The understanding of flow regimes in helical coils is essential the design and operation modern heat exchangers has been studied therefore intensively over past decades. However, due to subjective nature defining these regimes, previous studies showed conflicting results. scope present study perform automatic regime recognition for two-phase flows by a novel two-step machine learning approach without any prior knowledge. algorithms are trained on X-ray radiography based high-resolution...

Airborne Gamma-Ray Spectrometry (AGRS) is a critical tool for radiological emergency response, enabling the rapid identification and quantification of hazardous terrestrial radionuclides over large areas. However, existing calibration methods are inherently limited to only few gamma-ray sources, excluding most emitting released in severe nuclear accidents weapon detonations, which turn compromise effective response accurate risk assessments such incidents. Here, we present high-fidelity...

Helical coil heat exchangers are known for their superior transfer, compactness and robustness against thermal expansion compared to systems with straight pipes. Due all these benefits, they became quite popular in the last few decades various industries such as pharmaceutical, chemical or nuclear. Generally, used a single-phase environment evaporation taking place on shell side. However, most of steam generator designs adopted advanced nuclear reactors, two-phase mixture flows upward within...

The droplet size distributions in an industrial self-priming Venturi scrubber with liquid film injection have been investigated for varying gas flow rates and different submergence levels. For this purpose, imaging method analysis, commonly applied spray measurements, was adopted validated by means of synthetic data. characterized probability density functions show a unimodal shape can be satisfactorily represented Nukiyama–Tanasawa distribution functions. increase the rate, cumulative...

This monograph presents advancements in Airborne Gamma-Ray Spectrometry (AGRS), a critical tool for emergency response to radiological incidents such as severe nuclear accidents or weapon detonations. Current AGRS calibration and data evaluation methods struggle accurately quantify many radioactive materials expected emergencies, limiting the risk assessment and, hence, effectiveness of actions. To address these limitations, this work introduces full spectrum numerical modeling approach that...

The behavior of two-phase flow and corresponding regimes in helical tubes significantly differ when compared to flows straight due centrifugal torsion effects. In order gain physical insight gather data for validating computational models, a large number experiments were performed on coil experimental setup operated with mixture water air. used assess the predictive capabilities current Computational Fluid Dynamics (CFD) models based Volume (VOF) approach. present paper, comparison CFD...

Abstract. The objective of this work is to simulate the spectral gamma-ray response NaI(Tl) scintillation detectors for airborne spectrometry (AGRS) using state-of-the-art multi-purpose Monte Carlo code FLUKA. study based on a commercial detector system with four individual crystals and total volume 16.8 L. To validate developed model, radiation measurements were conducted 57Co, 60Co, 88Y, 109Cd, 133Ba, 137Cs 152Eu calibration point sources known activities source-detector geometries under...

Scintillator detector response modelling has become an essential tool in various research fields such as particle and nuclear physics, astronomy or geophysics. Yet, due to the system complexity requirement for accurate electron measurements, model inference calibration remains a challenge. Here, we propose Compton edge probing perform non-proportional scintillation (NPSM) inorganic scintillators. We use laboratory-based gamma-ray radiation measurements with NaI(Tl) scintillator Bayesian on...

The objective of the present study is to simulate spectral gamma-ray response Swiss Airborne Gamma-Ray Spectrometry system (SAGRS) using Monte Carlo radiation transport codes. SAGRS mounted in cargo bay a AS-332M1 Super Puma helicopter from Air Force and consists four prismatic NaI(Tl) scintillation crystals with total volume 16.8 l. We developed high-fidelity model including detector multi-purpose code FLUKA. As part measurement campaign ARM22c organized by National Emergency Operations...

The objective of this work is to derive high-resolution spectral and angular detector response matrices NaI(Tl) scintillation detectors for airborne gamma-ray spectrometry (AGRS) applications using a simulation-based numerical approach.The coupled electron was simulated the high-fidelity multi-purpose Monte Carlo code FLUKA in an event-by-event mode adopting high-performance computing. simulation model incorporates state-of-the-art non-proportional model. To validate developed model,...

<p>The objective of this work is to simulate the spectral gamma-ray response NaI(Tl) scintillation detectors for airborne spectrometry (AGRS) using Monte Carlo radiation transport codes. The study based on a commercial detector system with four individual crystals and total volume 16.8 l. source-detector simulations were performed in an event-by-event mode multi-purpose codes MCNP6.2 FLUKA. Validation measurements conducted <sup>241</sup>Am,...