| With the development of condensed matter physics,biochemical analysis and other technologies,people began to take into account the impact of environmental factors on the experiment,resulting in no container handling technology.As the suspension technology is low cost,the effect is stable,so now the researchers turn their energy on the suspension,which acoustic suspension due to its large levitation,suspension stability,and no special nature of the suspended material requirements,so that its application areas continue to expand.In this paper,the methods and types of containerless treatment technology are analyzed from the process of non-container processing technology.By comparing the existing several kinds of containerless treatment technology,Ultrasonic Standing Wave Levitation is used as the technical means of this experiment.The development process and advantages of electromagnetic induction heating technology are introduced.The influence of sound frequency,temperature,gravity level and resonant tube shape on the ultrasonic radiation and the stability of standing wave suspension is analyzed from the principle of ultrasonic standing wave.Based on the influence of various factors,in this experiment,a piezoelectric ceramic ultrasonic transducer with a higher power is used.The natural frequency is 19330 Hz,and the maximum displacement after the two-stage horn is enlarged to meet the requirement.The experimental heating device uses high frequency electromagnetic solenoid induction heating tube.Electromagnetic solenoids due to the introduction of high-frequency AC will produce a magnetic field,the resulting magnetic flux through the metal body.An eddy current is formed inside the metal body,resulting in a high temperature by the Joule heat effect.The optimal design of the electromagnetic induction coil is analyzed,including the influence of the coil shape,turns,turns spacing and other factors on the high frequency induction heating.And then use the maxwell software to compare the impact of various factors on the coil,the final selection of the best parameters of the prototype.Based on the selected transducer and resonant tube and the electromagnetic solenoid,the ANSYS finite element model of the acoustic suspension device was established.The influence of the resonant tube with observation hole on the acoustic pressure of ultrasonic standing wave was analyzed,and determined the size of the observation hole.The finite element model of transient thermal analysis is established,and the influence of the resonant tube on the temperature of the suspended position at different temperatures is compared.The theoretical analysis is used to select the appropriate resonant tube temperature to carry out the experiment.The containerless melting experiment platform was designed to complete the non-vessel melting experiment of paraffin and pom material pellets under ultrasonic standing wave suspension.The suspension experiments of different suspended matter in different temperature state and different gravity level were performed.There is a comprehensive summary by comprehensive theoretical analysis and experiment;Finally,the paper puts forward some suggestions and ideas for the problems of the non-vessel melting experimental device designed which paves the way for the future research work. |
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