Instrument Measurement       Principles       PHYS6008
Flow Measurement
Learning Objectives• When this section is completed the  learner will be able to:• Explain “What is a fluid?”• Describe fl...
What is a fluid?A fluid is a substance that can    flow – liquids or gases
Types of FlowLaminar               Turbulent
Types of Flow    Laminar                                                 FLOW PATTERN• Flow is steady                     ...
Types of Flow                                        Turbulent       FLOW PATTERN                           •    Flow is d...
Reynolds NumberWhat are the units for each parameter?
Symbol                   Units      ρ      fluid density   kg m-3      v      average         ms-2             velocity   ...
• If Re > 3000           Turbulent Flow• If Re = 0 to 2000      Laminar Flow• For 2000 < Re < 3000   Transition region
Example 1• Oil of density 800 kgm-3 flows with a velocity  of 3.0 ms-1 at 20 0C in a pipe of diameter 300  mm.• The viscos...
• If Re > 3000           Turbulent Flow• If Re = 0 to 2000      Laminar Flow• For 2000 < Re < 3000   Transition region
Lecture 1 flow phys6008
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Lecture 1 flow phys6008

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Lecture 1 flow phys6008

  1. 1. Instrument Measurement Principles PHYS6008
  2. 2. Flow Measurement
  3. 3. Learning Objectives• When this section is completed the learner will be able to:• Explain “What is a fluid?”• Describe fluid flow• Differentiate between different types of fluid flow• Calculate Reynolds Number
  4. 4. What is a fluid?A fluid is a substance that can flow – liquids or gases
  5. 5. Types of FlowLaminar Turbulent
  6. 6. Types of Flow Laminar FLOW PATTERN• Flow is steady streamlines• Particles follow streamlines• All particles flowing past a point in the flow will have same velocity Pipe• Velocity profile is parabolic due to the frictional forces between the layers of fluid and between the fluid and the pipe wall. VELOCITY PROFILE
  7. 7. Types of Flow Turbulent FLOW PATTERN • Flow is disorderly • At any position in the flow the velocity is time dependent and eddiespipe occur. • The velocity profile is more uniform. • The velocity is 0 ms-1 at VELOCITY PROFILE the pipe boundaries.
  8. 8. Reynolds NumberWhat are the units for each parameter?
  9. 9. Symbol Units ρ fluid density kg m-3 v average ms-2 velocity d pipe m diameter η fluid viscosity Nsm-2What is the unit of the Reynolds number?
  10. 10. • If Re > 3000 Turbulent Flow• If Re = 0 to 2000 Laminar Flow• For 2000 < Re < 3000 Transition region
  11. 11. Example 1• Oil of density 800 kgm-3 flows with a velocity of 3.0 ms-1 at 20 0C in a pipe of diameter 300 mm.• The viscosity of the oil at 20 0C is 0.110 Nsm-2.• Determine whether the flow is laminar or turbulent?
  12. 12. • If Re > 3000 Turbulent Flow• If Re = 0 to 2000 Laminar Flow• For 2000 < Re < 3000 Transition region
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