Optische Diagnosemethoden und Erneuerbare Energien
Optische Diagnosemethoden und Erneuerbare Energien
Optische Diagnosemethoden und Erneuerbare Energien

Jakob Wagner

PhD student at the Doctoral Centre for Sustainability Sciences at h_da

ORCID
Research Gate
LinkedIn

jakob.wagner@h-da.de

Micro-mixing processes in turbulent free jet flows

MOTIVATION

As part of the investigation of micro-mixing processes in turbulent free jet flows, micro-mixing is understood as a process that brings chemical reactants into contact with each other at the smallest level. As a result, the proportion of parasitic reaction products in parallel or consecutive reactions can be reduced. This research aims to investigate the effects of using microinjectors for mixing at the molecular level on resource and energy consumption in chemical processes. For this purpose, both laser-optical diagnostic methods for in-situ characterisation of turbulent free jet flows and ex-situ investigation of reaction products using various common methods of chemical analysis technology are applied. Both the in-situ and ex-situ investigations are aimed at gaining a detailed understanding of mixture formation at the microscopic level and drawing conclusions about optimisation possibilities and limitations of micro-mixing in the turbulent free jet.

 

METHOD

The investigation of the micro-mixing processes is characterised by a special aspect compared to other ongoing ODEE projects: It takes place entirely in the liquid phase. For this purpose, a special optically accessible experimental setup was developed that allows the turbulent mixing of liquid reaction mixtures to be investigated using particle image velocimetry (PIV) and PLIF imaging (planar laser-induced fluorescence). In this context, injectors with different micro-nozzle geometries are assembled and, among other things, the influences of the respective geometry on the flow properties during operation are investigated at both macro and micro level. The properties are analysed using ex-situ methods such as dynamic light scattering (DLS), electron microscopy and various common spectroscopic and chromatographic methods of chemical analysis technology. In particular, the mixing method-dependent properties such as the mixing time or the product yield of suitable model reactions are analysed.

 

Optische Diagnosemethoden und Erneuerbare Energien

Jakob Wagner

PhD student at the Doctoral Centre for Sustainability Sciences at h_da

ORCID
Research Gate
LinkedIn

jakob.wagner@h-da.de

MOTIVATION

As part of the investigation of micro-mixing processes in turbulent free jet flows, micro-mixing is understood as a process that brings chemical reactants into contact with each other at the smallest level. As a result, the proportion of parasitic reaction products in parallel or consecutive reactions can be reduced. This research aims to investigate the effects of using microinjectors for mixing at the molecular level on resource and energy consumption in chemical processes. For this purpose, both laser-optical diagnostic methods for in-situ characterisation of turbulent free jet flows and ex-situ investigation of reaction products using various common methods of chemical analysis technology are applied. Both the in-situ and ex-situ investigations are aimed at gaining a detailed understanding of mixture formation at the microscopic level and drawing conclusions about optimisation possibilities and limitations of micro-mixing in the turbulent free jet.

 

METHOD

The investigation of the micro-mixing processes is characterised by a special aspect compared to other ongoing ODEE projects: It takes place entirely in the liquid phase. For this purpose, a special optically accessible experimental setup was developed that allows the turbulent mixing of liquid reaction mixtures to be investigated using particle image velocimetry (PIV) and PLIF imaging (planar laser-induced fluorescence). In this context, injectors with different micro-nozzle geometries are assembled and, among other things, the influences of the respective geometry on the flow properties during operation are investigated at both macro and micro level. The properties are analysed using ex-situ methods such as dynamic light scattering (DLS), electron microscopy and various common spectroscopic and chromatographic methods of chemical analysis technology. In particular, the mixing method-dependent properties such as the mixing time or the product yield of suitable model reactions are analysed.