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Acoustical studies of nickel nanoparticles based nanofluids: Concentration and temperature dependent approach
Author : Vijayta Gupta*, Samriti Sharma, Amit Kumar Sharma and Meena Sharma
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ABSTRACT
Thermodynamic, acoustical and transport properties of fluids are extremely significant for explaining the character of molecular relations, which affect the physico-chemical behaviour of liquids. The present investigation was aimed to determine the acoustical parameters of nickel (Ni) nanofluids. The Ni nanoparticles were synthesized and characterized by XRD, TEM, SEM and EDX. The various concentrations (0.05%, 0.1%, 0.15%, 0.2%, and 0.25%) of Ni nanoparticles were dispersed in gum arabicethylene glycol (EG) mixture followed by ultrasonication to obtain Ni-EG nanofluids. Speed of sound, density, viscosity and different acoustical parameters of nanofluids were measured at different concentrations and temperatures. The Ni-EG nanofluids showed increase in speed of sound and acoustic impedance upto 0.2 wt% and later on get decreased. Viscosity and density of nanofluid increased with concentration and decreased with temperature used in this study. The intermolecular free length, adiabatic compressibility, Gibb’s free energy, relaxation time and absorption coefficient first decreased upto 0.2 wt% and then increased. The nanofluids showed decrease in Gibb’s free energy, relaxation time, absorption coefficient, acoustic impedance and speed of sound, and increased for adiabatic compressibility as well as intermolecular free length with increase in temperature. In conclusion, Ni-EG nanofluids upto 0.2 wt% concentration have significant nanoparticle-fluid interaction and could be highly suitable for different industrial applications.
KEYWORD
Ni-EG nanofluids, speed of sound, acoustical studies