Abstract
Particle clusters formed in gas-solid flows in risers of circulation fluidized beds or pipes of pneumatic transport systems have much influence on various kinds of transport phenomena. In the present study, the structure of flow with particle clusters is investigated numerically. Especially effects of particle diameter on the cluster structure and the intensity of fluctuating velocity are studied. As a result, it was found that the scale of particle clusters increases with increasing particle diameter and that the intensity of streamwise fluctuating velocity is 0.5 to 1.3 times of the terminal velocity.
