| Author | Wisist Hutachitta |
| Call Number | AIT Thesis no. 44 |
| Subject(s) | Fluid mechanics
|
| Note | A thesis submitted in partial fulfillment if the requirements for the degree of Master of Engineering in the SEATO Graduate School of Engineering, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The effect of concentration on the fall velocity of a sphere in
a sand-water mixture was determined experimentally and compared to
results predicted by a theoretically derived equation. The fall
velocity was determined theoretically by assuming that the sandwater mixture produced a bouyant force on the sphere equivalent to
that which would exist in a homogeneous fluid having the same specific weight as the sand-water mixture. The drag coefficient-Reynolds
number relationship was then used to determine the fall veloctiy required to produce a drag force equal to the assumed bouyant weight.
The diameter of each sphere used in the laboratory experiments was
0.281 inches, while their specific gravities varied, having values
of 1.06, 1.10, 1.14 and 1.19. The tube containing the sand-water
mixture was made of clear plastic having an inside diameter of 1.747
in. The sand used as the solid phase of the slurry was fed into the
tube from a constant feed hopper. The specific gravity of the sand
was 2.59 and varied in grain size between 0.147 mm to 0.208 mm. The
concentration of solids in the sand-water mixture varied between
0.347 and 0.898 percent. The Reynolds number of the falling spheres
varied between 935 and 1610. Experimentally determined values of the
fall velocity of the sphere in the sand-water mixture agreed with the
trend of the results predicted by the theoretically derived equation.
Qualitative results were also obtained, confirming the fact that the
fall velocity of a sphere decreases with increasing solid concentration,
by experimentally showing that a sphere which would sink in a solution
of glycerine and water would be bouyant if the solution contained a
sufficient amount of suspended sand.
|
| Year | 1963 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Degree | Thesis (M.Eng.) - SEATO Graduate School of Engineering |