Experimental Investigation of Convective Heat Transfer and Pressure Drop of Al2O3/Water Nanofluid in Laminar Flow Regime inside a Circular Tube

In the present study, Convective heat transfer coefficient and pressure drop of Al2O3/water nanofluid in laminar flow regime under constant heat flux conditions inside a circular tube were experimentally investigated. Al2O3/water nanofluid with 0.5% and 1% volume concentrations with 15 nm diameter nanoparticles were used as working fluid. The effect of different volume concentrations on convective heat transfer coefficient and friction factor was studied. The results emphasize that increasing of particle volume concentration leads to enhance convective heat transfer coefficient. Measurements show the average heat transfer coefficient enhanced about 11-20% with 0.5% volume concentration and increased about 16-27% with 1% volume concentration compared to distilled water. In addition, the convective heat transfer coefficient of nanofluid enhances with increase in heat flux. From the results, the average ratio of (fnf/fbf) was about 1.10 for 0.5% volume concentration. Therefore, there is no significant increase in friction factor for nanofluids.

Authors:

• H. Almohammadi
• Sh. Nasiri Vatan
• E. Esmaeilzadeh
• A. Motezaker
• A. Nokhosteen

Keywords:

• Convective heat transfer
• Laminar flow regime
• Nanofluids
• Pressure drop

References:

[1] A.S. Ahuja, Augmentation of heat transport in laminar flow of
polystyrene suspension: experiments and results, Journal of Applied
Physics 46 (1975) 3408-3416.
[2] S.U.S. Choi, Enhancing thermal conductivity of fluids with
nanoparticle, ASME FED 231 (1995) 99.
[3] Hwang, K.S., Jang, S.P., Choi, S.U.S., 2009. Flow and convective heat
transfer characteristics of water-based Al2O3 nanofluids in fully
developed laminar flow regime. International Journal of Heat and Mass
Transfer 52, 193-199.
[4] Williams, W.C., Buongiorno, J., Hu, L.W., 2008. Experimental
investigation of turbulent convective heat transfer and pressure loss of
alumina/water and zirconia/water nanoparticle colloids (nanofluids) in
horizontal tubes. Journal of Heat Transfer 130 (4), 42412-42419.
[5] Maiga, S.E.B., Nguyen, C.T., Galanis, N., Roy, G., 2004. Heat transfer
behaviours of nanofluids in a uniformly heated tube. Superlattices and
Microstructures 35, 543-557.
[6] Maiga, S.E.B., Nguyen, C.T., Galanis, N., Roy, G., Mare, T., Coqueux,
M., 2006. Heat transfer enhancement in turbulent tube flow using
Al2O3 nanoparticle suspension.
[7] Namburu, P.K., Das, D.K., Tanguturi, K.M., Vajjha, R.S., 2009.
Numerical study of turbulent flow and heat transfer characteristics of
nanofluids considering variable properties.
[8] S. Lee, S.U.S. Choi, S. Li, J.A. Eastman, Measuring thermal
conductivity of fluids containing oxide nanoparticles, Journal of Heat
Transfer 121 (1999) 280-289.
[9] S.K. Das, N. Putra, P. Thiesen, W. Roetzel, Temperature dependence of
thermal conductivity enhancement for nanofluids, transactions of
ASME, Journal of Heat Transfer 125 (2003) 567-574.
[10] S.Z. Heris, M.N. Esfahany, G. Etemad, Investigation of CuO/water
nanofluid laminar convective heat transfer through a circular tube, J.
Enhanced Heat Transfer 13 (2006) 279-289.
[11] S.Z. Heris, M.N. Esfahany, S.Gh. Etemad, Experimental investigation
of convective heat transfer of Al2O3/water nanofluid in circular tube,
Int. J. Heat Fluid Flow 28 (2007) 203-210.
[12] TECNAN Tecnología Navarra de Nanoproductos S.L.Área Industrial
Perguita, C/A Nº 131210 - Los Arcos - Navarra - Espa├▒a Tfno.: +34
948 64 03 18 / Fax: +34 948 64 03 [email protected].
[13] B.C. Pak, Y. I Cho, Hydrodynamic and heat transfer study of dispersed
fluids with submicron metallic oxide particles, Exp. Heat Transfer 11
(1998) 151.
[14] D. Wen, Y. Ding, Experimental investigation into convective heat
transfer of nanofluid at the entrance region under laminar flow
conditions, International Journal of Heat and Mass Transfer 47 (2004)
5181-5188.
[15] Y. Xuan, W. Roetzel, Conceptions for heat transfer correlation of
nanofluids, Int. J. Heat Mass Transfer 43 (2000) 3701.
[16] W. Yu, S.U.S. Choi, The role of interfacial layers in the enhanced
thermal conductivity of nanofluids: a renovated Maxwell model, J.
Nanoparticle Res. 5 (2003) 167.
[17] R.K. Shah, A.L. London, Laminar flow forced convection in ducts,
Supplement 1 to Advances in Heat Transfer, Academic Press, New
York, 1978.
[18] R.K. Shah, M.S. Bhatti, Laminar convective heat transfer in ducts, in: S.
Kakac, R.K. Shah, W. Aung (Eds.), Handbook of Single-Phase
Convective Heat Transfer, Wiley, New York, 1987 (Chapter 3).