High shear homogenizer and high pressure homogenizer which works well

January 02, 2024

High shear homogenizer and high pressure homogenizer which works well
The difference between the high shear homogenizer and the high pressure homogenizer:

name
High shear homogenizer
High pressure homogenizer
Raw material requirements
Powder, block or fruit can be directly put into
The material must be melted and mixed into a fluid before it can be homogenized.
Consumable parts
No need to replace parts within two years, no wearing parts
Homogenizing valves and seals need to be replaced frequently after two or three months of use.
Production operation
Flexible, easy, no need to operate
Need special personnel to operate and adjust
Energy consumption
The power consumption is 1/3 of the high pressure homogenizer
High power consumption, energy waste
Adaptation
Wide range of applications
Not suitable for high viscosity materials
Acidity and alkalinity
Adaptable
Weak adaptability
Homogenization effect
Homogenetic fineness up to 1Î¼m, good stability
The homogeneity is small and the stability is good. However, it is not effective in some industries.
Comprehensive effect
Mixing, sterilization, and homogenization are completed simultaneously
Can only be used separately
cleaning method
Automatic cleaning
Cleaning complex
Comparison of homogenization mechanism between high shear homogenizer and high pressure homogenizer:
Comparison
High shear homogenizer
High pressure homogenizer
Macro
Homogenization
mechanism
Shearing
This is mainly achieved by the fact that the droplets are sheared in the gap between the rotor and the stator rotating at high speed, and thus the combined effect of the gap and the jet of the small holes on the rotor.
When the liquid flows through the gap under high pressure, the liquid droplets are first extended, and then the vortex action when passing through the valve causes the extended portion to be sheared and broken.
Impact
The high-speed rotating droplets are driven by the inertial centrifugal force and have a great impact force, thus causing an impact.
The liquid flow outlet that is punched out at a high speed in the gap of the homogenizing valve is disposed with a retaining ring, thereby generating a high-speed impact.
Cavitation
The centrifugal force acts to make the liquid without entering the annulus have a certain pressure, and after entering the annulus, it becomes a high-speed rotating liquid flow. After the liquid leaves the small hole of the stator, the pressure rises again, so there is also a certain cavitation effect.
The static pressure at the inlet of the liquid flow is very high. When the slit passes, the static pressure energy is converted into kinetic energy, the pressure drops rapidly and drastically, and cavitation is instantaneously caused in the gap. The pressure rises after leaving the gap and the cavity disappears. Thus breaking the droplet
Microscopic
Homogenization
mechanism
The flow of droplets at high-speed rotation of the high-shear homogenizer is quite complicated, mainly controlled by the changing flow velocity acting on the surface of the droplet and the resulting pulsating pressure, so that the tension of the split droplet occurs, and the liquid The drop is broken.
The energy provided by the high pressure homogenizer to the rupture of the droplets comes from the extremely high static energy carried by the feed at the inlet.
At present, the line speed of the shear homogenizer commonly used in China is usually 10 to 25 m/s. Practice has proved that its homogenization effect is not ideal. The high shear homogenizer refers to a shear homogenizer with a linear velocity of 30 to 50 m/s. The main working components are 1 or more stages of intermeshing stator rotors, and each stage of the stator and rotor has several layers of ring gears.
Grinding: The powder is pulverized from large particles into small particles by shear force, friction or impact force.
Dispersion: Nano-powders are coated with solvents, additives, dispersants, resins, etc., so that the particles are completely separated, wetting, distributing, and stabilizing. .
When the nano-powder is dispersed or ground, van der Waals force and Brownian motion phenomenon are gradually obvious and important because the powder scale is changed from large to small. Selecting the appropriate additives to avoid the re-agglomeration of the powder and selecting the appropriate grinder to control the temperature of the polishing slurry to reduce or avoid the influence of Brownian motion. Is the wet grinding dispersion method successfully obtaining the key technology of nano-scale powder grinding and dispersion? .
The nano-grinding disperser is a high-tech product made up of a combination of colloid mill and disperser.
The first stage consists of a multi -stage serrated protrusion and groove with a fine rise . The stator can be adjusted without limitation to the required distance from the rotor. Under enhanced fluid turbulence, the grooves can change direction at each stage.
The second stage consists of a rotating stator. The design of the dispersion head also satisfies the needs of materials of different viscosities as well as particle size. The difference between the design of the on-line stator and rotor (emulsifier head) and the batch head of the batch machine is mainly due to the attention to the requirements for transportability: coarse precision, medium precision, fine precision and others. The difference between some work head types is not only the arrangement of the specified rotor teeth, but also a very important difference is that the geometric characteristics of the different work heads are different. The number of slots, slot width, and other geometric features can change the different functions of the stator and rotor heads. According to past practice, the work head is specified according to previous experience to meet a specific application. In most cases, the construction of the machine is matched to the specific application, so it is important to make the final product. When it is uncertain whether the construction of a work head satisfies the intended application.

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name	High shear homogenizer	High pressure homogenizer
Raw material requirements	Powder, block or fruit can be directly put into	The material must be melted and mixed into a fluid before it can be homogenized.
Consumable parts	No need to replace parts within two years, no wearing parts	Homogenizing valves and seals need to be replaced frequently after two or three months of use.
Production operation	Flexible, easy, no need to operate	Need special personnel to operate and adjust
Energy consumption	The power consumption is 1/3 of the high pressure homogenizer	High power consumption, energy waste
Adaptation	Wide range of applications	Not suitable for high viscosity materials
Acidity and alkalinity	Adaptable	Weak adaptability
Homogenization effect	Homogenetic fineness up to 1Î¼m, good stability	The homogeneity is small and the stability is good. However, it is not effective in some industries.
Comprehensive effect	Mixing, sterilization, and homogenization are completed simultaneously	Can only be used separately
cleaning method	Automatic cleaning	Cleaning complex

Comparison		High shear homogenizer	High pressure homogenizer
Macro Homogenization mechanism	Shearing	This is mainly achieved by the fact that the droplets are sheared in the gap between the rotor and the stator rotating at high speed, and thus the combined effect of the gap and the jet of the small holes on the rotor.	When the liquid flows through the gap under high pressure, the liquid droplets are first extended, and then the vortex action when passing through the valve causes the extended portion to be sheared and broken.
	Impact	The high-speed rotating droplets are driven by the inertial centrifugal force and have a great impact force, thus causing an impact.	The liquid flow outlet that is punched out at a high speed in the gap of the homogenizing valve is disposed with a retaining ring, thereby generating a high-speed impact.
	Cavitation	The centrifugal force acts to make the liquid without entering the annulus have a certain pressure, and after entering the annulus, it becomes a high-speed rotating liquid flow. After the liquid leaves the small hole of the stator, the pressure rises again, so there is also a certain cavitation effect.	The static pressure at the inlet of the liquid flow is very high. When the slit passes, the static pressure energy is converted into kinetic energy, the pressure drops rapidly and drastically, and cavitation is instantaneously caused in the gap. The pressure rises after leaving the gap and the cavity disappears. Thus breaking the droplet
Microscopic Homogenization mechanism		The flow of droplets at high-speed rotation of the high-shear homogenizer is quite complicated, mainly controlled by the changing flow velocity acting on the surface of the droplet and the resulting pulsating pressure, so that the tension of the split droplet occurs, and the liquid The drop is broken.	The energy provided by the high pressure homogenizer to the rupture of the droplets comes from the extremely high static energy carried by the feed at the inlet.