What is the ultrasonic?

Wave can be divided into three kinds, namely, sound, sound waves, ultrasonic. The frequency of the sound of 20 hz; The frequency of the sound waves to 20 hz to 20 KHZ; The frequency of the ultrasound is more than 20 KHZ. The sound and ultrasonic wave to the human ear is generally can’t hear. Ultrasonic due to high frequency, wavelength, and therefore the spread of the directional well, strong penetrating power, are widely used in industry, medicine, food, rubber, shipbuilding and other fields.

Ultrasonic wave reflection, refraction, diffraction, scattering in medium propagation law, and the rule of audible sound waves there is no essential difference. But the very short wave lengths of ultrasound make only a few centimeters, even several millimeters per thousand. Compared with audible sound waves, ultrasonic has many strange properties: propagation – a very short wave lengths of ultrasound make, usually the size of the obstacles to a lot of times larger than the wavelength of ultrasonic, ultrasonic diffraction ability is very poor, therefore, it can in a homogeneous medium directional line, the shorter the wavelength of ultrasound, this feature is more significant. With enough large amplitude of ultrasonic wave ACTS on liquid medium, the medium, the average distance between molecules will more than make the liquid medium critical molecules remain the same distance, liquid medium fracture occurs, the formation of foam. These small hole expands rapidly and closed, can make the liquid particles between violent impact effect, causing thousands to tens of thousands of atmospheres of pressure. The intense interaction between particles, can make the liquid temperature rise, has played a very good mixing effect, so that the two don’t mix liquid (such as water and oil) emulsion, and accelerate the solute dissolved, accelerate the chemical reaction.