1992 Volume 78 Issue 12 Pages 1786-1793
As a fundamental study on the melting process of injected ore and coal powders in an inbath smelting reduction furnace, a cold model experiment was done to reveal the effects of gas flow rate and nozzle diameter on the mass transfer coefficient from a solid body immersed in a cylindrical bath with bottom gas blowing. The mass transfer coefficient was measured by means of an electro-chemical method. Spheres of three different diameters and a flat plate made of platinum were chosen as representative bodies. Since the turbulence intensity of liquid flow in the bath became very high due to gas blowing, a correlation for the mass transfer coefficient was proposed for each body as a function of turbulence intensity Tu in addition to usually used Reynolds and Schmidt numbers. The correlation can predict the heat transfer coefficient from solid bodies immersed in bubbling jet as well. Therefore, it can be said that an analogy between heat and mass transfer exists in bubbling jet, too. On the basis of the present experimental results, a correlation for the mass transfer from a circular cylinder was newly proposed. The present correlation was found to be useful for the prediction of the mass transfer from a circular cylinder.
