Viscosity measurements of a ferrofluid: comparison with various hydrodynamic equations

Experimental Investigations on the Viscosity of Magnetic Nanofluids under the Influence of Temperature, Volume Fractions of Nanoparticles and External Magnetic Field

“…Since the control and handling of the flow and energy transport processes in the magnetic fluid are possible by using an external magnetic field, the magnetic fluid expanded into thermal engineering during the past decade besides these applications (Li and Xuan 2009), but very few research are available about the viscosity of different nanofluids and ferrofluids. Some investigations measured the viscosity of the magnetic fluids (Graham 1981;Timko et al 1994;Wagh and Avashia 1996;Patel et al 2003;Li et al 2005;Hong et al 2007;Ren et al 2008). They exposed that the viscosity of the magnetic fluid is greater than that of the base liquid in both the absence and presence of the external magnetic field.…”

Magnetoviscosity in magnetic fluids: Testing different models of the magnetization equation

“…Although there have been many theoretical studies testing particular models, very few studies have been done trying to compare the predictions of different models with the experimental measurements. Comparing with magnetoviscosity measurements of Poiseuille flow of a magnetic fluid in a stationary cylinder with weakly nonequilibrium states, Patel et al 17 showed that the MRSh model could be in good agreement with their experimental results and that the Feld model may lead to significant disagreement with experiment. Comparing with transverse magnetization measurements of a magnetic fluid in a rotating cylinder (a rotating magnetic fluid) for a wide range of nonequilibrium state with a small magnetic field strength, Embs et al 18 showed with amplitude correction factors that the weak-field ML model with proper coefficient setting must be preferred.…”

“…Now we test the validations of different models on the basis of the magnetoviscosity measurements obtained by Patel et al 17 …”

“…is ultimately determined. The present non-linear equations, e.g., (17) and (19), have been numerically solved using the secant method. The procedure performed to obtain the magnetoviscosity can be now described by the following steps: This type of study could help in the determination of material properties, the understanding of transport behavior, and the design requirements of magnetically controllable fluidic devices.…”

Measurement of the Viscosity of Dilute Magnetic Fluids

“…An experimental approach is necessary to determine such a property. By taking the magnetic field into account, some investigations [4][5][6][7][8][9][10] were focused on measurements of the viscosities of magnetic fluids. Experimental results revealed that the viscosity of the magnetic fluid is greater than that of the original carrier liquid independent of the presence of a magnetic field.…”