Abstract
A study has been carried out of the influence of inertial and Coriolis forces on the hydrodynamics of flow along the inner wall of a rotating cup. It is shown that when these forces are pronounced, the liquid velocity components may be considerably less than those predicted from simple analyses based solely upon a balance of centrifugal and viscous forces, and the velocity at the lip may consequently be critically dependent upon the position of the feed.
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Abbreviations
- a :
-
half-angle of divergence of cup
- B, C :
-
parameters in (21) and (22)
- D :
-
diameter of spinning cup
- e :
-
value of f subtended by liquid film
- f :
-
a−θ
- F :
-
body force per unit mass
- h :
-
liquid film thickness
- n :
-
kinematic viscosity
- p :
-
pressure
- Q :
-
volumetric flowrate
- r :
-
radial distance in spherical coordinate system (see Fig. 1)
- R :
-
radial distance of cup wall from axis of rotation
- t :
-
time
- V :
-
velocity
- w :
-
angular velocity of cup
- w′ :
-
mean angular velocity of liquid
- θ :
-
angle in spherical coordinate system (see Fig. 1)
- ρ :
-
liquid density
- φ :
-
angle in spherical coordinate system (see Fig. 1)
- H:
-
value ignoring inertial and Coriolis forces
- i:
-
initial value
- m:
-
mean value across liquid film
- r:
-
component in r-direction
- s:
-
value at air/liquid interface
- θ :
-
component in θ-direction
- φ :
-
component in φ-direction
References
Bär, P., Doctoral dissertation, Technical College, Karlsruhe, 1935.
Emslie, A. G., F. T. Bonner, and L. G. Peck, J. of Appl. Phys. 29 (1958) 858.
Hinze, J. O., and H. Milborn, J. of Appl. Mech. 17 (1950) 145.
Lance, G. N., Numerical Methods for High Speed Computers (London: Iliffe and Sons), 1960.
Fraser, R. P., N. Dombrowski, and J. H. Routley, Chem. Eng. Sci. 18 (1963) 315.
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Dombrowski, N., Lloyd, T.L. Hydrodynamics of flow along the wall of a rotating cup. Appl. Sci. Res. 28, 278–288 (1973). https://doi.org/10.1007/BF00413073
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DOI: https://doi.org/10.1007/BF00413073