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1

Experimental Study to Develop a Control System for Submersible Mixers in Biogas Plants

100%

Brehmer M., Kraume M.

Czasopismo Techniczne

|

-

PL

For developing a control system for these agitators, the analysis focused on the rheological characteristics of digestates, the open jet in non-Newtonian fluids and the flow conditions in a biogas reactor. In addition to a clearly visible shear-thinning effect, the viscoelastic proportion of these substrates was also determined. Depending on the stirrer speed and the rheology, the angle of spread varies and a reverse flow can occur directly at the stirrer. Therefore, not only can the position of the stirrer be used to optimise the flow field. The conical spreading of the liquid jet also enhance the mixing process. By using thrust measurements, their suitability as controlled process variables could be demonstrated.

2

Experimental Study to Develop a Control System for Submersible Mixers in Biogas Plants

100%

Brehmer M., Kraume M.

Czasopismo Techniczne

|

-

PL

For developing a control system for these agitators, the analysis focused on the rheological characteristics of digestates, the open jet in non-Newtonian fluids and the flow conditions in a biogas reactor. In addition to a clearly visible shear-thinning effect, the viscoelastic proportion of these substrates was also determined. Depending on the stirrer speed and the rheology, the angle of spread varies and a reverse flow can occur directly at the stirrer. Therefore, not only can the position of the stirrer be used to optimise the flow field. The conical spreading of the liquid jet also enhance the mixing process. By using thrust measurements, their suitability as controlled process variables could be demonstrated.

3

Numerical Simulation of Viscoelastic Fluid Flow in Stirred Vessels

81%

Kolano M., Brehmer M., Kraume M.

Czasopismo Techniczne

|

-

PL

In this work, a tool for calculating viscoelastic flows with rotating geometries in OpenFOAM based on the finite-volume method is presented. The tool combines the split-stress tensor approach and viscoelastic differential constitutive equations with the sliding-mesh technique. With this tool, a CFD simulation was run for a geometry of a spherical stirrer in an aqueous solution of carboxyl cellulose. Additionally, a rheological characterisation of that solution was conducted. For validation, the simulations were compared with flow field data acquired through particle image velocimetry measurements.

4

Numerical Simulation of Viscoelastic Fluid Flow in Stirred Vessels

81%

Kolano M., Brehmer M., Kraume M.

Czasopismo Techniczne

|

-

PL

In this work, a tool for calculating viscoelastic flows with rotating geometries in OpenFOAM based on the finite-volume method is presented. The tool combines the split-stress tensor approach and viscoelastic differential constitutive equations with the sliding-mesh technique. With this tool, a CFD simulation was run for a geometry of a spherical stirrer in an aqueous solution of carboxyl cellulose. Additionally, a rheological characterisation of that solution was conducted. For validation, the simulations were compared with flow field data acquired through particle image velocimetry measurements.

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4 Czasopismo Techniczne

4 2016

4 Brehmer M.

4 Kraume M.

2 Kolano M.

Experimental Study to Develop a Control System for Submersible Mixers in Biogas Plants

Experimental Study to Develop a Control System for Submersible Mixers in Biogas Plants

Numerical Simulation of Viscoelastic Fluid Flow in Stirred Vessels

Numerical Simulation of Viscoelastic Fluid Flow in Stirred Vessels