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Water/TiO 2 nanofluid flow heat transfer and pressure drop through ducts with circular, square and rectangular cross-sections
Amir Dehshiri-Parizi, Mohammad Reza Salimpour
*Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran.
P.O.B. 84156-83111 Isfahan, Iran, [email protected]
A RTICLE I NFORMATION A BSTRACT
Original Research Paper Received 17 January 2015 Accepted 22 March 2015 Available Online 12 April 2015
Energy costs have soared rapidly in the last decades. Thus, there is tremendous need for new kinds of working fluids to improve the heating systems performances and to reduce energy consumption. One of the most applicable heating systems is heat exchangers. Study of thermal hydraulic characteristics for laminar fully developed flow through conduits with different cross- sections is significant in the design of heat exchangers. In the present investigation, the thermo- hydraulic behavior of nanofluid through conduits with circular, square and rectangular cross sectional shapes is studied, experimentally. This investigation aims to study the effect of Reynolds number and shape of cross-section on heat transfer and pressure drop of nanofluid flow. The experiments were conducted for TiO2/water nano luid with three volume fractions 0, 0.2 and 0.5 under laminar flow regime with constant wall temperature. Analyzed data indicate that friction factors of square and rectangular cases are more than that of circular cross section. Also, it is seen that the addition of nano powder with low volume fraction (0-0.5%) to base luids does not increase the friction factor remarkably at both circular and non-circular cases. The results show that the Nusselt number of flow through the conduit with circular cross-section is higher than that of non-circular cases. Moreover, it is observed that adding nano powder to base fluid improves heat transfer in sharp corners and therefore its effect is more pronounced in non-circular cross sections.
Keywords:
Heat Transfer Nanofluid
Different Cross-Sections Empirical
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[1] B. C. Pak, Y. I. Cho, Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles, Experimental HeatTransfer an International Journal Vol. 11, No. 2, pp. 151-170, 1998.
[2] D. Wen, Y. Ding, Experimental investigation into convective heat transferof nanofluids at the entrance region under laminar flow conditions, International Journal of Heat and Mass Transfer Vol. 47, No.
24, pp.5181-5188, 2004.
[3] K.S. Hwang, S.K.Jang, S.U.S.Chio, Flow and convective heat transfer characteristics of water-based Al2O3 nanofluids in fully developed laminar flow regime, Int. J. of Heat and Mass Transfer Vol. 52,pp. 193–
199, 2009.
[4] Q. Li, and Y. Xuan, Experimental investigation on transport properties of nanofluid, Heat Transfer Science and Technology 5th Beijing, China, Vol.
12, pp. 757-762, 2000
[5] S.M. Fotukian, and M. Nasr Esfahany, Experimental investigation of turbulent convective heat transfer of dilute Al2O3/water nanofluid inside circular tube, International Journal of Heat and Fluid Flow Vol. 31, pp.
606–612, 2010.
[6] S. Zeinali Heris, M. Nasr Esfahany, and S.Gh. Etemad, Experimental Investigation of Convective Heat Transfer of A1203/Water Nano luid in Circular Tube, Int. J. Heat Fluid Flow Vol. 28, pp. 203-210, 2007.
[7] S. Zeinali Heris, S.S.Gh. Etemad, M. Nasr Esfahany, Experimental investigation of oxide nanofluids laminar flow convective heat transfer, International Communications in Heat and Mass Transfer, Vol. 33, pp.
529-535, 2006.
[8] W. Yu, H. Xie, Y. Li, L. Chen, Q. Wang, Experimental investigation on the heat transfer properties of Al2O3 nanofluids using the mixture of ethylene glycol and water as base fluid, Powder Technology, Vol. 230, pp.
14-19, 2012.
[9] M. Nasiri, S.Gh. Etemad, R. Bagheri, Experimental heat transfer of nanofluid through an annular duct, International Communications in Heat and Mass Transfer, Vol. 38, pp. 958-963, 2011.
[10] T.H. Nassan, S. Zeinali Heris, S.H. Noie, comparison of experimental heat transfer characteristics for Al2O3/water and CuO/water nanofluids in square cross-section duct, International Communications in Heat and Mass Transfer, Vol. 37, pp. 924–928, 2010
[11] A. Einstein, Investigation on Theory of Brownian motion, rst ed. Dover, New York, 1956.
[12] J. C. Maxwell, treatise on electricity and magnetism 2nd Ed Clarendon Press, Oxford, UK, 1881.
[13] E.N. Seider, G.E. Tate, Heat transfer and pressure drop of liquid in tubes, Industrial Engineering Chemistry, Vol. 28 pp. 1429–1435, 1936.
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