Transition and Turbulent Flow of GNF in Pipes-2 — Lesson 2

This lesson covers the complex topic of transport phenomena of non-Newtonian fluids, focusing on the transition and turbulent flow of generalized Newtonian fluids in pipes. It delves into the criteria for transition from laminar to turbulent flow, the critical Reynolds number for different types of fluids, and the concept of friction factors. The lesson also discusses the velocity profiles for laminar flow and turbulent flow conditions, and how these profiles can be affected by factors such as pipe roughness and fluid behavior. It further explains the mathematical representations and empirical correlations used to describe these phenomena. The lesson concludes with practical examples and problem-solving exercises to reinforce the concepts learned.

Video Highlights

01:40 - Explanation of the Ryan and Johnson model and the Mishra and Tripathi model for determining the critical Reynolds number.
16:11 - Discussion on the velocity profiles measurement in turbulent flow of power-law fluids in pipes.
39:12 - Derivation of the velocity profile for the laminar sub-layer and the turbulent core close to the wall.
54:42 - Discussion on the velocity profile for the transition zone and the turbulent core.
62:21 - Conclusion of the lecture with references for further reading.

Key Takeaways

• The transition from laminar to turbulent flow in non-Newtonian fluids is governed by the critical Reynolds number, which varies for different types of fluids.
• Friction factors play a crucial role in determining the flow conditions in smooth pipes.
• The velocity profiles for laminar and turbulent flow conditions can be mathematically represented and are influenced by factors such as pipe roughness and fluid behavior.
• Understanding these concepts is crucial for predicting and controlling the flow behavior of non-Newtonian fluids in various engineering applications.