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lsli11 - 11-1 11-1 Flow Measures of Fluid Flow Flow...

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11-1 11-1 Flow Measures of Fluid Flow Flow velocity. Speed of material flowing past a plane. Volumetric flow. Volume of material passing a plane per unit time. Mass flow. Mass of material passing a plane per unit time. If fluid is incompressible then flow velocity, volumetric, and mass flow are proportional. Types of Flowing Fluids to be Measured Liquid in closed conduit. ( E.g. , water in a pipe.) Liquid in an open conduit. ( E.g. , water in a canal.) Gas in an closed conduit. Slurry (solids suspended in liquids) in a closed conduit. Different transducers may be required for each situation. 11-1 EE 4770 Lecture Transparency. Formatted 13:26, 23 December 1997 from lsli11. 11-1
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11-2 11-2 Some Major Types of Sensors Rotation. Fluid forces an object placed in flow to rotate. Speed of rotation is measured. Obstruction. Fluid flow is partially obstructed. Pressure is measured on both sides of obstruction, flow rate deduced. Heat dissipation. A heating element is placed in the flow. Flow rate deduced by amount of heat removed. Head. Measure fluid level flowing into a drop. 11-2 EE 4770 Lecture Transparency. Formatted 13:26, 23 December 1997 from lsli11. 11-2
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11-3 11-3 Rotation Sensors Force of flow causes some object to rotate. Two types will be dis- cussed, turbine and paddle wheel. Turbine Type Used to measure volumetric flow in a closed conduit. Flow Magnetic Reluctance Transducer Plastic Pipe Section Turbine Typical Construction. Turbine placed in flow in a plastic section of pipe. Turbine blades made of metal. Magnetic reluctance transducers placed on outside of pipe near blades. Flow causes turbine to spin. Rate of spin measured by magnetic reluctance sensor. 11-3 EE 4770 Lecture Transparency. Formatted 13:26, 23 December 1997 from lsli11. 11-3
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11-4 11-4 Model Function This includes the turbine, the magnetic reluctance sensor, a condi- tioning circuit, and a frequency counter. H t1 ( x )= kx , where k is a constant called the k factor , having units of one over volume. Paddle Wheel Used to measure volumetric flow in an open conduit. Consists of a wheel partially immersed in the flow. Flow causes wheel to turn. Same model function as turbine flow meter. 11-4 EE 4770 Lecture Transparency. Formatted 13:26, 23 December 1997 from lsli11. 11-4
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11-5 11-5 Paddle Wheel/Speed Measurement Example Design a system to convert process variable x [0 , 80 ml s ] , flow in a pipe, into a floating-point number H ( x ) to be written into vari- able paddleFlow ,wher e H ( x )= x s ml . The value must have a precision of ± 0 . 1 ml s . Use an FP-2502 paddle-wheel flow sensor. Solution Overview Flow Sensor + - V - Counter Reset Clock Register Data In Data Out Buffer and Interface r = readInterface(); Clock Flow sensor generates a voltage pulse train.
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lsli11 - 11-1 11-1 Flow Measures of Fluid Flow Flow...

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