Definition of Terms (Flow Unit)

Question 1

Cohesion Def

Answer 1

Ability of a liquid to stick to itself/resist tensile stress -> Common result of cohesive forces: surface tension)

Question 1

Viscosity Def

Answer 1

Measurement of a fluid’s deformation resistance -> Oil is higher than water

Question 2

Adhesion Def

Answer 2

Ability of a liquid to stick to solid surfaces

Question 3

Surface Tension Def

Answer 3

Result of cohesive forces on the surface of a liquid

Question 4

Capillary Action Def

Answer 4

Capillary Action due to both cohesive and adhesive (E.g. meniscus in manometer)

Question 5

Processes where flow is measured:

Answer 5

1. Gas flow
2. Oil flow
3. steam flow
4. solids flow (e.g. sand, cement)
5. water flow
6. chemical flow
7. suspended solids flow (e.g. slurries)

Question 6

Liquid units of measurement:

Answer 6

Gal/min, Liters/min, m^3/min, cm^3/min

Question 7

Gas units of measurement:

Answer 7

s.c.f.m., m^3/min

Question 8

Steam units of measurement:

Answer 8

Ibs/hr, kg/hr

Question 9

Oil units of measurement:

Answer 9

Barrels/hr, Liters/hr

Question 10

Solids units of measurement:

Answer 10

Tons/hr

Question 11

Vapour Pressure Def

Answer 11

Boiling point of liquid at given temperature/pressure when liquid will vaporize at a constant temperature

Question 12

Cavitation Def

Answer 12

• Changing of state
• Liquid -> gas -> liquid
• Caused by change in pressure

Question 13

Laminar Flow Def

Answer 13

Smooth flow
Slow velocity
no turbulence

Question 14

Turbulent Flow Def

Answer 14

Mixing of fluid due to velocity, restrictions, or bends in pipe

Question 15

Bermoulli’s Principle Def

Answer 15

Increase in speed occurs at point of decrease in pressure of a fluid

Question 16

Head Meter Def

Answer 16

Flow meter -> operation depends on change of pressure head

Question 17

Variable Area Flowmeter Def

Question 18

Positive Displacement Meter Def

Answer 18

Traps and measures volume of of fluid to get flow rate

Question 19

Mass Flow Meter

Answer 19

Measures mass of fluid or gas passing through pipe