Fluids & Mechanics

The competences acquired in the last few years in the disciplines structural mechanics, particle technology and fluid mechanics have been pooled together in the cluster Fluids & Mechanics. The unique strengths of MCI are the interdisciplinary approaches and varied comprehensive methods such as the experimental verification of simulations or the application of control engineering concepts in mechanical systems. Nonetheless, it is of prevailing importance to find the most appropriate solution for the respective problem with regard on the general requirements.

Contact
Michael Kraxner
FH-Prof. DI Dr.-Ing. Michael Kraxner Head Research & Development +43 512 2070 - 1800This email address is being protected from spambots. You need JavaScript enabled to view it.

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Flow & Phase Evaluation

In the research area multiphase evaluation, a number of modern experimental and numeric processes are conducted to examine the fluids. The characterization of fluids with laser measurement techniques are the principal foci of the research projects. Based on the fluid properties and the online measurable properties of dispersed phase, the technically important flows in the process sequence are investigated and optimized to enable more efficient modes of operations.

 

Flow & Phase Evaluation

In the field of particle and separation technology the knowledge derived from fluid analysis is applied, for example, to optimize and especially to design particle separators. This research area focuses on particle separation through inertial separators especially with uniflow and reverse flow cyclones.

Owing to its compact construction the uniflow cyclone offers many advantages, and hence, is used in several technical applications for the separation of gas solids (e.g. the preliminary purification of intake air for internal combustion engines, FCC-plants, emission gas purification systems etc.). The precise manufacturing process through rapid prototyping, in combination with electronic probe analysis and a process evaluation enables research on different industrial applications.

 

Simulation Technology

The simulation technology forms the core of several MCI study programs and is, therefore, predominant in research areas such as mechanics (FEM, MBS), fluid mechanics (CFD, LB), electromagnetic and control engineering. Comprehensive and integrative simulation is of paramount importance in the light of the general orientation of this cluster. Commercial and industrial tested software as well as a high performance compute server form the backbone of the framework. Academic codes are also incorporated when required.

 

Dynamic Systems

In the research area multiphase evaluation, a number of modern experimental and numeric processes are conducted to examine the fluids. The characterization of fluids with laser measurement techniques are the principal foci of the research projects. Based on the fluid properties and the online measurable properties of dispersed phase, the technically important flows in the process sequence are investigated and optimized to enable more efficient modes of operations.

 

Research areas jpeg

Research areas at a glance

Entwicklung eines Kompaktluftfiltersystems für Holzbearbeitungsmaschinen
State:
Laufend

Start of project:
November 2015

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, since November 2015


Dipl.-Ing. (FH) Tobias Kofler
ProjektmitarbeiterIn, since November 2015


About the project:
In the processing of wood there are sometimes very fine dust fractions, which must be sucked by technical equipment from the processing center and subsequently separated from the transport gas. For this purpose, a combination separator consisting of centrifugal separators and fabric filters is being developed in the present research project. The aim here is the lowest possible pressure difference between pure and raw gas, so that the highest possible, legally compliant cleaning performance can be achieved at the lowest suction.

Auslegung und Entwicklung einer Zyklonzelle >60mm für den Bereich der Sonderanwendungen
State:
Abgeschlossen

Start of project:
März 2013

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from März 2013 until Dezember 2014


About the project:
For the field of special applications (for example, cleaning the intake air of combustion units, cleaning the cooling air of electric motors, etc.), a particle separator is to be developed. In this area of special applications mostly very high volume flows are to be expected, which is why the separator should be designed in a parallel and therefore very compact design. The maximum energy consumption and the minimum separation efficiency are specified by the project partner. In several sub-steps, pollinator tests according to ISO 5011:2000(E), a series-compatible separator is being developed.

Untersuchungen zu atypischen, zweistufigen Luftfiltern mit tangentialem Rohlufteintritt
State:
Abgeschlossen

Start of project:
Juni 2015

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from Juni 2015 until Dezember 2016


Martin Pillei, BSc MSc
ProjektmitarbeiterIn, from Juni 2015 until Dezember 2016


Tobias Frischmann, BSc
StudentIn, from Juni 2015 until Dezember 2016


Christian Mayerl, BSc, MSc
ProjektmitarbeiterIn, from Juni 2015 until Dezember 2016


About the project:
A two-stage filter, for use in construction, agricultural and working machines, consisting of a centrifugal separator and a fabric filter should be optimized with regard to the primary separation. Here, the maximum pressure loss and the achievable degree of separation are given. An essential part of the optimization concerns the measurements of the flow processes inside the primary separator, which are evaluated with laser-optical PIV measuring systems. Building on this, optimization potential can be raised and consequently implemented in several prototypes.

