Computational Analysis of Ultrasonic Treatment of Melt for Effective Dispersion of Reinforcement Particles Vivek S Ayar 1 , Hardik K Parmar 2 , Mayur P Sutaria 3 1,3 Department of Mechanical Enginnering, C.S.P.I.T.,CHARUSAT,Changa 2 Department of Mechanical Engineering, S.P.C.E., Bakrol vivekahir17@yahoo.com, hardikparmar61@gmail.com, mayursutaria@gmail.com Abstract In many engineering fluids, micro or nano solid particles are introduced to enhance their effect. Introduction of nanoparticles in radiator coolant enhance its efficiency and introduction of micro/nano reinforcement particles in liquid metals enhance its mechanical properties. In most of the applications, de-agglomeration of particle clusters and uniform dispersion of particles is desirable to enhance the process. Ultrasonic streaming and cavitation can help in achieving the desirable output. In this work, the ultrasonic streaming and dispersion of micro SiC particles in water and liquid Aluminium were numerically simulated (using COMSOL multiphysics) and compared. Parameters selected for carrying out the investigations were power of ultrasonic generator and diameter (tip) of probe. Results obtained for water were validated by experimental results. The medium viscosity and density are the key factors influencing ultrasonic streaming and cavitation. The results provide reference for the ultrasonic treatment of melts for making Metal Matrix Composites (MMCs). Keywords- Ultrasonic stirring, Cavitation, MMCs, Ultrasonic Power, Acoustic pressure, Probe tip diameter 1 Introduction With the advancement of the technology, demand for materials with light weight, high strength, and having good tribological properties is ever increasing. Industries in automobile, aerospace, defense and other sector are in constant need for material with good strength, toughness even at the elevated temperature, where conventional materials fail to provide a combination of all the required properties. Thus, to fulfil the demand from the emerging trends, composite materials were developed. Particles of high strength are added in ductile metal to make metal matrix composites having Kalpa Publications in Engineering Volume 1, 2017, Pages 287–293 ICRISET2017. International Conference on Re- search and Innovations in Science, Engineering &Technology. Selected Papers in Engineering A. Shukla, J.M. Patel, P.D. Solanki, K.B. Judal, R.K. Shukla, R.A. Thakkar, N.P. Gajjar, N.J. Kothari, S. Saha, S.K. Joshi, S.R. Joshi, P. Darji, S. Dambhare, B.R. Parekh, P.M. George, A.M. Trivedi, T.D. Pawar, M.B. Shah, V.J. Patel, M.S. Holia, R.P. Mehta, J.M. Rathod, B.C. Goradiya and D.K. Patel (eds.), ICRISET2017 (Kalpa Publications in Engineering, vol. 1), pp. 287–293