Search results for: Stefan Heinrich

Items from 1 to 20 out of 150 results

article

Optimizing raw material composition to increase sustainability in porcelain tile production: A simulation‐based approach

Carine Lourenco Alves, Vasyl Skorych, Agenor De Noni, Dachamir Hotza, more

Journal of the American Ceramic Society > 107 > 4 > 2110 - 2127

Reducing the environmental impact of porcelain tile production while maintaining cost‐effectiveness is challenging. This work introduced a novel modeling approach for optimizing a standard composition range comprising kaolinite (15–38 wt.%), illite (0–20 wt.%), quartz (20–40 wt.%), and feldspar (20–45 wt.%) to establish a robust composition interval for porcelain stoneware tiles. The proposed study...

article

Simulation of the mechanical behaviour of coated particles using DEM‐BPM

Wasif Safdar, Sonja Rotter, Maike Orth, Stefan Heinrich, more

PAMM > 23 > 3 > n/a - n/a

In previous years, research into the use of granular media as crash absorbers in a ship double hull has led to an increased interest in further optimisation to improve their energy absorption. One way is to add a coating layer on the outside surface of these particles. This work provides an introduction to the numerical modelling of coated particles to simulate their crushing behaviour. Depending...

article

CFD‐DEM Simulation of Superquadric Cylindrical Particles in a Spouted Bed and a Rotor Granulator

Philipp Grohn, Luca Schaedler, Aitor Atxutegi, Stefan Heinrich, more

Chemie Ingenieur Technik > 95 > 1-2 > 244 - 255

The fluidization behavior of cylindrical particles in a spouted bed was first investigated experimentally using a camera setup. The obtained average spouted bed height was used to evaluate the accuracy of different drag models in CFD‐DEM simulations with the superquadric approach to model the particle shape. The drag model according to Sanjeevi et al. showed the best agreement. With this model, cylindrical...

article

Influence of Process Parameters and Particle Size Distribution on Mechanical Properties of Tablets

Amine Ait Ouazzou, Yogesh M. Harshe, Vincent Meunier, Jan H. Finke, more

Chemie Ingenieur Technik > 95 > 1-2 > 168 - 177

The influence of the particle size distribution of maltodextrin powders with a dextrose equivalent level of 29 as well as two tableting process variables, namely the compression pressure and the dwell time, on the tensile strength, porosity, and pore size distribution of the final tablet was studied. The mechanical strength and porosity of the tablets are assessed in relation to the powder and process...

article

Experiments on the Dynamic Behavior of the Chemical Looping Combustion Process

Lennard Lindmüller, Johannes Haus, Stefan Heinrich

Chemie Ingenieur Technik > 95 > 1-2 > 136 - 142

The dynamic operation of thermal power plants becomes more and more important due to more diverse and volatile power sources. Load changes of biomass, bituminous coal and methane were conducted during six experimental runs in a chemical looping combustion pilot plant which combines power generation and CO₂ capture. The resulting step responses of the hydrodynamics and gas concentrations were compared...

article

Influence of Nozzle Parameters on Spray Pattern and Droplet Characteristics for a Two‐Fluid Nozzle

Kathrin Kramm, Maike Orth, Arne Teiwes, Jana Christina Kammerhofer, more

Chemie Ingenieur Technik > 95 > 1-2 > 151 - 159

In this study, a two‐fluid nozzle, as, e.g., used in fluidized‐bed or spray drying applications, is comprehensively characterized regarding the spray pattern and droplet size. To analyze the spray cone, the spray cone angle and the radial mass distribution of the nozzle were measured at varied liquid flow rate, spray air pressure, liquid insert bore diameter, and air cap position. Additionally, droplet...

article

Joachim Werther zum 80. Von der Wirbelschichttechnik zur Partikeltechnologie

Stefan Heinrich

Chemie Ingenieur Technik > 95 > 1-2 > 3 - 3

article

Process Design of a Multistage Drying Process via Flowsheet Simulation

Moritz Buchholz, Johannes Haus, Lukas Blesinger, Christian Riemann, more

Chemie Ingenieur Technik > 93 > 8 > 1287 - 1294

Multistage drying processes including spray drying and fluidized bed unit operations are challenging to design due to the dependencies of the preceding process steps. Flowsheet simulation offers the possibility to simulate a complete process by the application of suitable short‐cut models. In this contribution a novel model for a spray dryer based on a population balance approach is presented. Furthermore,...

