Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Particle Technology > Separation of Particle from Solid-Gases > Flashcards

Separation of Particle from Solid-Gases Flashcards

1
Q

What is a PRIMARY purpose of gas-solid separation?

A

To improve air quality

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Dust particles are typically larger than what size?

A

10 micrometers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What property of a particle is MOST important for gas-solid separation using simple
methods?

A

Size

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the main resistance to motion for particles smaller than 100 micrometers in a gas
stream?

A

Viscosity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the unit typically used for particle size in gas-solid separation?

A

Micrometers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

In gas permeation membranes, what is the main driving force for separation?

A

Pressure difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Flat membranes offer what advantage in gas permeation processes?

A

Ease of fabrication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which type of membrane has the highest membrane area per unit volume in gas permeation
processes?

A

Hollow fiber membranes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

In cross-flow models for gas separation by membranes, which stream is typically assumed
to be in plug flow?

A

Feed stream only

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

In the complete-mixing model for gas separation by membranes, what is a limitation?

A

It is not accurate for high recovery processes.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

In gas-solid separation, what can be recovered as a valuable product in dry state?

A

Powdered catalyst

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the relationship between aerodynamic diameter and the settling velocity of a
particle?

A

They are directly proportional.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

In gas permeation, what is the effect of temperature on permeability generally?

A

Permeability decreases significantly.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the main advantage of using complete-mixing models for gas separation by
membranes?

A

They are simpler to calculate compared to other models

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Gas permeation membranes rely on a _____ as the driving force for separation

A

pressure difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In a cyclone separator, the _____ force acts on a particle in the outward radial direction.

A

centrifugal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Early gas permeation membranes were limited by their low _____ .

A

permeability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The ideal separation factor (α) in gas permeation represents the ratio of the _____ of two
components in the mixture.

A

permeabilities

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The _____ of a gravity settling chamber is determined by the particle trajectory within
the unit.

A

efficiency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

(A) Gas-solid separation processes are always used to improve air quality. (B)The size of
a particle is the only factor affecting its settling velocity in a gas stream

A

Both statement A and B are False

Explanation (A) -While improving air quality is a common application, gas-solid separation
can also be used to recover valuable products or remove harmful pollutants from process
streams in various industries.

Explanation (B) - Particle size is a crucial factor, but other factors like particle density, shape,
and the gas viscosity also influence settling velocity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

The separation of solid particles from a suspension consists of fine particles of different
materials in water using a flotation technique depends upon the differences in the

A

surface properties of the solid particles being used

22
Q

Theoretical cut particle size for a gas cyclone is

A

The theoretical size of the standard

23
Q

Which of the three phases of matter (solid, liquid, or gas) has particles separated by the
least amount of distance?

A

solid

24
Q

The accurate prediction of permeabilities of gases in membranes is generally not possible, and experimental values are needed.

A

Permeability of membranes

25
Q

The grade efficiency of gravity settling chambers can be calculated based on particle trajectory within the unit. The best-established models of collector performance
are those for fibrous filters and fixed-bed granular filters, in which the structures and fluid-flow patterns are reasonably well defined.

A

Only the first statement is true

26
Q

Inertial separators in which particles are separated from the gas by inertial impingement
collecting bodies arrayed across the path of the gas stream.

A

Impingement Separators

27
Q

It is a performance of a gas-solids separation device is most commonly expressed as the ______ n, the weight ratio of the dust collected to the dust entering the
apparatus.

A

Collection efficiency

28
Q

The feed enters the cyclone _____ near the top and is given a spinning motion as it enters the _____.

A

Tangentially, chamber proper

29
Q

Which of the following applications of cyclones is not found in industries involved with fluid-particles processing?

A

Pharmaceutical

30
Q

It is in the opposite direction to the particle’s centrifugal force because it is on a volume of fluid that is missing compared to the surrounding fluid.

A

buoyant force

31
Q

In a conventional reverse-flow cyclone, the _________ usually enters a cylindrical or conical chamber tangentially at one or more entrances (usually
rectangular in cross section) and leaves through a central opening

A

dust-laden gas

32
Q

In deriving theoretical models for gas separation by membranes, isothermal conditions and negligible pressure drop in the feed steam and permeate stream are
_______

A

generally assumed

33
Q

At what percent efficiency is it possible for a coarse dust to be collected wherein a fine dust may be separated with lower efficiency in the _____ operating at exactly the same conditions?

A

100% efficiency , same unit

34
Q

Gravity collectors are generally built in the form of long, empty, horizontal, rectangular chambers with an inlet at one end and an outlet at the side or top of the other end.

A

Inlet , Outlet

35
Q

What are the two types of solid dispersed in gases?

A

Fume and Dust

36
Q

For preliminary selection, the analytical cut diameter can be estimated from the particle-size distribution of the incoming dust

A

Particle-size distribution

37
Q

Very fine particles tend to agglomerate into a loose,_______ whereas coarse particles may
be nonporous and dense

A

Porous structure

38
Q

It plays an important role in its ability to be entrained and remained in suspension.

A

Particle Density

39
Q

In a reverse flow cyclones, the gas moves in a double vortex with a gas initially spiraling downward at the outside after it enters the inlet,, the flowing upward in the center of cyclones before it exist

A

flow pattern

40
Q

For any separators device, the relative contribution of various collection mechanism depends on what characteristics

A

Particle and gas characteristics

41
Q

Devices that particles are separated from a dust-laden stream when the direction pf gas flow is line but continue to be concentrated in the dust stream

A

Louver and Baffle Collectors

42
Q

In a type of permeates it says (A)In a membrane process high-pressure feed pas is supplied to one side of the membrane and permeates normal to the membrane.(B) The
permeate leaves in a direction normal to the membrane, accumulating on the low-pressure side

A

The both statement is true

43
Q

The particle size on a cumulative weight percent oversize distribution curve that is numerica
the _______

A

desired overall collection efficiency of the gas-solid separation device.

44
Q

The ________ measurement is one of the common methods for obtaining a relative long-period evaluation of particulate air pollution

A

dust-fall

45
Q

Dusts usually result from mechanical disintegration of matter.
Fuse are submicrometer dispersed solids formed by processes such as combustion,
sublimation, and distillation.

A

Only the first statement is true

46
Q

Due to______, the particles do not follow the gas streamlines but continue to be concentrated in the dust stream.

A

Inertia

47
Q

The tangential entry of gas creates a swirling flow within the cyclone body that imparts a substantial centrifugal separating force on the particles

A

Imparts

48
Q

When a separator element is operated at low recovery, there is a minimal change in
______

A

Composition

49
Q

Which of the following example given for Chemical in fluid-particle processing is not
included?

A

Distillating

50
Q

For the design of a system there are _____ variables in the complete-mixing model

A

seven

Particle Technology (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions