Ultrasonic waves are defined as waves with frequencies higher than the human auditory range and have numerous applications in various fields. One of these applications is the use of these waves in textile cleaning, which has been addressed in recent decades. The reason for using these waves in cleaning processes is a phenomenon called cavitation, which occurs when bubbles are created around the fabric and energy is released upon bubble collapse. The main objective of this research is to design and construct a stain removal device using ultrasonic waves and investigate the effect of megahertz waves that generate microwaves in the washing chamber. For this purpose, the components of this device were designed and built, followed by experimental tests. Two ultrasonic devices with frequencies of 34 kilohertz and 1.7 megahertz were used in this study. In the designed experiments to examine the simultaneous and separate effects of kilohertz and megahertz frequencies, the distance from the fabric and the type of stains, including soot, plum juice, and oil, were varied in multiple trials. For the analysis of results and conclusion, electron microscopes and spectrophotometers are commonly used in most studies, and in this research, image processing was also employed to investigate the results. Fractal analysis was used to analyze the data. The experiments revealed that megahertz waves improve fabric cleaning, but the maximum impact occurs when the transducer used at a frequency of 34 kilohertz is at a distance from the fabric or when it is in close contact with the fabric. The presence of megahertz waves did not have a significant effect on the results. Another finding is that the presence of megahertz waves had different effects at different angles of fabric washing, and the angle of 60 degrees demonstrated the best performance among the tested angles in this study. On the other hand, the distance between the transducer and the fabric has a direct relationship with the washing efficiency, and as this distance increases, the washing efficiency decreases, with different levels of cleanliness for different types of stains. In this study, plum juice stains showed the highest cleaning efficiency. By eva‎luating the results obtained from spectrophotometry and the fractal method, it was concluded that these two methods had a high correlation with each other, and the new method used in this research can be considered as a novel approach for eva‎luating cleanliness and washing efficiency.

علي لقماني , امين اله محمدي

مهدي حجازي

محمد دانش , عليرضا فدائي تهراني