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Pneumatic conveyors can be used to transport dispersed solids over great distances in pipelines. The solid is transported out of a feed tank via a vibrating trough into an airflow. An interchangeable injector disperses the solid in the airflow. The airflow transports the solid upwards in the tube. The transport terminates in a collector tank. Depending on the velocity and solid content of the airflow, different transport states may occur. At high velocities, the solid is dispersed evenly across the cross-section of the tube (dilute phase transport). If the velocity is reduced, strands and balls form on the wall of the tube which then slide down owing to their higher settling velocity. The strands and balls disintegrate again in the airflow and reform. Reducing the velocity to below the settling velocity of the individual particles ultimately results in plug transport. The different transport states can be observed through the transparent tube. To identify the pressure loss and the flow velocity, measuring points are provided at all relevant positions. The velocity of the airflow is adjusted by a pressure regulator. The solid mass flow can be adjusted by way of the throw of the vibrating trough on a potentiometer. The compressed air can be provided from the laboratory supply or by the supply unit . Peas or plastic granulate are recommended for use as the solid. The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.
Rakesh Mittal (Elab Engineering)
F-197/A, ALPHA-2 GREATER NOIDA Gautam Budh Nagar, Uttar Pradesh - 201308, India
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