Abstract
Investigations of acoustical and thermophysical properties of nanofluids possess a great significance for various types of energy efficient heat transfer management systems. Thus, present study was investigated to evaluate the acoustical parameters and thermal conductivity of cobalt oxide (Co3O4) nanofluids. The Co3O4 nanoparticles were synthesized by co-precipitation method using cobalt chloride as a preparatory material. The nanoparticles were characterized by XRD, FTIR, UV–Vis, TEM, SEM and EDX. Speed of sound, density and viscosity of Co3O4 nanofluids were measured, as a function of concentrations and temperatures, and different acoustic parameters as well as thermal conductivity were determined. The Co3O4 nanofluids showed increase in speed of sound, acoustic impedance and free volume up to 0.4 wt % and later on get decreased. The viscosity, adiabatic compressibility, intermolecular free length, relaxation time, absorption coefficient and Gibb’s free energy first decreased up to 0.4 wt % and then increased. With increase in temperature, these nanofluids showed decrease in speed of sound, viscosity, relaxation time, absorption coefficient, acoustic impedance and Gibb’s free energy, and increase in adiabatic compressibility, intermolecular free length and free volume. The density of Co3O4 nanofluids increased with increase in concentration and decreased with temperature. Thermal conductivity increased up to 0.4 wt % and then decreased. It also decreased with the temperature at all concentrations. Thus, it might be concluded that Co3O4 nanofluids up to 0.4 wt % concentration have significant nanoparticle-fluid interaction and might be highly suitable for heat transfer applications.
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ACKNOWLEDGMENTS
The authors are thankful to Department of Chemistry (University of Jammu) for providing necessary facilities and support for conducting present study and CSIR UGC for Junior Research Fellowship (JRF) to the first author. The authors gratefully acknowledge SAIF STIC (Kochi), SAIF Chandigarh, CIL Chandigarh for providing the facilities for characterization.
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Gupta, V., Sharma, S., Magotra, U. et al. Concentration and Temperature Dependent Effects on Acoustical Parameters and Thermal Conductivity in Cobalt Oxide Nanofluids. Prot Met Phys Chem Surf 57, 1198–1205 (2021). https://doi.org/10.1134/S2070205121060095
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DOI: https://doi.org/10.1134/S2070205121060095