Fak. 3 Prozesswissenschaften

1243 Items

Recent Submissions
Verbesserung des CVB3-Maus-Myokarditismodells durch die Entwicklung pankreasattenuierter Coxsackieviren

Pryshliak, Markian (2019)

Das Coxsackievirus B3 (CVB3)-Maus-Myokarditismodell wird standardmäßig zur Untersuchung der Virus-induzierten Myokarditis verwendet. Entgegen der CVB3-Infektion im Menschen stellt im murinen Organismus nicht das Herz, sondern das Pankreas das für die CVB3-Infektion suszeptibelste Organ dar. Verschiedene klinische Symptome, wie der starke Gewichtsverlust, das schmerzhafte Hochziehen des Bauches ...

Effect of Different Drying Methods on Nutrient Quality of the Yellow Mealworm (Tenebrio molitor L.)

Kröncke, Nina ; Grebenteuch, Sandra ; Keil, Claudia ; Demtröder, Sebastian ; Kroh, Lothar ; Thünemann, Andreas F. ; Benning, Rainer ; Haase, Hajo (2019-03-27)

Yellow mealworm (Tenebrio molitor L.) represents a sustainable source of proteins and fatty acids for feed and food. Industrial production of mealworms necessitates optimized processing techniques, where drying as the first postharvest procedure is of utmost importance for the quality of the final product. This study examines the nutritional quality of mealworm larvae processed by rack oven dry...

Composition dependent transport diffusion in non-ideal mixtures from spatially resolved nuclear magnetic resonance spectroscopy

Pantoja, Christian F. ; Muñoz-Muñoz, Y. Mauricio ; Guastar, Lorraine ; Vrabec, Jadran ; Wist, Julien (2018-10-16)

Nuclear magnetic resonance (NMR) spectroscopy is a well-established technique for the measurement of intra-diffusion coefficients. Recently, such information has been used as a basis of predictive models to extrapolate to the Fick diffusion coefficient of liquid mixtures. The present work presents a new approach to directly access the Fick diffusion coefficient by spatially resolved NMR experim...

Diffusion Coefficients of a Highly Nonideal Ternary Liquid Mixture: Cyclohexane–Toluene–Methanol

Janzen, Tatjana ; Vrabec, Jadran (2018-10-26)

To better understand diffusion phenomena in highly nonideal ternary liquid mixtures, cyclohexane–toluene–methanol is studied by equilibrium molecular dynamics (EMD) simulation. Intradiffusion and Maxwell–Stefan (MS) diffusion coefficients, being strictly kinetic properties, are predicted by EMD over the entire composition range at ambient conditions. The thermodynamic contribution to the Fick d...

Kirkwood-Buff integration: A promising route to entropic properties?

Fingerhut, Robin ; Vrabec, Jadran (2018-12-13)

Kirkwood-Buff integration (KBI) is implemented into the massively-parallel molecular simulation tool ms2 and assessed by molecular dynamics simulations of binary liquid mixtures. The formalism of Krüger et al. (P. Krüger et al., J. Phys. Chem. Lett. 4: 235–238, 2013) that adopts NVT ensemble data to the μVT ensemble is employed throughout. Taking advantage of its linear scaling with inverse sys...

Diffusion limited evaporation of a binary liquid film

Chatwell, René Spencer ; Heinen, Matthias ; Vrabec, Jadran (2018-12-21)

An analytical solution of a model fluid’s time behavior, known as the Stefan problem, is presented. A scenario is investigated in which a planar two-component liquid film is continuously evaporating into a thermodynamically non-ideal vapor phase. Evaporation is initiated and maintained by a spatial chemical potential gradient, while its rate is limited by the components’ diffusion fluxes across...

Do ternary liquid mixtures exhibit negative main Fick diffusion coefficients?

Kozlova, S. ; Mialdun, Aliaksandr ; Ryzhkov, I. ; Janzen, Tatjana ; Vrabec, Jadran ; Shevtsova, Valentina (2019-01-07)

Experimental data on Fick diffusion coefficients of ternary and higher mixtures depend on the reference frame; those which are in common use are associated with the average velocity either with respect to volume, mass or mole number. In this study, the dependence of diffusion coefficients on the reference frame is thoroughly analyzed for three ternary mixtures of different types. The first one,...

Digitalization in Thermodynamics

Forte, Esther ; Jirasek, Fabian ; Bortz, Michael ; Burger, Jakob ; Vrabec, Jadran ; Hasse, Hans (2019-01-08)

Digitalization is about data and how they are used. This has always been a key topic in applied thermodynamics. In the present work, the influence of the current wave of digitalization on thermodynamics is analyzed. Thermodynamic modeling and simulation is changing as large amounts of data of different nature and quality become easily available. The power and complexity of thermodynamic models ...

Thermodynamic Speed of Sound Data for Liquid and Supercritical Alcohols

Javed, Muhammad Ali ; Baumhögger, Elmar ; Vrabec, Jadran (2019-02-28)

Because of their caloric and thermal nature, speed of sound data are vital for the development of fundamental Helmholtz energy equations of state for fluids. The present work reports such data for methanol, 1-propanol, 2-propanol, and 1-butanol along seven isotherms in the temperature range from 220 to 500 K and a pressure of up to 125 MPa. The overall expanded uncertainty varies between 0.07% ...

Efficient implementation of advanced molecularly-based equation of state models out of the documentation level

Merchan Restrepo, Victor Alejandro (2019)

Considering the increasing number of modern thermodynamic models for engineering applications and their continuously growing algebraic complexity, in the chemical process industry and research there is a high demand for methods and mechanisms that enhance the dissemination and reuse of these models in an efficient way. Experience shows that the common practice of providing model equations as a...

Bildung flüchtiger Verbindungen und Carbonsäuren in Modellsystemen unter Maillard-Bedingungen

Schibilsky, Stefan (2019)

Kommerziell hergestellte Lebensmittel unterliegen strengen Kriterien, damit eine für den Verbraucher gleichbleibende und hochwertige Qualität gewährleistet werden kann. Aroma und Geschmack sind wertgebende Eigenschaften von Lebensmitteln und für deren Qualitätsbeurteilung von erheblicher Bedeutung. Werden kohlenhydratreiche Lebensmittel thermisch prozessiert, kommt es aufgrund der Maillard-Reak...

Impact of TiO2 nanoparticles on the aquatic environment: Investigation of cyanobacterial toxin adsorption and oxidative stress mediated nanotoxicity towards the submerged aquatic macrophyte Hydrilla verticillata

Spengler, Annette (2019)

Manufactured TiO2-nanoparticles (TiO2-NPs) are the most commonly employed metal oxide-based NPs. Due to the greater surface area per unit volume compared with their respective microscale counterparts, TiO2-NPs might exhibit physicochemical properties which affect the toxicity potential of the normally inert material. Taking into account the increasing production volumes of TiO2-NPs, they will i...

Einfluss der Kompaktierung auf das Schäumverhalten von pulvermetallurgisch hergestellten Metallhalbzeugen

Neu, Tillmann Robert (2019)

Die Herstellung von metallischen Schäumen ist von vielen Einflussfaktoren abhängig. Bei der pulvermetallurgischen Herstellung der Schaumhalbzeuge spielt neben anderen Gegebenheiten auch die Kompaktierung eine wichtige Rolle. Um diesen Einfluss besser zu verstehen, wurden in dieser Arbeit Halbzeuge mit verschiedenen konventionellen Kompaktierungsvarianten (uniaxiales Pressen, Strangpressen und W...

Schädigungscharakterisierung an Faser-Kunststoff-Verbunden im Schwingversuch mittels Röntgenrefraktionstopographie unter Berücksichtigung der Matrixeigenschaften

Müller, Alexander (2019)

In the present thesis different epoxy resin systems were characterized. Two systems with different fracture mechanical properties were selected for the production of equivalent GFRP and CFRP laminates with fiber orientations in 0/90° and ±45°. These laminates were examined for their damage onset and their damage evolution characteristics in tensile tests and fatigue tests with a stress ratio of...

Experimental and numerical analysis of non-spherical particles in fluidized process/energy technology systems

Vollmari, Kevin (2019)

Fluid flow through a packing of granular material is commonly encountered in natural processes such as deep percolation of water, in industrial processes such as the movement of petroleum/natural gas through sand/rock in oil and gas extraction as well as in fixed and fluidized beds. Fixed beds are used among others for applications such as catalytic reactions, heat transfer, filtering, adsorpti...

DEM-Simulation der Trennkurven in Siebung und Gegenstromsichtung bei geringen Gutbeladungen

Spötter, Christian ; Elskamp, Frederik ; Hennig, Manuel ; Teipel, Ulrich ; Weber, Alfred P. ; Kruggel-Emden, Harald (2017)

Zur Abtrennung von Partikeln mit unterschiedlicher Größe sind in der Feststoffverfahrenstechnik trockene Klassierprozesse zur Herstellung von engen Fraktionen von großer Bedeutung. Um das Trennverhalten von Strömungs- und Siebklassierprozessen genauer vorhersagen zu können, wurden experimentelle Resultate mit DEM-Simulationen verglichen. Bei der Siebklassierung wurde der Einfluss der Partikelfo...

Extension of process models to predict batch screening results under the influence of moisture based on DEM simulations

Elskamp, Frederik ; Kruggel-Emden, Harald (2018)

Screening is a technical simple but still not fully understood process step, which can be used in a wide field of applications to separate bulk materials according to their particle sizes. A severe issue in screening technologies is that particles frequently prevail in moist conditions, due to effects related to the environment, the material or the process. This is often not preventable, althou...

DEM simulations of screening processes under the influence of moisture

Elskamp, Frederik ; Kruggel-Emden, Harald (2018)

In a wide field of applications, screening is required to separate bulk materials according to their particle sizes. Due to environmental, material or process related effects, particles frequently prevail in moist conditions, which is not preferred due to attractive forces altering the screening efficiency, but often not preventable. As for the design of dry screening processes detailed particl...

A strategy to determine DEM parameters for spherical and non-spherical particles

Elskamp, Frederik ; Kruggel-Emden, Harald ; Hennig, Manuel ; Teipel, Ulrich (2017)

In Discrete element method (DEM) simulations the choice of appropriate contact parameters is significant to obtain reasonable results. Particularly, for the determination of DEM parameters for non-spherical particles a general straightforward procedure is not available. Therefore, in a first step of the investigation here, methods to obtain the friction and restitution coefficients experimental...

Life cycle sustainability assessment at an automotive company

Tarne, Peter (2019)

Purpose: The assessment and improvement of sustainability impacts of products is integral to achieve sustainable development. A way to assess the impact of a product over its entire life cycle on all three dimensions of sustainability (environment, economy and society) is Life Cycle Sustainability Assessment (LCSA). LCSA suggests to carry out three complementary assessments: Life Cycle Assessme...