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Brief introduction to Laminar flow and Reynolds number.

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### What is laminar flow updated for slideshare

1. 1. What Is Laminar Flow? Original Presentation by Tony Green, B.CHE April 2005 http://www.tonygreen.name © Tony Green 2011 1
2. 2. What Is Laminar Flow? Agenda Applications of Laminar Flow Factors Determining Laminar Flow Description of the Relationship describing Laminar Flow Review / Questions http://www.tonygreen.name © Tony Green 2011 2
3. 3. What Is Laminar Flow? ApplicationsAeronautics Industry - AirFuel Usage of PlanesSemiconductor Industry – InThermal Based Mass FlowControllersPharmaceutical Industry -Unidirectional Flow in LaminarFlow Cabinets (Particles) http://www.tonygreen.name © Tony Green 2011 3
4. 4. What Is Laminar Flow? http://www.tonygreen.name © Tony Green 2011 4
5. 5. What factors determine whether What Is Laminar Flow? flow is laminar?Length of pipe – defined as LDiameter of pipe – defined as Dwhich is 2 times the radius (2R=D) Differential Pressure – P fromthe pipe inlet to pipe outlet or P2-P1Density of fluid – Mass per unitVolumeViscosity of fluid – resistance of afluid to flow,R http://www.tonygreen.name http://www.tonygreen.name © Tony Green 2010 © Tony Green 2011 5
6. 6. What Is Laminar Flow? Please Note: Viscosity Is Dependent Upon Temperature of a Fluid and Refer to Flow Density Is Intrinsic to the Fluid and Does Not Change During Flow http://www.tonygreen.name © Tony Green 2011 6
7. 7. What Is Laminar Flow? Flow region is defined by Reynolds Equation RE = D X X Where D equals Diameter , equals Velocity, equals density and equals viscosity Dimensionless allows scalability http://www.tonygreen.name http://www.tonygreen.name © Tony Green 2011 © Tony Green 2011 7
8. 8. What Is Laminar Flow? Flow Regions: Laminar = RE < 2100 Transitional = 2100< RE < 4000 Turbulent = RE > 4000 http://www.tonygreen.name © Tony Green 2011 8
9. 9. What Is Laminar Flow? http://www.tonygreen.name © Tony Green 2011 9
10. 10. What Is Laminar Flow? http://www.tonygreen.name © Tony Green 2011 10
11. 11. What Is Laminar Flow? What does the Reynolds Number really mean? Viscous forces – Internal to fluid Inertial Forces – External to fluid RE of the ratio between Inertial and viscous forces of FI RE = ---- Fv This will determine property of flow http://www.tonygreen.name http://www.tonygreen.name © Tony Green 2011 © Tony Green 2011 11
12. 12. What Is Laminar Flow? Review: What is Laminar Flow? What is the difference between Viscosity and Density? What is Reynolds Equation? Laminar flow affect in applications? http://www.tonygreen.name © Tony Green 2011 12
13. 13. What Is Laminar Flow? Thank You very much for your time! More about the author can be read at the author website listed below or his blog athttp://www.markanthonygreen.blogspot. com http://www.tonygreen.name © Tony Green 2011 13