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Slag foaming which is a common phenomen on during the refining process in thesteelmaking industry changes the properties of slag and leads to deterioration of refining capability Therefore, it is necessary to perform model experiments to investigate the foaming characteristics. In this report, cold model experiment apparatus based on sucrose solution was built and the effect of gas flow rate and viscosity of solution on foaming height. As a result, the height increased with decreasing in gas flow rate and viscosity due to the formation of a cavity zone in foaming slag.

”Industrial Material” is an important subject that is related to all subjects in the mechanical engineering department. Familiar examples, famous accidental cases, and intriguing videos were adopted in the text in order to appeal to and motivate learners. As a result, attention to “Industrial Material” was created and the learners could confirm the relevance of it according to questionnaires. Moreover, relatively high satisfaction was obtained whereas the confidence of learners was partly captured. Therefore, homework assignments and feedback to learners should be improved in the future.

This paper presents an analytical approaches on segregation phenomena and its occurrence condition of woody debris using DEM. In advance, a ball mill experimental device is used to observe behavior of water, dry woody debris, and woody debris. The water in the experiment make similar shape of surge observed in debris flow in situ. The woody debris cause several type of moving phenomena including segregation of woody debris. DEM is used to simulate those results. The method suggests a new model to experess water behavior. The element has a special shape like a sphere, and a constitutive law for water pressure translation mechanism and momentum following DEM. The simulation reproduces the experimetnatal results and makes clear the segregation mechanism.

We investigated the shapes and dynamic behaviors of vortexes in a mechanically agitated water bath, focusing attention mainly on inclined-vortex formation by offset agitation that is effective for the mixing of a liquid and low density particles. The shapes of observed vortexes were classified into two groups, i.e., inclined vortexes and pseudo-vertical vortexes. The dynamic behaviors of the vortexes were classified into the following types: (1) stable, (2) intermittently developed, and (3) undeveloped vortexes. The relationship between the vortex type and geometrical conditions (i.e., the depth of the water, HW, and the height of the impeller, H) was summarized as the vortex formation map (H-HW diagram) for given bath diameter, rotation speed of the stirrer and offset distance, RE. The condition for the formation of each vortex-shape group was expressed by the corresponding equation containing geometrical parameters such as H, HW, and RE.