This paper describes different techniques used to measure velocities in various high temperature hostile fluids like liquid metals and slags. Very few techniques exist that can provide reliable measurements of velocities in these hostile fluids. The melting sphere velocity technique is described in detail. The application of this technique involves two stages. The first stage called also calibration stage, involved measurement of sphere melting under known fluid flow conditions. The second stage, known also as measurement stage, the sphere is immersed in unknown fluid flow conditions, and from the detected sphere melting time the liquid metal velocity can be inferred. This technique was applied in liquid aluminum and in liquid steel. The technique itself is flexible and can be modified to be used to other type of high temperature hostile fluids. How this technique can be modified to be adopted in other liquid metals or slags is shown.
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