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Dive into the research topics where Stefan Puttinger is active.

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Featured researches published by Stefan Puttinger.


Journal of Dispersion Science and Technology | 2018

Investigation of droplet size distribution for liquid-liquid emulsions in Taylor-Couette flows

Reza Farzad; Stefan Puttinger; Stefan Pirker; Simon Schneiderbauer

ABSTRACT In this paper, we investigate oil-in-water emulsions in a Taylor-Couette flow. A high-speed camera was employed to record the formation of those emulsions, and image processing was used to obtain the diameter of the droplets. No surfactants were added in order to study the pure effect of the fluid dynamical forces on the droplets. The results for three different oil-in-water emulsions show that the Sauter mean diameter considerably depends on the local shear rate and the material properties and that the droplet size distribution follows a log-normal distribution. We, therefore, propose to express the Sauter mean diameter normalized by Prandtl mixing length in terms of a correlation, which is based on the Kolmogorov turbulence theory. This correlation subsequently depends on the local shear rate and the material properties such as viscosity, density, and interfacial tension. The predictions of the correlation show fairly good agreement with the experimental measurement the Sauter mean diameter. Finally, comparing the predictions of the correlation to the data presented by Eskin et al. [Chem. Eng. Sci. 161 36–47; 2017] shows excellent agreement in the case, where the droplets are larger than the Kolmogorov length scale. GRAPHICAL ABSTRACT


BHM Berg- und Hüttenmännische Monatshefte | 2013

A Glance on Turbulence Modelling in Simulating Bubble Stirred Ladle Flow

Stefan Pirker; Bernhard König; Stefan Puttinger; Marianne Doletschek; Harald Harmuth

Bubble stirred ladle flow is studied by means of multiphase simulations. In this study the role of turbulence modelling is discussed. Numerical simulation results reveal that turbulence modelling is crucial for the prediction of both, local and macroscopic flow characteristics. Consequently, a thorough and experimentally substantiated turbulence modelling is indispensable for picturing metallurgical transport phenomena.ZusammenfassungGasblasen gerührte Pfannenströmungen werden mithilfe Mehrphasensimulationen untersucht. In dieser Studie wird insbesondere die Rolle der Turbulenzmodellierung diskutiert. Numerische Simulationsergebnisse zeigen, dass die Wahl des Turbulenzmodells für die Vorhersage des sowohl lokalen als auch makroskopischen Strömungsverhaltens entscheidend ist. Folglich ist eine gründliche und experimentell abgesicherte Turbulenzmodellierung für die Vorhersage von metallurgischen Transportphänomenen unverzichtbar.


Aiche Journal | 2013

Comparative analysis of subgrid drag modifications for dense gas-particle flows in bubbling fluidized beds

Simon Schneiderbauer; Stefan Puttinger; Stefan Pirker


Powder Technology | 2013

Application of a hybrid Lattice Boltzmann–Finite Volume turbulence model to cyclone short-cut flow

Stefan Pirker; C. Goniva; Christoph Kloss; Stefan Puttinger; J. Houben; Simon Schneiderbauer


Chemical Engineering Journal | 2015

CFD modeling and simulation of industrial scale olefin polymerization fluidized bed reactors

Simon Schneiderbauer; Stefan Puttinger; Stefan Pirker; Pablo Aguayo; Vasileios Kanellopoulos


Procedia Engineering | 2015

Numerical Study of a Bi-disperse Gas-solid Fluidized Bed Using an Eulerian and Lagrangian Hybrid Model

Simon Schneiderbauer; Stefan Puttinger; Stefan Pirker


Powder Technology | 2013

Investigation of highly laden particle jet dispersion by the use of a high-speed camera and parameter-independent image analysis

Stefan Puttinger; Gerhard Holzinger; Stefan Pirker


Procedia Engineering | 2015

Inhomogeneous Segregation of Binary Mixtures in Fluidized Beds

Stefan Puttinger; Simon Schneiderbauer; Lukas von Berg; Stefan Pirker


Powder Technology | 2017

A Lagrangian-Eulerian hybrid model for the simulation of poly-disperse fluidized beds: Application to industrial-scale olefin polymerization

Simon Schneiderbauer; Stefan Pirker; Stefan Puttinger; Pablo Aguayo; Vasileios Touloupidis; Alberto Martínez Joaristi


Light Metals | 2012

Studies on Flow Characteristics at High-Pressure Die-Casting

Christian Chimani; Richard Kretz; Simon Schneiderbauer; Stefan Puttinger; Stefan Pirker

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Stefan Pirker

Johannes Kepler University of Linz

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Simon Schneiderbauer

Johannes Kepler University of Linz

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Lukas von Berg

Johannes Kepler University of Linz

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Andreas Brandl

Johannes Kepler University of Linz

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Andreas Schützenberger

Johannes Kepler University of Linz

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Bernhard Jakoby

Johannes Kepler University of Linz

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Bernhard König

Johannes Kepler University of Linz

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Bianca Wiesmayr

Johannes Kepler University of Linz

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C. Goniva

Johannes Kepler University of Linz

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Christian Chimani

Austrian Institute of Technology

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