article

Prediction of complexity and complications of laparoscopic liver surgery: The comparison of the Halls‐score to the IWATE‐score in 100 consecutive laparoscopic liver resections

Verena Tripke, Tobias Huber, Jens Mittler, Hauke Lang, more

Journal of Hepato‐Biliary‐Pancreatic Sciences > 27 > 7 > 380 - 387

Background The development of laparoscopic liver surgery is slower than in other disciplines. Two different scoring systems have been proposed to estimate difficulty of laparoscopic liver resections (LLR) preoperatively. The aim of this analysis was to compare these two scores in an independent patient cohort regarding the predictability of morbidity. Methods All LLRs performed between 01/2011...

article

COVID‐19 pandemic: implications on the surgical treatment of gastrointestinal and hepatopancreatobiliary tumours in Europe

N. F. Nevermann, K. H. Hillebrandt, S. Knitter, P. V. Ritschl, more

British Journal of Surgery > 107 > 9 > e301 - e302

article

Measurement of Residence Time Distributions in a Continuously Operated Spouted Bed

Swantje Pietsch, Michael Schönherr, Frank Kleine Jäger, Stefan Heinrich

Chemical Engineering & Technology > 43 > 5 > 804 - 812

Continuous gas‐solid processes are applied in many industries with particulate products, e.g. for granulation or coating. In this contribution, the residence time behavior in a continuously operated prismatic spouted bed was determined by applying an impulse of magnetizable tracer particles. Experiments were performed with the original configuration and with separation plates including mouse holes...

article

Contact Behavior of Microcrystalline Cellulose Pellets Depending on their Water Content

Philipp Grohn, Dominik Weis, Markus Thommes, Stefan Heinrich, more

Chemical Engineering & Technology > 43 > 5 > 887 - 895

Microcrystalline cellulose pellets for oral drug delivery are often produced by a combined wet extrusion‐spheronization process. During the entire process, the cylindrical as well as the spherical pellets are exposed to various stresses resulting in a change of their shape and size due to plastic deformation and breakage. In this work, the effect of moisture content of pellets on their mechanical...

article

PARTEC 2019 – Overcome the Challenges in Particle and Powder Technology

Stefan Heinrich

Chemical Engineering & Technology > 43 > 5 > 788 - 788

No abstract.

article

Resection of intrahepatic cholangiocarcinoma in elderly patients – is it reasonable?

Fabian Bartsch, Janine Baumgart, Verena Tripke, Maria Hoppe-Lotichius, more

BMC Surgery > 2019 > 19 > 1 > 1-9

Background Intrahepatic cholangiocarinoma (ICC) has a rising incidence in western countries. Often major or extended resections are necessary for complete tumor removal. Due to demographical trends the number of elderly patients diagnosed with ICC is rising accordingly. Aim of this study is to show whether resection of ICC in elderly patients is reasonable or not. Methods Between January 2008 and...

article

Opinions and use of neoadjuvant therapy for resectable, borderline resectable, and locally advanced pancreatic cancer: international survey and case-vignette study

Stefan Heinrich, Marc Besselink, Markus Moehler, Jean-Luc Laethem, more

BMC Cancer > 2019 > 19 > 1 > 1-9

Background Several new treatment options have become available for pancreatic ductal adenocarcinoma (PDAC), but the support for their use for resectable, borderline resectable and locally advanced PDAC is unclear. Methods A survey was distributed to the members of the European-African Hepato-Pancreato Biliary Association (E-AHPBA) and the pancreas group of the European Organization for Research...

article

Application of patient‐derived liver cancer cells for phenotypic characterization and therapeutic target identification

Darko Castven, Diana Becker, Carolin Czauderna, Diana Wilhelm, more

International Journal of Cancer > 144 > 11 > 2782 - 2794

Primary liver cancer (PLC) ranks among the most lethal solid cancers worldwide due to lack of effective biomarkers for early detection and limited treatment options in advanced stages. Development of primary culture models that closely recapitulate phenotypic and molecular diversities of PLC is urgently needed to improve the patient outcome. Long‐term cultures of 7 primary liver cancer cell lines...

article

Two-Stage Hepatectomy and ALPPS for Advanced Bilateral Liver Metastases: a Tailored Approach Balancing Risk and Outcome

Janine Baumgart, Florian Jungmann, Fabian Bartsch, Michael Kloth, more

Journal of Gastrointestinal Surgery > 2019 > 23 > 12 > 2391-2400

Background and Aim Two-stage hepatectomy (TSH) with or without portal vein ligation (PVL) or portal vein embolization (PVE) and associated liver partition and portal vein ligation for staged hepatectomy (ALPPS) are surgical strategies in the treatment of advanced colorectal liver metastases (CRLM). The role of each strategy is yet ill defined. The aim of this analysis is to share our center experience...

