微反应器中Taylor流的计算流体动力学研究：表面张力和接触角对传热传质的影响
Computational Fluid Dynamics Study of Taylor Flow in Microreactors:Investigating the Effect of Surface Tension and Contact Angle on the Heatand Mass Transfer
摘要：
与传统的多相过程相比，微流体技术提供了高效率的传热和传质以及低安全危害。微通道中的多相流通常被表征为泰勒流，其包括由液体段塞分离的细长微气泡。在本研究中，我们采用OpenFOAM CFD软件包，研究了微尺度系统中的表面张力和接触角对界面表面积和输运产率的影响。结果表明，接触角对体系的比表面积和气泡尺寸有显著影响，而表面张力对这些参数影响不大。此外，在较低的接触角下，流动可能变成泡状流动，从而影响液相中的传质系数$K_L$。目前的研究结果可以提高微反应器中的传质系数，同时避免热失控，热点和传统反应器的其他安全问题。
英文摘要：
Microfluidics technology offers high efficiency of heat and mass transfer and low safety hazards compared to conventional multiphase processes. The multiphase flow in the microchannels is usually characterized as Taylor flow that includes elongated microbubbles , separated by liquid slugs. In the current study, we employ OpenFOAM CFD package to investigate the effect of the surface tension and the contact angle on the interfacial surface area and transport yield in microscale systems. The results show that contact angle can significantly affect the surface area and the bubble size while the surface tension does not change these parameters in the system. Moreover, in lower contact angle, the flow may turn into bubbly flow, affecting $K_L$, mass transfer coefficient in the liquid phase. Findings of the current study can improve the mass transfer coefficient in microreactors while avoiding thermal runaways, hot spots and other safety issues of conventional reactors.
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