©BRAINBARTER EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
UOPS 4 FINALS PART 2 UPDATED
Applications of settling and sedimentation - answer✔- removal of solids from liquid sewage
wastes
- settling of crystals from mother liquor
- separation of liquid-liquid mixture from a solvent extraction stage in a settler
- settling of solid food particles from a liquid food
Sedimentation - answer✔- the tendency for particles to settle out of the fluid in which they are
entrained and come to rest against a barrier
Factors affecting sedimentation - answer✔- particle size
- liquid viscosity
- solid and solution density
Types of particles - answer✔- totally discrete particles
- flocculent particles
1|Page
, ©BRAINBARTER EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
sphericity - answer✔- surface area of a sphere having the same volume as the particle per
surface area of the particle
Types of sedimentation - answer✔1. Free settling
2. Hindered settling
Free settling - answer✔- when the particle is at a sufficient distance from the walls of the
container and from other particles so that the fall is not affected by them
Hindered settling - answer✔- if the motion of the particles is impeded by other particles, which
will happen when the particles are near each other even though they are not actually colliding
External force - answer✔- expressed as a product of the mass and the acceleration of the
particle from this force
Forces acting on the body - answer✔- external force acting downward
- buoyant force acting upward
- resistance or drag force in opposite direction to the particle motion
buoyant force - answer✔- based on Archimedes' law
- the product of the mass of the fluid displaced by the particle and the acceleration from the
external force
2|Page
ALL RIGHTS RESERVED.
UOPS 4 FINALS PART 2 UPDATED
Applications of settling and sedimentation - answer✔- removal of solids from liquid sewage
wastes
- settling of crystals from mother liquor
- separation of liquid-liquid mixture from a solvent extraction stage in a settler
- settling of solid food particles from a liquid food
Sedimentation - answer✔- the tendency for particles to settle out of the fluid in which they are
entrained and come to rest against a barrier
Factors affecting sedimentation - answer✔- particle size
- liquid viscosity
- solid and solution density
Types of particles - answer✔- totally discrete particles
- flocculent particles
1|Page
, ©BRAINBARTER EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
sphericity - answer✔- surface area of a sphere having the same volume as the particle per
surface area of the particle
Types of sedimentation - answer✔1. Free settling
2. Hindered settling
Free settling - answer✔- when the particle is at a sufficient distance from the walls of the
container and from other particles so that the fall is not affected by them
Hindered settling - answer✔- if the motion of the particles is impeded by other particles, which
will happen when the particles are near each other even though they are not actually colliding
External force - answer✔- expressed as a product of the mass and the acceleration of the
particle from this force
Forces acting on the body - answer✔- external force acting downward
- buoyant force acting upward
- resistance or drag force in opposite direction to the particle motion
buoyant force - answer✔- based on Archimedes' law
- the product of the mass of the fluid displaced by the particle and the acceleration from the
external force
2|Page
