Proposal of a Novel Agitation Method using Swirl Motion of Molten Metal Jet

Self-Induced Rotary Sloshing Caused by an Upward Off-Centered Jet in a Cylindrical Container

“…Figure 2 shows the comparison of the possible occurrence boundary of the jet-induced rotary sloshing between the centered and off-centered nozzle injections. The horizontal axis is normalized by the modified Rossby number, Ro m Q 2 L =ðgd 2 nen D 3 Þ, which was suggested by Yoshida et al 3) The possible swirl region which corresponds to the bounded area by each plot seems to become narrow with increasing of L E . Figure 3 shows the comparison of the swirl period between the centered and off-centered nozzle injections.…”

“…1 is the frequency of the sloshing, H L is a static liquid level, a is the radius of the container, g is the acceleration due to gravity and k 1 is the lowest root of the derivative of the first-order Bessel function and the value is approximately 1.84. Jet-induced rotary sloshing can be observed in a partially filled cylindrical container having a centered inlet nozzle and some drain nozzles (see, for instance, Madarame et al; 2) Yoshida et al 3) ). The inlet jet is injected through the inlet nozzle and the same volume is synchronously drained through the outlet nozzles so that the bath volume is kept constant.…”

Prediction of the Occurrence of Swirling Liquid Jet

“…The preferable occurrence condition under which the swirl motion occurred was correlated in terms of the aspect ratio of the bath and a modified Rossby number. 3) This agitation method is also applicable to wastewater treatment. The authors are trying to develop a method of removing BOD, COD, and dioxin contained in wastewater by chemical reactions with ozone.…”

“…1,2) Considering these circumstances, the authors proposed a novel agitation method for a molten steel bath using a swirl motion of a bottom blown steel jet. 3,4) The jet can be generated by making use of a potential energy difference between the surfaces of the baths contained in two vessels. This swirl motion is very similar to that observed in a cylindrical bath agitated by bottom gas injection.…”

“…[5][6][7][8][9][10][11][12] As a first step, water model experiments were carried out to validate the usefulness of that method. 3,4) Water was injected through a centered single-hole bottom nozzle into a water bath contained in a cylindrical vessel to generate a water jet above the nozzle. The bath was strongly agitated when a swirl motion of the water jet occurred.…”