Understanding Separated Flow Model-1 — Lesson 2

This lesson covers the concept of the separated flow model in fluid dynamics. It delves into the understanding of how different phases of a fluid interact with each other and the wall of the container. The lesson explains the formulation of separate mass momentum and energy balance equations, and how these equations change with phase change and mass transfer. It also discusses the derivation of the momentum balance equation for different flow situations. The lesson further elaborates on the conditions of choking and the empirical approaches to determine certain parameters.

Video Highlights

00:18 - Introduction to the separated flow model and its importance in understanding the interaction between different phases in a system
07:04 - Discussion on the concept of two-phase multipliers and their role in defining the frictional pressure gradient
12:01 - Explanation of the concept of phase change and its impact on the momentum balance equations
44:56 - The speaker explains the impact of phase change on the momentum equations in two-phase flow
56:27 - The video lesson concludes with a discussion on the empirical approaches to express tau W 1, tau W 2, and to find out alpha in the frictional pressure gradient term

Key Takeaways

- The separated flow model considers two phases of a fluid separately, formulating separate mass momentum and energy balance equations.
- The interaction between the phases and the wall of the container is crucial in this model.
- The momentum balance equation changes with phase change and mass transfer.
- The lesson discusses the derivation of the momentum balance equation for different flow situations, including annular flow and packed bed situations.
- The conditions of choking and the empirical approaches to determine certain parameters are also discussed.