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- The apparatus has been designed to introduce students to the fundamental characteristics of the behaviour of particle/fluid systems, in particular the relationship between the drag coefficients of falling particles and their Reynolds’ number value. Particles covering a range of sizes and densities are supplied. The experiments are conducted by allowing single particles to fall through a number of different liquids contained in vertical Transparent tubes. Blockage effects are reduced to a minimum as the largest particle used has a projected area of only 1% of the tube cross-section. The rate of fall of the particles is determined by timing their passage between two marks on the walls of the glass tubes.
