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In this study, the methanol-based nanofluids with tin oxide (SnO2) nanoparticles of 8-12 nm in diameter are prepared by dispersing nanoparticles in pure methanol under stirring process. The main objective of this paper is to measure the ultrasonic velocity, density and viscosity of the methanol-based SnO2 nanofluids as a function of molar concentration of nanoparticles (0.002M to 0.01M) in the temperature range (25, 30, 35 and 40oC) at 1 MHz frequency. The obtained experimental result of ultrasonic velocity, density and viscosity compared with Urick model, Einstein model and Pac and Cho model. The concentration at which particle–fluid interaction is most effective is identified for nanofluids applications by a non destructive ultrasonic technique. The dipole-induced dipole type of interaction is responsible for variation in acoustical parameters. The enhancement in ultrasonic velocity at 0.004M concentration is due to agglomerisation of nanoparticles in the methanol based nanofluids.
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