Behavior of Viscoelastic Non-Newtonian Fluids — Lesson 4

This lesson covers the concept of Transport Phenomena of Non-Newtonian Fluids, focusing on Viscoelastic Non-Newtonian fluids. It delves into the characteristics of Newtonian fluids and how they differ from non-Newtonian fluids. The lesson further classifies non-Newtonian fluids into time-independent, time-dependent, and viscoelastic non-Newtonian fluids. It explains the behavior of viscoelastic fluids, which exhibit both viscous and elastic behavior. The lesson also discusses mathematical models that represent viscoelastic fluid behavior, such as the Maxwell model and the Kelvin-Voigt model. It provides real-life examples to illustrate the viscoelastic behavior in fluids, like proprietary soups and polyisobutylene in polybutene solution. The lesson concludes with a discussion on the dimensional considerations for viscoelastic fluids, including the Maxwellian relaxation time and the Deborah number.

Video Highlights

00:34 - Explanation of Viscoelastic Non-Newtonian fluids
19:55 - Introduction to mathematical models for viscoelastic fluids
28:44 - Explanation of the Maxwell model
41:09 - Explanation of the Kelvin-Voigt model
45:10 - Discussion on dimensional considerations for viscoelastic fluids

Key Takeaways

• Non-Newtonian fluids exhibit different characteristics based on time dependency and viscoelasticity.
• Viscoelastic fluids display both viscous and elastic behavior, which can be represented by mathematical models like the Maxwell and Kelvin-Voigt models.
• Real-life examples, such as proprietary soups and polyisobutylene in polybutene solution, can exhibit viscoelastic behavior.
• The Maxwellian relaxation time and the Deborah number are important dimensional considerations for viscoelastic fluids.