Hydrodynamik in Blasensäulen – Messung von relativem Gasgehalt und Blasengröße

In bubble column reactors mass transfer kinetics are determined by local hydrodynamic processes (bubble formation, velocity, coalescence, break‐up, etc.). For a better understanding of the influence of pressure and particle load on these processes, a measurement system for detection of local bubble size distributions in opaque bubbly flows is needed. Therefore, in this work an optical needle probe was applied in a bubbly flow. In a first step, the needle probe was validated by means of single‐bubble measurements. The measurement technique shows high potential for application in more complex and opaque systems.     

Emulgieren: Mehr als nur Zerkleinern

Emulsification: More than just Comminution Many products are emulsions, either as industrial intermediate, or as consumer designed products. From the micro‐structural point of view, emulsions are dispersed systems of at least two insoluble liquid phases. In order to design products according to target consumer needs, property, and process functions have to be known. This review gives an overview of emulsification basics based on the partial stages droplet disruption and coalescence. Emulsification machines and apparatus are described, property and process functions are given. Both, conventional emulsification applications and alternative processes using emulsions for the production of sub‐micron solid particles of modified product properties are described.