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Two-Field Excitation for Contactless Inductive Flow Tomography.

Max Sieger1, Katharina Gudat1, Rahul Mitra1

  • 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Fluid Dynamics, Department Magnetohydrodynamics, Bautzner Landstraße 400, 01328 Dresden, Germany.

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Summary
This summary is machine-generated.

Contactless inductive flow tomography (CIFT) visualizes electrically conducting fluid flow using induced magnetic fields. This technique successfully reconstructs 3D liquid metal flows by employing two excitation fields, achieving high temporal resolution.

Keywords:
contactless inductive flow tomographyinductive measurementsinverse problemliquid metal flowmagnetohydrodynamics

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Area of Science:

  • Fluid dynamics
  • Electromagnetic induction
  • Tomographic imaging

Background:

  • Contactless inductive flow tomography (CIFT) enables non-invasive flow visualization in conductive fluids.
  • It relies on measuring weak magnetic fields induced by fluid motion within an excitation field.
  • Reconstructing complex flow fields requires advanced inverse problem-solving techniques.

Purpose of the Study:

  • To develop and demonstrate a method for reconstructing three-dimensional liquid metal flows using CIFT.
  • To investigate the effectiveness of using multiple excitation magnetic fields for enhanced flow imaging.
  • To achieve high temporal resolution in flow measurements of liquid metals.

Main Methods:

  • Utilized a laboratory demonstrator with the liquid metal alloy GaInSn.
  • Applied two perpendicular excitation magnetic fields, either multiplexed or concurrently with different frequencies.
  • Employed the lock-in principle for signal disentanglement in the concurrent frequency approach.
  • Solved the linear inverse problem with regularization for flow field reconstruction.

Main Results:

  • Successfully reconstructed the three-dimensional flow structure of liquid metal.
  • Achieved a temporal resolution down to 3 seconds using the multiplexing approach.
  • Demonstrated the feasibility of concurrent sinusoidal excitation fields for flow reconstruction.

Conclusions:

  • Contactless inductive flow tomography is a viable technique for 3D liquid metal flow visualization.
  • The use of multiple excitation fields significantly improves flow reconstruction capabilities.
  • Optimized excitation field strategies, including multiplexing and frequency-based separation, enhance temporal resolution and accuracy.