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Another Scientist Position at HZDR (Dresden, Germany)

Posted by on 5 January 2016 Comments Off on Another Scientist Position at HZDR (Dresden, Germany)

Scientist position

at MHD Department, Institute of Fluid Dynamics

of Helmholtz-Zentrum Dresden – Rossendorf (HZDR)

 

Yet without a vacancy notice number, the following scientist position will soon be officially announced.

The MHD department at HZDR is looking for a scientist (f/m) for the modeling of liquid metal based stationary electricity storage systems (liquid metal batteries).

Liquid metal batteries are a promising candidate for future large scale storage of electricity from volatile sources as photovoltaic and wind power. Single cells consist of a three layer arrangement of two liquid metals and a molten salt sandwiched in between them, forming stable density stratification. Not only is the MHD of such devices rich and interesting but also their integration into tomorrow’s power grids poses a number of challenges.

You should have a university degree (diploma or MSc) in the field of power engineering, electrical engineering, physics, mechanical engineering or process engineering. Interdisciplinary thinking, the ability for independent scientific work and active communication skills are essential for a successful implementation of the project. Experience in the modeling of battery storage systems and the knowledge of energy management systems would be advantageously. A background in fluid mechanics, heat- and mass transfer and/or electrochemistry would greatly facilitate the detailed simulation of liquid metal batteries.

Your tasks will include:

  • the development of liquid metal battery models as building blocks in future energy systems based on volatile sources
  • the requirement engineering and conception of the network integration (electricity and heat) of liquid metal batteries
  • the participation in the definition of interfaces and the data base integration of the developed models
  • the participation in the numerical simulation of liquid metal batteries

For further information, please contact Tom Weier (t.weier@hzdr.de) or Sven Eckert (s.eckert@hzdr.de).

The position will soon be announced on the HZDR web-page with a related vacancy notice number. Once this is case, please submit your complete application (cover letter, CV, certificates,…) before February 15, 2016 via Online application https://www.hzdr.de/jobs.

Positions_at_HZDR_PDF

4 PhD positions at MHD Department at HZDR (Dresden, Germany)

Posted by on 21 December 2015 Comments Off on 4 PhD positions at MHD Department at HZDR (Dresden, Germany)

4 PhD positions

at MHD Department, Institute of Fluid Dynamics

of Helmholtz-Zentrum Dresden – Rossendorf (HZDR)

Bautzner Landstr. 400, 01328 Dresden, Germany

(https://www.hzdr.de)

 

HZDR invites applications for 4 PhD positions at the Department of Magnetohydrodynamics (MHD) of the Institute of Fluid Dynamics. For all positions we are looking for students with excellent skills and first experiences in the field of fluid mechanics. Prior knowledge of liquid metal MHD or CFD is welcome but not required. All positions will be available from 01.04.2016. The starting dates can be agreed upon individually.The employment contract is limited to three years. The weekly working time will be 75% of regular weekly working time according to the collective agreement TVöD. The salary is based on the collective agreement TVöD-Bund and will be in the range of 35000-40000 Euro per annum. The place of work is Dresden-Rossendorf.

PhD position #1 (Vacancy Notice No. 67E/2015)

Metal recovery from slags uses the top submerged lance technology (www.outotec.com) in which gas is injected into a slag melt via a submerged lance from above. In order to improve the energy and resource efficiency of the process, the announced position shall perform experimental modelling of this process. Extensive experiences exist at HZDR on the handling of the room-temperature model melt GaInSn. The work in frame of this position is a joint project of the Helmholtz Institute Freiberg (HIF) for Resource Technology with the Institute of Fluid Dynamics at HZDR which both belong to HZDR. The general goal is to bring together basic fluiddynamic methods with practically relevant resource technologies, and to transfer the results to industrial partners.

Requirements:

  • completed university education (master degree) in the fields engineering, physics or process engineering
  • knowledge in the field of fluid dynamics and measuring techniques for liquid metal flows
  • knowledge in the field of metallurgy is preferable

Tasks:

  • experimental modelling of the two-phase flow gas-slag using the room-temperature liquid metal GaInSn
  • measurement of the gas bubbles and the flow in the melt using available ultrasonic and X-ray measurement techniques
  • extension of the model experiments to include chemical reactions of the gas phase (oxygen added) with the metal melt and investigation of the mass transport of the resulting oxides. Alternatively injection of solid particles and measurement of their transport.

 

PhD position #2 (Vacancy Notice No. 68E/2015)

Fluid flow and the related heat and mass transfer occurring in the continuous casting of steel have a distinct influence on the efficiency of the process and the final product quality. Electromagnetic fields are already in use in the industry for the purpose of an efficient flow control. However, there is still a significant need of research for achieving a better understanding of the interaction between magnetic field and turbulent flow. Such knowledge is required for optimization of the process parameters. The PhD candidate shall conduct an experimental modeling of flow problems related to continuous casting of steel using low-melting point metal alloys. At HZDR there exist corresponding experimental facilities (LIMMCAST program) as well as suitable techniques for liquid metal flow measurements.

