Drift wave test particle transport in reversed shear profile

Drift wave test particle transport in reversed shear profile

Drift wave maps, area preserving maps that describe the motion of charged particles in drift waves, are derived. The maps allow the integration of particle orbits on the long time scale needed to describe transport. Calculations using the drift wave maps show that dramatic improvement in the particle confinement, in the presence of a given level and spectrum of E3B turbulence, can occur for q(r...

Numerical Simulation of Particle Transport in a Drift Ratchet

The directed transport of micro-particles depending on their size is the basis for particle sorting methods that are of utmost importance in life sciences, e.g. A drift ratchet is a Brownian motor that allows for such a directed transport. Hereby, the particle motion is induced by a combination of the Brownian motion and asymmetries stemming for example from the domain’s geometry, electrical fi...

Extremal Bounds on Drift Wave Growth Rates and Transport

Capillary–gravity wave transport over spatially random drift

We derive transport equations for the propagation of water wave action in the presence of subsurface random flows. Using the Wigner distribution W(x, k, t) to represent the envelope of the wave amplitude at position x, time t contained in high frequency waves with wave vector k/ε (where ε is a small parameter compared to a characteristic distance of propagation), we describe surface wave transp...

Transport of parallel momentum by collisionless drift wave turbulence

This paper presents a novel, unified approach to the theory of turbulent transport of parallel momentum by collisionless drift waves. The physics of resonant and nonresonant off-diagonal contributions to the momentum flux is emphasized, and collisionless momentum exchange between waves and particles is accounted for. Two related momentum conservation theorems are derived. These relate the reson...