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Granular Materials: Liquid-like Properties of Sand - page 13 / 14

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lg, flow 120 lg, flow 90 lg flow 150 lg, flow 135 F(150) F(135) F(120) F(90)

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v (m/s)

Fig 11

Above are the fitted lines to the data.

During the experiment we have done many different things to the apparatus to

improve the data during the experiment. One major problem that we fixed was that the

first frit was not allowing the sand to become fluidized evenly. We also had some

problems that were fixed with the translation stage becoming stuck from sand getting

under it. Also, the motor shaft was vibrating making a lot of noise in the data and the

sand was not heating very fast. These things were repaired or corrected.

Conclusion

This experiment has allowed us to learn many different things about the

fluidization of sand. We have learned that drag force can be described as the products of

2 functions, one of velocity, and one of the gas flow rate, Fdrag = g(v) (w). We have

l

e a r n e d t h a t t h e a p p a r e n t p o w e r l a w r a t e o f i s a b o u t 2 . 3 ( ( W - 7 8 ) / 7 8 )

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T h e d r a g f o r c e i s

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