Related Experiment Videos
Thermal diffusion shock waves
Sorasak Danworaphong1, Walter Craig, Vitalyi Gusev
1Department of Physics, Brown University, Providence, RI 02912, USA.
Physical Review Letters
|March 24, 2005
Summary
The Ludwig-Soret effect, or thermal diffusion, predicts shock waves in liquid mixtures. Experiments confirm these shock waves and their velocities, aligning with nonlinear theory predictions.
Area of Science:
- Physics
- Physical Chemistry
- Fluid Dynamics
Background:
- The Ludwig-Soret effect describes mixture separation under temperature gradients.
- This phenomenon is modeled by a nonlinear partial differential equation.
Purpose of the Study:
- To investigate the nonlinear dynamics of the Ludwig-Soret effect.
- To explore the prediction of shock wave phenomena in thermal diffusion.
Main Methods:
- Solving the nonlinear partial differential equation governing the Ludwig-Soret effect.
- Conducting time-dependent spatial absorption profile measurements.
- Performing self-diffraction experiments on particle suspensions.
Main Results:
- The nonlinear theory predicts shock waves analogous to fluid shocks.
- Shock wave velocities follow relations similar to the Rankine-Hugoniot relations.
- Experimental measurements of particle motion agree with theoretical predictions.
Conclusions:
- Nonlinear theory accurately describes shock wave formation in the Ludwig-Soret effect.
- Experimental validation supports the theoretical framework for thermal diffusion shock waves.