hyper sound water purifying system ppt pdf
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Most modern ultrasonic devices are based on transducers that are composed of piezoelectric materials. Such materials respond to the application of an electrical potential through opposite faces with a small change in dimensions. This is the inverse of the piezoelectric effect. If the potential alternates at high frequencies, the crystal converts the electrical energy into mechanical energy of vibration (sound). With a sufficiently high alternative potential, high frequency sound (ultrasound) will be generated. When a more powerful ultrasound is applied at a lower frequency to a system, it is possible to produce chemical changes as a result of acoustically generated cavitation. Frequencies above 18 kHz are generally considered to be ultrasonic. Frequencies used for ultrasonic cleaning, range from 20 kHz to over 100 kHz. The frequencies most used for industrial cleaning are those between 20 and 50 kHz. Ultrasound has wavelengths between successive compression waves measuring approximately 10 to 0.001 m. These are not comparable to molecular dimensions. Because of this mismatch, the chemical effects of ultrasound can not result from direct interaction of sound with molecular species.
Ultrasonic technology as innovative technology can be used for the treatment of water and wastewater for the elimination of pollution. This technology acts as an advanced oxidation process. The application of this technology leads to the decomposition of many complex organic compounds into much simpler compounds during physical and chemical compounds during the cavitation process. Elastic waves with frequencies ranging from the theory of sound from 109 to 1012 or 1013 Hz, basically the high frequency portion of the elastic wave spectrum is known as hyper sound. The physical nature of the hyper sound is not different from that of ultrasounds, whose frequency varies between 2 x 104 and 109 Hz. The hyper-sonic frequency range corresponds to the frequencies of electromagnetic oscillations in the decimetric, centimeter and millimetric ranges ( the so-called super high frequencies or SHF).
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