Measurement_of_fluid_flow

# Measurement_of_fluid_flow - Measurement of fluid flow...

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Measurement of fluid flow Chapter 15 Engineering Measurements Dr. Belal Gharaibeh August 1, 2011

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Flow measurement methods Flow meters 1. Obstruction meters (comprisable and incompressible fluids) a. Venture b. Flow nozzles c. Orifices 2. Velocity probes 1. Pressure probes 2. Scattering techniques
15.2 Flow Characteristics Very low velocity fluid particles “flow in parallel lines with respect to the walls of the conduit (pipe) velocity is large at the center and zero at the wall (laminar flow) At a “critical velocity” the fluid particles motion becomes random and complex and the flow is called turbulent flow

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Flow Characteristics, continue Reynolds number is a dimensionless number used to separate the laminar from turbulent flow : Re=inertial force/viscous force D=a sectional dimension of the fluid stream Ρ =density V=velocity of fluid μ=the absolute viscosity of the fluid
Flow..continue Critical Reynolds number for pipes between 2100 and 4000 Volume flow rate: integral of velocity distribution over the cross sectional area Average velocity Flow meters measure Q and/or V, while velocity probes measure V(x,y)

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