Flow Measurements in a Liquid Metal Model for Continuous Casting of Steel
Dennis Schurmann, eMail: email@example.com
LIMMCAST stands for LIquid Metal Model for Continous CASTing of Steel. Three different LIMMCAST facilities exist: LIMMCAST, Mini-LIMMCAST and X-LIMMCAST. While LIMMCAST is operated with SnBi at approx. 200°C, the Mini-LIMMCAST is operated with GaInSn at room temperature. The Mini-LIMMCAST facility can be seen in the following picture.
Ultrasound Doppler Velocimetry (UDV)
The Ultrasound Doppler Velocimetry (UDV) offers a non-invasive method to measure the velocity distribution in an opaque liquid metal like GaInSn. A number of ultrasound pulses are sent repeatedly by a transducer. When no pulses are sent the transducer receives the echo signal, reflected by moving particles in the fluid. The velocity component along the ultrasound propagation line is computed via a correlation analysis of two consecutive echo signals. Therefore it is possible to record one velocity component (1c) along a the propagation line (1d). This procedure is repeated several times to receive the velocities at different times. Several transducers, aligned parallel to each other in an array, can be polled sequentially to measure the velocity distribution in two dimensions (2d). We operate a DOP 3010 (Signal Processing SA, Switzerland) with up to ten individual ultrasound transducers or a high resolution academic system to perform UDV to get the velocity distribution (1c-2d) inside our continuous casting model mold. By moving the array of transducers a bigger area in the mold can be covered. Due to the sequential measurement at different positions, in this case only the time average velocities can be evaluated together.
In the following picture the velocity distribution along the complete height of the mold is shown in the 3d-model of the setup. Six individual measurements have been combined to create the contour plot of the time average velocities. The line diagrams on the poster represent a cut through the contourplot at x = 0.
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The Helmholtz-Zentrum Dresden-Rossendorf
Department of Magnetohydrodynamics