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INST 262 > Flow Terms > Flashcards

Flow Terms Flashcards

1
Q

The quantity of fluid passing a point at a particular moment

A

Flow Rate

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2
Q

s the quantity of fluid that passes a point during a specific time period

A

Total Flow

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3
Q

Density

A

Fluids mass per unit volume

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4
Q

The ratio of fluid density to the density of a reference fluid

A

Relative Density

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5
Q

The resistance to the flow of fluid and has the units of centipoise(cP) (in the SI system Pa .s or kg/(s.m)

A

Absolute Viscosity

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6
Q

The ratio of absolute viscosity to fluid density and has the units of centistokes(cS) (in the SI system m2/s)

A

Kinematic Viscosity

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7
Q

Reynolds Number

A

The ratio between the inertial forces moving a fluid and viscous forces resisting that fluid.

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8
Q

Smooth fluid flow that has a flow profile that is parabolic in shape with no mixing between the streamlines.

A

Laminar Flow

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9
Q

Fluid flow in which the flow profile is flattened parabola, the streamlines are not present and the fluid is freely intermixing

A

Turbulent Flow

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10
Q

Incompressible Fluid

A

Is a fluid where there is little change in volume when subjected to a change in pressure

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11
Q

Is a fluid where the volume and density change when subjected to a change in pressure

A

Compressible Fluid

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12
Q

Is an accepted set of temperature and pressure conditions used for measurement

A

Standard Condition

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13
Q

Flowing Condition

A

Is the temperature and pressure of the gas or vapour at the point of measurement

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14
Q

A law that states that the absolute pressure of a given quantity of gas varies inversely with its volume provided temperature remains constant

A

Boyle’s Law

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15
Q

A law that states that the volume of a given quantity of gas varies directly with its absolute temperature provided the pressure remains constant

A

Charles Law

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16
Q

Gas law that states that the absolute pressure of a given quantity of a gas varies directly with its absolute temperature provided the volume remains constant

A

Gay-Lussac’s Law

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17
Q

Ideal Gas Law

A

The ideal gas law is the equation of state of a hypothetical ideal gas, often written in the form of PV= nRT

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18
Q

A Pipeline restriction that causes a pressure drop used to measure flow.

A

Primary Flow Element

19
Q

A device that senses the differential pressure created by a primary flow element, usually a DP transmitter

A

Secondary Flow Element

20
Q

States that, in any steady state process, the rate at which mass enters a system is equal to the rate at which mass leaves the system.

A

Continuity Equation

21
Q

The sum of the pressure heads of an enclosed flowing fluid is the same at any two locations.

A

Bernoulli Equation

22
Q

Flow meters that use the DP pressure across a restriction in a pipe to infer the flow rate through the pipe

A

Differential Pressure Flowmeters

23
Q

A Primary flow element consisting of a thin circular metal plate with a sharp-edged round hole in it

A

Orifice Plate

24
Q

A Primary flow element consisting of a restriction shaped like a curved funnel that allows a little more flow than an orifice plate and reduces the straight run pipe requirements.

A

Flow Nozzle

25
Q

A Primary flow element Consisting of a fabricated pipe section with a converging inlet section, a straight throat, and a diverging outlet section.

A

Venturi Tube

26
Q

Pitot Tube

A

A flow element consisting of small bent tube with a nozzle opening facing into the flow.

27
Q

Is a tube consisting of several impact openings inserted through the wall of a pipe or duct and extending across the entire flow profile

A

Averaging Pitot Tube

28
Q

Is an Emerson Process Management registered trademark name for its averaging Pitot tube design

A

Annubar Flowmeter

29
Q

Where a physical target is located directly in the fluid flow, the deflection of the target and the force bar is measured by the instrument

A

Target Flowmeter

30
Q

Is a flow meter with a centrally-located cone inside the flow tube which created a differential pressure proportional to the flow rate

A

V-Cone Flowmeter

31
Q

Orifice pressure taps or sensors located immediately upstream and downstream of the orifice plate

A

Corner Tap

32
Q

The tubing or piping connection that connects the flowmeter taps to any of the differential pressure instruments.

A

Impulse Lines

33
Q

Beta Ratio

A

The Ratio between the diameter of the orifice plate (d) and the internal diameter of the pipe (D)

34
Q

is the ratio of the true flow to the theoretical flow and is applied to the theoretical flow equation to obtain the actual (true) flow

A

Coefficient of Discharge

35
Q

Change in velocity between the upstream meter tube and the velocity in the orifice bore

A

Velocity of Approach

36
Q

Throat

A

May be considered the bore or diameter of the orifice opening in the orifice plate

37
Q

The region before the orifice pate with respect to direction of fluid flow

A

Upstream

38
Q

The region after the orifice pate with respect to direction of fluid flow

A

Downstream

39
Q

The pressure loss due to a restriction in a pipe that is used to cause a pressure differential for flow measurement

A

Residual (permanent) Pressure Loss

40
Q

Turndown Ratio

A

The Ratio of the maximum flow to the minimum measurable flow at the desired measurement accuracy.

41
Q

Meter Run

A

Consists of an orifice fitting, upstream section of pipe and downstream section of pipe (& conditioner if required)

42
Q

taps placed 25.4mm (1 inch) upstream and downstream of the orifice plate, normally within specialized pipe flanges

A

Flange Tap

43
Q

Taps for connection to the secondary device on a orifice tube where the upstream tap is 2.5 pipe diameters and the downstream tap is located 8 pipe diameters from the orifice plate

A

Pipe Tap

INST 262 (5 decks)

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