Experimental investigation and modeling of local mass transfer rates in pure and contaminated Taylor flows

在自然界和大多数化学、生化、医学和环境工程的应用中，分子从一个相到另一个相(气/液或液/液)的传输在获得高产率和纯度方面起着主导作用。为了尽可能有效地在流体界面上使用这些传输过程，对局部现象的深入了解是必不可少的。这些将在泰勒流动的明确条件下，在直径为1毫米的圆形和方形毛细管中进行研究。为此，我们将用空间分辨率为5μm的微粒子图像测速仪测量局部速度场，用空间分辨率为5μm的激光扫描共聚焦显微镜测量局部浓度场，用空间分辨率为1 dBm的共聚焦双光子荧光技术测量液膜内的传质过程。我们将研究和模拟离子和阴离子表面活性剂对流体界面形状和局部传质性能的影响。有了空间分辨率前沿的测量技术和这一优先计划的数学优势，将有可能对流体界面的局部传质过程有新的见解。

In nature and most applications for Chemical, Biochemical, Medical and Environmental Engineering, the transport of molecules from one phase into another phase (gas/liquid or liquid/liquid) plays a dominant role to achieve high yields and purities. To use these transport processes at fluidic interfaces as efficient as possible a deep understanding of local phenomena is indispensable. These will be studied under well defined conditions in a Taylor flow, in circular and square capillaries with a diameter of 1 mm. Therefore local velocity fields will be measured by Micro-Particle Image Velocimetry and local concentration fields by Confocal Laser Scanning Microscopy with a spatial resolution of 5 μm. The mass transfer in the liquid film will be measured by a Confocal Two-Photon Fluorescence Technique with a spatial resolution of 1 μm. For mass transfer an oxygen/nitrogen pure water system will be used with a Ruthenium-complex as fluorescent dye. The impact of ionic and anionic surfactants on the shape and local mass transfer performance of fluidic interfaces will be investigated and modelled. With measurement techniques at the front edge of spatial resolution and the mathematical excellence of this priority program, new insights into local mass transfer processes at fluidic interfaces will be possible.