Ultrasonic Velocity Models in Liquids (Nano-Fluids)

Evaluation of theoretical ultrasonic velocity to describe/justify the nature/type/strength of interaction are important in any medium mainly liquid systems like electrolyte, non-electrolyte, dielectric, ionic, aqueous, non-aqueous and etc., of binary, ternary, tertiary, even pentanary and etc. The values of ultrasonic velocity for the liquid mixtures for various concentrations have been computed using several well-known theoretical models and empirical relations like free length theory (FLT), Rao’s formalism (RF), Dausso Model (DM) and Junjie’s Relation (JR), Nomoto (NR), Van Deal-Vangeal (IMR), Impedance dependence relation (IDR), Collision factor theory (CFT) and Nutsch-Kuhnkies (NK) methods is checked and a comparative study of these models is made. The estimated theoretical values and the validity of these theories and their relation are discussed with the existence of molecular interaction, ideal and non-ideal behavior. It is shown that the correlation of velocities between the adjacent components has a crucial influence mainly on the ideal behavior.