Self Inhibiting Heat-Flux I. Whistlers Quasilinear Theory

Nonlinear Phenomena Associated with Large Amplitude Whistler Pulses

In a magnetized laboratory plasma (n w 10'' ~ m ~ , kTe 2 1 eV, Bo > 10 G, 1 m diam x 2.5 m) large amplitude current pulses (150 A, 0.2 ps) are excited in the parameter regime described by Electron MHD (EMHD; wci << w << wee). The currents are transported by low-frequency whistlers forming wave packets with topologies resembling 3D spherical vortices. The generalized vorticity, R = V x (v + eA/...

Poloidal rotation driven by nonlinear momentum transport in strong electrostatic turbulence

Virtually, all existing theoretical works on turbulent poloidal momentum transport are based on quasilinear theory. Nonlinear poloidal momentum flux 〈ṽrñṽθ〉 is universally neglected. However, in the strong turbulence regime where relative fluctuation amplitude is no longer small, quasilinear theory is invalid. This is true at the all-important plasma edge. In this work, nonlinear poloidal momen...

CuO/water Nanofluid Convective Heat Transfer Through Square Duct Under Uniform Heat Flux

Sometimes the need for non-circular ducts arises in many heat transfer applications because of lower pressure drop of non-circular cross section such as square duct compared to circular tube, particularly in compact heat. But square cross section has poor heat transfer performance and it is expected that using a nanofluid as a new heat transfer media may improve the heat transfer performance of...

Collisionality dependence of the quasilinear particle flux due to microinstabilities

Direct observation of radiation-belt electron acceleration from electron-volt energies to megavolts by nonlinear whistlers.

The mechanisms for accelerating electrons from thermal to relativistic energies in the terrestrial magnetosphere, on the sun, and in many astrophysical environments have never been verified. We present the first direct observation of two processes that, in a chain, cause this acceleration in Earth's outer radiation belt. The two processes are parallel acceleration from electron-volt to kilovolt...