CFD investigations of steam penetration, air-removal and condensation inside hollow loads and cavities

Feurhuber, Manuel; Magno, Marino; Miranda, Marco; Hochenauer, Christoph

doi:10.1016/j.applthermaleng.2018.10.135

Cited by 14 publications

(4 citation statements)

References 25 publications

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“…A single measurement is insufficient to predict the real concentration of NCGs present in the steam, requiring more than one collection to estimate the actual amount of NCGs. Currently, other methodologies are being proposed to obtain more precise values, such as Computational Fluids Dynamics (CFD) studies [12][13][14] or even applying mathematical models based on temperature and pressure measurements inside the sterilizers. In this study, the data collection is connected to the steam supply pipe for the sterilizers, making it difficult to insert temperature and pressure sensors to apply such methods.…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have been developed to evaluate the effect of the NCGs in the steam generation. Feurhuber et al, 2019 [ 12 ], developed a computational fluid dynamics (CFD) model to simulate the fluid flow, temperature, heat transfer, and steam penetration inside the steam sterilizer. The CFD model developed was able to predict the volume fraction of NCGs, as well as steam penetration inside the steam sterilizer, including the hollow loads.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of water quality over non-condensable gases concentration on steam used for sterilization

Miguel¹,

Laranjeira²,

Ishii

et al. 2022

PLoS ONE

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Background Non-condensable gases (NCGs) are all gases that do not undergo liquefaction during the saturated steam sterilization process. During a sterilization cycle, the NCGs presence inside the chamber is one of the biggest threats to the sterilization process compromising process validation and product quality. Methods In this work, 170 testing of NCGs concentrations performed between September 2016 and August 2021 were carried out by Orionce Serviços de Metrologia Ltda (Barueri, SP, Brazil), according to EN285:2015 procedure. For steam generation, the types of water used were softened water (SW), one-step reverse osmosis (RO), purified water (PW), and water for injection (WFI). The data obtained were analyzed using Minitab® software, version 18.1, to identify a relationship between the water quality used for steam generation and the concentration of non-condensable gases determined into equipment qualification. Findings From total tests performed, 109 tests passed, and 61 tests failed, representing 64.2% and 35.8%, respectively. A higher failure rate was observed in terms of concentration of non-condensable gases in systems that used purified water for steam generation (64.7%), followed by softened water (55.6%), one-step reverse osmosis (42.9%), and water for injection (7.6%). Conclusion System processes using WFI for steam generation showed better results for steam quality approvement, in terms of NCGs concentration, compared to softened, purified, or reverse osmosis water treatments in the concentration of non-condensable gases in steam used for sterilization processes of industrial utilities.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of water quality over non-condensable gases concentration on steam used for sterilization

Miguel¹,

Laranjeira²,

Ishii

et al. 2022

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…The results indicated that the simulated temperatures are in very good accordance with the measured data. The CFD approach is applied to develop all of the phenomena that occur inside the steam sterilizer, and particularly inside the hollow load PCD tests [22]. Ref.…”

Section: Methodsmentioning

confidence: 99%

Numerical Computation of Hydrodynamic Characteristics of an Automated Hand-Washing System

Le,

Vuong,

Phung

2023

Computation

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The aim of this study is to develop a physical model and investigate the bactericidal effect of an automated hand-washing system through numerical computation, which is essential in areas affected by COVID-19 to ensure safety and limit the spread of the pandemic. The computational fluid dynamics approach is used to study the movement of the solution inside the hand-washing chamber. The finite element method with the k-ε model is applied to solve the incompressible Navier–Stokes equations. The numerical results provide insights into the solution’s hydrodynamic values, streamlines, and density in the two cases of with a hand and without a hand. The pressure and mean velocity of the fluid in the hand-washing chamber increases when the inlet flow rates increase. When the hand-washing chamber operates, it creates whirlpools around the hands, which remove bacteria. In addition, the liquid inlet flow affects the pressure in the hand-washing chamber. The ability to predict the hydraulic and cleaning performance efficiencies of the hand-washing chamber is crucial for evaluating its operability and improving its design in the future.

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“…Recently, a numerical calculation has become an important means to solve condensation problems, as it can provide more detailed data compared with experimental methods (e.g., Hammoudi et al, 2018;Feurhuber et al, 2019;Zhang et al, 2019;Kleiner et al, 2020). In the simulation of the condensation process, a key issue is how to implement mass transfer between two phases, which is the phase change method.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on film condensation of steam with non-condensable gas on a vertical plate

Wei

Wang³

2023

Front. Energy Res.

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The film condensation of steam is very common in several industrial areas, such as condensers in power plants, seawater desalination, and air-conditioning systems. In some studies, the non-condensable gas and liquid film are overlooked for the sake of simplicity. To provide an integral computational scheme, in the present study, the film condensation of steam in the presence of non-condensable gas on a vertical plate has been simulated using a two-dimensional CFD model combining a wall condensation model and volume of fluid (VOF) model. After verification, the proposed computational scheme is used to simulate the steam condensation process, with the mass fractions of non-condensable gas varying from 5% to 45%. The results indicate that the concentration of non-condensable gas in the boundary layer decreases gradually with the condensation process, resulting in a decline in the synergy between temperature and velocity field. It can also be found that the fluctuation of the liquid film can influence the concentration distribution of the non-condensable gas layer. For cases with high concentrations of steam, the thermal resistance of liquid film can reach more than 20% of the total thermal resistance, which should not be ignored.

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CFD investigations of steam penetration, air-removal and condensation inside hollow loads and cavities

Cited by 14 publications

References 25 publications

Analysis of water quality over non-condensable gases concentration on steam used for sterilization

Analysis of water quality over non-condensable gases concentration on steam used for sterilization

Numerical Computation of Hydrodynamic Characteristics of an Automated Hand-Washing System

A numerical study on film condensation of steam with non-condensable gas on a vertical plate

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