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ee notes - EE 4770 Lecture Notes Generated from file...

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EE 4770 Lecture Notes Generated from file lsli11.dvi. This page was generated using an imperfect translator. Text may be poorly positioned and mathematics will be barely readable. Illustrations will not show at all. If possible, view the PostScript or PDF versions of these notes. 11-1 Flow * * 11-1 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. When fluid incompressible : : : : : :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 8:20, 24 February 1999 from lsli1* *1. 11-1 11-2 *
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* 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 8:20, 24 February 1999 from lsli1* *1. 11-2 11-3 Rotation Sensors * * 11-3 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. Typical Construction. Turbine placed in flow in a plastic section of pipe. Turbine blades made of metal. Magnetic reluctance transducers placed outside pipe near blades. Flow causes turbine to spin.
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11-3 EE 4770 Lecture Transparency. Formatted 8:20, 24 February 1999 from lsli1* *1. 11-3 11-4 * * 11-4 Model Function This includes the turbine, the magnetic reluctance sensor, a conditioning circuit, and a frequency counter. Ht1 (x) = k x, 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 8:20, 24 February 1999 from lsli1* *1. 11-4 11-5 Paddle Wheel/Speed Measurement Example * * 11-5 Design a system to convert process variable x 2 [0; 80 ml__s], flow in a pipe, into a floating-point number H (x) to be written into variable paddleFlow, where 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
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ee notes - EE 4770 Lecture Notes Generated from file...

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