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Drag Coefficient Apparatus (SMT-FM-21)
Compact, wall mounted apparatus to study the
behaviour of particles and shapes within fluids.
Two transparent vertical glass tubes, back lit by a
fluorescent lamp for ease of viewing.
Tube sizes 93mm inside diameter by 1.5m long,
with calibration marks for timing.
Guide to aid the insertion of particles at the top of
Sliding valves to aid the removal of particles from
the bottom of the tubes.
The equipment is supplied with sets of spheres of
different sizes and materials, plus two streamlined
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 glass 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.