This paper presents capability of Eulerian CFD (Computational Fluid Dynamics) approach using sensitivity-analysis-based model to predict subcooled boiling flows in the DEBORA experiment, conditions corresponding those PWRs (Pressurized Water Reactors). The main feature developed is a good estimation void fraction distribution cross section heated pipe, not only lower regime but also high (>0.5)...

We investigate the phenomenon of electron–positron pair production in intense external backgrounds within strong-field regime. perform nonperturbative calculations by solving quantum kinetic equations, and obtain momentum distributions particles created total number pairs. In particular, we analyze validity locally constant field approximation (LCFA), which represents a powerful method for trea...

Formation of a dispersed oil—water flow pattern is common occurrence in lines and pipelines. The capability predicting the size droplets, as well distribution phase volume fraction utmost importance for proper design such systems. present study aims at modelling water oil flows horizontal pipe by employing multi-fluid Eulerian approach along with population balance model. To this end, momentum ...

The segregation process of a single large intruder in vibrated bed small particles has been widely studied, but most previous studies focused on spherical intruders. In this work, the discrete element method was used to study effects vibration conditions and shape dimensionless ascending velocity (va) intruder. prolate with aspect ratio varied its equivalent diameter fixed. Three diameters, nam...

The application of direct injection (DI) technology can effectively improve the atomization effect heavy fuel to reduce loss engines (HFE). spray characteristics directly affect combustion performance engine. To investigate process and evaporation in-cylinder for an air-assisted (AADI) engine, a simulation calculation model AADI HFE was established with use computational fluid dynamics tool. in...

The article discusses the results of experimental studies on course pyrolysis oil injection through high-pressure injector a direct-injection engine. used for tests was derived from waste plastics (mainly high-density polyethylene—HDPE). This then distilled. also describes production technology this laboratory scale. It presents chemical composition raw and after distillation process using GC-M...

High-frequency wave propagation has many important applications in acoustics, elastodynamics, and electromagnetics. Unfortunately, the finite element discretization for these problems suffers from significant numerical pollution errors that increase with wavenumber. It is critical to control obtain a stable accurate method. We study effect of very long waveguide context robust discontinuous Pet...

Raw water clarification by flotation was studied by injecting air into a centrifugal multiphase pump to generate microbubbles (MBs) and nanobubbles (NBs). Measurements of gas dispersion parameters were performed and optimal conditions were obtained using a pump pressure of 4 bar. Values showed a bubble Sauter diameter of 75 μm, an air holdup of 1.2%, a bubble surface area flux of 34 s-1 and an ...

The hydrodynamic effects on spectroscopic water detection were microscopically investigated in a gasoline pipe flow. The effects of the gasoline flow rate and the water content on the water droplet characteristics were investigated experimentally using a phase Doppler particle measurement system. The characteristics of spectral absorbance of water and gasoline were measured using a spectrophoto...

The objective of this work is to study the effect of the rapeseed oil content on the physical properties of whey protein emulsion films. For this purpose, whey protein films with the addition of 0, 1, 2 and 3% of rapeseed oil, and glycerol as a plasticizer were obtained by the casting method. Film-forming emulsions were evaluated and compared using light scattering granulometry. The Sauter mean...