Investigation of the regularities of particle motion in a vortex air flow of radius variable in height

Annotation Purpose. Improving the mathematical description of the motion of a solid particle in a vortex air flow for the case of changing the radius of twisting of the flow in the main direction. Methods. The specificity of the question under consideration determines the analytical method of research based on the compilation and analysis of the equations of motion of the particle, in the form of a sphere in the vortex air flow of a conical channel with uneven distribution of air flow velocity over height. Results. The motion of a solid particle in the air in the middle of a conical air-permeable surface is considered; air is sucked through the lateral surface of the cone with louver slits (holes) in the tangential direction, under the action of artificially created forces of the vortex air flow there is an effective intensification of grain fractionation. The obtained equation of particle motion under the action of vortex air flow allows to determine the dependence of material velocity in the grain material layer on a number of factors: geometric parameters of the separator, material feed angle, initial kinematic mode of the material and particle vitality coefficient. Conclusions. Based on the analysis of the force interaction of a particle of grain material with a vortex air flow, an improved mathematical model of particle motion in a non-uniform field of air flow velocity in a conical channel is obtained. Keywords: variable air velocity, trajectory, stability of forces, fractions, vortex air flow, fractionation process, grain mixture.

Asymmetric transport of water molecules through a hydrophobic conical channel

Unlike macroscale systems, symmetry breaking could lead to surprising results for nanoscale systems.

Study of Micro Hydropower Plant Operating in Gravitational Vortex Flow Mode

This paper refers to experimental study of a new type of micro hydropower plant for energy conversion of low river water heads into mechanical work by imposing gravitational vortex flow in spiral form through a vertical conical channel. In this vortex, at different heights of the conical channel, are positioned rotor blades of the turbine with different values of specific speed. The characteristics of the gravitational vortex of water flow through the conical channel, the speed and the power characteristics of the micro hydropower plant were investigated and attempts to efficiency modeling were performed.

Focusing of intense laser pulse by a hollow cone

It is shown that an intense laser pulse can be focused by a conical channel. This anomalous light focusing can be attributed to a hitherto ignored effect in nonlinear optics, namely that the boundary response depends on the light intensity: the inner cone surface is ionized and the laser pulse is in turn modified by the resulting boundary plasma. The interaction creates a new self-consistently evolving light-plasma boundary, which greatly reduces reflection and enhances forward propagation of the light pulse. The hollow cone can thus be used for attaining extremely high light intensities for applications in strong-field and high energy-density physics and other areas.