How UVP-DUO Helps to Measure Non-Parallel Velocity Fields in Deformed Elastic Tubes

1 July 2024 by
How UVP-DUO Helps to Measure Non-Parallel Velocity Fields in Deformed Elastic Tubes
Met-Flow SA

Summary of the Experiment:

The study aimed to explore the measurement of non-parallel velocity fields in deformed elastic tubes using Doppler ultrasound flow measurement techniques. The primary objective was to obtain accurate velocity profiles in complex flow geometries, such as those found in physiological conditions or industrial applications. The experiment involved a specially designed setup where an elastic tube was deformed, and the flow characteristics were measured under these conditions.

UVP-DUO Usage:

The UVP-DUO system played a crucial role in capturing the detailed velocity profiles in the deformed elastic tube. Key setup parameters included:

- Ultrasonic Frequency: 8 MHz

- Transducer Diameter: 2 mm active, 5 mm housing

- Measurement Solution: Aqueous solution of 1.5% carboxymethyl-cellulose (CMC) with 0.3% polyamide particles

- Flow Rate: 144 ml/min

- Tube Dimensions: 2 cm diameter, 0.1 cm wall thickness

- Sound Velocity: 1499 m/s in the solution, 992 m/s in the tube wall

The UVP-DUO was used to measure velocity profiles along two perpendicular lines in the tube, allowing for the reconstruction of the real velocity vector and its components.

Result of the Experiment and How UVP-DUO Contributed:

The experiments demonstrated that using multiple transducers in perpendicular arrangements allowed for accurate measurement of the real velocity vector in the deformed tube. Key findings included:

- The standard single transducer method resulted in non-symmetric velocity profiles, which led to significant errors in flow characterization.

- The new approach with multiple transducers provided symmetric and accurate velocity profiles, even in the presence of complex flow geometries.

- The precise measurements of the UVP-DUO enabled the identification of real velocity vectors and their components, improving the accuracy of subsequent data processing, such as shear rate calculations.

Overall, the UVP-DUO significantly contributed to the study by providing high-resolution velocity profiles, essential for understanding flow dynamics in deformed elastic tubes. This research highlights the effectiveness of advanced ultrasonic Doppler methods in complex flow scenarios, offering valuable insights for both physiological and industrial applications.

Read the full scientific paper in our Digital Library here.

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