Search Results - "Karl Wirth"

Optimized polybutylene terephthalate powders for selective laser beam melting by Schmidt, Jochen, Sachs, Marius, Fanselow, Stephanie, Zhao, Meng, Romeis, Stefan, Drummer, Dietmar, Wirth, Karl-Ernst, Peukert, Wolfgang

“…Additive manufacturing processes like selective laser beam melting of polymers (LBM) are established for production of prototypes and individualized parts. The…”
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Attractive particle interaction forces and packing density of fine glass powders by Parteli, Eric J. R., Schmidt, Jochen, Blümel, Christina, Wirth, Karl-Ernst, Peukert, Wolfgang, Pöschel, Thorsten

“…We study the packing of fine glass powders of mean particle diameter in the range (4–52) μm both experimentally and by numerical DEM simulations. We obtain…”
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Production of spherical wax and polyolefin microparticles by melt emulsification for additive manufacturing by Fanselow, Stephanie, Emamjomeh, Seyed Ehsan, Wirth, Karl-Ernst, Schmidt, Jochen, Peukert, Wolfgang

“…Melt emulsification is a top-down approach that so far has been applied in the food industries (cf. homogenization of milk) and in pharmaceutical applications…”
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A novel process route for the production of spherical LBM polymer powders with small size and good flowability by Schmidt, Jochen, Sachs, Marius, Blümel, Christina, Winzer, Bettina, Toni, Franziska, Wirth, Karl-Ernst, Peukert, Wolfgang

“…Rapid prototyping has been applied so far in the production of special parts at low piece numbers. Currently, ‘rapid prototyping’ gradually is transferred to…”
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Influence of carbon-coated iron nanoparticles on the Raman spectrum of liquid ethanol by Kiefer, Johannes, Toni, Franziska, Wirth, Karl-Ernst

“…Raman spectroscopy is applied to study the interactions between carbon‐coated iron nanoparticles and ethanol. The spectra reveal changes in the vibrational…”
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Dynamics of fine grinding in a fluidized bed opposed jet mill by Koeninger, Benedikt, Hensler, Timo, Romeis, Stefan, Peukert, Wolfgang, Wirth, Karl-Ernst

“…Today the modeling of the process dynamics and the complex two-phase flows in mills still remain a challenging task. In this study the dynamic comminution…”
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Packings of micron-sized spherical particles – Insights from bulk density determination, X-ray microtomography and discrete element simulations by Schmidt, Jochen, Parteli, Eric J.R., Uhlmann, Norman, Wörlein, Norbert, Wirth, Karl-Ernst, Pöschel, Thorsten, Peukert, Wolfgang

“…[Display omitted] •Determination of packing fraction of copper, glass and zirconia particles.•Comparison of results from bulk density measurements, CT and…”
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Horizontal secondary gas injection in fluidized beds: Solid concentration and velocity in multiphase jets by Koeninger, Benedikt, Hensler, Timo, Schug, Sebastian, Arlt, Wolfgang, Wirth, Karl-Ernst

“…High speed gas injection through nozzles is used in fluidized bed technology for controlling particle size or adding a reactant. Experiments were carried out…”
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Solid distribution in fluidized and fixed beds with horizontal high speed gas jets by Koeninger, Benedikt, Koegl, Thilo, Hensler, Timo, Arlt, Wolfgang, Wirth, Karl-Ernst

“…High speed jet penetration in fluidized beds can be used for particle size control or comminution processes. Thus, particle breakage is determined by the…”
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Characterization of a downer reactor for particle rounding by Sachs, Marius, Friedle, Maximilian, Schmidt, Jochen, Peukert, Wolfgang, Wirth, Karl-Ernst

“…The gradual shift of rapid prototyping towards additive manufacturing (AM) implies higher demands on the available material. So far, most of the processes as…”
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Treatment of polymer powders by combining an atmospheric plasma jet and a fluidized bed reactor by Sachs, Marius, Schmidt, Jochen, Peukert, Wolfgang, Wirth, Karl-Ernst

