Improvements of Lockhart Martinelli Correlation — Lesson 9

This lesson covers the improvements of the Lockhart Martinelli correlation, a method used to predict pressure drop in two-phase flow in pipes. The lesson begins with an explanation of the initial application of the correlation for adiabatic two-phase, two-component flow systems in horizontal pipes. It then discusses the modifications suggested by researchers, including the incorporation of flow pattern changes and the influence of mass flux. The lesson also covers the modifications proposed by Martinelli and Nelson for two-phase, two-component systems at low pressure. The lesson concludes with a discussion on the Baroczy correlation, which is used for fluids other than air-water or steam-water mixtures.

Video Highlights

00:18 - Introduction to the improvements of the Lockhart Martinelli correlation
08:33 - Discussion on the limitations of the Martinelli and Nelson correlation for other fluids and the need for the inclusion of a surface tension parameter
14:54 - Introduction to the Baroczy correlation for fluids other than steam water
48:30 - Discussion on the application of the homogenous, drift flux, and separated flow model for different flow situations
51:59 - Explanation of the importance of analyzing the flow distribution and arrangement of the two fluids based on the desired pressure drop

Key Takeaways

- The Lockhart Martinelli correlation was initially applied for adiabatic two-phase, two-component flow systems in horizontal pipes.
- Researchers suggested modifications to the correlation to account for changes in flow patterns and the influence of mass flux.
- Martinelli and Nelson proposed modifications for two-phase, two-component systems at low pressure.
- The Baroczy correlation is used for fluids other than air-water or steam-water mixtures.