Separated Flux Model — Lesson 5

This lesson covers the concept of two-phase flow and heat transfer, focusing on the separated flow model. It explains how both phases flow separately and the existence of relative velocity between them. The lesson also discusses how to calculate pressure drop in a pipeline holding separated flow and in a heated tube. It introduces the Lockhart Martinell parameters and how to evaluate its values from Martinell charts. The lesson also provides a detailed explanation of the mass conservation equation and the momentum equation. It concludes with a practical example of calculating pressure drop in a heated tube using the separated flow model.

Video Highlights

00:33 - Explanation of the separated flow model.
01:49 - Lockhart Martinell parameters and how to evaluate its values.
04:47 - Momentum and continuity equations for separated flow.
06:00 - Calculation of frictional, gravitational, and accelerational pressure drops in the separated flow model.
34:21 - Demonstration on Martinell and Neelson charts to calculate the pressure drop in a heated tube.

Key Takeaways

- The separated flow model considers that both phases are flowing separately with a relative velocity between them.
- The model helps in calculating the pressure drop in a pipeline holding separated flow and in a heated tube.
- The mass conservation equation and the momentum equation are crucial in understanding the separated flow model.
- The Lockhart Martinell parameters are essential in evaluating the separated flow model.
- Practical application of the separated flow model can be seen in calculating pressure drop in a heated tube.