Abstract
Metallurgical processes of refining and degassing liquid metals are related to the blowing-in neutral gasses like for example argon. Effectiveness of the process depends on the flowing gas parameters like: dimensions, velocity, distribution amd gas phase flow zone. These parameters can be changed under the influence of outside magnetic field and formed by it a Lorentz’ force. In order to get full information of rising bubbles essential are certain measuring methods. Among many of these the ultrasonic echo pulse method is likely to be the most intensive developed in the past few years. That method enables estimation of gas phase flow parameters in a range from individual bubble flow up to full continuous gas flow at the inlet nozzle. In this paper a measurement principle has been described for an ultrasonic echo method and there also submitted and discussed results of obtained results for diphase flow of GaInSn-argon.
Highlights
The two-phase liquid metal-gas flow appears in many technological processes like in metallurgical process of after-furnace steel refining
A refining efficiency depends on the dimension of rising bubbles, its contact time with metal, the rise zone, and the flow stream of bubbles
The ultrasonic echo pulse method is presently used by TU Dresden for identification of two-phase liquid metal-gas flow parameters in their project studies on “Elektromagnetische Stromungsbeeinflussung in Matallurie, Kristallzuchtung und Elektrochemie” no SFB 609
Summary
The two-phase liquid metal-gas flow appears in many technological processes like in metallurgical process of after-furnace steel refining. In order to get a complete knowledge of the rising gas bubbles an experimental studies of two-phase liquid metal-gas flow are essential. The ultrasonic echo pulse method is presently used by TU Dresden for identification of two-phase liquid metal-gas flow parameters in their project studies on “Elektromagnetische Stromungsbeeinflussung in Matallurie, Kristallzuchtung und Elektrochemie” no SFB 609. The aim of the article is to present selected research results: rise velocity of bubbles, its creation frequency, dimensions and flow zone in the liquid metal using the echo pulse methopd. The method has been elaborated for a container filled with liquid metal Ga68 In20 Sn12 where the argon gas phase was blow-in through a nozzle. Magnetic field influences the rise velocity and the final velocity of gas bubbles, the movement trajectory
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