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Title: Study On the Viscous Behavior of Al2O3 - H2O, Ethylene Glycol Based Nanofluids
Authors: Singh, Jaskaran
Supervisor: Lal, Kundan
Keywords: Nano Fluid;Alumina;XRD;TEM;EG-ethylene glycol
Issue Date: 25-Oct-2012
Abstract: Nanofluid is a colloidal solution in which nanoparticles (1 to 100 nm) are suspended in the base fluid. It has been found that they have potential use in cooling applications because of their improved heat removal capabilities. Since most of the cooling methods used, involve forced circulation of the coolant, therefore modifications in properties of fluids which can result in an increased pumping power requirement is a critical issue. As it is evident that, viscosity is one of the thermo-physical property of the fluid which significantly affects the pumping power as well as the convective heat transfer performance of the coolants, as the Prandtl number and Reynolds number are functions of viscosity. In most of the cold countries, the minimum ambient temperature dips to about -30 0C to -40 0C and the coolants used must have lower freezing points. Therefore, the ideal coolant is one which will have a lower freezing point and a lower viscosity. Pure ethylene glycol has a freezing point of about -12 0C, but when it is mixed with water, the freezing point of the mixture gets depressed to -45 0C. Pure water has a freezing point of 0 0C, therefore it cannot be used in cold countries. Water has a lower viscosity as compared to the ethylene glycol and when water is mixed with ethylene glycol, the resulting mixture has a viscosity lower than pure ethylene glycol. Therefore, 60:40 ratio mixture of ethylene glycol and water by volume has a lower freezing point and a lower viscosity as compared to the pure ethylene glycol. This is the reason for using one of the base fluids as a mixture of water and ethylene glycol. In the present research work, the effect of factors such as volumetric concentration of the nanoparticles, temperature, shear rate on the viscous behavior of Al2O3 nanoparticles in two base fluids- (Ethylene Glycol) and (a mixture of Water and Ethylene Glycol mixed in the ratio of 60:40 by volume) has been studied. Very low volumetric concentrations of 0%, 0.005%, 0.01%, 0.05%, and 0.1% of Al2O3 nanoparticles have been used in this experimental work. The Al2O3 nanoparticles having an average particle size of 40 nm are used in this work. The temperature is varied from 25 0C to 50 0C and shear rate is varied from 38 to 190 (1/s). The Rheological behavior i.e. Newtonian/ Non- Newtonian behavior is also studied.
Description: M.E. (Thermal Engineering)
Appears in Collections:Masters Theses@MED

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