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Optimum Design and Levitation Performance Study for Single-axis Acoustic Levitator

Author: FengDaSheng
Tutor: JiaoFeng
School: Henan Polytechnic University
Course: Materials Processing Engineering
Keywords: Uniaxial acoustic levitation Container processing Finite Element Analysis Acoustic radiation force
CLC: TB559
Type: Master's thesis
Year: 2007
Downloads: 33
Quote: 0
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Abstract


Acoustic levitation is an important containerless processing technology , it is able to obtain sustained microgravity environment , can be used for material container melting and solidification research , the physical parameters of the liquid measurement and biochemical analysis . Acoustic levitation technology, the advantages of the electromagnetic properties of the suspension sample requirements , and can handle the low melting point metal material . The status quo of the poor stability of the acoustic levitation weak and suspended by the basic principles of acoustic levitation analysis , developed two sets of single-axis acoustic levitation device : the acoustic levitation open device and tubular acoustic levitation device and optimization of the acoustic system and resonator structure is designed to improve the performance of acoustic levitation . The optimized acoustic levitation apparatus can easily achieve stable suspensions of the steel balls, ceramic balls, water droplets and other common solid or liquid material . Experimental Study of the suspension properties of the suspension apparatus of the different geometric parameters and found that the performance of the suspension with concave spherical reflector is significantly stronger than the planar reflector , and found that by optimization of the radius of curvature R of the concave spherical reflector and a sectional radius Rb can significantly improved acoustic levitation levitation force . Finite element model of the open tubular acoustic levitation , analysis of different geometric parameters of the suspension of the suspension device performance using numerical simulation and analysis of acoustic radiation force distribution in the vertical direction and the horizontal direction under different conditions , suspension of the sample position and the R , at the same time , also discussed in the gravity field conditions , the potential well of the sound field time average potential changes found time average sound field under conditions of gravity potential potential well significantly lighter , especially , when using planar reflector , the potential wells smaller trend is more obvious , the potential well close to the reflector has nearly disappeared . The numerical simulation analysis by the sound pressure distribution when using two resonator . The results showed that when the resonator with a planar reflector , the excited plane standing wave, the sound pressure in the radial direction is constant , can not produce the radial positioning force , does not have the suspension stability , but with the concave spherical reflector resonator sound pressure gradient , can be generated in the radial cavity , can produce the radial positioning force , which can significantly improve the suspension stability and suspending power .

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Ultrasonic Engineering > The application of ultrasound
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