Requirements:

  • completed university education (master degree) in one of the following fields: fluid engineering, process engineering, foundry engineering or physics
  • knowledge in the field of fluid dynamics and measuring techniques for liquid metal flows
  • knowledge about metallurgical processes

Tasks:

  • experimental modeling of fluid flow and related transfer processes in the LIMMCAST facilities at HZDR using low-melting point metal alloys (GaInSn, SnBi)
  • application of ultrasonic techniques and inductive diagnostic methods for flow measurements
  • investigations of single and multiphase flows
  • investigations of the impact steady magnetic fields (electromagnetic brakes) and AC magnetic fields (electromagnetic stirrers) on the fluid flow

 

 

PhD position #3 (Vacancy Notice No. 69E/2015)

Metal recovery from slags uses the top submerged lance technology (www.outotec.com) in which gas is injected into a slag melt via a submerged lance from above. In order to improve the energy and resource efficiency of the process, the successful candidate for this position shall perform numerical simulations of this process. Extensive experiences exist at HZDR on the numerical simulation of complex two-phase flows. Experimental data and first numerical simulations of simplified water models are available from literature. The work in frame of this position is a joint project of the Helmholtz Institute Freiberg (HIF) for Resource Technology with the Institute of Fluid Dynamics at HZDR which both belong to HZDR. The general goal is to bring together basic fluiddynamic methods with practically relevant resource technologies, and to transfer the results to industrial partners.

Requirements:

  • completed university education (master degree) in one of the following fields: fluid engineering, process engineering, foundry engineering or physics
  • knowledge in the field of fluid dynamics and numerical simulation
  • knowledge about metallurgical processes

Tasks:

  • numerical simulation of a simplified water-air model using the Euler-Euler approach
  • simulations for liquid metal model experiments which are performed in parallel by another PhD student
  • transfer of the simulations to real slag melts in order to analyse dependencies on process parameters (geometry, submergence length, flow rates, etc.)
  • extension to include chemical reactions of the gas phase with the slag melt and/or the transport of solid particles in the melt

 

PhD position #4 (Vacancy Notice No. 70E/2015)

Metallic melts in industrial processes usually contain fine-dispersed particles (for instance oxides), which could have a detrimental effect on the mechanical properties of the final product. Such particles can be extracted by flotation. For that purpose gas bubbles will be injected into the melt in order to collect the impurities at the gas-liquid interface. The current project will investigate fundamental mechanisms which play an important role for the agglomeration of particles at the bubble surface. Another topic concerns the behaviour of particles in the vicinity of a propagating solidification front. The PhD candidate shall investigate the processes mentioned above by means of X-ray diagnostic techniques. The corresponding facilities and measuring techniques are available at HZDR.

Requirements:

  • completed university education (master degree) in the fields materials science, physics or process engineering
  • knowledge in the field of X-ray diagnostics and image processing, multiphase flows, solidification processes

Tasks:

  • experimental investigation of the behaviour of gas bubbles passing a particle-laden liquid metal
  • experimental investigation of the behaviour of particles at propagating solidification fronts
  • Application of X-ray radioscopy for process visualization
  • Application and further development of suitable algorithms for data analysis and subroutines for image processing
  • Investigation of the influence of electromagnetically driven flows on the particle behaviour

 

For further information on all positions, please contact Dr. Sven Eckert, Tel.: +49 351 260 – 2132 (s.eckert@hzdr.de) or Dr. Gunter Gerbeth, Tel.: +49 351 260 – 3480 (g.gerbeth@hzdr.de).

 

In any case, please submit your complete application (cover letter, CV, certificates,…) by January 31, 2016 via Online application https://www.hzdr.de/jobs using the above given Vacancy Notice Numbers.

PDF version:  Positions_at_HZDR_PDF

 

PhD Position at University of Greenwich, UK

Posted by on 3 October 2014 Comments Off on PhD Position at University of Greenwich, UK

PhD Studentship: 2014-2016

(PGRO Ref. VCS-ACH-12-14_2)

University of Greenwich, UK

 

Title: ‘Contactless acoustic wave generation in a melt by electromagnetic induction’

 

Description:

A new electromagnetic induction technique is being developed to produce ultrasonic vibration in liquid metal for grain refinement and nano-particle dispersion in metal matrix composites. The PhD student will assist in the development, testing and validation of the software to simulate the electromagnetic, induced sound and velocity fields. The student will have the opportunity to examine the feasibility of these concepts, supported by experiments performed by partners on the large scale EU project EXOMET (FP7-NMP3-LA-2012-280421). Knowledge in fluid dynamics, electrodynamics and programming skills (FORTRAN, Matlab) are required.