Holzfasertransport in einer Flugbeleimungszone
State:
Abgeschlossen

Start of project:
Dezember 2015

Project staff:
Magdalena Lindl, BSc, MSc
StudentIn, from Dezember 2015 until September 2016


FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from Dezember 2015 until September 2016


Martin Pillei, BSc MSc
ProjektmitarbeiterIn, from Dezember 2015 until September 2016


About the project:
To ensure a high quality of wood fiber boards, the process of fly gluing is essential. An incomplete gluing process usually results in considerable quality losses in quality of the wood fiber boards. In order to eliminate or minimize the sources of error, in this project the flow behavior of wood fibers in a converging flow zone is investigated and systematically illuminated with regard to an optimized gluing process.

Entwicklung eines automatisierten Partikelaustragssystems
State:
Abgeschlossen

Start of project:
Juni 2016

Project staff:
Christian Mayerl, BSc, MSc
ProjektmitarbeiterIn, from Juni 2016 until März 2018


Martin Pillei, BSc MSc
ProjektmitarbeiterIn, from Juni 2016 until März 2018


FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from Juni 2016 until März 2018


About the project:
Particle separators for keeping the process air clean in the field of process engineering must ensure continuous and safe transport of the separated particles from the filter element. In this case, independent of the pressure conditions in front of or behind the particle separator, it is necessary to develop a transport system which is as independent and resistant to interference as possible and which can be integrated into a series-production to competitive expense.

Simulationsunterstützte Vorhersage bei Nasenoperationen
State:
Abgeschlossen

Start of project:
Februar 2015

Project staff:
Manuel Berger, BSc MSc
ProjektleiterIn, from Januar 2015 until September 2016


About the project:
With the help of a flow simulation the success of a surgery should be predicted for patients with respiratory problems. The computer tomography is used as the basis for this. Patients with respiratory problems should get air-free after surgery with greater certainty and less surgical intervention.

Feinstaubdosierung für geringe Massenströme mit minimaler Pulsation
State:
Abgeschlossen

Start of project:
Januar 2016

Project staff:
Thomas Senfter, MSc
ProjektmitarbeiterIn, from Januar 2016 until März 2017


FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from Januar 2016 until März 2017


About the project:
At MCI, a novel dosing method for fine dusts has been developed in recent years, which finds application f.e., in the coating and air purification technology as well as in the energy production or food industry. Building on this development, the present project aims at producing a near-series prototype in order to facilitate the commercial exploitation by means of a patent. The new dosing unit will lead to improvements in the development of particle separators directly at the MCI and, in the long term, the developed patent will strengthen the technology location Tyrol.

Konzept zu einem optimierten Staubabscheider für die Holzindustrie
State:
Abgeschlossen

Start of project:
Juli 2014

Project staff:
Dipl.-Ing. (FH) Tobias Kofler
ProjektmitarbeiterIn, from Juli 2014 until März 2016


FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from Juli 2014 until März 2016


About the project:
Various types of production on woodworking machines such as milling, sawing, planing and more, not only produce the product but also waste in the form of cutoffs and fine wood shavings. The particularly small particles must be removed by a suction device by the operator and subsequently separated from the air flow. For optimal operation of such suction devices the maximum service life of the downstream fabric filter is sought in this project. For this purpose, different separator concepts are coordinated and combined.

Flugbeleimung in der Pressspanplattenproduktion
State:
Abgeschlossen

Start of project:
Februar 2016

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from Februar 2016 until September 2016


Martin Pillei, BSc MSc
ProjektleiterIn, from Februar 2016 until September 2016


About the project:
To ensure a high quality of wood fiber boards, the process of fly gluing is essential. An incomplete gluing process usually results in considerable quality losses in quality of the wood fiber boards. In order to eliminate or minimize the sources of error, in this project the flow behavior of wood fibers in a converging flow zone is investigated and systematically illuminated with regard to an optimized gluing process.

