ESR/PhD Positions

EARLY STAGE RESEARCHER / PHD POSITION

at Helmholtz Zentrum Dresden-Rossendorf

Wire-mesh sensors for controlled inline fluid separation
Reference number: TOMOCON-ESR1

Inline fluid separation is an efficient way to split fluid mixtures via density-based centrifugal separation in a pipe. The PhD candidate shall develop wire-mesh imaging sensor technology towards integration into control of inline fluid separation systems. This comprises development of integrated and robust sensor front-ends as well as fast data processing software with implementation on parallel processor architectures. Special focus will be given to the detection and characterization of emulsions in liquid-liquid flows and electrostatic actuation to break such emulsions. The work comprises fundamental scientific analyses, engineering design and technical demonstration together with groups at universities Delft, Toulouse and Lodz and different industry partners. The PhD candidate will spend secondments of few months in total for technical and scientific training at TOTAL (France), CERG Fluides (France), Technical University Lodz (Poland) and Technical University of Delft (The Netherlands). The PhD degree will be awarded by Technische Universität Dresden, Germany.

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EARLY STAGE RESEARCHER / PHD POSITION

at Helmholtz Zentrum Dresden-Rossendorf, Germany

New concepts for control in continuous casting using electrical and magnetic tomography
Reference number: TOMOCON-ESR2

95% of the world’s steel output is produced by continuous casting. In order to demonstrate the capability of tomographic sensors for the control of continuous casting, the PhD candidate shall enhance an existing model of a continuous caster, which is available at Helmholtz-Zentrum Dresden-Rossendorf, with several actuators and with two tomographic sensors. One of them will be based on a combination of electrical capacitance and mutual inductance tomography, which will be developed at the University of Bath, the other one will be based on the contactless inductive flow tomography (CIFT). Beside the realization of the control loop for this demonstrator, the PhD candidate shall adapt CIFT for this particular setup and develop a real time reconstruction algorithm. The work comprises fundamental scientific analyses, engineering design and construction of a technical demonstrator together with groups at universities Delft, Bath and Liberec and different industry partners. The PhD candidate will spend secondments at Primetals (Austria), Tata Steel Europe (The Netherlands), University of Bath (UK), and Technical University of Liberec (Czech Republic) for technical and scientific training. The PhD degree will be awarded by Technische Universität Dresden, Germany.

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EARLY STAGE RESEARCHER / PHD POSITION

at Chalmers University of Technology, Sweden

Human-Computer Interaction with Application on Industrial Tomography
Reference number: TOMOCON-ESR3

Process tomography provides rich data but new control methodologies are needed if these data are to be used for real-time control. Human-computer interaction (HCI), information visualization, big data algorithms, and human cognition are all disciplines needed to tackle such challenges. The PhD candidate will develop a novel methodology based on image data reduction and perceptual visualisation to present process information to operators. This will include selecting and evaluating suitable visualization tools, formats, and architectures. The candidate will also develop concepts for multi-parametric and multimodal data visualisation of different tomographic modalities. Finally, the PhD candidate will demonstrate the efficiency of this approach within TOMOCON for microwave drying processes. The PhD candidate will spend secondments of about eight months in total for technical and scientific training on: microwave technology at Karlsruhe Institute of Technology (KIT), Germany, thermal processing in industrial production at Pinta Elements GmbH, Germany, industrial control and X-ray techniques at Siemens AG, Germany, and on system integration and demonstration of controlled microwave drying in the HEPHAISTOS lab at KIT. The PhD degree will be awarded by Chalmers University of Technology, Sweden.

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EARLY STAGE RESEARCHER / PHD POSITION

at Delft University of Technology, The Netherlands

Optimized controlled inline fluid separation
Reference number: TOMOCON-ESR4

Bulk separation of multiphase flows is traditionally done via gravity settlers, however, these devices are bulky and costly. An alternative is to use compact inline swirling separators, which induce a swirling flow with centrifugal accelerations much larger than gravity, hence have the potential to achieve a more efficient separation. However, the swirling flow introduces other phenomena (e.g. unsteadiness and turbulence), which can also hinder the separation. Control of the complex swirling flow and its features can remove some of the drawbacks, turning inline separation into a viable alternative to the gravity settlers. The PhD candidate will investigate the swirling multiphase flow and apply control using tomographic sensors (e.g. wire mesh sensors) in the large-scale inline separator of Delft University. Both an experimental and a model-based approach are required to reach optimal control and to understand the response of the system to actuation. A database for model development will be generated and physically-based control models will be developed and tested. Strong cooperation with Helmholtz-Zentrum Dresden-Rossendorf (wire-mesh sensor) and University of Toulouse (two-phase flow simulations) is foreseen; part of the project is using the setup as a demonstrator for the entire TOMOCON network. The work comprises engineering design and construction of a technical demonstrator, performing experiments and obtaining reliable experimental data, fundamental understanding of the phenomena involved, and development of physically-based models. The PhD candidate will spend secondments of a few months in total, for technical and scientific training, at FRAMES (The Netherlands), LINDE (Germany), Technical University of Lodz (Poland), and Helmholtz-Zentrum Dresden-Rossendorf (Germany). The PhD degree will be awarded by Delft University of Technology, The Netherlands.

