Double-frequency resonant ultrasonic source for producing nanosized emulsions and suspensions

В статье описаны ультразвуковые излучатели большой мощности, осуществляющие обработку несмешиваемых жидкостей и твердых порошковых материалов при высокоэнергетическом акустическом воздействии. Приведены результаты разработки и конструирования магнитострикционных преобразователей и установок для получения нанодисперсных эмульсий и суспензий. Показана эффективность получения нанодисперсных эмульсий ультразвуковым методом на примере получения водо-масляных эмульсий.This article describes an ultrasonic emitters high power engaged in the processing of immiscible liquids and solid powder materials with high-energy acoustic impact. The results of the development and design of magnetostrictive transducers and systems for obtaining nanosized emulsions and suspensions. The efficiency of obtaining nanosized emulsions by ultrasound at the example of a water-in-oil emulsions

Power supplies for dual-frequency induction melting of metals

The article discusses the benefits of multi frequency induction melting in the production of synthetic cast iron, structural (electric circuit) principles of dual frequency Power supplies of melting systems. The ways of electric power regulation of low frequency and high frequency components of the current in the inductor sections of furnace are demonstrated, namely power rescheduling at the metal melting stage, alloying stage and recarburizing of synthetic cast iron

Research of a dual-frequency power supply system for induction crucible furnaces for melting ferrous and non-ferrous metals

The article describes the power supply system of induction furnace based on a semiconductor converter, in which it is possible to work simultaneously in the exciting mode of low-frequency currents and frequencies three times higher when switching the compensation circuit of the furnace inductor at different stages of metal melting. Calculations of electromagnetic processes have shown the advisability of operating the power supply system in the mode of tripling the current frequency at the stage of heating and melting of the metal, but in the mode of low frequency - at the stage of technological processing of the melt. The ratio between the parameters of the furnace power supply in various operating modes are established. © Published under licence by IOP Publishing Ltd

The device for ultrasonic treatment of aluminum and magnesium melts

The paper considers the device for ultrasonic treatment of aluminum and magnesium melts. Also considers the stabilization methods of acoustic power transferred to the melt in the system with magnetostrictive transducer with feedback