Experimental study and Taguchi Analysis on alumina-water nanofluid viscosity

2018-01-05
Elcioglu, Elif Begum
Güvenç Yazıcıoğlu, Almıla
TURGUT, ALPASLAN
Anagun, Ahmet Sermet
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
130
views
0
downloads
Nanofluids as dispersions of fine particles within industrial fluids have potential in thermal applications due to their improved thermal characteristics. On the other hand, their viscosity may be a limitation for forced convective heat transfer, since increase in viscosity increases the pump power requirement. In this study we report experimental results for alumina-water nanofluid viscosity at different temperatures, for different nanoparticle fractions and diameters. Experimental data were collected based on a Taguchi experiment design (L8). Statistical analyses via Taguchi Method were done to determine the effects of experiment characteristics on nanofluid viscosity and relative viscosity. The viscosity of nanofluids decreased sharply with temperature (20-50 degrees C); increased with nanoparticle fraction (1-3 vol%), and increased slightly with nanoparticle diameter (10 +/- 5 nm, 30 +/- 10 nm). Taguchi Analysis revealed that the importance of the parameters on nanofluid viscosity can be sorted from lower to higher sequence as temperature, nanoparticle fraction, and nanoparticle diameter; and they were all statistically significant on nanofluid viscosity. One novel conclusion is that the interaction effect of temperature and nanoparticle volumetric fraction was significant on nanofluid viscosity at alpha = 5%, thus the effect of nanoparticle fraction was different at different temperatures, and vice versa. This interaction effect appeared in the developed nanofluid viscosity equation with a novel term, the product of temperature and nanoparticle fraction. This result may be beneficial for hydrodynamic applications, where the thermal aspects and flow characteristics need to be considered simultaneously.
Design of experiments, Taguchi Method, Alumina-water, Nanofluids, Viscosity
https://hdl.handle.net/11511/41991
APPLIED THERMAL ENGINEERING
Department of Mechanical Engineering, Article

Suggestions

Experimental based numerical approach for determination of volumetric heat transfer coefficients of modified graphite foams
GÜRÜF, GÜRŞAH; Solmus, Ismail; BİLEN, Kadir; Bayer, Özgür (Elsevier BV, 2020-06-25)
Graphite-based porous materials are emerging as attractive alternatives to metals for use as heat dissipation elements in thermal management applications. While having several desirable features such as high thermal conductivity and low density, graphite foam heat sinks also tend to have low permeability that can limit transport of working fluid within the component and result in inefficient heat transfer. In order to improve their heat dissipation performance, graphite foams can be modified by channels dri...
Design of oxygen-doped TiZrHfNbTa refractory high entropy alloys with enhanced strength and ductility
Iroc, L.K.; Tukac, O.U.; Tanrisevdi, B.B.; El-Atwani, O.; Tunes, M.A.; Kalay, Yunus Eren; Aydoğan Güngör, Eda (2022-11-01)
© 2022Refractory high entropy alloys (RHEAs) are considered promising materials for high-temperature applications due to their thermal stability and high-temperature mechanical properties. However, most RHEAs have high density (>10 g/cm3) and exhibit limited ductility at low temperatures and softening at high temperatures. In this study, we show that oxygen-doping can be used as a new alloy design strategy for tailoring the mechanical behavior of the TiZrHfNbTa alloy: a novel low-density (7.98 g/cm3) ductil...
Physical properties of CdSe thin films produced by thermal evaporation and e-beam techniques
Huş, Şaban Mustafa; Parlak, Mehmet; Department of Physics (2006)
CdSe thin films were deposited by thermal evaporation and e-beam evaporation techniques on to well cleaned glass substrates. Low dose of boron have been implanted on a group of samples. EDAX and X-ray patterns revealed that almost stoichiometric polycrystalline films have been deposited in (002) preferred orientation. An analysis of optical measurements revealed a sharp increase in absorption coefficient below 700 nm and existence of a direct allowed transition. The calculated band gap was around 1.7 eV. Th...
Robust design of lithium extraction from boron clays by statistical design and analysis of experiments
Büyükburç, Atıl; Köksal, Gülser; Department of Industrial Engineering (2003)
In this thesis, it is aimed to design lithium extraction from boron clays using statistical design of experiments and robust design methodologies. There are several factors affecting extraction of lithium from clays. The most important of these factors have been limited to a number of six which have been gypsum to clay ratio, roasting temperature, roasting time, leaching solid to liquid ratio, leaching time and limestone to clay ratio. For every factor, three levels have been chosen and an experiment has be...
Synthesis and structural characterization of co-al binary alloys
Dinler, Ali Fırat; Mekhrabov, Amdulla O.; Akdeniz, Mahmut Vedat (null; 2018-10-27)
As a part of an investigation on the design and development of Co-based superalloys for hightemperature applications, studies have been made to investigate synthesis route, heat treatment regime and structural characterization of binary Co-Al alloys. Cobalt-rich side of Co-Al binary system was examined by preparing 6 different alloy compositions (1.23, 8.40, 16.72, 19.50, 21.50 and 25 at. % Al), which were produced by arc melting technique. It has been found that DOOR\V KDYLQJ UHODWLYHO\ KLJK $O FRQWHQW • ...
Citation Formats
E. B. Elcioglu, A. Güvenç Yazıcıoğlu, A. TURGUT, and A. S. Anagun, “Experimental study and Taguchi Analysis on alumina-water nanofluid viscosity,” APPLIED THERMAL ENGINEERING, pp. 973–981, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41991.
METU IIS - Integrated Information Service open@metu.edu.tr