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T型微通道中液—液兩相流流動與混合過程分析
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國家自然科學基金青年基金項目(51505123)和河北省高等學校自然科學青年基金項目(QN2016101)


Hydrodynamics and Mixing Process Analysis of Liquid—Liquid Two-phase Flow in Microfluidic T-junction
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    摘要:

    為了揭示T型微通道中液液兩相流的混合特性,,采用數(shù)值模擬與實驗對液滴內(nèi)流體的動態(tài)混合過程進行了分析。研究結(jié)果表明:在液滴生成時,,旋轉(zhuǎn)擾動作用決定了液滴內(nèi)混合組分的初始分布,,是影響混合性能的關(guān)鍵因素,。旋轉(zhuǎn)擾動作用使液滴內(nèi)兩相界面發(fā)生旋轉(zhuǎn),混合組分位于液滴的前后部位,,從而在液滴內(nèi)循環(huán)流的作用下加強混合,。連續(xù)相流速是影響旋轉(zhuǎn)擾動作用的主要因素,,若連續(xù)相流速較小,液滴較長,,旋轉(zhuǎn)擾動作用不足以使液滴內(nèi)的組分充分混合,;若連續(xù)相流速較大,液滴較小,,旋轉(zhuǎn)擾動能夠在整個液滴范圍內(nèi)起到作用,,混合程度得到大幅提升。當連續(xù)相流速增大時,,液滴尺寸減小,,當Vo為0.04μL/min時,混合指數(shù)為0.82,,是Vo為0.005μL/min時混合指數(shù)的2倍,。

    Abstract:

    In order to reveal the characteristics of droplet mixing in a microfludic T-junction, the dynamic mixing process in droplet was studied by numerical simulations and experiments. The microfluidic chip was manufactured by soft lithography based on polydimethylsiloxane (PDMS), and the experiment phenomena of droplet formation and mixing process were analyzed with microscope system. The research results showed that the mixing efficiency was significantly influenced by the twirling effect which controlled the initial distributions of mixture during the droplet formation stage. While the droplet was separated from the dispersed phase in the junction region, the combined effect of viscous shear exerted by the continuous phase and the re-orientation of flow induced a vortex in the dispersed phase. As the two-phase interface in the droplet was rotated by the twirling effect, the mixed solutions were distributed to the front and back parts of the droplets. Therefore, the internal recirculation flow can bring in convection mechanism thus improving mixing. The twirling effect was noticeably influenced by the velocity of continuous phase. When the velocity of the continuous phase was slow, the twirling effect cannot distribute effectively for long droplets because of the large amount of fluid contained in the droplets. In contrast, the twirling effect appeared to be very effective for short droplets as the amount of fluid was small. When the flow velocity of the continuous phase was 0.04μL/min, the mixing index was 0.82, which was two times higher than that of the mixing index when the flow velocity of the continuous phase was 0.005μL/min. This study provided the insight of droplet formation and mixing performance inside the droplet in droplet-based microfluidics and it should be helpful for microdevice design and optimization.

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楊麗,張暉,王媛媛,程景萌,李姍姍. T型微通道中液—液兩相流流動與混合過程分析[J].農(nóng)業(yè)機械學報,2017,48(1):397-405. YANG Li, ZHANG Hui, WANG Yuanyuan, CHENG Jingmeng, LI Shanshan. Hydrodynamics and Mixing Process Analysis of Liquid—Liquid Two-phase Flow in Microfluidic T-junction[J]. Transactions of the Chinese Society for Agricultural Machinery,2017,48(1):397-405.

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  • 收稿日期:2016-06-14
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  • 在線發(fā)布日期: 2017-01-10
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