Markus Schubert
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View article: Axially resolved measurement of axial gas dispersion in bubble columns via gas flow modulation technique
Axially resolved measurement of axial gas dispersion in bubble columns via gas flow modulation technique Open
The Gas Flow Modulation technique (GFM) is a recently introduced approach for measuring axial gas dispersion coefficients in bubble columns. This technique overcomes the limitations of the traditional tracer-based ap- proaches, enabling ax…
View article: X-ray measurements of gas distribution in a zero gap alkaline water electrolyzer
X-ray measurements of gas distribution in a zero gap alkaline water electrolyzer Open
X-ray radioscopy was used to measure the 2D projected dynamic void fraction in a zero/narrow gap alkaline water electrolyzer at a spatial resolution of 15μm, for narrow gap sizes up to 300μm and current densities up to 0.54 A/cm2. As expec…
View article: The Role of Speciesism and Social Dominance Orientation in the Brachycephalic Dog Breeding Paradox
The Role of Speciesism and Social Dominance Orientation in the Brachycephalic Dog Breeding Paradox Open
Paradoxically, despite increased recognition of extreme welfare issues, brachycephalic (flat-faced) dog breeding retains a social license to operate. Related psychological research suggests human attitudes consistent with speciesism and so…
View article: X-ray measurements of gas distribution in a zero gap alkaline water electrolyzer
X-ray measurements of gas distribution in a zero gap alkaline water electrolyzer Open
X-ray radioscopy was used to measure the 2D projected dynamic void fraction in a zero/narrow gap alkaline water electrolyzer at a spatial resolution of 15 $μ$m, for narrow gap sizes up to 300 $μ$m and current densities up to 0.54 A/cm$^2$.…
View article: A Unified Approach for the Prediction of Dry Pressure Drop in Knitted‐Wire Mesh Demisters
A Unified Approach for the Prediction of Dry Pressure Drop in Knitted‐Wire Mesh Demisters Open
The removal of unwanted droplets in thermal separation units is often accomplished using knitted wire meshes. Alongside the separation efficiency, the pressure drop plays a crucial role for the design of these demisters. Wire meshes have b…
View article: Inhalt: Chem. Ing. Tech. 6/2024
Inhalt: Chem. Ing. Tech. 6/2024 Open
study demonstrates the potential for using compartment models with creeping flow, providing scalable and accurate results across multiple points.. . . . . . . . . .
View article: Artificial Neural Networks for Gas‐Liquid Flow Regime Classification in Small Channels
Artificial Neural Networks for Gas‐Liquid Flow Regime Classification in Small Channels Open
The reliable design of multiphase micro‐structured apparatus requires a precise knowledge of the internal flow regime. Previous research indicated that classifiers based on artificial neural networks (ANN) are relatively simple to develop …
View article: New Approaches for Prediction of Flow Regime Boundaries and Overall Gas Holdups in a Bubble Column Operated with Aqueous Solutions of 2-Pentanol
New Approaches for Prediction of Flow Regime Boundaries and Overall Gas Holdups in a Bubble Column Operated with Aqueous Solutions of 2-Pentanol Open
The article reports a new approach for flow regime (FR) identification and a modified correlation for gas holdup prediction in a bubble column (BC) (0.1 m inner diameter) operated with aqueous solutions of 2-pentanol at ambient conditions.…
View article: Guidance for Measuring the Axial Gas Dispersion Coefficient in Bubble Columns via Gas Flow Modulation
Guidance for Measuring the Axial Gas Dispersion Coefficient in Bubble Columns via Gas Flow Modulation Open
The gas flow modulation technique (GFM) is a novel noninvasive approach for measuring the axial gas dispersion coefficient in bubble columns. The approach overcomes the limitations of traditional tracer-based techniques, qualifying it as a…
View article: Novel Identifier of Transitions in Bubble Columns Operated with Water and Aqueous Alcohol Solutions
Novel Identifier of Transitions in Bubble Columns Operated with Water and Aqueous Alcohol Solutions Open
The accurate identification of the transition velocities U trans in bubble columns (BCs) is important for their effective design, operation, and scale‐up. In this work, a novel parameter, namely, the new hybrid index (NHI), was developed a…
View article: Experimental Study of a Compact Microwave Applicator for Evaporation of Airflow-Entrained Droplets
