![]() ![]() Thermal conductivity increased as the solid concentration and temperature increased. Dynamic viscosity of the nanofluid decreased as temperature increased. Dynamic viscosity of the nanofluid increased as solid concentration increased. The nanofluid showed Newtonian behavior in all the temperatures and concentrations. The results also revealed that the apparent viscosity generally increases with an increase in the solid volume fraction. Moreover, the consistency index and power law index have been obtained by accurate curve fitting for samples with non-Newtonian behavior of nanofluids. The value of maximum enhancement is which occurred in 25 <. The results showed that viscosity has a direct relationship with solid volume fraction of the nanofluid. The measurement results at different shear rates showed that the base fluid and nanofluid samples with solid volume fractions of less than 0.5% had Newtonian behavior, while those with higher solid volume fractions (0.75 and 1%) exhibit a pseudoplastic rheological behavior with a power law index of less than unity. The nanofluid was prepared with solid volume fractions between 0.0625 and 1%, and experiments were performed in the temperature range of 25–50 <. In this paper, experimental investigation of the effects of volume concentration and temperature on dynamic viscosity of the hybrid nanofluid of multi-walled carbon nanotubes and aluminum oxide in a mixture of water (80%) and ethylene-glycol (20%) has been presented. Nanofluids are prepared by suspending the nanoparticles in the base fluid and can be substantially enhanced the heat transfer rate compared to the pure fluids. Investigations showed that maximum value for the margin of deviation for the proposed equation was equal to 8%, which is acceptable for an experimental equation. Due to the lack of a precise and appropriate equation for the prediction of dynamics viscosity of silver/ethylene glycol nanofluid, an equation was provided based on the measurement results, which was a function of volume fraction and temperature. Relative viscosity of the nanofluid increased approximately by 88.46, 90.44, 83.25, and 82.06% by increasing the volume fraction from 0.25 to 2% at 40, 45, 50, and 55 <, respectively. On the other hand, dynamic viscosity of the fluid decreases with increasing temperature. According the results, dynamic viscosity increases with increasing the volume fraction. Dynamics viscosity of nanofluid is measured using the DVI PRIME Brookfield digital viscometer which has a doublewall cylindrical container. In this experiment, the nanofluid was exposed to ultrasound waves for various durations to study the effect of this parameter on dynamic viscosity of the fluid. This does not yet include AV's latest tweaks (M3 above) - however the differences for most applications should be quite minor.This experimental study addressed developing a new model for the dynamic viscosity of silver/ethylene glycol nanofluid within the temperature range of 25–55 < for samples with volume fractions of 0.25, 0.5, 0.75, 1, 1.5, and 2%. The other (written by A.V.) takes theĪ python version has now also been written by Matthew Partridge at Cranfield University. One takes volume fraction of glycerine as input. Further refinements from Andreas Volk to density of pure water, and the temperature-dependence of the contraction of the mixture. In both cases the fit was chosen to match data from Gregory (table 3 and 7) Andreas Volk pointed out that the density calculation can be made more accurate by (i) accounting for the volume contraction of the mixture (ii) adjusting the fit for the density of pure glycerine as a function of temperature. Thanks to Paul Debue for pointing this out. The mixture should use the glycerine fraction by VOLUME and not by mass. Density calculation has been changed: equation 25 in Cheng's paper to compute the density of I'd recommend reading the latter paper first. Kähler (2018) Experiments in Fluids 59 75. 47 3285-3288, with a number of adjustments (see below), which are described in Volk and The calculation is based on the parameterisation in Cheng (2008) Ind. Calculate density and viscosity of glycerol/water mixturesĭynamic viscosity of mixture is : ![]()
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