ULTRASONIC VELOCITY PROFILE MEASUREMENTS IN PIPES AND FLUMES IN A HYDRAULIC LABORATORY

At the Hydraulic Laboratory Graz, Austria, an UVP-Monitor was used to measure flow velocities in pipes and flumes. Moreover the same device was used for measuring the surface level in a flume. Velocity profile measurement was successfully conducted on a physical model of a multi-pipe inverted siphon with three Plexiglas pipes ranging from 62 mm to 246 mm in diameter. Turbulent flow within the pipes was studied under non-intrusive conditions by installing the ultrasonic transducer on the pipe wall. The velocity profiles were obtained by moving the transducer around the pipe to four angles (0°, 45°, 90°, 135°). Measurements in a flume included simultaneous measurement of velocity profiles and fluid surface profiles for wavy flows. These experiments were performed in a horizontal glass channel. The transducer was inserted from above the test section into the medium facing the direction of flow. The transducer axis was placed at various angles to the surface of the water. In the same horizontal channel, water level measurement for wavy flow was performed. 1. TESTS ON PIPE FLOW 1.1 Model stan