同傍大学 Tongji University II. Particle Settling Theory Assumed ideal conditions: 1.The particle is constantly ball-shaped and can not be compressed during sedimentation process which is not affected by container wall 2.The liquid is quiescent and can not be compressed. 3.The gravity field is uniform and constant
Tongji University Assumed ideal conditions: 1. The particle is constantly ball-shaped and can not be compressed during sedimentation process which is not affected by container wall. 2. The liquid is quiescent and can not be compressed. 3. The gravity field is uniform and constant. II. Particle Settling Theory
同©大号 Tongji University Force Balance of a Particle in Liquid Up Force of F increases with floating increasing velocity Force of gravity V Resistance F Kept constant Down force
Tongji University Force Balance of a Particle in Liquid Force of floating Force of gravity Down Up Resistance force FG Kept constant Fd increases with increasing velocity
同燎大学 Tongji University A particle will settle when the impelling force of gravity exceeds the inertia and viscous forces.The gravitational force F can be expressed as: FG=(Pp-Pw)·g'。 () where F=gravitational force, Pp=density of particle, Pw=density of water, g=acceleration due to gravity, =volume of particle
Tongji University A particle will settle when the impelling force of gravity exceeds the inertia and viscous forces. The gravitational force FG can be expressed as: FG p w gVp ( ) where Fg = gravitational force, ρp = density of particle, ρw = density of water, g = acceleration due to gravity, Vp = volume of particle, (1)