Fluid Mechanics Flashcards

1
Q

equilibrium of liquids and the pressure exerted by liquid at rest.

A

hydrostatic

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2
Q

two equations in hydrostatic

A
  1. for constant density fluids (most liquids)
  2. barometric equations (for ideal gas)
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3
Q

two applications

A
  1. simple manometers
  2. two fluid u-tube manometer
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4
Q

hydrostatic equilibrium is

A

fluid statics

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5
Q

three equations for fluid dynamics

A
  1. continuity equations
  2. Overall energy balance equation
  3. mechanical energy balance (MEB) equation
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6
Q

two types of flow in mechanical energy balance equation

A
  1. flow of compressible fluids
  2. flow of incompressible fluids
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7
Q

3 types of incompressible fluids

A

subsonic flow
sonic flow
supersonic flow

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8
Q

actual velocity/velocity of sound

A

mach number

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9
Q

When Mach number is less than 1.0 or V is less than C ( less than the speed of sound), then the flow is called

A

subsonic

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10
Q

When Mach number equal to 1.0 or V is equal to C, then the flow is called

A

Sonic Flow

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11
Q

When Mach number is greater than 1.0 or V is greater than C (greater than the speed of sound) , then the flow is called

A

Supersonic Flow

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12
Q

where hydraulic diameter is applicable in replacement of diameter if flow is turbulent and completely filled

A

non-circular conduits

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13
Q

if flow is laminar and completely filled use

A

equivalent diameter

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14
Q

for power consumptions for the transport gases in fans use the mechanical energy balance equation for _________________. Considering that delta p is small and density between the two are similar

A

incompressible fluids

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15
Q

the power consumption for the transport of gases when blowers are involved use the equation

A

integral of vdp from p0 to p1

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16
Q

head available at the pump inlet to keep the liquid from cavitating or boiling

A

Net positive suction head (NPSH)

17
Q

4 metering of fluids

A
  1. pitot tube
  2. head meters (orifice, venturi, nozzles)
  3. area meters (rotameters)
  4. meters for open channel flow
18
Q

use the continuity equation and the MEB equation to be solved simultaneously

19
Q

the power loss due to friction in a venturi meter is _____________ an orifice meter

20
Q

fans and blowers are used to

A

transport gases

21
Q

pumps and blowers ____________ the mechanical energy of the fluid

22
Q

a pump will operate safely if its NPSH is

A

greater than zero

23
Q

pump to use in capacity = 5000gal/min and head of 15ft of water

A

axial flow pump

24
Q

to use if the air is to be delivered at a rate of 200 cfm and a pressure of 10kpa

25
in a high pressure piping system where joints are regularly broken for maintenance, __________ joints are used
flanged
26
the resistance of a layer of fluid to flow over the next layer is measured by
viscosity
27
when movement of a gas vapor is effected at a low pressure (eg. 0.1 kg/cm^2) the equipment is
blower
28
the inside surface of the pipe has no effect on the friction factor when the flow is
streamline
29
the higher the BWG rating of a tube is, the lower is the
strength
30
At a given flow rate through an orifice meter the differential pressure across the orifice will increase when
the orifice flow area is decreased
31
The prime mover of a jet pump is a/an
fluid momentum
32
The weight rate of flow of a fluid stream per unit of cross section perpendicalar to the direction of flow is the
mean mass velocity of the stream
33
In a reciprocating pump, the ratio of the quantity of liquid actually pumped to which corresponds to the piston displacement is called
volumetric efficiency
34
The schedule number of the pipe is an indicator of the pipe's
thickness