Figure 2. High speed video camera images with a frame exposure time of 1 µs and frames per second Figure 2. High speed video camera images with a frame exposure time of 1 µ s and frames per second rate of 500 fps: when ( a – c ), there is no material to be processed in the reactor and ( d – f ) is when the rate of 500 fps: when ( a – c ), there is no material to be processed in the reactor and ( d – f ) is when the reactor is filled with the clay to be treated. reactor is filled with the clay to be