Vol. 7, Issue 7, Part A (2025)

Transportation, power generation, micro-manufacturing, electronics, engines, thermal therapy, heating, cooling, ventilation, and air conditioning are just a few of the industrial areas to which nanofluids provide intriguing heat transfer applications. Al₂O₃ nanoparticles have been uniformly suspended in water with varying concentrations in the current work. In the concentration range of 0.1 to 0.8 w/V%, the ultrasonic velocity, absorbance, density, and viscosity measurements were performed. Using a 2 MHz frequency, an ultrasonic interferometer measures ultrasonic velocity and absorption. The conductivity parameter, FTIR properties, viscosity, intermolecular interaction, and molecular free length are used to understand changes in these parameters. As the concentration of alumina oxide increased, the density, viscosity, and sound velocity changed nonlinearly. The drop in molar sound velocity and adiabatic compressibility occurs with concentration, while surface tension, internal pressure, and molecule free length all rise. Different types of molecular contacts, their physico-chemical behavior, and their strength are indicated by variations in acoustic and thermodynamic characteristics.