Measurement of flow rate in a tube and wall skin friction

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Presentation transcript:

Measurement of flow rate in a tube and wall skin friction Prof. Václav Uruba IT ASCR, CTU Praha, UWB Plzeň

Flow measurement in tubes November 28, 2018

Flow measurement in tubes Turbines, multirotor Energy (pressure) loss Ultrasonic principle Coriolis Rotameter Vortex generation Thermal flowmeters November 28, 2018

Turbines Axial Radial Flow rate  revolution speed November 28, 2018

Multirotor Flowmeters Plane Helical November 28, 2018

Energy loss Energy loss ≈ flow rate November 28, 2018

Pressure loss Orifice Plate Segmental Wedge Nozzle November 28, 2018

Differential pressure flowmeters Venturi Tube Averaging Pitot Tube Elbow November 28, 2018

Ultrasonic flowmeters Transit Time Ultrasonic Flowmeter Doppler Ultrasonic Flowmeters Mean velocity - flowrate Velocity profile November 28, 2018

Coriolis flowmeters Changing natural vibration November 28, 2018

Rotameter drag gravity November 28, 2018

Vortex Flowmeter Strouhal frequency November 28, 2018

Thermal Flowmeters November 28, 2018

Skin friction measurement November 28, 2018

Skin friction measurement Pressure measurement Hot film Floating element Oil film Liquid crystals November 28, 2018

Pressure Preston tube Stanton tube Fence November 28, 2018

Hot Film Probes November 28, 2018

Floating Element Flow November 28, 2018

Oil Film November 28, 2018

Liquid Crystals Films – not encapsulate Paints shear-sensitive liquid crystal coating (SSLCC) - NASA Ames November 28, 2018

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