Abstract
The objective of the paper is to measure the velocity profiles of water based nanofluids for flow through channels in order to understand whether the nanofluids behave Newtonian. For this purpose, experiments were carried for flow through a rectangular channel in laminar regime. Four different nanofluids were used, i. e. Al2O3, CuO, TiO2 and SiO2 with base fluid as water. Experiments were conducted at low concentration of these particles. The velocity profiles were measured using Particle Image Velocimetry. The results indicate that the velocity profiles are similar for all the fluids indicating the flows to be Newtonian.
Kurzfassung
In diesem Beitrag werden experimentelle Untersuchungen zur Messung von Geschwindigkeitsprofilen wasserbasierter Nanofluide in Kanälen vorgestellt. Die Messungen dienten der Untersuchung des Verhaltens von strömenden Nanofluiden und der Fragestellung, ob diese sich wie Newtonsche Fluide verhalten. Dazu wurde ein Versuchsstand mit einem rechteckigen Strömungskanal und laminarer Strömung aufgebaut. Die vier Nanofluide Al2O3, CuO, TiO2 und SiO2 wurden in geringer Konzentration auf Wasserbasis untersucht. Mit Hilfe der PIV-Messungen wurde festgestellt, dass für diese vier Nanofluide die gemessenen Geschwindigkeitsprofile denen von Newtonschen Fluiden sehr ähnlich sind.
References
1 Kostic, M.: Critical Issues and Application Potentials in Nanofluids Research. Proceedings of MN2006, Multifunctional Nanocomposites Honolulu, Hawai (2006)Search in Google Scholar
2 Wang, X.; Mujumdar, A. S.: Heat transfer characteristics of nanofluids: a review. Int. J. Therm. Sci.46 (2007) 110.1016/j.ijthermalsci.2006.06.010Search in Google Scholar
3 Das, S. K.; Putra, N.; Roetzel, W.: Pool boiling characteristics of nano-fluids. Int. J. Heat and Mass Transfer46 (2003) 85110.1016/S0017-9310(02)00348-4Search in Google Scholar
4 Yang, Y. A.; Oztekin, S.; Neti, S.; Mohapatra, S.: Characterization and Convective Heat Transfer with Nanofluids. ASME/JSME 8th Thermal Engineering Joint Conference, Micro/Nano Scale Phenomena and Thermal Properties, Transport Phenomena in Nano-Scale Energy Systems (2011)Search in Google Scholar
5 Daungthongsuk, W.; Wongwises, S.: A critical review of convective heat transfer of nanofluids, Renewable and Sustainable Energy Reviews11 (2007) 79710.1016/j.rser.2005.06.005Search in Google Scholar
6 Kim, D.; Kwon, Y.; Cho, Y.; Li, C.; Cheong, S.; Hwang, Y.; Lee, J.; Hong, D.; Moon, S.: Convective heat transfer characteristics of nanofluids under laminar and turbulent flow conditions. Current Applied Physics9 (2009) e11910.1016/j.cap.2008.12.047Search in Google Scholar
7 Kakaç, S.; Pramuanjaroenkij, A.: Review of convective heat transfer enhancement with nanofluids. Int. J. of Heat and Mass Transfer52 (2009) 318710.1016/j.ijheatmasstransfer.2009.02.006Search in Google Scholar
8 Phuoc, T. X.; Massoudi, M.: Experimental observations of the effects of shear rates and particle concentration on the viscosity of Fe2O3 – Deionized water nanofluids. Int. J. of Therm. Sci.48 (2009) 129410.1016/j.ijthermalsci.2008.11.015Search in Google Scholar
9 Nguyen, C.T.; Desgranges, F.; Roy, G.; Galanis, N.; Maré, T.; Boucher, S.; Angue MintsaH.: Temperature and Particle-Size Dependent Viscosity Data for Water-Based Nanofluids-Hysteresis Phenomenon. Int. J. Heat and Fluid Flow28 (2007) 149210.1016/j.ijheatfluidflow.2007.02.004Search in Google Scholar
10 Bobbo, S.; Fedele, L.; Benetti, A.; Colla, L.; Fabrizio, M.; Pagura, C.; Barison, S.: Viscosity of water based SWCNH and TiO2 nanofluids. Exp. Therm. Fluid Sci.36 (2012) 6510.1016/j.expthermflusci.2011.08.004Search in Google Scholar
11 Chen, H.; Yang, W.; He, Y.; Ding, Y.; Zhang, L.; Tan, C.; Lapkin, A.; Bavykin, D. V.: Heat transfer and flow behaviour of aqueous suspensions of titanate nanotubes (nanofluids). Powder Technology183 (2008) 6310.1016/j.powtec.2007.11.014Search in Google Scholar
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