Related Experiment Video
Updated: Jun 8, 2026
11:51
Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
Motif distributions in phase-space networks for characterizing experimental two-phase flow patterns with chaotic
Zhong-Ke Gao1, Ning-De Jin, Wen-Xu Wang
1School of Electrical Engineering and Automation, Tianjin University, Tianjin, China.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 28, 2010
Summary
This study uses network motifs to analyze complex two-phase flow patterns. The findings suggest these flows exhibit chaotic dynamics, offering a new method for understanding fluid mechanics.
Area of Science:
- Fluid Mechanics
- Nonlinear Dynamics
- Network Science
Background:
- Two-phase flow dynamics present significant challenges in nonlinear dynamics and fluid mechanics.
- Characterizing and distinguishing flow patterns is crucial for understanding complex fluid behavior.
Purpose of the Study:
- To propose a novel method for characterizing two-phase flow patterns using network motifs.
- To investigate the underlying dynamics of inclined water-oil flow experiments.
Main Methods:
- Constructing phase-space complex networks from experimental time series data.
- Calculating the distribution of distinct network motifs.
- Testing the approach with classical chaotic systems.
- Computing the maximal Lyapunov exponent.
Main Results:
- Network motif distributions from chaotic systems are highly heterogeneous.
- Experimental two-phase flow patterns also exhibit heterogeneous motif distributions.
- These findings suggest an underlying chaotic nature in the fluid dynamics.
Conclusions:
- Network motif analysis provides a feasible tool for understanding the dynamics of realistic two-phase flow patterns.
- The heterogeneity in motif distributions indicates chaotic behavior in fluid flows.
- This approach offers new insights into complex fluid dynamics.
More Related Videos
Related Concept Videos
01:23Plane Potential Flows
Plane potential flows simplify fluid motion by assuming the fluid to be irrotational and incompressible. These characteristics allow these flows to be described by a velocity potential function, ϕ, representing the flow speed in a given direction, and a stream function, ψ, that visualizes the flow path, both governed by Laplace's equation. These parameters help in estimating flow patterns, velocity distributions, and pressure fields around various hydraulic structures.
Uniform Flow
Uniform flow...
Uniform Flow
Uniform flow...
01:24Turbulent Flow
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 spots,...
01:23Introduction to Types of Flows
Fluid flows are categorized by dimensionality and behavior, with one-dimensional flow being the simplest form, where properties like velocity and pressure change only along a single axis. Water moving through straight pipes exemplifies this flow type, as variations in other directions are minimal. One-dimensional analysis helps simplify understanding such flows, focusing solely on changes along the pipe's length.
Two-dimensional flow involves changes in both length and height, as seen in air...
Two-dimensional flow involves changes in both length and height, as seen in air...
01:07Laminar and Turbulent Flow
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 streamlines...
01:24Rapidly Varying Flow
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
01:18Streamlines, Streaklines, and Pathlines
A streamline represents the trajectory that is always tangent to the fluid's velocity vector at any given point. The velocity of a fluid particle is always directed along the streamline, ensuring the particle continuously follows the streamline's path. Streamlines are particularly useful for visualizing the overall direction of flow in a fluid system, and they provide an instantaneous representation of the flow's velocity field. In steady flow, where conditions do not change over time,...