Two-Phase Flow Parameter Measurement — Lesson 2

This lesson covers the measurement of two-phase flow parameters, focusing on the measurement of void fraction. The instructor discusses the importance of understanding the composition of two-phase systems, particularly in relation to pressure drop measurements. The lesson also delves into the factors that influence the composition of two-phase systems, such as the distribution of the two phases, flow rates, physical properties, and conduit dimensions. The instructor further explains the different techniques for measuring void fraction, including volume measurement, radioactive absorption and scattering, and impedance techniques. The lesson concludes with a discussion on the challenges and considerations in using these techniques.

Video Highlights

00:17 - Introduction to the measurement of two-phase flow parameters and the importance of measuring the composition of two-phase flow
08:20 - Detailed explanation of the radioactive absorption and scattering technique, including its advantages and disadvantages
14:59 - Discussion on the importance of calibration in radiation absorption techniques and the challenges in handling radiations
18:23 - Overview of other radiation techniques used for void fraction measurement, including radiation scattering techniques and techniques that liberate consequential radiation from the two-phase mixture
19:58 - Conclusion and summary of the discussion on the measurement of two-phase flow parameters

Key Takeaways

- Understanding the composition of two-phase systems is crucial in pressure drop measurements and predicting hydrodynamic parameters.
- The composition of two-phase systems is influenced by various factors, including the distribution of the two phases, flow rates, physical properties, and conduit dimensions.
- Different techniques for measuring void fraction include volume measurement, radioactive absorption and scattering, and impedance techniques.
- Each technique has its own set of challenges and considerations, such as the need for accurate initial measurements, the influence of void orientation, and the handling of radiations.