抄録
Two-dimensional fluidized beds of glass and polystyrene beads were investigated from the view point of image analysis. Images of a two-dimensional fluidized bed were recorded by a digital video camera at 1/30-second intervals and the fractal dimension of a contour image was quantitatively determined by using the cover method. The fractal dimension fluctuates with time, corresponding to the birth, growth and collapse of bubbles in the fluidized bed. Fifty percent value and standard deviation of fractal dimension distribution increase with non-dimensional air velocity. The 50% value is correlated with a standard deviation of fractal dimension.
