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Practical Industrial Flow Measurement for Engineers and Technicians
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Transcript of Practical Industrial Flow Measurement for Engineers and Technicians
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Practical Industrial Flow Measurement for Engineers
and Technicians
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Industries involved in flow measurement and control include: food and beverage;medical;mining and metallurgical; oil and gas transport; petrochemical;pneumatic and hydraulic transport of solids;power generation; pulp and paper; andwater distribution.
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Stationary plate
Moving plate
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Shear
Shear stress Shear rate
or:
Shear stress = µ. Shear rate
where:
µ = dynamic viscosity ( Pa.s)
Formerly = poise
where:
1 Pa.s = 10 poise
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Comparison of the viscosities of various fluids.
Fluid Temperature(C)
Viscosity (Pa.s)
Molasses 20 100Glycerine 20 1,5Engine oil (SAE 10) 30 0,2Milk 20 5 x 10 -3
Blood 37 4 x 10 -3
Water 0 1,8 x 10 -3
Ethyl alcohol 20 1,2 x 10 -3
Water 20 1 x 10 -3
Water 100 0,3 x 10 -3
Air 20 0.018 x 10 -3
Water vapour 100 0,013 x 10 -3
Hydrogen 0 0,009 x 10 -3
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Shear rate
Shearstress
Yield point
Newton
ian
Idea
l plas
tic
Pseudoplastic
Dilatan
t
Non-Newtonian fluids
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Ideal profile
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Laminar profile
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Turbulent profile
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Re = r.v.D/ µ
where:
r = density (kg/m3)
µ = viscosity (Pa.s)
v = mean flow velocity (m/s)
D = diameter of pipe (m)
Laminar Re < 2000
Transitional Re 2000 - 4000
Turbulent Re > 4000
Reynolds number
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Swirl
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Definitions Volumetric flow rate Velocity Point velocity
Mean flow velocity Volumetric flow rate Mass flow rate Rangeability
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