Understanding Two-Phase Flow Regimes — Lesson 2

This lesson covers the different flow regimes in two-phase flow and heat transfer. It explains the various flow regimes available for horizontal, vertical, and phase change scenarios. The lesson delves into the characteristics of each flow regime, including bubbly, slug, churn, annular, and wispy annular flows. It also discusses the factors that influence these flow patterns, such as channel size, orientation, and phase change processes. For instance, the lesson illustrates how the size of bubbles in a flow can change due to merging or breaking, leading to different flow regimes. It also presents flow regime maps that help predict the type of flow pattern for any gas-liquid combination.

Video Highlights

00:32- Explanation of different flow regimes in gas liquid two-phase flow
02:10- Description of different flow regimes in a vertical conduit
04:33 Description of different flow regimes in a horizontal conduit
06:10 - Discussion on the different flow patterns during phase change
13:57 Description of different flow patterns in horizontal configuration

Key Takeaways

- Different flow regimes include bubbly, slug, churn, annular, and wispy annular flows.
- Factors such as channel size, orientation, and phase change processes influence flow patterns.
- Bubbles in a flow can merge, break, or change size, leading to different flow regimes.
- Flow regime maps can predict the type of flow pattern for any gas-liquid combination.
- Understanding these flow regimes is crucial in two-phase flow and heat transfer studies.