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Day 2 - Chemical Engineering Principles > Momentum Transfer > Flashcards

Momentum Transfer Flashcards

1
Q

The viscosity of a gas

A

increases with increase in temperature

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2
Q

It is a dimensionless number that characterizes the flows of a fluid in a conduit

A

Reynolds number

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3
Q

Turbulent flow occurs for cases involving
a. viscous fluid
b. very narrow passages for capillary tube
c. very slow motions
d. none of these

A

D.

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4
Q

The Reynolds number for ideal fluid flow

A

Infinity

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5
Q

Formula for mass flow rate

A

volumetric flow rate (Qv) x density

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6
Q

Formula for volumetric flow rate (Qv)

A

Velocity x Cross Sectional Area of a Pipe

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7
Q

Formula for mass velocity (G)

A

mass flow rate/area

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8
Q

Momentum Transfer Chapter in Perry’s Handbook

A

Chapter 6

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9
Q

Actual work formula for pumps (positive work displacement)

A

Work ideal/ efficiency

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10
Q

Actual work formula for turbines (negative work displacement)

A

Work ideal x efficiency

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11
Q

When a fluid flows through a reducer in a piping system, the velocity at the outlet end is __ the velocity of the inlet.

A

More than

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12
Q

The connector used for pipes that must be broken at intervals for maintenance

A

Union

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13
Q

Which valve is used accurately to regulate the flow of fluids and gases at low flow rates?

A

Needle valve

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14
Q

Which of the following is NOT true?
a. A pump will operate safely if its NPSH is greater than zero.
b. Fans and blowers are used to transport gases.
c. Pumps and blowers increase the mechanical energy of the fluid.
d. The power loss due to friction in a venturi meter is greater than in an orifice meter.

A

D.

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15
Q

Which statement is not true?
a. Potential flow is a flow of compressible fluids with no shear.
b. Rotameters are variable-head meters.
c. There are 8 schedule numbers in used for standard pipes.
d. Roughness has no appreciable effect on the friction factor when flow is laminar.

A

C. (10 schedule numbers are available)

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16
Q

Friction loss formula

A

FL = (2fLV^2/gcD)

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17
Q

The formula for area of rectangular duct (non-circular conduit)

A

A= ab/2(a+b)

18
Q

The formula for the area of annular space (non-circular conduit)

A

A = pi/4 (D^2-d^2)

19
Q

The formula for friction loss due to pipe fittings (Ff)

A

Ff = kfV^2/2gc

20
Q

The formula for head loss

A

E = Hg/gc (where H = head loss in length)

21
Q

Viscous flow is also?

A

Laminar flow

22
Q

Equation used for finding f for natural gases?

A

Weymouth Equation
f = 0.008/D^(1/3)

23
Q

Formula for viscosity when kinematic viscosity is given

A

Kinematic viscosity x density

24
Q

Mach number formula for compressible fluids

A

V/Vmax

25
Q

Vmax formula for compressible fluids

A

Sqrt (RT/MW)

26
Q

Other formula for Reynolds number

A

DG/viscosity (where G is mass velocity)

27
Q

Compression ratio (r) formula

A

r = nthroot (pressure of last stage compressor/pressure of first stage compressor)

where n is the no. of stages

28
Q

How do you determine the pressure in between stages of compressors?

A

Multiply each inlet pressure with the compression ratio

29
Q

Darcy friction factor (fD) formula

A

fD = 4f (four times the fanning friction factor)

30
Q

Formula for delta H in pitot tubes

A

delta H = Hm ((SGM/SG)-1) (g/gc)

where Hm = manometer reading
SGM = spec. gr. of fluid in manometer
SG = spec. gr. of fluid in pipe

31
Q

Ratio of V/Vmax for laminar flow

A

0.5

32
Q

For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poiseuille equation predict the volumetric flowrate to be proportional to

A

R^4

33
Q

Pipes having diameter 14 inches or more are designated by their

A

Outside Diameter

34
Q

When the flow is laminar

A

The pressure drop is proportional to the first power of the velocity.

35
Q

Most commonly used joint in the underground pipe lines is the

A

Sleeve joint

36
Q

Schedule number of a pipe, which is a measure of its wall thickness, is given by

A

1000 P’/S

37
Q

Water hammer in a pipeline result from the

A

rapid pressure change due to a rapid change in the rate of flow.

38
Q

Molten soap mass is transported by a ____ pump

A

Gear

39
Q

Nominal size of the discharge pipe of a pump is usually_____ the nominal size of the inlet pipe.

A

smaller than

40
Q

Location of vena-contracta in an orificemeter does not depend upon the

A

type of orifice

41
Q

High specific speed of a pump implies that, it is a/an______ pump.

A

Axial flow

Day 2 - Chemical Engineering Principles (8 decks)

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