Experimental Study of a Compact Microwave Applicator for Evaporation of Airflow-Entrained Droplets Open
In many energy and process engineering systems where fluids are processed, droplet-laden gas flows may occur. As droplets are often detrimental to the system’s operation, they need to be removed. Compact engineering solutions for the remov…
View article: Novel Mixing Relations for Determining the Effective Thermal Conductivity of Open-Cell Foams
Novel Mixing Relations for Determining the Effective Thermal Conductivity of Open-Cell Foams Open
This paper proposes a new approach to relate the effective thermal conductivity of open-cell solid foams to their porosity. It is based on a recently published approach for estimating the dielectric permittivity of isotropic porous media. …
View article: Modeling of the Effective Permittivity of Open-Cell Ceramic Foams Inspired by Platonic Solids
Modeling of the Effective Permittivity of Open-Cell Ceramic Foams Inspired by Platonic Solids Open
Open-cell solid foams are rigid skeletons that are permeable to fluids, and they are used as direct heaters or thermal dissipaters in many industrial applications. Using susceptors, such as dielectric materials, for the skeleton and exposi…
View article: 1 Crowdsourcing Facts in Conflicts
1 Crowdsourcing Facts in Conflicts Open
The unprecedented rise of mis- and disinformation surrounding conflicts around the globe poses an imminent threat to humanitarian assistance and conflict resolution. This paper reflects on previous approaches to harness the so-called “wisd…
View article: Hydrodynamic and efficiency data pertaining to an air-water column mockup (of 0.8 m internal diameter) equipped with sieve trays
Hydrodynamic and efficiency data pertaining to an air-water column mockup (of 0.8 m internal diameter) equipped with sieve trays Open
The hydrodynamic data including effective froth height, liquid holdup and tracer flow and patterns related to an operational sieve tray inside a 0.8 m diameter air-water column simulator are provided here. These data were obtained via an a…
View article: Flow Morphologies in Straight and Bent Horizontal Pipes
Flow Morphologies in Straight and Bent Horizontal Pipes Open
Two-phase flows in pipes develop characteristic patterns or flow morphologies. Their transport between process units and plant components often involves short pipes, large pipe diameters, as well as bends and curvatures. The prediction of …
View article: Two‐Phase Flow Morphology and Phase Fractions in Larger Feed Line Sections
Two‐Phase Flow Morphology and Phase Fractions in Larger Feed Line Sections Open
The design of industrial feed line sections and the selection of appropriate inlet devices requires knowledge about the two‐phase flow morphology and phase fractions in order to reduce costly overdesign. Since experimental data for two‐pha…
View article: Morphology of Flashing Feeds at Critical Fluid Properties in Larger Pipes
Morphology of Flashing Feeds at Critical Fluid Properties in Larger Pipes Open
Tailored conditioning and control of flashing feeds in industrial applications requires knowledge of the evolving flow morphology and phase fractions along the feed pipe. Design methods obtained from reference systems (e.g. water‐air) are …
View article: Direct Tray and Point Efficiency Measurements Including Weeping Effects through a Convenient Add-On for Air–Water Simulators
Direct Tray and Point Efficiency Measurements Including Weeping Effects through a Convenient Add-On for Air–Water Simulators Open
A direct approach for determining the tray and point efficiencies of an industrial-scale distillation tray is proposed. The stripping of isobutyl acetate from an aqueous solution with air was used, which is a manageable and nonhazardous me…
View article: Dataset for: Flow morphologies in straight and bent horizontal pipes (uncalibrated measurement files)
Dataset for: Flow morphologies in straight and bent horizontal pipes (uncalibrated measurement files) Open
This data set is a supplementory to 'Dataset for: Flow morphologies in straight and bent horizontal pipes'. In addition to the void files (.v) given in the primary data sets we provide: - Underlying uncalibrated measurements files (.dat, .…
View article: Dataset for: Flow morphologies in straight and bent horizontal pipes
Dataset for: Flow morphologies in straight and bent horizontal pipes Open
This data set contains gas phase fraction data (void files, v.) obtained from wire-mesh sensor recordings up and downstream of horizontal pipe bends. The test sections and experimental setups are explained in the correpsonding journal pape…