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EARLY STAGE RESEARCHER / PHD POSITION

at Delft University of Technology, The Netherlands

Advanced simulation of liquid melt flows in controlled continuous casting
Reference number: TOMOCON-ESR5

Steel production is an energy intensive process. Continuous casting of steel (metals in general) aims at high production speed at as low as possible energy usage. Stability of the flow in the casting process plays a vital role in product quality and process performance. Electromagnetic actuators can be used to control and stabilize the multiphase metal flow. Computational Fluid Dynamics (CFD) can play a vital role in understanding the interplay between fluid dynamics and electromagnetic forces. Moreover, it allows studying different actuator strategies. The PhD candidate will further develop our in house Magneto-Hydrodynamics code as well as the OpenFOAM modules, which will used to: (i) study the multiphase flow of metals in continuous casting and (ii) develop and test control strategies for these flows. In addition to the numerical aspects, the work also involves fundamental scientific analyzes and engineering design with groups at Helmholtz-Zentrum Dresden-Rossendorf, at the universities of Liberec and Lodz, and at different industry partners. The PhD candidate will spend secondments of few months in total for technical and scientific training at Tata Steel (The Netherlands), Technical University Lodz (Poland) and Technical University of Liberec (Czech Republic). The PhD degree will be awarded by Delft University of Technology, The Netherlands.

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EARLY STAGE RESEARCHER / PHD POSITION

at the Institut de Mécanique des Fluides de Toulouse, INPT, France

Hybrid CFD simulation of two-phase flow in inline flow splitters using VOF and Lagrangian models
Reference number: TOMOCON-ESR6

Inline fluid separation is an efficient way to split fluid mixtures via density-based centrifugal separation in a pipe. The PhD candidate shall develop two-phase CFD simulations of centrifugal separation where transitions from dispersed flow to separated swirling flow have to be properly described by CFD. Since full DNS simulations (using VoF or LevelSet) are not adapted for this class of problems, the PhD candidate will develop adapted numerical methods. A new hybrid approach coupling VoF/LevelSet and Lagrangian tracking of „sub-grid“ bubbles will be developed and tested against experiments from TUD and HZDR. Once validated, simulations will be performed to cover a wide range of process parameters as basis for virtual controller design and demonstration. The work comprises both high level CFD development and physical analyses of results, together with groups at universities Delft, Dresden and different industry partners. In particular, the PhD candidate will spend secondments of few months in total for technical and scientific training at SHELL (The Netherlands), FRAM (The Netherlands), Technical University of Delft (The Netherlands) and Technische Universität Dresden (Germany). The PhD degree will be awarded by Institut National Polytechnique Toulouse, France.

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EARLY STAGE RESEARCHER / PHD POSITION

at Karlsruhe Institute of Technology, Germany

Microwave drying of porous products with novel tomography-assisted moisture control
Reference number: TOMOCON-ESR7

Microwave heating technologies allow for efficient drying processes of porous products. Today, empirical methods, without knowing neither the initial nor the progressing moisture distribution, are used to optimize the process parameters.

The Ph.D. student will assess and develop novel concepts for inline tomography measurements. Target is the development of concepts showing the best possible performance in the measurement of the moisture distribution, and, at the same time, showing the lowest kind of electromagnetic interference with the high-power microwave heating system. The research work includes detailed theoretical studies on possible antenna/receiver concepts for microwave tomography measurements using 3D simulation tools. Starting from specific examples of drying processes a generalized method for dielectric characterization of porous materials as a function of the temperature and the moisture content shall be developed. Concepts shall be prepared for a suitable human-machine interface. Final target is to implement and validate the most promising concept in a continuous microwave assisted drying process in strong collaboration with the other scientific and industrial partners in the project. The Ph.D. candidate will spend several different secondments of about eight months in total for scientific and technical trainings at University of Eastern Finland, Chalmers University of Technology (Sweden), NETRIX (Poland) and Vötsch Industrietechnik (Germany).

