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Ultrasonic micro-molecules in the solid wax spread

n recent years, the use of ultrasonic treatment suspension to removal or separation of the particles in the liquid metal, bubbles or droplets more and more people attention, which mainly includes two aspects, one study in the high-temperature liquid metal ultrasonic method, the second is the use of ultrasound to remove the liquid metal in the process of non-metallic inclusions theoretical analysis, numerical calculation and experimental studies.
Among them, the use of ultrasonic standing wave field the condensed metal inclusions is an important direction. In the ultrasonic standing wave field, as long as the sound of the liquid and particulate suspension ratio factor is not zero, the fine particles in the acoustic radiation force abdominal section to sound pressure or sound pressure Sports. In this process, the particle collision condensate, and ultimately achieve cohesion equilibrium.
The molten metal containing nonmetallic inclusions can be regarded as a suspension inclusions also occur under the action of the ultrasonic wave in a certain frequency, the agglomeration effect. But the formation of the ultrasonic standing wave field, can not enter a higher power ultrasound, so that the application in a large metallurgical equipment, pool inclusions are subject to certain restrictions. Ultrasonic used in metallurgical processes is one of the focus, but the the power ultrasonic particle agglomerates effect is less involved.
Therefore, this paper, Ultrasonic cavitation bubbles generated cohesion characteristics of particles in the liquid paraffin to study, observe and analyze power ultrasonic cavitation threshold above the distribution of particles in the liquid paraffin and cavitation bubbles and particles interaction.
1 Experiment 11 Experiment materials and equipment experiment paraffin ordinary Medical slice paraffin particles are PMMA particles, particle size less than 063mm.
The major experimental facilities: FS250 ultrasonic instrument (maximum power 150W, frequency 20kHz), electronic scales, thermometers, etc..
The paraffin specimens observed by the OLYMPUSBX51 optical microscope, macro-distribution with a digital camera.
12 experimental process begins within 75 thermostatic water bath plexiglass container liquid paraffin melting clear and colored plexiglass particle particle diameter of 063mm, and stir evenly. First applying an ultrasonic wave, the comparison sample of the particulate matter distribution state obtained after solidification of the paraffin. Then applied to the horn 30W, 375W, 45W and 525W ultrasonic processing time of 5min and 10min, the paraffin after solidification, paraffin-like particles with a digital camera macro distribution agglomerated particles using optical microscope observation group the condensed state.
2 Results and discussion analysis of 21 paraffin-like digital photo no glass particles in the ultrasonic treatment liquid paraffin, natural dispersion during solidification, particle-particle condensate group, evenly distributed. The paraffin liquid subjected to ultrasonic treatment, the PMMA particles obvious coagulation corporation phenomenon. When the ultrasonic power 30W, between the particles and the particles move closer to each other, and gradually into the group. When the power is further increased, reaching 375W, clumps the size of the larger trend of enhanced coagulation group. With a further increase of the power reaches 45W can be seen in the experiment with a small amount of cavitation bubbles generated due to the cavitation effect of ultrasonic waves, coagulation corporation clumps were broken, so that the size of the agglomerates decreases, plexiglass particles attached to the cavitation bubbles, coagulation group. Ultrasonic power is further increased to 525W, paraffin-like a large number of cavitation bubbles, bubbles larger than before, the clumps were broken up further, reduce the size of the clumps. The agglomerate size varies with the trend of power.
22 microstructure morphology analysis of the microstructure morphology as shown. It can be seen that the particles together, the particle coagulation corporation toward visible changed with the variation of the ultrasonic treatment time and power, the size of the agglomerates and the particle coagulation corporation toward specific phenomena, such as shown in.
Can be seen from FIG particles agglomerate with power changes, beginning no clumps, after the power is increased, the particles began to gather to form small clumps, but the degree of condensation of the briquettes is not close, not dense clumps of particles . Power continues to increase, the the particle agglomerates condensation integrally, binding occurs between the connector bridge, small clumps and small clumps clumps and agglomerates to form larger clumps, to increase the density of the agglomerates.
With a further increase in power, due to ultrasonic cavitation, the solution was agitated to accelerate severe vibration, large clumps are gradually broken up into small clumps, clumps of reduced area, a connecting bridge between the agglomerates and lumps disappear. separate small particles mass.
23 agglomerate particle size data are shown in the paraffin in the sample with the change of power with time particle agglomerates experiment.
The particle size of the agglomerates of the particles with a peak power variations exist, i.e. the average maximum diameter of the particle agglomerates optimum particle agglomerates with the ultrasonic treatment time and the power curve of the aggregate power, under the test conditions corresponding to a power of 375W .
In this power level, the same ultrasonic cohesion effect is greater than the effect of cavitation; cavitation effect is greater than the same direction cohesion effect at the top of this power. Therefore, to make the liquid in the particle agglomerates, the ultrasonic power exceeds the cavitation threshold, the particle agglomerates can also be achieved.
3 Conclusions (1) ultrasonic treatment under the processing time and power curves of PMMA particles in the liquid paraffin, the cohesion with the ultrasonic waves have a direct relationship to the length of the power of the size and processing time.
(2) ultrasonic treatment liquid paraffin particles, particle aggregation increased with increasing power, there is a peak, i.e. before the peak of the size of the particle coagulation corporation with increasing power increases, the size of the peak particle coagulation corporation with power large decrease. Particle agglomerates corresponding to the peak power of 375W.
(3) ultrasonic treatment liquid paraffin particles, the size of the particles coagulated lumps gradually with the passage of time becomes large, the agglomerate size is proportional to the time relationship.
(4) Ultrasonic cavitation hinder further growth of particle agglomerates.


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