal radiation heat transfer over a stretching sheet considering heat generation”, J. Mol. li, Vol.  237, No. 1, pp. 242-246, (2017).

[15] A. S. Dogonchi and D. D. Ganji, “Impact of Cattaneo-Christov heat flux on MHD nanofluid flow and heat transfer between paraller plates considering thermal radiation effect”, J. Tai. Ins. Che. Eng, Vol. 80, No. 1, pp.52-63 (2017).

[16] D. Zhou, “Heat transfer enhancement of copper nanofluid with acoustic cavitation”,  Int. J.  Heat. Mass. Trans, Vol. 47, No. 14-16, pp.3109-3117,(2004).

[17] R. Saidur, K. Y. Leong and Ha Mohammad, “A review on applications and challenges of nanofluids”,Renew. Sus. Ener. reviews, Vol. 15, No. 3, pp. 1646-1668, (2011).

[18] K. Khanafer and  K. Vafai, “A critical synthesis of thermophysical characteristics of nanofluids”,  Int. J.  Heat. Mass. Trans, Vol. 54, No. 19-20, pp. 4410-4428, (2011).

[19] A. Akbar Rashidi and E. Kianpour, “Investigation of natural convection heat transfer of MHD hybrid nanofluid in a triangular enclosure,”  J. Comput. Appl. Res. Mech. Eng (JCARME), Vol. 10, No. 2 pp. 539-549. (2018).

[20] E. M. Hemmat, M. Akbari A. Karimipour, M. Afrand, Omid Mahian and Somchai Wongwises, “Mixed-convection flow and heat transfer in an inclined cavity equipped to a hot obstacle using nanofluids considering temperature-dependent properties”, Int. J. Heat. Mass Trans, Vol. 85, No. 1, pp. 656-666 (2015).

[21] A. Chamkha and E. Abu-Nada, “Mixed convection flow in single-and double-lid driven square cavities filled with water–Al2O3 nanofluid: Effect of viscosity models”, European J. Mech. B/Flui, Vol. 36, No. 1, pp. 82-96, (2012).

[22] T. Adibi, “Three-dimensional characteristic approach for incompressible thermo-flows and influence of artificial compressibility parameter”,  J. Comp. Appl. Re. Mech. Eng, (JCARME) Vol. 8, No. 2, pp. 223-234, (2019).

[23] S. Ahmadipour, M. H. Aghkhani and J. Zareei, “Investigation of injection timing and different fuels on the diesel engine performance and emissions”, J. Comput. Appl. Res. Mech Eng (JCARME), Vol. 9, No. 2, pp.385-396 (2019).

[24] M. M. Shahmardan, M. Norouzi and M. H. Sedaghat, “An Exact Analytical Solution for Convective Heat Transfer in Elliptical Pipes”,  AUT J. mech. eng, Vol. 1, No. 2, pp. 131-138 (2017).

[25] G. Musibau Sobamowo, “On Heat transfer analysis in pipe flow of Johnson-Segalman Fluid: Analytical Solution and Parametric Studies”, AUT J. mech. eng, Vol. 3, No. 2, pp.187-196(2018)

[26] G. Musibau Sobamowo, L. Jayesimi and A. Waheed, “Chebyshev Spectral Collocation Method for Flow and Heat Transfer in Magnetohydrodynamic Dissipative Carreau Nanofluid over a Stretching Sheet with Internal Heat Generation”,  AUT J. mech. eng, Vol. 3, No. 1, pp.3-14 (2019).

[27] I. Ch. Bang and G. Heo, “An axiomatic design approach in development of nanofluid coolants”,  Appl. Therm. Eng, Vol. 29, No. 1, pp. 75–90, (2009).

[28] E. Pfautsch, “Forced convection in nanofluids over a flat plate”,  Thesis, University of Missouri, (2008).

[29] L. Chen, H. Xie, Y. Li And W. Yu, “Nanofluids containing carbon nanotubes treated by mechanochemical reaction”, Therm. Acta, Vol. 477, No 1-2, pp. 21–24, (2008).

[30] S. Murshed, K. Leong and C. Yang, “Investigations of thermal conductivity and viscosity of nanofluids”, Int. J. Therm. Sci, Vol. 47, No. 5, pp. 560–568, (2008).

[31] H. S. Xue, J. R. Fan, R. H. Hong and Y. C. Hu, “Characteristic boiling curve of carbon nanotube nanofluid as determined by the transient calorimeter technique”, Appl. Phy.Let, Vol. 90, No. 18, pp. 184107, (2007).

[32] J. Zareei, A. Rohani  and W. Mohd,  “effect of ignition an injection timing along with hydrogen enrichment to natural gas in a direct injection engine on performance and exhaust emission”, Int. J. Auto. Eng,  Vol. 8, No. 1, pp. 2614-2632, (2018).

[33] A. Kakaee and J. Zareei,  “Influence of varying timing angle on performance of an SI engine: An experimental and numerical study”, J. Comp. Appl. Res. Mech. Eng (JCARME), Vol. 2, No. 2, pp. 33-43,  (2013).