MOTION OF PARTICLES IN BENDS OF CIRCULAR PIPES

The trajectories of particles moving in curved tubes are calculated using a fully developed laminar flow. The flow field, consisting of a core region and a boundary layer, was proposed and experimentally tested by Mori and Nakayama ( 1965) for values of the flow Reynolds number up to 4000. The calculated trajectories are used to predict the distribution of inertia-particles at a cross-section 9.375 dia downstream of a 90°bend. In addition, the fractions of entering particles deposited by inertial impaction and interception in a 90°bend are computed. The results show that the flow Reynolds number has significant effects on particle deposition in bends. The theoretical predictions for the distribution of particles downstream of a bend and the efficiency of deposition are in good agreement with experimental results reported in the literature.#B018100