Beeinflussung der Partikelbewegung in Rauchgasen zur Reduktion der Staubemission
State:
Abgeschlossen

Start of project:
April 2015

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from April 2015 until Dezember 2016


Benedict Orterer, BSc MSc
StudentIn, from April 2015 until Juni 2016


Magdalena Lindl, BSc, MSc
StudentIn, from April 2015 until Juni 2017


About the project:
The historically shaped heating behavior by means of a tiled stove is a major cause of the proven poor air quality in the winter months in addition to the classical particulate matter emitters. Flue gas filter systems in domestic fireplaces are currently not available on the market due to the lack of financeable alternatives, which has kept the legislature apart from a prescribed flue gas cleaning system. The present project concept is intended to illuminate the influence of the particle movement in the flue gas, in particular of wood combustion systems. Here, possibilities for influencing the particle trajectory are investigated, which should facilitate the separation of particles in the flue gas, so that the particle emission can be significantly reduced.

Downstreamprocessing ARA - Störstoffabscheidung mittels Hydrozyklon
State:
Laufend

Start of project:
April 2015

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, since April 2015


Thomas Senfter, MSc
ProjektmitarbeiterIn, from April 2015 until März 2017


About the project:
In the sewage treatment process with co-fermentation in particular contaminants such as glass, sand and metal lead to undesirable loss of digester chamber volume due to sedimentation. Likewise, depending on contaminant properties and composition, increased wear on system components can be observed. To reduce these problems, an inline contaminant separation using a hydrocyclone will be investigated. For this purpose, in particular the geometrically optimal design of the hydrocyclone is systematically investigated. Another objective is the operating parameters (contaminant concentration, volume flow, pressure drop), which are to be determined for a maximum separation efficiency.

Untersuchungen zur Serienentwicklung eines regenerativen Zweistufenfiltersystems
State:
Laufend

Start of project:
September 2016

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, since September 2016


Christian Mayerl, BSc, MSc
ProjektmitarbeiterIn, since September 2016


Martin Pillei, BSc MSc
ProjektmitarbeiterIn, since September 2016


About the project:
Highly loaded filter elements in the field of application of construction and agricultural machinery have relatively short service lives due to the extreme conditions of use. For the extension of the useful life, a regenerative system is investigated in the present project, resulting in maximum useful life and effectiveness.

PIV-Measurements at a MAF-Sensor for Automobile Industry
State:
Abgeschlossen

Start of project:
Mai 2012

Project staff:
Martin Pillei, BSc MSc
ProjektmitarbeiterIn, from Mai 2012 until September 2012


FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from Mai 2012 until September 2012


About the project:
Stereoscopic flow profile measurement using PIV for the validation of simulation results on air mass sensors. Depending on the design of the intake tract of different types of vehicles, realistic conditions are simulated by means of faulty installations.

Untersuchungen zur Schwebestaubabscheidung in Abfallaufbereitungsanlagen
State:
Abgeschlossen

Start of project:
September 2014

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from September 2014 until Juni 2015


Ing. Andreas Volderauer, BSc
StudentIn, from September 2014 until Juni 2015


About the project:
In order to relieve the burden on the scrubber for cleaning the hall air from the waste treatment plant, the feasibility of a prebase separation by means of a centrifugal separator should be investigated. For this purpose, isokinetic samples are taken in advance from two exhaust air lines so that the proportionate volume flow distribution and the dust concentrations can be evaluated. Subsequently, the feasibility of an impurity separation by means of centrifugal separator is examined.

Selektive MoO3 Abtrennung
State:
Abgeschlossen

Start of project:
August 2017

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from August 2017 until März 2018


Martin Pillei, BSc MSc
ProjektmitarbeiterIn, from August 2017 until März 2018


About the project:
Investigations on the selective separation of molybdenum-containing dusts in various cyclone types and operating modes. The selective separation of MoO3-containing dust should provide as complete as possible a separation of 20µm particles in all investigated centrifugal separators, whereby the resulting pressure loss is to be kept low.

Untersuchung und Optimierung des Zyklonabscheiders eines Zweistufenfilters
State:
Abgeschlossen

Start of project:
April 2014

Project staff:
Martin Pillei, BSc MSc
ProjektmitarbeiterIn, from April 2014 until September 2015


FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, from April 2014 until September 2015


About the project:
A two-stage filter, for use in construction, agricultural and working machines, consisting of a centrifugal separator and a fabric filter should be optimized with regard to the primary separation. Here, the maximum pressure loss and the achievable degree of separation are given. An essential part of the optimization concerns the measurements of the flow processes inside the primary separator, which are evaluated with laser-optical PIV measuring systems. Building on this, optimization potential can be raised and consequently implemented in several prototypes.

