Related Experiment Video
Updated: Jan 29, 2026
08:10
Author Spotlight: Enhancing Lipid Nanoparticle Formation Through Turbulent Mixing in Confined Geometries
Published on: August 23, 2024
6.0K
Elastic Turbulence of Aqueous Polymer Solution in Multi-Stream Micro-Channel Flow
1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. JYTai@e.ntu.edu.sg.
Micromachines
|February 10, 2019
Summary
Elastic turbulence in micro-channels, driven by polymer solutions, was studied in a multi-stream flow. The flow showed similarities to inertia-driven turbulence, with novel power-law spectra observed.
Area of Science:
- Fluid Dynamics
- Rheology
- Microfluidics
Background:
- Micro-channel flows are typically laminar due to low Reynolds numbers.
- Introducing polymer elasticity can induce turbulent flow, known as elastic turbulence.
- Existing studies primarily focus on single-stream elastic turbulent flows.
Purpose of the Study:
- To investigate the characteristics of elastic turbulence in a multi-stream micro-channel flow.
- To provide a comprehensive statistical analysis of elastic turbulence in a 3-stream contraction-expansion micro-channel.
- To compare elastic turbulence with inertia-driven turbulence.
Main Methods:
- Direct visualization of polymer molecule extension and relaxation.
- Statistical analysis of flow field characteristics.
- Application of flow visualization tools.
Main Results:
- The flow field in the 3-stream micro-channel exhibited similarities to inertia-driven turbulence.
- Observed two distinct power-law dependencies in velocity power spectra at high frequencies.
- Identified characteristics typical of two-dimensional turbulence in elastic turbulent micro-channel flow.
Conclusions:
- Multi-stream elastic turbulence in micro-channels shares features with inertia-driven turbulence.
- The study reports novel observations of two-dimensional turbulence characteristics in elastic turbulent flows.
- This research advances the understanding of elastic flow instabilities in complex microfluidic systems.
Related Concept Videos
03:03Chemical Reactions in Aqueous Solutions
72.3K
Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
72.3K
02:42Aqueous Solutions and Heats of Hydration
17.9K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
17.9K
01:24Turbulent Flow
718
Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
718
01:07Laminar and Turbulent Flow
11.1K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
11.1K
01:09Turbulent Flow: Problem Solving
407
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures enhance...
407
02:11Leveling Effect and Non-Aqueous Acid-Base Solutions
9.4K
This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
9.4K