article

Surgical therapy of primary hepatic angiosarcoma

Verena Tripke, Stefan Heinrich, Tobias Huber, Jens Mittler, more

BMC Surgery > 2019 > 19 > 1 > 1-6

Background Primary hepatic angiosarcoma (PHA) is a rare tumor entity. Radical surgical resection is currently considered the best treatment choice. The aim of this analysis is to report our experience with surgery for PHA. Methods All resections of PHA from 01/2002 until 06/2017 were identified from our prospective institutional database. All cases were re-confirmed by a second pathologist. We analyzed...

article

Surgical Resection for Recurrent Intrahepatic Cholangiocarcinoma

Fabian Bartsch, Markus Paschold, Janine Baumgart, Maria Hoppe-Lotichius, more

World Journal of Surgery > 2019 > 43 > 4 > 1105-1116

Background Although after R0 resection of intrahepatic cholangiocarcinoma (ICC) recurrence is frequent, most guidelines do not address strategies for this. The aim of this study was to analyze the outcome of repeated resection and to determine criteria when repeated resection is reasonable. Methods Between 2008 and 2016, we consecutively collected all cases of ICC (n = 176) in a prospective database...

article

Novel production method of tracer particles for residence time measurements in gas-solid processes

Swantje Pietsch, Paul Kieckhefen, Michael Müller, Michael Schönherr, more

Powder Technology > 2018 > 338 > C > 1-6

In order to measure the residence time distribution (RTD) in continuous gas-solid processes tracer particles are used. In this contribution, a novel production concept for magnetizable particles has been developed and optimized. The process includes coating of a fraction of the investigated bed material with a magnetizable paint in a laboratory spouted bed. The coated particles fulfill the requirements...

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FLUIDIZED BED (10)
DISCRETE ELEMENT METHOD (9)
POPULATION BALANCE (9)
LOWER BOUNDS (8)
DRYING (7)
HEAT AND MASS TRANSFER (7)
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INITIAL VALUE PROBLEM (3)
LIQUID INJECTION (3)
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WEGA (3)
AEROGEL (2)
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COATING (2)
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MATERIALVERHALTEN (2)
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ORDINARY DIFFERENTIAL EQUATION (2)
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STOSSZAHL (2)
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INFONA - science communication portal

Search results for: Stefan Heinrich

Optimizing raw material composition to increase sustainability in porcelain tile production: A simulation‐based approach

Simulation of the mechanical behaviour of coated particles using DEM‐BPM

CFD‐DEM Simulation of Superquadric Cylindrical Particles in a Spouted Bed and a Rotor Granulator

Influence of Process Parameters and Particle Size Distribution on Mechanical Properties of Tablets

Experiments on the Dynamic Behavior of the Chemical Looping Combustion Process

Influence of Nozzle Parameters on Spray Pattern and Droplet Characteristics for a Two‐Fluid Nozzle

Joachim Werther zum 80. Von der Wirbelschichttechnik zur Partikeltechnologie

Process Design of a Multistage Drying Process via Flowsheet Simulation

Prediction of complexity and complications of laparoscopic liver surgery: The comparison of the Halls‐score to the IWATE‐score in 100 consecutive laparoscopic liver resections

COVID‐19 pandemic: implications on the surgical treatment of gastrointestinal and hepatopancreatobiliary tumours in Europe

Measurement of Residence Time Distributions in a Continuously Operated Spouted Bed

Contact Behavior of Microcrystalline Cellulose Pellets Depending on their Water Content

PARTEC 2019 – Overcome the Challenges in Particle and Powder Technology

Resection of intrahepatic cholangiocarcinoma in elderly patients – is it reasonable?

Opinions and use of neoadjuvant therapy for resectable, borderline resectable, and locally advanced pancreatic cancer: international survey and case-vignette study

Application of patient‐derived liver cancer cells for phenotypic characterization and therapeutic target identification

Two-Stage Hepatectomy and ALPPS for Advanced Bilateral Liver Metastases: a Tailored Approach Balancing Risk and Outcome

Surgical therapy of primary hepatic angiosarcoma

Surgical Resection for Recurrent Intrahepatic Cholangiocarcinoma

Novel production method of tracer particles for residence time measurements in gas-solid processes

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