The applicant will apply for and will finally receive his/her doctoral (Dr.-Ing.) degree in Electrical Engineering and Information Technology from the faculty of Electrical Engineering and Information Technology (ETIT) at the Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany.

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EARLY STAGE RESEARCHER / PHD POSITION

at the Lappeenranta University of Technology, Finland

Controlled batch crystallization with ultrasound actuation
Reference number: TOMOCON-ESR8

Batch crystallization is widely used in purification of sugars, nutrients, pharmaceuticals and fine chemicals. Tomographic measurement data throughout reactor volume offers ideal tools for robust control of crystal quality parameters. The PhD candidate will develop the tomographic measurement based on ultrasound or on EIT/ERT for analyzing antisolvent/precipitation crystallization data. The goal is to connect tomographic measurement of populations to process control system. Computational fluid dynamics including crystallization kinetics modeling can be used for comparison of measurement and model to verify tomographic sensor design. Mathematical modeling and numerical methods as well as some experimentation are used in every-day work. The target is also to make a demonstration according to the topic together with University of Technology Lodz (Poland), University of Bath (UK) and Technical University of Liberec (Czech). Índustry partner is Dupont (Finland). The PhD candidate will spend secondments of few months in total for technical and scientific training at Institut National Polytechnique de Toulouse (France), Technical University Lodz, University of Bath, and University of Liberec. The PhD degree will be awarded by Lappeenranta University of Technology, Finland.

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EARLY STAGE RESEARCHER / PHD POSITION

at Technical University of Liberec, Czech Republic

Control systems based a multi-parametric data and exemplary application to continuous casting control
Reference number: TOMOCON-ESR9

Process tomography provides rich data but new control methodologies are needed if these data are to be used for real time control. As image reconstruction is computationally demanding and ill-posed, approaches based on suitable process model parametrization or state estimation are more likely to succeed. The PhD candidate shall develop control methodology (-ies) appropriate for tomography data together with concepts to use raw data instead of reconstructed images. The methodology must take into account the significant uncertainty in tomography data and finally it shall be implemented and tested with the continuous casting process using the LIMMCAST facility available at Helmholtz-Zentrum Dresden Rossendorf (HZDR). The work comprises fundamental scientific analyses, engineering design and technical demonstration together with groups at HZDR, universities Delft and Bath and different industry partners. The PhD candidate will spend secondments of about eight months in total for technical and scientific training at HZDR (Germany), Chalmers University of Technology (Sweden) and Primetals Technologies (Austria). The PhD degree will be awarded by Technical University of Liberec, Czech Republic.

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EARLY STAGE RESEARCHER / PHD POSITION

at Lodz University of Technology, Poland

Qualification of ERT/ECT for real-time control of inline fluid separators
Reference number: TOMOCON-ESR10

Inline fluid separation is an efficient way to split fluid mixtures via density-based centrifugal separation in a pipe. The PhD candidate shall develop an electrical tomography imaging sensor technology towards integration into control of inline fluid separation systems. This comprises configuration and development of robust sensor front-ends with 2D/3D electrode layouts as well as fast data processing software based on observe-and-react architecture to control flow behaviour. Special focus will be given to the accurate online calculation of phase fraction distribution and dispersion states for liquid/liquid and liquid/gas two-phase flow, as well as extraction of meaningful parameters for actuator control (e.g. hollow vortex position, shape and size). The work includes fundamental scientific analyses, engineering design and technical demonstration together with groups in Delft, Dresden and Toulouse and different industry partners. The PhD candidate will realise secondments of few months for technical and scientific training at Roscole Ltd (Finland), Teletronic (Germany), Federal University of Technology – Parana (Brazil) and Technical University of Delft (The Netherlands). The PhD degree will be awarded by the Lodz University of Technology in Poland.

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EARLY STAGE RESEARCHER / PHD POSITION

at Lodz University of Technology, Poland

ERT TOMOGRAPHY FOR MEASURING THE CRYSTALLIZATION PROGRESS IN A BATCH REACTOR
Reference number: TOMOCON-ESR11

3D ERT is an appropriate tomography modality to non-invasively measure the progress of crystallization in a batch reactor volume. The PhD candidate shall develop new generation of 3D ERT sensor that meets the requirements of batch processes (e.g. electrode immersion, large tank size, 3D measurement) and achieves maximum spatial resolution for monitoring and diagnosis of batch crystallization processes. This comprises formulation of a concept to compensate for temperature sensitivity as well as a concept for prevention of crystallization fouling on electrodes via heated electrodes. Special focus will be given to the development, implementation and configuration algorithms for fast volumetric quantification of crystal size distribution and solids concentrations. Finally, the expected result is to control actuators using ERT data in a feedback loop. The work includes fundamental scientific analyses, engineering design and technical demonstration together with group in Lappeenranta and different industry partners. The PhD candidate will realise secondments of few months for technical and scientific training at Sulzer AG (Switzerland), Chalmers University of Technology (Sweden), Technical University of Liberec (Czech Republic) and Lappeenranta University of Technology (Finland). The PhD degree will be awarded by the Lodz University of Technology in Poland.

