This paper is concerned with the development of a control system for tracking of a desired temperaturetime profile for accelerated cooling processes in hot rolling of steel. Control of temperature during cooling is essential for achieving desired mechanical and metallurgical properties of steel. The cooling process is represented by the heat equation in Lagrangian coordinates which is approxima...

This study concerns the determination of the significant factors for an innovative deburring process: low pressure abrasive water-jet blasting. We firstly classify the abrasive medium aluminum oxide (Al2O3) according to the individual characteristics of different grain sizes. Then, the particle behavior in the air jet is analyzed with an optical measuring method, Particle Image Velocimetry (PIV...

We are studying experimentally the behavior of jets in flute-like instruments. At the time being most models for jet oscillations are based on linear jet instability analysis described by Rayleigh. But there is no clear model for the initial perturbations induced by transverse acoustic velocity. Aiming to understand and describe the origin of the perturbation, we are currently investigating the...

Multiwaveband images of extended jets in quasars reveal that in some locations electrons reach energies of at least 100 TeV, while in others the particle acceleration is less efficient. The jet of the quasar 1317+520 (z=1.06) contains shocks that are both transverse and oblique to the jet axis as well as regions where the axial magnetic field and polarization indicate cross-jet velocity shear. ...

The Serpens (“triple source”) radio continuum jet shows a series of aligned knots with ≈ 1-2′′ angular separations, forming a curved structure circumscribed within a cone of∼ 10◦ full opening angle. We present a high resolution, 3D numerical simulation of a jet with variable ejection direction and velocity with parameters appropriate for the Serpens jet, from which we obtain predictions of 3.6 ...

The double-peak structure observed in soft-hard hadron correlations is commonly interpreted as a signature for a Mach cone generated by a supersonic jet interacting with the hot and dense medium created in ultrarelativistic heavy-ion collisions. We show that it can also arise due to averaging over many jet events in a transversally expanding background. We find that the jet-induced away-side yi...

Wall-jet flow is an important flow field in hydraulic engineering, and its applications include flow from the bottom outlet of dams and sluice gates. In this paper, the plane turbulent wall jet in shallow tailwater is simulated by solving the Reynolds Averaged Navier-Stokes equations using the standard  turbulence closure model. This study aims to explore the ability of a time splitting method ...

We have mapped the protostellar jet HH 211 in 342 GHz continuum, SiO (J = 8− 7), and CO (J = 3− 2) emission at ∼ 1 resolution with the Submillimeter Array (SMA). Thermal dust emission is seen in continuum at the center of the jet, tracing an envelope and a possible optically thick compact disk (with a size < 130 AU) around the protostar. A knotty jet is seen in CO and SiO as in H2, but extendin...

We present results on the compact steep-spectrum quasar 3C 48 from observations with the Very Long Baseline Array (VLBA), the Multi-Element Radio Linked Interferometer Network (MERLIN) and the European Very long baseline interferometry (VLBI) Network (EVN) at multiple radio frequencies. In the 1.5-GHz VLBI images, the radio jet is characterized by a series of bright knots. The active nucleus is...

When a heat exchanger in a Fast Breeder Reactor cracks, highly pressurized water or steam escapes into the surrounding liquid sodium. A sodium-water reaction then occurs, forming disodium oxide (and hydrogen gas). It can cause secondary damages to the heat exchangers by the reaction heat and erosion corrosion. The released flow of steam from the cracks of the heat exchanger is an underexpanded ...