A tubular reactor based on the disk and doughnut concept was designed as an engineering solution for biogas upgrading via CO2 methanation. CFD (Computational Fluid Dynamics) benchmarks agreed well with experimental empirical (correlation) data, giving a maximum error of 8.5% 20% chemical reaction heat transfer models, respectively. Likewise, hot spot position accurately predicted, 5% error. The...

the effect of a combined system of the bed suction and jet injection as a pier-scour countermeasure on the turbulent flow field is studied in a laboratory flume using an acoustic doppler velocimeter (adv). the three components of the velocities in the vertical symmetry plane in the equilibrium scour hole in front and rear of the pier under 3-jet injections and bed suction rate qs/q0 = 2%located...

Abstract The present work describes a method for the computation of nucleation rate turbulent spots in transitional boundary layers from particle image velocimetry (PIV) measurements. Different detection functions events recognition were first tested and validated using data direct numerical simulation, this latter flat-plate layer under zero pressure gradient. comparison with previously define...

As is known, the Great Red Spot (GRS) one of most mysterious sights in solar system and a strong storm that quite large. According to laws hydrodynamics gas dynamics, it should have disappeared several centuries ago, but scientists still observe cannot accurately explain this phenomenon. Since turbulence atmospheric waves GRS region absorb energy its winds, vortex loses by radiating heat. In wo...

In the present research, the effects of spot-welding process parameters on the nugget diameter and electrode penetration depth of spot-welded joints were investigated. To achieve this, a spot-welded joint of three-thin sheet low carbon steels (same thicknesses of 0.8 mm) was simulated as an electerical-thermal-mechanical coupling of 3D finite element model. After validating the finite element s...

Abstract: The power and the size of final spot laser beam reaching target are very important requirements in most applications fields such as medical, military, scientific, so studying propagation atmosphere is a topic. through subject to several attenuation processes that deplete expand beam. Through simulation results free electron within visible region electromagnetic spectrum (400-700nm), i...

In this research, the effect of micro turbulence on the flotation rate of quartz particles was investigated. The maximum particle Reynolds number (Rep) was obtained at 60.25 with a particle size of -500+420 µm, impeller speed of 900 rpm, bubble surface area flux of 10.21 1/s and micro scale turbulence size of 162 µm. When the micro turbulence size was equal to the particle size, ...

Fluids and plasmas in a near dissipationless regime commonly exhibit well-defined, coherent structures. We observe these directly in weather patterns, in the zonal jets on Jupiter and the Great Red Spot, in sunspots and magnetic coronal loops, etc. In fact, observations of coherent structures are so widespread that we seldom question why. Such fluids and plasmas are very large order dynamical s...

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In this paper we assessed the possibility of using the pulse rate (PR) extracted from the photoplethysmographic signal for turbulence detection as an alternative to the heart rate (HR). The study is based on analysis of the rhythm changes observed during 4131 ventricular premature beats of 27 subjects. Classical features for turbulence analysis, turbulence onset and turbulence slope were estima...