Compact Riemannian solar twisted magnetic flux tube surfaces model are tested against solar extreme ultraviolet (EUV) lines observations, allowing us to compute the diameter and height of solar plasma loops. The relation between magnetic and torsion energies is found for a nonplanar solar twisted (torsioned) loop to be 10, which shows that the contribution of torsion energy to the solar loop is...

In this paper, a transcritical carbon dioxide power generation system based on vortex tube is studied, which has the advantage of self-condensation dioxide. The thermodynamic performance was investigated by establishing mathematical model. results showed that under fundamental working conditions, could output net 271.72 kW, and thermal efficiency as well exergy reach 7.38% 27.09%, respectively....

Discrete Element Model (DEM) is used to simulate bubble and particle interactions with vortical flows. In this Euler-Lagrange approach, volume-averaged Navier-Stokes equations are solved using a co-located grid finite volume method. The dispersed phase is assumed spherical and is modeled by tracking the centroids of the particles/bubbles in a Lagrangian frame. In addition to interphase momentum...

In the present study, numerical investigations of a Francis turbine at model scale are performed. A part load operating point is selected for the analysis with a focus on the cavitating draft tube vortex rope. For three σ-levels, different aspects are investigated. First, the extension of the vapor volume is analyzed and compared to high-speed visualization recordings from the measurements. Fur...

We investigate the approximation of the Monge problem (minimizing ∫ Ω |T (x)− x|dμ(x) among the vector-valued maps T with prescribed image measure T#μ) by adding a vanishing Dirichlet energy, namely ε ∫ Ω |DT |. We study the Γ-convergence as ε → 0, proving a density result for Sobolev (or Lipschitz) transport maps in the class of transport plans. In a certain two-dimensional framework that we a...

Using theoretical and computational methods we obtain these findings: 1) In micro-confined high-pressure transcritical turbulence, higher than typical levels of vorticity are observed in the viscous sublayer; 2) Flow topologies from far-wall regions vicinity supercritical gas-like wall; 3) Tube-like flow motions favored at scales comparable to density-gradient scale, resulting a smaller number ...

This paper examines the numerical work of thermal convection over tube banks with winglets through heat exchanger in two parts under turbulent conditions. The first section investigates influence two-phase (water and air) flow on performance kinds vortex generators (Delta Rectangular) across oval banks. second studied four types (Delta, Rectangular, Zikzak, Sinusoidal wavy), circular tubes, for...

Ide dasar yang melandasi penelitian ini adalah pemanfaatan gas buang engine pesawat digunakan untuk sistem anti icing, sehingga di dapatkan sebuah mekanisme operasional efektif mengatasi icing terjadi pada karburator piston engine. Sistem dibuat meliputi shell dan tube diberikan vortex generator berupa buffle dimodifikasi, adapun variasi dari yaitu line buffle, with circular hole, square hole. ...

We consider an electron with an anomalous magnetic momentum, g > 2 , confined to a plane and interacting with a nonhomogeneous magnetic field B . We show that if B is of a compact support and the related flux is N + ǫ , ǫ ∈ (0, 1] , the corresponding Pauli Hamiltonian has at least N + 1 bound states. We also consider the situation where B is due to a localized rotationally symmetric electric cu...