Effect of Milling Time and Particle Concentration on Stability, Thermal Conductivity and Viscosity of Water-Based Silicon Carbide Nanofluids
15 Pages Posted: 8 Aug 2019
Date Written: February 12, 2019
The effect of the particle size and the concentration of the Silicon Carbide (SiC) nanoparticles in the base fluid (i.e., distilled water (DW)) on the thermo-physical properties of the fluid is investigated in the present article. SiC nanoparticles are synthesized from the micron powder of SiC, by ball milling it at different times and are characterized for size, crystal structure and surface morphology by X-Ray diffraction (XRD) and Field emission scanning electron microscope (FESEM). The nanoparticles are dispersed in the distilled water at different concentrations (0.01%wt. to 0.1%wt.) by ultrasonic vibrations in an ultrasonicator. The Dynamic light scattering (DLS) analysis is carried out for analyzing the size of the SiC nanoparticles in the fluids. The stability of the nanofluids is measured for zeta potential using zeta sizer Nano ZS90. The visual inspection technique is employed to study the sedimentation behavior of the nanofluids. The SiC nanofluids are then tested for thermal conductivity (TC) in a KD2Pro thermal conductivity analyzer and viscosity in a Physica MCR51 rheometer. An enhancement of 19% in TC and an increase in the viscosity of 46.01% with that of the base fluid for the nanofluid with 0.1% weight concentration at 30oC is observed from the experimental results. The empirical correlations were established for TC and viscosity and the obtained correlations are fitted with the experimental data. The overall effectiveness of Prasher’s model and Mouromtseff’s expressions shows that the above nanofluid has a promising capability for enhancement of heat transfer in laminar flow heat transfer applications, but not for turbulent flow conditions.
Keywords: Particle size, Concentration, Nanofluids, Stability, Thermal Conductivity, Viscosity
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