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Civil Law > ParTech, Sedi > Flashcards

ParTech, Sedi Flashcards

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1
Q

Resistance to indentation
Resistance to scratching

A

Hardness

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2
Q

Ease with which a substance may be broken by impact

A

Brittleness or Friability

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3
Q

Data for particle sizes are usually expressed in terms of the fraction retained in a screen

A

Particle Size Analysis

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4
Q

Equivalent Diameter Equation

A

Diameter of a sphere of equal volume as
that of the particle

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5
Q

Sphericity Equation

A

Sphericity = 6V/D*S

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6
Q

Units for particle size:
Coarse particles

A

inch or mm

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7
Q

Units for particle size:
Fine particles

A

mesh size

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8
Q

Units for particle size:
Very fine particles

A

um or nm

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9
Q

Units for particle size:
Ultrafine particles

A

m^2/gram

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10
Q

Screening

A

Separation of a mixture of particles of various sizes into two or more portions,

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11
Q

Dry Screening

A

Treatment of a material containing a natural amount of moisture

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12
Q

Wet Screening

A

Water is added to the material being treated to wash the fine material through the screen

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13
Q

Screen Aperture

A

Clear space between individual wires of the screen

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14
Q

Mesh

A

Number of apertures per linear inch

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15
Q

Oversize

A

+ Material
The material that fails to pass through the screen openings

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16
Q

Undersize

A
  • Material
    The material that passes through the screen openings
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17
Q

Screen blinding

A

Clogging of the screen openings with sample particles

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18
Q

Sieving

A

For determination of particle size
distribution

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19
Q

Closed circuit operation

A

Oversize material is returned to the crusher

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20
Q

Open circuit operation

A

No material is returned to the crusher

21
Q

Sieving

A

For determination of particle size
distribution

22
Q

Thickener / Clarifier

A

Industrial unit in which the concentration of a suspension is increased by sedimentation, with the formation of a clear liquid

23
Q

Thickening

A

Often referred to as “dewatering”.

24
Q

Centrifugal Separators

A

Used to enhance settling time of particles

25
Q

Sieving

A

For determination of particle size
distribution

26
Q

FLUIDIZATION STAGE:
it is the fluidization stage wherein particles remain in contact with one another and the bed structure remain stable until the velocity is increased to the point where pressure drop is balanced by the weight per unit area of the particles

A

fixed bed

27
Q

FLUIDIZATION STAGE:
in gas-fluidized systems, it is the region where the dominant pattern is one of the vertically upward transport of particles , essentially gas-solids transport or pneumatic conveying

A

fast fluidization

28
Q

FLUIDIZATION STAGE:
it is the stage where in the bed continues to flow upward even at constant velocity . there is no trend for bed height and pressure drop

A

mobilized bed

29
Q

FLUIDIZATION STAGE:
in this stage it is when the particles are hoovering in the fluid , drag force balances the weight of the particles , the bed height increases and it has constant pressure drop

A

fluidized bed

30
Q

Equation used to describe flow of fluid through a porous medium under laminar condition is ____

A

Kozeny-Carman Equation

31
Q

Sedimentation

A

Operation by which solids are separated from liquids due to the difference in their respective densities

32
Q

SEDIMENTATION MECHANISM:
Regardless of their properties, the particles are sufficiently far apart to settle freely.

A

Dilute / Free Sedimentation

33
Q

The ultimate velocity when the acceleration force and resisting (buoyant & drag) force are equal. Remains constant in this velocity afterwards.

A

Terminal Velocity

34
Q

Classification

A

Separation of solid particles into several fractions based upon their terminal velocities.

35
Q

SEDIMENTATION MECHANISM:
Settling at high concentrations. Particles no longer settle individually.

A

Hindered Sedimentation

36
Q

SEDIMENTATION MECHANISM:
Channels of fluid forces through the particle mass

A

Channeling

37
Q

SEDIMENTATION MECHANISM:
When the suspension zone disappears, and all the solids are contained in the sediment

A

Critical Sedimentation Point

38
Q

SEDIMENTATION MECHANISM:
Particles closer to the base will be compressed by the mass of solids above,

A

Compression

39
Q

Create large conglomerations of elementary particles with occluded liquid.

A

Flocculation

40
Q

Addition of electrolytes to form ions to neutralize charges of particles (electrolyte cation neutralize negative particles and such).

A

Coagulation

41
Q

Methods used in Thickener Calculation

A

a. Yoshioka Construction (Graphical)
b. Talmadge and Fitch Method

42
Q

PRESSURE DROP IN FIXED BEDS:
Laminar Flow

A

Kozeny-Carman
Re < 1.0

43
Q

PRESSURE DROP IN FIXED BEDS:
Turbulent Flow

A

Burke-Plummer equation
Re > 1000

44
Q

PRESSURE DROP IN FIXED BEDS:
Laminar and Turbulent Flow

A

Ergun equation

45
Q

FLUIDIZATION REGIMES:
Describe dP/l vs velocity and bed height for
Fixed Bed

A

Increasing dP/l
Constant bed height

46
Q

FLUIDIZATION REGIMES:
Describe dP/l vs velocity and bed height for
Fluidized Bed

A

Highest dP/l

47
Q

FLUIDIZATION REGIMES:
Describe dP/l vs velocity and bed height for
Transport Regime

A

Decreasing dP/l
Increases bed height

48
Q

CLASSIFIER TYPES:
1. Gravity
2. Sorting

A
  1. Gravity
    Based on Particle Size
  2. Sorting
    Particle Densities
49
Q

Factors affecting Centrifuge

A
  1. Feed Characteristics
  2. Equipment Size
  3. Operating Parameters
    *Bowl speed
    *Water depth
    *Differential spiral feed

Civil Law (31 decks)

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