Related Experiment Video
Updated: Jul 12, 2025

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
Observation of Traveling Breathers and Their Scattering in a Two-Fluid System
Yifeng Mao1, Sathyanarayanan Chandramouli2, Wenqian Xu1
1Department of Applied Mathematics, University of Colorado, Boulder, Colorado 80309, USA.
Abstract:
The observation of traveling breathers (TBs) with large-amplitude oscillatory tails realizes an almost 50-year-old theoretical prediction [E. A. Kuznetsov and A. V. Mikhailov, Stability of stationary waves in nonlinear weakly dispersive media, Zh. Eksp. Teor. Fiz. 67, 1717 (1974) ZETFA70044-4510[E. A. Kuznetsov and A. V. MikhailovSov. Phys. JETP 40, 855 (1975)] SPHJAR0038-5646] and generalizes the notion of a breather. Two strongly nonlinear TB families are created in a core-annular flow by interacting a soliton and a nonlinear periodic (cnoidal) carrier. Bright and dark TBs are observed to move faster or slower, respectively, than the carrier while imparting a phase shift. Agreement with model equations is achieved. Scattering of the TBs is observed to be physically elastic. The observed TBs generalize to many continuum and discrete systems.
Related Concept Videos
Physical Principles Governing Gas Exchange
Gas Laws Governing Respiration
The behavior of gases is guided by Dalton's Law of partial pressures and Henry's Law.
Dalton's Law asserts that the total...
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion
Couette Flow
Bernoulli's Principle: Applications
Entrainment devices use a high fluid speed to create low pressures and, thus, entrain one fluid into another. Some examples of these devices are given below:
Boundary Layer Characteristics
Bernoulli's Equation