 

For further information please contact the supervisors: Prof Koulis Pericleous, k.pericleous@gre.ac.uk, or Dr Valdis Bojarevics, v.bojarevics@gre.ac.uk.

 For additional information about the studentship and links to the application form please go to: http://www2.gre.ac.uk/research/study/studentships 

 The application form should be completed and returned to: postgraduateresearch@gre.ac.uk and include: a comprehensive CV and a one page covering letter explaining your interest in the project and how it relates to past experience and present motivations. Attachments should be in PDF format. 

The closing date for applications is Noon 31st October 2014

 

Please see the original advert document here:  PhD advert Grenwich

PhD position on magnetohydrodynamic simulations, Geodynamo team, Grenoble, France

Posted by on 27 May 2014 Comments Off on PhD position on magnetohydrodynamic simulations, Geodynamo team, Grenoble, France

We would like to advertise, an opened PhD position in our Geodynamo team in Univ. of Grenoble (advisors: N. Schaeffer and David Cébron), on magnetohydrodynamic simulations.

Please, find the detailed PhD subject in the enclosed file.

Yours sincerely,
David

————-
David Cébron

Institut des Sciences de la Terre (ISTerre)
Grenoble, France
Tel: +33 (0)4 76 63 52 39 / +33 (0)6 63 37 45 64
http://www.isterre.fr/

PhD in numerical fluid mechanics on the transition to turbulence in flows with liquid and solid phases, application to the optimization of flowrate measurements in oil pipes. NEL/COVENTRY UNIVERSITY (UK)

Posted by on 24 April 2014 Comments Off on PhD in numerical fluid mechanics on the transition to turbulence in flows with liquid and solid phases, application to the optimization of flowrate measurements in oil pipes. NEL/COVENTRY UNIVERSITY (UK)

Applications are invited to apply for a 4-year PhD studentship in experimental fluid mechanics at the Applied Mathematics Research Centre, Coventry University (http://www.complexity-coventry.org/home/). The project is funded by the National Engineering Laboratory, who provides calibration services for flowmeters used in offshore oil extraction plants (www.tuvnel.com). Precisely measuring the quantity of oil extracted from wells is a major economical challenge for the oil industry. Current flowmeters rely on assumptions on the flow profile in pipelines, which are being challenged both by the multiphase nature of the flow and its transitional character. To measure flow rates more precisely, it is now necessary to characterize flow regimes in real time, and this demands a precise understanding of the transition between laminar and turbulent states in multiphase pipe flows.

Pipe flow is a classical problem in fluid dynamics. Its simplicity of form and importance to industry and engineering has invited research for well over 100 years. In the case of a single phase the problem is relatively well understood in terms of transient turbulence. Patches of turbulence can be observed once the nondimensional flow rate (Reynolds number) exceeds 2000. As the flow rate is increased, turbulence becomes easier to initiate and turbulent patches start to spread along the pipe. With the addition of solid particles to the flow, the picture becomes less clear. Despite the great importance of particulate flow to a range of real world problems from chemical engineering to food processing, our understanding of how solid-liquid multiphase flow behaves is relatively poor. In the case of fully developed turbulence, work has been done on the impact of particle size on turbulence intensity and particle distribution. Somewhat less has been done on the problem of intermittent turbulence, and turbulence transition. These questions need to be answered to be able to determine flow rate precisely from the signals delivered by standard flowmeters.

The doctoral student will be in charge of the numerical part of this work. Transitional particulate channel flow has previously been investigated, but only in the case of the small periodic boxes. That literature will inform the beginnings of this project as we seek to employ similar methods in initially periodic pipe flow before moving to non-periodic flow. Cutting edge ideas (exact solution finding, nonlinear transient growth, etc) from the classical transition problem will be applied to this new field. The work will be compared extensively to experimental work to validate the approach taken and the results will be used to obtain more precise measurements from current and future flowmeters.

This challenging problem offers a rare opportunity for high-profile fundamental research in fluid mechanics (typically expected to generate publications in leading journal such as Journal of Fluid Mechanics) with, at the same time, a direct application to a concrete industrial need.

Successful candidates are expected to hold a MSc or equivalent in fluid mechanics or a related discipline (Physics/ Engineering/ Mathematics) and experience of numerical coding. Abilities in this field will have been demonstrated at MSc level.  The student will receive a tax-free bursary in excess of approx. £13.5k per annum (approx £17kEuros). Please note that this position is available to EU citizens only. The position will be open until a suitable candidate is found.

To apply, please forward a CV and academic records to Chris Pringle (chris.pringle(at)coventry.ac.uk) or Alban Pothérat (alban.potherat(at)coventry.ac.uk). Informal enquiries are welcome. The position will remain open until a suitable candidate is found.

———————————
Alban Potherat
Coventry University
Applied Mathematics Research Centre