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EARLY STAGE RESEARCHER / PHD POSITION

at University of Bath, UK

A novel combined ECT/MIT sensor for controlled continuous steel casting
Reference number: TOMOCON-ESR12

Continuous casting is an important process within steel manufacturing process. This project aims at developing a metal flow imaging in continuous casting. The flow regime and phase distribution in the submerged entry nozzle is decisive for the behaviour of argon bubbles and induced turbulence and buoyancy in the mould. Measurement of such has not yet been achieved and needs a combined tomographic imaging approach, because there is no unique measurement technique that can resolve the outer interface as well as small and fast bubbles in the liquid metal bulk with sufficient accuracy. Both Magnetic induction tomography (MIT) and electrical capacitance tomography (ECT) have great potential for such and application, and in particular their combination. Hence, we propose a novel combined MIT/ECT for such.

The PhD candidate will spend secondments of few months in total for technical and scientific training at HZDR (Germany), Rocsole Ltd (Finland), Primetals Technologies (Austria), Technical University of Liberec (Czech Republic) and TATA Steel (The Netherland). The PhD degree will be awarded by university of Bath, UK.

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EARLY STAGE RESEARCHER / PHD POSITION

at University of Bath, UK

Ultrasound tomography for control of batch crystallization
Reference number: TOMOCON-ESR13

Ultrasound tomography (UST) has a potential to be a tool to monitor the progress of batch crystallization. It is already known from so-called ultrasound turbidity sensors for suspensions. However, UST need more development to achieve that level and has not been demonstrated. A crucial fact is penetration depth for given particle concentrations, which must be investigated. This project focuses on UST image reconstruction and its application and demonstration in crystallisation process. And acoustic field modelling is needed for forward problems and inversion techniques for UST image reconstruction in a various UST imaging mode. Particular demonstrations are aimed at ultrasound reflection tomography mode for solidification process.

The PhD candidate will spend secondments of few months in total for technical and scientific training at University Eastern Finland (Finland), Lodz University of Technology (Poland), Sulzer AG (Switzerland) and NETRIX (Poland). The PhD degree will be awarded by university of Bath, UK.

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EARLY STAGE RESEARCHER / PHD POSITION

at University of Eastern Finland, Finland

ECT sensor for moisture distribution measurement in controlled microwave drying
Reference number: TOMOCON-ESR14

Microwave heating is an attractive technology for drying porous materials for example in food and pharmaceutical industries. The doctoral student shall develop electrical capacitance tomography (ECT) towards integration into control of microwave drying processes. This comprises development of an ECT sensor for capacitance measurements of porous materials, software for estimating moisture content based on ECT images and development of process model and online optimal control for a real microwave drying process. The work comprises fundamental scientific analyses, software development and technical demonstration, together with groups at universities in Lodz (Poland), Chalmers (Sweden), Karlsruhe (Germany) and different industry partners. The doctoral student will spend secondments of eight months in total for technical and scientific training at Chalmers University of Technology (Sweden), Lodz University of Technology (Poland), Karlsruhe Institute of Technology (Germany), Netrix S.A. (Poland) and Pinta Elements GmbH (Germany). The PhD degree will be awarded by University of Eastern Finland, Finland.

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EARLY STAGE RESEARCHER / PHD POSITION

at University of Eastern Finland, Finland

Microwave tomography for control of microwave drying processes
Reference number: TOMOCON-ESR15

Microwave heating is an attractive technology for drying porous materials for example in food and pharmaceutical industries. Microwave tomography, on the other hand, provides a potential framework for estimating volumetric moisture content of porous materials during the microwave drying process. The doctoral student shall develop both the forward and inverse problem solvers for microwave tomography. The obtained tomographic image is used to estimate the volumetric moisture content of the target and this information is further applied in online optimal control of the microwave drying process. The work comprises fundamental scientific analyses, software development, and technical demonstration, together with groups at universities in Liberec (Czech Republic) and Karlsruhe (Germany) and an industry partner. The doctoral student will spend secondments of eight months in total for technical and scientific training at Technical University of Liberec (Czech Republic), Karlsruhe Institute of Technology (Germany) and Vötsch Industrietechnik GmbH (Germany). The PhD degree will be awarded by University of Eastern Finland, Finland.

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