Abstract:

The wavy vortex in the Taylor reactor has received widespread attention due to the existence of azimuthal waves and mass transfer between adjacent vortices. In the present study, a numerical study was developed for the wavy vortex flow in a Taylor reactor, of which the radius ratio was 0.83 and the aspect ratio was 46.07. Computational fluid dynamics (CFD) was utilized to investigate the flow field without and with an axial flow. The numerical predictions were compared favorable to the PIV measurements in the literature. The results suggested the azimuthal waves eliminated the axisymmetric of vortex structure, and resulted in the periodic variation of the vortex with the azimuthal position, including the vortex shape, position, and vortex vorticity. It also yielded the transient behavior of velocity. The introduction of an axial flow decreased the degree of the above periodic variation with the azimuthal position, changed the variation of the velocity with time, and stabilizes a more stable flow field. It was found the axial flow also affected the variation of tangential velocity with the time. The unsteady tangential velocity fluctuated with the vortex passage frequency and its higher harmonics.

Key words: Taylor reactor, azimuthal waves, wave height, wave spectra, vorticity

摘要：

泰勒反应器中的波状涡流因存在周向波和涡间传质而受到广泛关注。本文针对泰勒反应器（半径比为0.83，纵横比为46.07）中的波状涡流进行了数值模拟研究，采用计算流体力学（CFD）软件研究了无轴向流动和有轴向流动时的两种流场。结果表明，数值模拟与文献中的PIV实验结果具有较好的一致性。在波状涡流场中，周向波动的存在消除了涡的轴对称性，导致涡随周向位置的周期性变化，包括涡的形状、位置以及涡量等，这也引起了速度的瞬态行为。轴流的引入降低了涡的周期性变化程度，改变了速度的瞬时特性，也稳定了流场。同时还发现轴向流动也影响着切向速度随时间的变化，切向速度随漩涡通过频率及其高次谐波而振荡。

关键词: 泰勒反应器, 周向波动, 波高, 波谱, 涡量