Evaluation of acoustical parameters and thermal conductivity of TiO₂-ethylene glycol nanofluid using ultrasonic velocity measurements

Abstract

Abstract:The nanosized titanium oxide (TiO 2 ) nanoparticles (NPs) were synthesized via sol-gel method. The crystalline nature of the synthesized TiO 2 nanoparticles was confirmed by X-ray powder diffractometry method. The surface morphology and particle size of the nanoparticles were analyzed by high-resolution scanning electron microscopic method. UV-visible spectroscopy was employed to determine its band gap energy value. The different concentrations of nanofluid samples of TiO 2 NPs dispersed in ethylene glycol were prepared and mixed thoroughly by ultrasonication process. The value of ultrasonic velocity and density were measured for the different concentrations of TiO 2 nanofluids. The acoustical parameters such as adiabatic compressibility, intermolecular free length, and acoustic impedance were calculated from the experimental data. It was observed that ultrasonic velocity showed linearity with particle concentration, and the results were discussed. In addition to the TiO 2 -ethylene glycol (particle-fluid) interaction studies, a new methodology was proposed to find the thermal conductivity of nanofluids using ultrasonic velocity.

Materials characterization of advanced fillers for composites engineering applications

“…In general, in the matrix of the sound attenuating material dissipation of the incident acoustic wave is converted to mechanical energy and heat [28]. This proceeds by combination of the following processes.…”

Ultrasonic and thermodynamic investigation of reduced graphene oxide-n methyl-2-pyrrolidone nanosuspension

“…The growth of the number of particles present with increasing concentration also contributes to the outward layer, which additionally increases the speed inside the sample. An increase in the temperature decreases the ultrasonic velocity in the sample; that might be because the zigzag motion of the solvent molecules increases with the rise in the heat, which hinders the passage of ultrasonic waves through the sample [30][31].…”

“…On the other hand, the viscosity of the rGO-NMP nanosuspension declines with an upsurge in the temperature. The fundamental reason behind this decrease is the rise in the zigzag movement of the NMP solvent molecules increases with increasing temperature [2], [31].…”

Analysis on thermal conductivity of green processed alumina nanofluid for thermal industries

“…Thus, triumphant features of heat transfer fluid called nanofluid [1] clear its importance as an efficient and sensitised material for modern industries and nanotechnology. Ultrahigh performance cooling is one of the most crucial needs of many industries ranging from macro to nano, space science, and medical science as an efficient consideration for different mechanisms and processes technology [2][3][4][5]. Though there are many investigations on thermal conductivity of different metals with a base fluid-like ethylene-glycol nanofluid, water as the base fluid has high significance than others [6].…”