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Chapter 6: Flow Measurement & Measurement of Liquid Level. - Coggle…
Chapter 6: Flow Measurement & Measurement of Liquid Level.
Flow Measurement.
A technique used in any process requiring the transport of a
material from one point to another.
Types of Flow.
If Re < 2000 = laminar flow.
If Re > 4000 = turbulent flow.
If 2000<= Re <= 4000 = Critical zone between Laminar and Turbulent flow.
Basic knowledge
Bernoulli's equation.
A statement of the conservation of
energy principle appropriate for flowing fluids
Reynolds
Number
Flow measuring devices category.
Primary devices (quantity meter)
Measure the amount of fluid in terms of mass or volume that flows past a given point in a definite period of time.
Nutating Disc Meter.
The simple and reliable operating principle allows water to flow into the chamber, which causes the disc to nutate.
Application: domestic water
system
Sliding-Vane-Type Meter
Vane type positive displacement flow meter, creating high accuracy measurement and low pressure loss by decreasing rotation resistance. ... Measurement in high accuracy is possible as rotorVrotates at constant speed.
Lobed-impeller Meter.
Lobed Impeller Flow Meters Working Principle. Two rotating impellers, designed with a figure eight cross section, rotate in opposite directions due to the forces exerted by the gas flow being measured. The shape of the impellers prevents contact while the gap between them remains constant.
Secondary devices (rate meter)
They not measure the flow directly but instead measure another physical quantity which related to flow.
Pitot Static Tube.
Working Principle: The fluid flowing through the pipeline enters the pitot tube and rest there. There is another chamber within the pitot tube filled with fluid with static pressure. A diaphragm separates both the chambers.
