球の流動抵抗を利用した溶融金属用流速測定法

概要

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The objective of this study is to develop a new velocimeter utilizing the drag force of a sphere which is applicable to velocity measurement of high temperature molten metal flow. Although the drag coefficient C_D is required for the evaluation of drag force, has not been studied for a fluid flow with high turbulence intensity and turbulence scale typical of ironmaking and steelmaking processes. Therefore, C_D was measured using a sphere placed in a wind tunnel equipped with turbulence generator and correlated as a function of Reynolds number Re and turbulence intensity Tu. The effect of turbulence scale was found to be negligible. A new velocimeter using a sphere was developed and its applicability was examined in cold models such as an air jet of Tu≒2%, a water jet of Tu=30∿40%, and a water-air bubbling jet of Tu=40∿50%. Agreement between the results obtained by the present velocimeter and those obtained by existing velocimeters, for example, Laser Doppler Velocimeter, hot wire anemometer and pitot tube was quite reasonable. Velocity measurement in a mercury-air bubbling jet also revealed the possibility of the usage of the present velocimeter for high temperature and high turbulence molten metal flow in metallurgical reactors.
社団法人日本鉄鋼協会の論文
1993-09-01