Perpindahan Momentum untuk Fluida Non Newtonian | M .Zaki Riadhus, Aghnisni Fadia H TRKI 2019 UNDIP

Summary

In this video, Muhammad Zaki explains the phenomenon of non-Newtonian fluid dynamics using two key models: the Oswald-DeWi model and the Ellis-Regita model. The video covers the behavior of fluid flow over inclined surfaces and how various conditions affect velocity and distribution. Zaki dives into the mathematical modeling of fluid dynamics, exploring key equations and parameters. The Oswald-DeWi model is discussed in depth, showing how specific fluid characteristics influence the flow, while the Ellis-Regita model is introduced with its flexible parameters, demonstrating a wide range of fluid behaviors. The video concludes with practical applications and further explanations from a colleague.

Takeaways

• 😀 The video explains the phenomenon of fluid transfer, particularly focusing on non-Newtonian fluids.
• 😀 The Oswald Dewi and Elis Regita models are key to understanding fluid dynamics in specific conditions.
• 😀 The speaker, Muhammad Zaki, introduces fluid flow models and the equations associated with them.
• 😀 Fluid flow on inclined surfaces was discussed as a foundational concept for understanding these models.
• 😀 The X and Z coordinates are used to describe fluid flow direction and positioning relative to a surface.
• 😀 When X = 0 and Z = 0, the fluid is at rest, while at Z = max, the velocity is maximal due to distance from the surface.
• 😀 In the Oswald Dewi model, the equation for fluid behavior is based on the relationship between velocity and gradient, simplified as v(x) = m * x^(n-1).
• 😀 The model allows fluid velocity to be calculated based on the parameters m (constant) and n (index describing fluid behavior).
• 😀 In the Elis Regita model, three parameters (φ, v1, α) govern the fluid's behavior, with the model being more flexible and applicable to various fluid states.
• 😀 The Elis Regita model approximates Newtonian behavior under certain conditions, and the equation is derived through integration and substitution of initial conditions.
• 😀 Both models are used to calculate fluid velocity distribution, with the Oswald Dewi model focusing on simpler power laws and the Elis Regita model allowing for more complex fluid behaviors.

Q & A

What is the focus of the video script?

The video focuses on explaining the phenomenon of fluid flow, specifically the behavior of non-Newtonian fluids, and delves into two models: the Oswalt-Dewi model and the Elis-Regita model.

What is the significance of the Oswalt-Dewi model in fluid dynamics?

The Oswalt-Dewi model helps describe the flow of non-Newtonian fluids by incorporating parameters like power and velocity distribution, which can be used to understand complex fluid behaviors under varying conditions.

How does the script describe the different conditions of fluid flow in relation to X and Z coordinates?

The script explains the different states of fluid flow at specific positions (X and Z coordinates), such as when X=0 and Z=0 (no flow), X=0 with a maximum velocity (movement), and Z=max with zero velocity (flow is stopped).

What is the relationship between the velocity and distance from the surface in the Oswalt-Dewi model?

In the Oswalt-Dewi model, the velocity is maximal when the fluid is farthest from the surface (X=0), and it decreases as the fluid approaches the surface due to friction.

What is the parameter Delta in the Oswalt-Dewi model?

Delta represents the width of the plate in the X direction, and it indicates the position where the fluid flow is still influenced by the surface, although the velocity distribution may be reduced due to friction.

How is the equation for the Oswalt-Dewi model simplified?

The Oswalt-Dewi model equation is simplified by using the power law, leading to a more manageable form where the velocity can be related to the fluid's properties and the distance from the surface.

What are the key parameters in the Elis-Regita model for non-Newtonian fluids?

The Elis-Regita model includes three key parameters: varvy, V1, and Alfa, which influence the fluid's behavior and determine whether the fluid behaves closer to Newtonian or non-Newtonian characteristics under different conditions.

What happens when the value of varvy is greater than 1 in the Elis-Regita model?

When varvy is greater than 1, the fluid behaves similarly to a Newtonian fluid at low shear rates, meaning its flow properties can be described by simple linear relationships.

What happens when varvy is less than 1 in the Elis-Regita model?

When varvy is less than 1, the fluid behaves more like a non-Newtonian fluid at high shear rates, with more complex flow characteristics that cannot be described by simple Newtonian assumptions.

How does the script explain the process of integrating the fluid flow equations?

The script explains the process of integrating the fluid flow equations to solve for the velocity distribution, using various mathematical steps like substituting known conditions and solving for constants such as C, ultimately leading to a simplified equation for the flow behavior.