Technical Transactions iss. 1. Mechanics iss. 1-M

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Collection items (25)


An evaluation of delamination in composite structures by Cooling Down Thermography (CDT): numerical studies

Pastuszak, Przemysław Daniel, Nering, Konrad
Article
2016
This paper is devoted to numerical studies of composite structures with delaminations made with the use of CDT. Analysis of temperature distribution provides the opportunity to determine the geometry of subsurface defects. Results confirm the validity of the FE model in comparison to previous experimental investigations.

The systematic design of CO2 capture rocesses applied to the oxidative coupling of methane

Penteado, Alberto, Esche, Erik, Salerno, Daniel, Godini, Hamid Reza, Repke, Jens-Uwe, Wozny, Günter
Article
2016
The oxidative coupling of methane is the catalytic conversion of methane into ethene. Carbon dioxide is generated as a reaction by-product and must be removed from the gaseous stream. In this paper, the application of a hybrid carbon dioxide removal process including absorption with amines and gas separation membranes is investigated through simulations and cost estimations.

Water jackets as efficient heat shields in high temperature difference cases – CFD modelling of convective and radiative heat transfer in vacuum systems

Kantor, Ryszard, Młynarczyk, Przemysław
Article
2016
Many experimental high-energy installations, e.g. ITER (Cadarache), CERN (Geneva), SOLARIS (Krakow), require an ultra-high quality of vacuum. To meet these requirements, a vacuum void and its adjacent diagnostic systems are exposed to elevated temperatures (baking) after assembly to outgas all volatile surface contaminants. The baking temperature peaks as high as 250°C for up to 24 hours.

Automated membrane reactors for the early process development of enzyme promoted bioconversion

Sitanggang, Azis Boing, Drews, Anja, Kraume, Mathhias
Article
2016
In general, there is always a trade-off between the information output and the process throughput. The automation of micro- to small-scale bioreactors is considered necessary as this can facilitate a straightforward bioprocess development to reach its commercial success. A small-scale, dead-end enzymatic membrane reactor system has been realised. Reactor system was tested for the continuous transgalactosylation of lactulose using commercial βgalactosidase.

Hydroformylation of 1-dodecene in microemulsions: operation and validation of lab results in a miniplant

Illner, Markus, Pogrzeba, Tobias, Schmidt, Marcel, Müller, David, Esche, Erik, Schomäcker, Reinhard, Repke, Jens-Uwe, Wozny, Günter
Article
2016
A method of hydroformylation to convert long- chained olefins, using tunable microemulsion systems, tests were conducted on a mini-plant at the center InPROMPT/TRR 63. Surfactant allowing a quasi-homogeneous reaction of olefin in aqueous Rhodium catalyst solution.

Automotive catalyst production – challenges for chemical engineers

Netušil, Michal, Ditl, Pavel
Article
2016
The goal of this paper is to explain the chemical engineering backgrounds for operations participating on catalyst production in the automotive industry. It is shown that chemical engineering knowledge can help to a better understanding and optimisation of the production process. Besides the contribution mentioned above this paper brings the description of the up to date and interesting technology developed and patented by the worldwide leader in the chemical engineering - BASF. The car catalyst production process consists of two steps. Firstly, the coating slurry is produced and secondly, it is applied to the substrate. This paper focuses on the slurry production especially with regard to its dispersion, mixing, particle size reduction, and the influence of parameters affecting this process.

Numerical simulation of viscoelastic fluid flow in stirred vessels

Kolano, Markus, Brehmer, Manuel, Kraume, Matthias
Article
2016
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.

CFD impulse flow simulation through shaped nozzles

Cyklis, Piotr, Młynarczyk, Przemysław
Article
2016
Pressure pulsations in volumetric compressor manifolds are important issues in the compressor plant operation. For pressure pulsation attenuation, mufflers designed using the Helmholtz resonator approach are applied. Nowadays, the variable revolution speed compressors requires new design methods for pressure pulsation damping elements. One of the possibilities to attenuate the pressure pulsations is the introduction of specially shaped nozzles in the gas duct flow. In this paper, the impulse flow simulations conducted in FLUENT/ANSYS. The experimental validation of the simulation results is also presented.

Simulation of the single bubble ascent with OpenFOAM

Böhm, Lutz, Kolano, Markus, Kraume, Matthias
Article
2016
This project is motivated by the challenge of cleaning flat sheet membrane surfaces with the help of aeration. On the basis of earlier experiments and CFD simulations, a decision was made to use the CFD-tool OpenFOAM in contrast to earlier simulations which were performed with Ansys Fluent. In the new simulations, the advancing computing power allowed the simulation of a bubble ascent in the full channel which is of special interest in cases where the bubble size is smaller than the channel depths. Besides saving the licensing cost, OpenFOAM allows access to the source code and, therefore, easier implementation of sub-models if necessary.

Flow structure, drop deformation and mass transfer in dense emulsions

Bałdyga, Jerzy, Jasińska, Magdalena
Article
2016
This paper presents applications of a new model of the rheological behaviour of dense oil-inwater emulsions of non-colloidal droplets to describe the flow structure, the effects of the flow of dense emulsion on drop deformation and the related increase of the interfacial area and the mass transfer rate.