The ultrasonic homogenizer uses the huge energy generated by the cavitation effect to strongly disperse the liquid flowing through the equipment, and plays the role of emulsification and homogenization. At the same time, the tiny bubbles inside the liquid are driven out, large particles are crushed, and precipitation is prevented to meet the requirements of industrial homogeneous treatment. Ultrasonic industrial homogenizers are generally used as non-standard equipment, customized into personalized styles to meet the batch liquid processing needs of different industries and different working conditions.
Ultrasonic industrial homogenizers are widely used in fields such as ultrasonic dispersion, ultrasonic emulsification, ultrasonic cell crushing, ultrasonic extraction and separation, ultrasonic exhaust and accelerated chemical reactions. Specific industries include:
1) Fuel: Fuel oil is emulsified with water to save fuel and reduce exhaust pollution.
2) Food: emulsification of adding sugar to milk, emulsification of ghee to make high-grade lactose, dispersion of raw materials in sauce making, etc.
3) Cosmetics: emulsify wax, paraffin, etc. to produce fine particles of oils such as detergents, shampoos, lotions, etc. that are dispersed.
4) Lubricant: Emulsification of rolling oil, emulsion production used for cooling and lubrication during metal plate rolling.
5) Coating: emulsification of waterproof coating agent for packaging, emulsification of polyethylene in water, emulsification of waterproofing agent, emulsification of resin processing fluid for fishing nets.
6) Chemical industry: Accelerate chemical reaction speed, dispersion in the production of fluorescent materials and photosensitive materials, etc.
7) Medicine: Extraction of active ingredients of Chinese herbal medicine.
8) Environmental protection: sewage treatment.
Principle
Cavitation is when ultrasonic waves propagate in the medium. The average distance of molecules in the liquid changes with the vibration of the molecules. When it exceeds the critical molecular distance that maintains the effect of the liquid, cavitation is formed. Ultrasonic cavitation is divided into two forms, steady-state cavitation and transient cavitation. Steady-state cavitation can occur under the action of low sound intensity. The bubbles slowly expand during the negative pressure half cycle, and slowly shrink but do not burst during the positive pressure half cycle. The bubbles perform periodic, non-linear oscillatory motion. The life of the steady-state cavitation bubble is relatively long, the degree of cavitation is relatively mild, and the impact on the medium microenvironment is small; the transient cavitation adiabatic shrinkage to the moment of expansion can generate high temperature and high pressure in the bubble, destroying the cell structure or breaking the cells, causing Enzyme inactivation. The severe degree of transient cavitation causes the medium to form multiple local extreme physical and chemical environments, which has a greater impact on the medium microenvironment. Transient cavitation uses this special energy form to accelerate certain chemical reactions and activate new channels for certain reactions.
The high-frequency oscillation signal emitted by the ultrasonic generator is converted into high-frequency mechanical vibration through the transducer and spreads into the medium. The ultrasonic waves radiate forward in the solution in an alternating manner. When the pressure of the sound waves reaches a certain atmospheric pressure, Tens of thousands of tiny bubbles are generated. These bubbles form and grow in the negative pressure area where the ultrasonic wave propagates longitudinally, and quickly close in the positive pressure area. This phenomenon is called ultrasonic "cavitation." Cavitation can be used to promote chemical reactions, crush suspended solids in liquids, create emulsions, kill bacteria, or clean mechanical parts, etc. Ultrasonic homogenization uses the cavitation effect of ultrasonic waves in liquids to achieve uniform dispersion of materials. The homogenizing effect of ultrasonic waves is not only related to the power density, but also to the ultrasonic frequency and ultrasonic treatment time. At the appropriate ultrasonic frequency, the ideal dispersion effect can be achieved with the minimum power density within a certain period of time.
Post time: 2023-10-09 14:53:28