Untersuchung der Rückreinigungsmechanismen und des Pulsmanagements eines Rundfilterelementes
State:
Laufend

Start of project:
August 2017

Project staff:
FH-Prof. DI Dr.-Ing. Michael Kraxner
ProjektleiterIn, since August 2017


Martin Pillei, BSc MSc
ProjektleiterIn, since August 2017


Christian Mayerl, BSc, MSc
ProjektmitarbeiterIn, since August 2017


Tobias Frischmann, BSc
ProjektmitarbeiterIn, from August 2017 until August 2018


Thomas Senfter, MSc
ProjektmitarbeiterIn, from September 2018 until Dezember 2018


Matthias Decker, MSc
ProjektmitarbeiterIn, from Oktober 2018 until März 2019


Thomas Hausberger, BSc, MSc
ProjektmitarbeiterIn, from Oktober 2018 until März 2019


Armin Lechner, BSc, MSc
ProjektmitarbeiterIn, from Oktober 2018 until März 2019


About the project:
In the field of special machines, which operate in the field of agriculture with very high dust concentrations in the ambient air, two-stage filters are used. To increase the service life similar to the industrial application, re-purifying filter systems are expedient. The objective of this project is to investigate the mechanisms for re-purification in a mobile application with the aim of the best possible service life and clean air quality.


  • Kraxner, M., Skarke, B., Kofler, T., Pillei, M., Pressure Drop in Uniflow Cyclones: Investigations on an Empirical Model. CFB11 - International Conference on Circulating Fluidized Beds and Fluidized Bed Technology, Beijing CHN, 2014, ISBN 978-7-122-20169-0 (p. 917 ff.)
  • Pillei, M., Kofler, T. and Kraxner, M., A swirl generator design approach to increase the efficiency of uniflow cyclones. LXLASER2014, 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon PRT, 2014, (p. 3.4.1 f.)
  • Mehrle, A.H. (2008). Vortex Diffuser Design. Saarbrücken: VDM Verlag.
  • Puttinger, S., Mehrle, A.H., Gittler, P., Meile, W. (2011). Numerical Optimization and Experimental Investigations on the Principle of the Vortex Diffuser. Journal of Aircraft, 48 (3), 845-854. doi:10.2514/1.C031013
  • Kraxner, M., Lauterbach, F., Muschelknautz, U., PIV-measurements of a vortex breakdown. CFB10 - International Conference on Circulating Fluidized Beds and Fluidized Bed Technology, Sunriver / Oregon USA, 2011, ISBN 978-1-4507-7082-8

  • Pillei, M., Kofler, T., and Kraxner, M., Investigations to the Particle Movement inside Swirl Vanes to Increase the Separation Efficiency of Uniflow Cyclones. AIChE - American Institute of Chemical Engineers - Annual Meeting, Atlanta / Georgia USA, 2014
  • Pillei, M., Kofler, T., and Kraxner, M., Untersuchung des Strömungsverlaufes im Abscheideraum eines Gleichstromzyklons mit 3C-PIV und CFD, GALA-German Association of Laser Anemomentry, Fachtagung: Lasermethoden in der Strömungsmesstechnik, KIT - Karlsruhe GER, 2014, ISBN 978-3-9816764-0-2 (p. 29 ff.)
  • Kraxner, M., Portenkirchner, M., Brugger, T., Muschelknautz, U., Effective Flow Rates for Uniflow Cyclones Performance. CSChE - 62nd Canadian Chemical Engineering Conference, Vancouver / BC, CAN, 2012
  • Kofler, T., Pillei, M. and Kraxner, M., Separation Effects within the Vortex Finder Zone of an Uniflow Cyclone. AIChE - American Institute of Chemical Engineers - Annual Meeting, Salt Lake City / Utah USA, 2015
  • Kraxner, M., Portenkirchner, M., Pillei, M., Kofler, T., Muschelknautz, U., Empirical Erosion Tests: Uniflow Cyclones as an Alternative to Reverse Flow Cyclones for longer Life Time? AIChE - American Institute of Chemical Engineers - Annual Meeting, San Francisco / California USA, 2013

  • Patent Nr. WO002013092315
  • Patent Nr. DE102015003754
  • Patent Nr. DE112012005362
  • Patent Nr. US020140298761
  • Patent Nr. DE102015008525

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