given the analogy for gas
Answers
Explanation:
High-speed cine photography is used to measure the propagation velocity of air slugs in the dense-phase pneumatic conveying of polyethylene granules through a 47.3 mm I.D. horizontal glass pipeline. The motion of each gas slug relative to the particle plug ahead of it appears to be the same as for a gas bubble moving through an inviscid liquid in a horizontal tube. This gas—liquid analogy is both qualitative, in that the shape of the interface between gas and particulate phase resembles that of a gas—liquid system, and quantitative, in that the velocity of the back of a plug relative to the particles ahead of it appears, on average, to be almost the same as for a gas—inviscid liquid system, i.e. 0.542 , where g is the acceleration due to gravity and D is the internal diameter of the tube.