Modelling flow and mass transfer of thermal separation equipment constitutes one of the most challenging tasks in fluids process engineering. The difficulty of this task comes from the multiscale multiphase flow phenomena in rather complex geometries. Both analysis of flow and mass transfer on different scales as well as validation of models and simulation results require advanced experimental and measurement techniques. As a follow-up to intensive discussions during the 2019 Tutzing Symposium ''Separation Units 4.0'' a wide set of available modern experimental technologies is presented.

Sandwich packings, consisting of alternatingly stacked conventional structured packings with different geometric surface areas, are promising for increasing capacity and efficiency of separation columns. Film flow and froth flow evolve along a stack, which requires comprehensive fluid dynamic analysis. In particular, the froth height is an essential parameter to determine the spatial extent of the flow regimes. Ultrafast X‐ray tomography and a 3D‐printed pressure drop profile measurement module were applied to independently estimate this parameter. The results are compared with existing correlations.

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Die Effizienz von Trennkolonnen für Fluidgemische kann durch die Anwendung von Anstaupackungen gesteigert werden. Dabei entstehen im Betrieb belastungsabhängige, in ihrer Trennwirkung unterschiedliche Regime. Um die Auswirkungen der einzelnen Strömungsregime in einem Modell erfassen zu können, werden sowohl Trennleistungsmessungen als auch tomographische Methoden verwendet. Ein Rate‐based‐Modell wird vorgestellt, in dem die heterogenen Strömungsformen in Anstaupackungen mittels geeigneter Korrelationen berücksichtigt werden. Das Modell wird anhand gemessener Daten zur CO2‐Absorption getestet.