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Method and devices for sonicating liquids with low-frequency high energy ultrasound

An ultrasonic, high-energy technology, applied in chemical/physical/physical-chemical processes, chemical instruments and methods, chemical/physical/physical-chemical nozzle reactors, etc. Expensive and other issues

Active Publication Date: 2012-12-12
DR HIELSCHER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But coating is expensive and its efficacy is limited by time
In addition, the coated material will also erode in the liquid

Method used

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  • Method and devices for sonicating liquids with low-frequency high energy ultrasound
  • Method and devices for sonicating liquids with low-frequency high energy ultrasound
  • Method and devices for sonicating liquids with low-frequency high energy ultrasound

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Embodiment Construction

[0031] figure 1 The liquid pressure pmax(A) process is shown, through which the generation of cavitation can be completely suppressed, because when p>pmax(A), the liquid is pressed on the surface of the ultrasonic probe that transmits vibrations, so that local vacuum bubbles cannot appear. In contrast, there is a minimum vibration amplitude Amin(p) for each liquid pressure p below which cavitation cannot occur. The maximum liquid pressure pmax(A) and the minimum vibration amplitude Amin(p) can be determined empirically for different liquids. For example, cavitation erosion or high-frequency ultrasound reflections at the surface of the vibratingly propagating ultrasound probe can be used as measured values. The latter is used to generate vibrations in the megahertz range when cavitation bubbles implode.

[0032] By changing the vibration amplitude A at different distances D from the surface of the ultrasonic probe propagating vibrations according to the present invention, or ...

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Abstract

The invention relates to a method and devices for sonicating liquids with low frequency high energy ultrasound comprises a low frequency high energy ultrasound system having at least one sonotrode which projects into a reactor vessel through which the liquid passes via at least one inlet orifice and at least one outlet orifice. To avoid cavitation at the sonotrode, it is proposed that in a close region of the oscillation-transducing sonotrode surface within the reactor vessel a pressure / amplitude combination close to or above the pressure-amplitude characteristic line is generated at which considerably reduced or no cavitation occurs and in the adjacent region in the reactor vessel at least in a region and at least at times a pressure / amplitude combination is maintained below the pressure-amplitude characteristic line at which cavitation is generated. A corresponding device has, for example, an inlet orifice ( 4 ) which is arranged in such a manner that the liquid impacts directly onto the oscillation-transducing sonotrode surface ( 3 ), and which is shaped in such a manner that in the close region of the oscillation-transducing sonotrode surface ( 3 ) a pressure (p) close to or above the pressure-amplitude characteristic line prevails.

Description

technical field [0001] The present invention relates to a method and device for ultrasonically ultrasonicating liquids with low frequency and high energy. It consists of a low frequency and high energy ultrasonic system with at least one ultrasonic probe protruding from a reactor vessel through which the liquid passes through at least one inlet hole and at least An outlet hole flows through the container. Background technique [0002] Low-frequency high-energy ultrasound (NFLUS) is an ultrasound with a working frequency of 15-100 kHz, preferably 15-60 kHz, such as 20 kHz, and an ultrasonic power of more than 10 W, preferably 100-20,000 W, such as 8,000 W. For generating ultrasonic waves, for example piezo-electric or magneto-inductive systems are used. Linear acoustic transducers are known, as well as flat or curved plate vibrators or tube resonators. Low-frequency high-energy ultrasonic waves are widely used in liquid treatment, such as food, cosmetics, pigments and nanom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/10B01J19/00B01J19/26
CPCB01J19/26B01J2219/0869B01J2219/0877B01J19/008B01J19/10Y10S366/60B01J19/00
Inventor 哈拉尔德·希尔舍霍尔格·希尔舍托马斯·希尔舍
Owner DR HIELSCHER
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