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氣流粉碎/靜電分散中粉體顆粒運動規(guī)律的數(shù)值模擬研究
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國家自然科學基金資助（51074129）；西北工業(yè)大學研究生創(chuàng)業(yè)種子基金資助（Z2012151）


Numerical Simulation of the Dynamic Process of Micropowder during Jet Milling/Electrostatic Dispersion
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    摘要:

    通過經(jīng)典力學及流體力學基本原理，建立軌道模型對氣流粉碎/靜電分散相復合制備超微粉體中粉碎分散倉內(nèi)顆粒的運動過程進行了數(shù)值模擬研究，揭示了氣流粉碎/靜電分散過程中粉體顆粒的運動規(guī)律。當荷電電壓為20 kV，射流速度較低時粉體顆粒流存在準穩(wěn)態(tài)層流流動現(xiàn)象；隨著射流速度的提高，粉體顆粒轉(zhuǎn)變?yōu)閺浬⒎植?，且分散性具有一定程度的提高；當荷電電壓增大?0 kV時，倉內(nèi)粉體顆粒的分散性有了進一步的提高，呈現(xiàn)出較好的均勻分散狀態(tài)。研究結(jié)果表明，增大射流速度和荷電電壓能夠有效的提高制備過程中粉體顆粒的分散性，且后者效果更為明顯。

    Abstract:

    Based on?the?fundamental?principle?of?classical mechanics?and?hydromechanics,?a particle-trajectory?model?was?established to simulate transport process?of?particles?in?J/E?chamber?during the?preparation?of?micropowder with a combination of jet milling and electrostatic dispersion techniques,?and?the law of kinetic?of the particles during?J/E?process?was revealed?as well.?When the charging voltage is?20 kV, the?grain flows?of micropowder present?laminar?flows of?quasi-steady-state?as?the?velocity of jet is low.?With the increase of jet velocity, the distribution of particles?transforms?into?dispersive?state,?and?the dispersion enhances to a certain extent. While when the charging voltage increases to 60 kV,?the dispersion of particles in the chamber?is further improved, which presents?a better evenly dispersed state.?The simulation of flow dynamics of the particles shows that?increasing the jet velocity and the charging voltage can improve?the dispersiveness of the powder during the transport process in?the?J/E?chamber, and the effect of the charging voltage is more?substantial.

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殷鵬飛,張 蓉,李銀冰,李 寧,申 朵,胡建昌.氣流粉碎/靜電分散中粉體顆粒運動規(guī)律的數(shù)值模擬研究[J].稀有金屬材料與工程,2014,43(12):3052~3057.[Yin Pengfei, Zhang Rong, Li Yinbing, Li Ning, Shen Duo, Hu Jianchang. Numerical Simulation of the Dynamic Process of Micropowder during Jet Milling/Electrostatic Dispersion[J]. Rare Metal Materials and Engineering,2014,43(12):3052~3057.]
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  • 收稿日期:2013-12-24
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  • 在線發(fā)布日期: 2015-04-16
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