Lorentz force velocimetry(LFV)is a noncontact technique for the measurement of velocities in hightemperature metal melts that is based on exposing the liquid metal to a magnetic field and measuring the force acting up...Lorentz force velocimetry(LFV)is a noncontact technique for the measurement of velocities in hightemperature metal melts that is based on exposing the liquid metal to a magnetic field and measuring the force acting upon the magnet system([1],[2],[3],[4]).The present communication provides an overview of recent research activities in LFV carried out at the Institute of Thermodynamics and Fluid Mechanics at Ilmenau University of Technology.The overview will focus on fundamental issues such as the suitability of LFV for local velocity measurement as well as on applications such as flow measurement in poorly conducting melts,industrial applications in aluminium production as well as on wet,dry and numerical calibration methods for LFV-systems.The present overview will be supplemented by individual presentations on specific topics to be presented in the papers by Heinicke,Jian,Wegfrass,Gramss,Kolesnikov and Karcher.展开更多
The growth of polycrystalline silicon layers on glass from tin solutions at low temperatures is presented.This approach is based on the steady-state solution growth of Si crystallites on nanocrystalline seed layers, w...The growth of polycrystalline silicon layers on glass from tin solutions at low temperatures is presented.This approach is based on the steady-state solution growth of Si crystallites on nanocrystalline seed layers, which are prepared in a preceding process step. Scanning electron microscopy and atomic force microscopy investigations reveal details about the seed layer surfaces, which consist of small hillocks, as well as about Sn inclusions and gaps along the glass substrate after solution growth. The successful growth of continuous microcrystalline Si layers with grain sizes up to several ten micrometers shows the feasibility of the process and makes it interesting for photovoltaics.展开更多
基金Item Sponsored by German Science Foundation (Deutsche Forschungsgemeinschaft) in the Framework of the Research Training Group (Graduiertenkolleg) "Lorentz Force Velocimetry and Lorentz Force Eddy Current Testing"at Ilmenau University of Technology
文摘Lorentz force velocimetry(LFV)is a noncontact technique for the measurement of velocities in hightemperature metal melts that is based on exposing the liquid metal to a magnetic field and measuring the force acting upon the magnet system([1],[2],[3],[4]).The present communication provides an overview of recent research activities in LFV carried out at the Institute of Thermodynamics and Fluid Mechanics at Ilmenau University of Technology.The overview will focus on fundamental issues such as the suitability of LFV for local velocity measurement as well as on applications such as flow measurement in poorly conducting melts,industrial applications in aluminium production as well as on wet,dry and numerical calibration methods for LFV-systems.The present overview will be supplemented by individual presentations on specific topics to be presented in the papers by Heinicke,Jian,Wegfrass,Gramss,Kolesnikov and Karcher.
基金Project supported by the German Research Foundation(DFG)(No.BO 1129/5-1)
文摘The growth of polycrystalline silicon layers on glass from tin solutions at low temperatures is presented.This approach is based on the steady-state solution growth of Si crystallites on nanocrystalline seed layers, which are prepared in a preceding process step. Scanning electron microscopy and atomic force microscopy investigations reveal details about the seed layer surfaces, which consist of small hillocks, as well as about Sn inclusions and gaps along the glass substrate after solution growth. The successful growth of continuous microcrystalline Si layers with grain sizes up to several ten micrometers shows the feasibility of the process and makes it interesting for photovoltaics.
