Experiment and simulation research of evolution process for LNG leakage and diffusion

Zhu, Guorui; Guo, Xiyan; Yan, Yinfei; Tan, Wei; Ji, Chunhui

doi:10.1016/j.jlp.2019.104041

Cited by 26 publications

(4 citation statements)

References 8 publications

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“…2. The velocity distribution and gas cloud distribution of CO 2 are consistent with previous studies assessing the diffusion of heavy gas 29 . In conclusion, the simulation results and analysis are accurate and reliable.…”

Section: Resultssupporting

confidence: 88%

Simulation analysis and freshness prediction of eggs laid at room temperature

Wang

Curi

et al. 2022

J Sci Food Agric

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BACKGROUND: Respiration is an important physiological activity of eggs and is closely related to their freshness. To further observe the diffusion of carbon dioxide released by egg respiration, we used a respirometer to measure the respiration parameters of eggs stored at room temperature and performed a respiration simulation using Fluent software. This paper also explores the relationship between respiratory intensity, freshness, and storage period. RESULTS:The results demonstrate that the diffusion of carbon dioxide released from the respiration of eggs is related to the characteristics of heavy gas diffusion. By comparison, the simulated value (0.0199 m s −1 ) is close to the experimental value (0.0208 m s −1 ), which indicates that the simulation and analysis results are valid. In addition, the logarithmic model was used to assess the relationship between respiration intensity, Haugh unit, and the yolk index (R 2 values 0.89 and 0.87). The R 2 of the relationship between the real and the predicted Haugh unit value and the yolk index are 0.9 and 0.84 respectively, indicating that the model is a good fit. The equivalent egg age model was established using nonlinear regression, where the correlation coefficient R was 0.888 and P < 0.01, indicating it was both stable and reliable.CONCLUSION: The standard k-ε model is suitable for egg respiration simulation analysis. Respiratory intensity can be used as a potential index for nondestructive testing of egg freshness, which is a new method for nondestructive testing of egg freshness and storage period.

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Section: Resultssupporting

confidence: 88%

Simulation analysis and freshness prediction of eggs laid at room temperature

Wang

Curi

et al. 2022

J Sci Food Agric

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“…The mass flow rate of an ongoing leakage source resulting from a bunkering hose failure can be determined by [63,64]:…”

Section: Mathematical Modelsmentioning

confidence: 99%

The Effect of Ventilation on the Hazards of Hydrogen Release in Enclosed Areas of Hydrogen-Fueled Ship

Ryu,

Duong,

Kim

et al. 2023

JMSE

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This paper presents a systematic investigation that encompasses the safety assessment of a fuel preparation room (FPR) intended for a hydrogen-fueled ship. The primary objective is to determine the appropriate ventilation strategy to mitigate the risks associated with potential hydrogen leakage. The study focuses on a case involving an FPR measuring 10.2 m × 5.3 m × 2.65 m, which is part of a 750 DWT hydrogen-powered fishing vessel. To identify the potential events leading to hydrogen dispersion, an event tree analysis is conducted. Additionally, existing regulations and guidelines related to the safety assessments of hydrogen leakage in enclosed areas are summarized and analyzed. Computational fluid dynamics, FLACS-CFD, are utilized for the consequence analysis in order to evaluate the impact of ventilation on hydrogen dispersion and concentration within the FPR. The research findings indicate significant effects of ventilation on the hazards and safety assessments of FPRs and high-pressure fuel gas supply systems. The study highlights that hydrogen vapor tends to accumulate at the ceiling and in the corners and spaces created by the equipment. The position and size of ventilation openings greatly influence the dispersion of hydrogen leakage. Proper ventilation design, including top inlet ventilation and outlet ventilation on the opposite side, helps to maintain a safe FPR by facilitating the efficient dispersion of hydrogen vapor. Moreover, locating inlet ventilation on the same side as the outlet ventilation is found to hinder dispersion, while the cross-ventilation achieved by placing inlets and outlets on opposite sides enhances airflow and dispersion. Consequently, it is recommended to prioritize the structural design of FPRs and implement enhanced safety measures. Additionally, updating the relevant regulations to address these concerns is strongly advised.

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“…Its research mainly involves experimental studies and the in uence of different in uencing factors on the diffusion of leaks. (Zhu et al, 2020) combined experiments and simulations to simulate the transient process of LNG leakage and dispersion, and obtained the LNG leakage dispersion concentration law. (Lin et al, 2019) investigated the mechanism of different cofferdam heights (0.8 m, 2.0m, and 3.0m) on the diffusion process of natural gas leaks under windless and windy conditions, respectively.…”

Section: Introductionmentioning

confidence: 99%

Study on the Characteristics of Single Tank Leakage Explosion Accidents in Tank Farm

Oyang,

Song,

et al. 2024

Preprint

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To quantitatively evaluate the consequences of a chain-detonation accident from a single tank leak in a tank farm, this paper simulates a leak-detonation accident based on the computational fluid dynamics (CFD) model with three different arrangements of field, one-way and L-shape distribution, and evaluates its impact on personnel and buildings. It combines the diffusion of combustible gases with subsequent deflagration due to accidental ignition. The diffusion behavior of the leaking gas with the wind is predicted and the danger zone created within the tank area is evaluated. Subsequently, a deflagration scenario due to the ignition of the flammable gas is simulated predicting the overpressure and high-temperature deflagration loads. Finally, the impact of a leaked gas deflagration on other tanks and personnel in the tank farm was evaluated. The hazardous area resulting from the diffusion of the leaking gas is mainly located on the right of the leaking tank. The hazards posed by different distribution arrangements of tank types also differed. The minimum radius to ensure safety under deflagration overpressure is 11.97 m. The present work is conducive to the determination of the safe distance between individual tanks in the new tank farm and the formulation of the safety protection.

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Experiment and simulation research of evolution process for LNG leakage and diffusion

Cited by 26 publications

References 8 publications

Simulation analysis and freshness prediction of eggs laid at room temperature

Simulation analysis and freshness prediction of eggs laid at room temperature

The Effect of Ventilation on the Hazards of Hydrogen Release in Enclosed Areas of Hydrogen-Fueled Ship

Study on the Characteristics of Single Tank Leakage Explosion Accidents in Tank Farm

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