“…This contribution addresses possibilities of plasma functionalization of different polymer particles to be used in additive manufacturing processes. The…”
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Positron emission particle tracking in fluidized beds with secondary gas injection by Hensler, Timo, Tupy, Martin, Strer, Timo, Pöschel, Thorsten, Wirth, Karl-Ernst

“…We apply positron emission particle tracking (PEPT) to a gas–solid fluidized bed with injection of a secondary gas through a centrally arranged nozzle and…”
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Coral Gardens Reef, Belize: An Acropora spp. refugium under threat in a warming world by Greer, Lisa, Curran, H Allen, Wirth, Karl, Humston, Robert, Johnson, Ginny, McManus, Lauren, Stefanic, Candice, Clark, Tara, Lescinsky, Halard, Forman-Castillo, Kirah

“…Live coral cover has declined precipitously on Caribbean reefs in recent decades. Acropora cervicornis coral has been particularly decimated, and few Western…”
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Assessing stress conditions and impact velocities in fluidized bed opposed jet mills by Strobel, Alexander, Köninger, Benedikt, Romeis, Stefan, Schott, Florian, Wirth, Karl-Ernst, Peukert, Wolfgang

“…[Display omitted] •Characterization of fluidized bed opposed jet mills by single particle probes.•Determination of relative particle velocities and effective…”
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Simultaneous Analysis of the Dispersed Liquid and the Bulk Gas Phase of Water Sprays Using Raman Spectroscopy by Schuster, Julian Jonathan, Siegler, Philipp, Guenther, Astrid, Wirth, Karl-Ernst, Braeuer, Andreas Siegfried

“…Currently, a comprehensive physical description of sprays is not possible, as the involved heat- and mass-transport mechanisms have not yet been understood…”
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Grinding in an air classifier mill — Part II: Characterisation of the two-phase flow by Toneva, Petya, Wirth, Karl-Ernst, Peukert, Wolfgang

“…Based on the insights about the air flow within the air classifier mill presented in the first part of the paper [1] the particle laden flow in the vicinity of…”
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Coral Gardens Reef, Belize: A refugium in the face of Caribbean-wide Acropora spp. coral decline by Greer, Lisa, Clark, Tara, Waggoner, Tanner, Busch, James, Guilderson, Thomas P, Wirth, Karl, Zhao, Jian-Xin, Curran, H Allen

“…Caribbean Acropora spp. corals have undergone a decline in cover since the second half of the twentieth century. Loss of these architecturally complex and…”
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Non-invasive investigation of the cross-sectional solids distribution in CFB risers by X-ray computed tomography by Hensler, Timo, Firsching, Markus, Bonilla, Juan Sebastian Gomez, Wörlein, Thorsten, Uhlmann, Norman, Wirth, Karl-Ernst

“…We apply X-ray computed tomography for non-invasive investigation of the distribution of solids over the cross-section of a pilot plant scale circulating…”
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Increasing flowability and bulk density of PE-HD powders by a dry particle coating process and impact on LBM processes by Blümel, Christina, Sachs, Marius, Laumer, Tobias, Winzer, Bettina, Schmidt, Jochen, Schmidt, Michael, Peukert, Wolfgang, Wirth, Karl-Ernst

“…Purpose – The purpose of this paper is to demonstrate the processability of cohesive PE-HD particles in laser beam melting processes (LBM) of polymers…”
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Classifier performance during dynamic fine grinding in fluidized bed opposed jet mills by Koeninger, Benedikt, Spoetter, Christian, Romeis, Stefan, Weber, Alfred P., Wirth, Karl-Ernst

“…[Display omitted] •Fine grinding in fluidized bed opposed jet mills leads to product accumulation.•The determined high solid load at the classifier leads to a…”
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