Characterization of oxygen mass transfer in bubble columns: development of optical-experimental and numerical Euler-Euler methods

在一个完整的设备的规模的气泡流的数值模拟是，目前，只有可能与欧拉-欧拉或欧拉-拉格朗日建模。对于这种流动的流体动力学特性存在许多研究，但是传质和混合仅在少数方法中被处理，特别是在同时化学反应的情况下。类似地，只有很少的实验方法在更大尺度上表征具有传质和化学反应的泡状流，这可以提供足够的时间和空间分辨率的数据。该项目的目的是进一步发展这种数值和实验方法，这可能有助于将传质研究提高到与流体力学相似的水平。特别是在柱中的混合和由此产生的化学反应和流体动力学的相互作用，这是特别重要的反应与中等速度，将在这个项目中处理。为此，将开发数值和实验方法，并通过与所获得的数据进行比较来验证。所有相关参数（转移组分的浓度、气泡尺寸和速度、液相速度）将以足够的空间和时间分辨率同时测量。数值部分还将比较文献中不同的传质模型。化学反应的影响将被检查的情况下，非瞬时反应，其中一部分的离析物将来到本体和只在那里反应，而不是在电影。在这种情况下，泡罩塔中混合的影响将是显著的。所提到的主题（混合，传质和化学反应和流体力学的相互作用）将由项目合作伙伴和实验数据wil作为边界条件和验证新模型。反过来，数值结果将有助于有效的实验规划和最相关的参数的浓度。

Numerical simulations of bubble flows at the scale of a complete apparatus is, for the moment, only possible with Euler-Euler or Euler- Lagrangian modelling. Many studies exist for the hydrodynamic characterisation of such flows, but mass transfer and mixing have only been treated in a minor number of approaches, especially in the case of simultaneous chemical reaction. Analogically, there exist only little experimental methods for the characterization of bubble flows with mass transfer and chemical reaction at a larger scale, which can deliver data with sufficient temporal and spacial resolution. The aim of this project is the further development of such numerical and experimental methods , which could help to bring mass transfer studies to a level comparable to that, common for hydrodynamics. Especially mixing in the column and the resulting interaction of chemical reaction and hydrodynamic, which is particularly important for reactions with moderate velocity, will be treated in this project. For this, numerical and experimental methods will be developed and validated by comparison with the obtained data. All relevant parameters (concentration of transfered component, bubble size and velocity, liquid phase velocity) will be measured simultaneously with sufficient spacial and temporal resolution. The numerical part will also compare different mass transfer models from literature. The effect of the chemical reaction will be examined for the case of noninstantaneous reactions, for which part of the educts will come to the bulk and only react there and not in the film. In this case the influence of mixing in the bubble column will be significant. The mentionned subjects (mixing, mass transfer and interaction of chemical reaction and hydrodynamics) will be treated by both project partners and the experimental data wil by used as boundary conditions and for validation of the new models. Reversly the numerical results will help for an efficient experimental planning and concentration on the most relevant parameters.