Determination of the Conditions of Laminar/Turbulent Flow Transition Using Pressure Compensation Method in the case of Ga75In25 Alloy Stirred by RMF

Rónaföldi, Arnold and Roósz, András and Veres, Zsolt (2021) Determination of the Conditions of Laminar/Turbulent Flow Transition Using Pressure Compensation Method in the case of Ga75In25 Alloy Stirred by RMF. JOURNAL OF CRYSTAL GROWTH. pp. 1-10. ISSN 0022-0248 (print); 1873-5002 (online)

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Abstract

The effect of melt-flow on the microstructure has been investigated by performing several unidirectional solidification experiments where the melt was flown in a rotating magnetic field. It is a well-known fact that the angular frequency of the melt cylinder always differs from the angular frequency of the magnetic field. However, it proves to be very difficult to determine during the experiments. In our present study, the magnetic Taylor number and the Reynolds number were determined as a function of the radius of melt cylinder, the magnetic induction, and the angular frequency of magnetic field using the real angular frequency defined by the so-called pressure-compensation method developed earlier in the case of Ga75In25 alloy. The simulations developed for performing similar experiments can be checked as well as the different experiments can be compared correctly by using the obtained measurement results. By knowing the critical Reynolds number belonging to the laminar/turbulent flow transition, the value of critical magnetic induction belonging to the transition was determined as a function of the radius of the melt cylinder.

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