NEPTUNE_CFD is a code based on a 3D transient Eulerian two-fluid model. One of the main application targets is the two-phase Pressurized Thermal Shock (PTS), which is related to PWR Reactor Pressure Vessel (RPV) lifetime safety studies, when sub-cooled water from Emergency Core Cooling (ECC) system is injected into the possibly uncovered cold leg and penetrates into the RPV downcomer. Five expe...

An optical interface has been designed to maximise the sensitivity and spatial resolution required when Raman spectrometry is used to monitor a reaction in a micro-reactor, revealing advantages over a conventional commercial probe. A miniature aspheric lens was shown to be better than microscope objectives to focus the probing laser beam onto the sample. The diameters of the exciting and collec...

Understanding the gas phase decomposition kinetics of the chemical precursors involved in the nucleation and thin-film growth processes is crucial for controlling the surface kinetics and the growth process. The growth of emerging materials such as InN and related alloys requires deposition methods operating at elevated vapor densities due to the high thermal decomposition pressure of these mat...

In this paper, an Unprotected Loss of Flow (ULOF) assessment has been performed on the European Sodium Fast Reactor developed in ESFR-SMART EU project. To conduct analysis, a simplified 42 channel thermal–hydraulic model established TRACE system code, using point kinetics accounting for various reactivity feedback effects. The reveals core behavior commercial size, 3600 MWth, sodium fast reacto...

The present work describes a reactor that allows in situ measurements of spatially resolved kinetic data in heterogeneous catalysis. The reactor design allows measurements up to temperatures of 1300 degrees C and 45 bar pressure, i.e., conditions of industrial relevance. The reactor involves reactants flowing through a solid catalyst bed containing a sampling capillary with a side sampling orif...

Pulsed arc electrohydraulic discharge (PAED) offers concurrent treatment of chemical and microbial target compounds in water by several mechanisms. Here, Escherichia coli, Bacillus subtilis spore, and MS2 bacteriophage inactivation by PAED were investigated using two bench-scale reactors (0.7 and 3 L). A plasma channel was created between a pair of iron electrodes set 0.5 mm apart in these reac...

We developed a two-layer, four-channel polymerase chain reaction (PCR)-capillary electrophoresis microdevice that integrates nucleic acid amplification, sample cleanup and concentration, capillary electrophoretic separation, and detection for multiplex analysis of four human respiratory viral pathogens, influenza A, influenza B, coronavirus OC43, and human metapneumovirus. Biotinylated and fluo...

The hydrodynamics of a three-phase micro-packed bed reactor and its effect on catalysed benzyl alcohol oxidation with pure oxygen were studied in a silicon–glass microstructured reactor. The microreactor was operated at 120 °C and 1 barg and contained a channel with a 300 μm 600 μm cross-section, packed with 1 wt% Au–Pd/TiO2 catalyst, 65 μm in average diameter. Improvements in the conversion of...

The Xi’an Pulsed Reactor (XAPR) is characterized by its small core size and integrated fuel moderator structure, which results in a non-uniform power temperature distribution. Consequently, complex coupling relationship exists between neutronics thermal hydraulics, necessitating the assurance for operational safety of XAPR. To optimize experimental scheme reactor, refined three-dimensional stea...

the steps taken in designing a loop reactor for bulk propylene polymerization are discussed. the roles played by several parameters like particle growth factor, catalyst activity and solid fraction on reactor volume at different operating conditions are investigated. at first, based on a fixed production capacity and specific rate of catalyst, reactor volume is determined. next, the length and ...