Piezoelectric Configurations Effects on Acoustic Energy Density in an Ultrasonic Microcontainer for Preparing Nanoemulsion

Nanoemulsions and their preparing technologies have become one of the most important fields in various industries such as chemical engineering, pharmaceutics and food. Ultrasonic irradiation is a method for preparing nanoemulsions, which is used in different scales. Microcontainers, by use of piezoelectric ceramic (abbr. piezo), are utilized to prepare nanoemulsions in some special researches. Irradiation of ultrasonic waves by these piezos in microcontainers is the most important part of nanoemulsion preparation process. Piezoes arrangement and their excite frequencies have a great effect on interacting waves and therefore, ultrasonic bath performance. In this paper, four configurations of cubic ultrasonic microcontainer have been analyzed by simulations in COMSOL Multiphysics software. Irradiation of ultrasonic waves performed at three frequencies 20, 200 and 300 kHz. In order to determine the best arrangement, the effect of adding piezoes in different frequencies and arrangements has been analyzed. It has been shown that adding two faced piezos, leads to increasing acoustic energy density logarithmically and this increment is more evident in lower frequencies.