Model Studies of Mixing Phenomena in Stirred Melts

Abstract

Mixings were performed in a water model system of a gas-stirred ladle with both an optical decolorization method and conductivity measurements at different positions within the vessel. The experimental results show that the rate by which the concentration is homogenized depends on the location of the measuring probe as well as on the used stirring conditions, e.g. gas flow rate and position of the gas injection nozzle. Furthermore, a new theoretical mixing model that combines the concepts of the circulating concentration cloud and the two-tank model is presented. The results of numerical calculations using the model are compared with experimental data of mixing in the water model and in a 40-tonne steel ladle.

Mixing time and fluid flow phenomena in liquids of varying kinematic viscosities agitated by bottom gas injection

“…Recently, Mazumdar et al [15] standardized the diverse experimental conditions applied by various investigators [13,14,16,17] in studying mixing phenomena in ladles to a unique set of reference conditions, through the application of appropriate criteria. They have concluded that Eq.…”

Effect of Salt Solution Tracer Dosage on the Transport and Mixing of Tracer in a Water Model of Asymmetrical Gas-Stirred Ladle with a Moderate Gas Flowrate

“…(2) The mixing performance at different monitoring points was widely studied in 1980s by Oeters and co-workers [76][77][78][79][80][81]. In 1988, Krishna-Murthy et al [82] concluded that the mixing time did not depend on the variations in the amount of tracer used.…”

Effect of the Location of Tracer Addition in a Ladle on the Mixing Time through Physical and Numerical Modeling

“…However, various works have been reported in literature with contrasting conclusions, such as the investigations carried out by Krishna Murthy and his colleagues [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] in which the authors conclude that the measurements obtained of the mixing time do not depend on the location neither on the tracer amount released with which the conductivity technique is performed. On the other hand, various authors conclude that not only the location of the sensors 22) affects the mixing time measurements but also the location of the tracer addition [23][24][25] is a variable that considerably affects the time required to reach a homogeneity degree of 95%. The discrepancies between authors have given rise to discussions and communications 26) between authors with reference to the relevance of the influence that a location of the addition of the tracer has on the experimental measurements of mixing time.…”