Advances in Dense Gas Dispersion Modeling of Accidental Releases over Rough Surfaces during Stable Conditions

Briggs, Gary A.; Britter, Rex; Hanna, Steven R.; Havens, Jerry; King, S. B.; Robins, AG; Snyder, William H.; Steinberg, K.W.

doi:10.1007/978-1-4757-9128-0_52

Cited by 2 publications

(1 citation statement)

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“…Some research has explored the diffusion law through wind tunnel diffusion tests. Ayrault [2] investigated the diffusion law of gas clouds and plumes continuously released by surface sources, and Briggs [3] designed wind tunnel simulation experiments to determine the influence of various environmental factors on heavy gas diffusion. This test can intuitively reflect the actual flow law in engineering; however, it requires higher equipment and is time-intensive.…”

Section: Introductionmentioning

confidence: 99%

Study on the law of harmful gas diffusion and construction of prediction model for manual excavation foundation

Liu¹,

Wang²,

Kong³

2023

3rd International Conference on Applied Mathematics, Modelling, and Intelligent Computing (CAMMIC 2023)

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The structure of an artificial excavation foundation pit is a typical semi-enclosed space, wherein the working space is small, and the natural ventilation is not smooth. This makes it easy to cause the accumulation of harmful gases and threaten the safety of operators. In this work, an artificial excavation foundation pit was used as the study area. Computational fluid dynamics software was employed to simulate the dynamic change law of the gas environment of artificial excavation foundation pits of different sizes (diameter and depth) under the action of natural and mechanical ventilation. The simulation results showed that under natural ventilation, the harmful gas barely dissipates, and thus, mechanical ventilation must be adopted. Under mechanical ventilation conditions, at the same digging depth, the lower the position of the diffusion source, the faster the mass fraction of harmful gas at the monitoring point when it reaches peak value; the deeper the hole, the longer the mass fraction of harmful gases to reach the peak value at the monitoring point, and the more difficult it is for the harmful gas to diffuse. Further, the larger the diameter, the faster the mass fraction of the monitoring point when it reaches the peak, while diameter size has little effect on the dissipation rate. By analyzing the law, a prediction model for changing carbon dioxide gas concentration at a distance of 1.2 m from the bottom of the foundation pit was established. The model can simulate and predict changes in harmful gas concentration in artificial excavation foundation pits.

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Section: Introductionmentioning

confidence: 99%