Water jet technology is an effective measure by which to improve the efficiency of deep coalbed methane mining. Nevertheless, effect a water impinging on coal rock remains unclear. In this study, numerical simulation used analyze impingement drill test block, after experimental verification carried out. Next, basis that method feasible, influence factors in hole are analyzed. It concluded phase...

ABSTRACT We perform 3D general-relativistic magnetohydrodynamic simulations to model the jet break-out from ejecta expected be produced in a binary neutron-star merger. The structure of relativistic outflow simulation confirms our previous results 2D simulations, namely, that magnetized breaking out merger exhibits hollow core ?core ? 4°, an opening angle ?jet ? 10°, and is accompanied by wind ...

ahmad matar – iraqi satirical poet – attempted to save the arabic governments from imperialistic yoke who tried to arrogate nations’ freedom. his poetic language has sensible characteristics which the poet applies them in order to invite people to freedom and liberty. norm breaking is one of his poetry’s features. the present article tries to survey the vocal norm breaking – including rhyme, rh...

Sparticle mass hierarchies will play an important role in the type of signatures that will be visible at the Large Hadron Collider. We analyze these hierarchies for the four lightest sparticles for a general class of supergravity unified models including nonuniversalities in the soft breaking sector. It is shown that out of nearly 104 possibilities of sparticle mass hierarchies, only a small nu...

Abstract In this paper, a Taylor cone model in the nanoscale is configured using many-body dissipative particle dynamics method. The sharpening process of and breakup at different electric field intensities charge concentrations are systematically investigated. Under strong field, hemispherical droplet sharpened over time evolves into conic one. Then cusp emits thin jet. Finally, shrinks semi-s...

the study of interactions of jet into cross flow at different longitudinal and transverse angles ofjet was studied. the following components were designed and constructed: a low velocity windtunnel to produce the uniform flow, a flat plate with a traverse injection system to simulate the jetinjection, and a spatial rake to measure the total pressure. the tests were carried out atlongitudinal (α...

designing and manufacturing the multiple jets simulator and experimental investigation of the multiple jets in crossflow at low velocity ratios have been studied together with design and build a low-speed wind tunnel. a specific rake is used to determine the flow field pressure and changes in static pressure measured by pressure taps in the near field of the jets. there are generally three regi...

In this paper, we present extensions, extensive validations and applications of our previously published hybrid volume-of-fluid-based (VOF)model for the simulation of freesurface flow problems. For the solution of the flow field, the lattice Boltzmann method is used, where the free surface is represented by a VOF approach. The advection equation for the VOF fill level is discretized with a fini...

crust breaking of saffron is an important operation at the first stage of growth that should be accuratly operated as in this period sprouts of saffron rise up to near the soil surface. after primary irrigation, farmers soften the soil surface by means of different cultivation implements, which enables saffron flowers arise from subsurfarce. this research was conducted to compare tillage implem...