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A comparison of small scale laboratory experiments with the environmental protection agency recommended dense gas dispersion models: An assessment of the validity of salt bath modeling of atmospheric flows.

机译：小型实验室实验与环境保护局的比较推荐使用密集的气体扩散模型：评估盐浴模拟大气流动的有效性。

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摘要

Accurate dense gas dispersion modeling is important in a number of fields from modeling smoke movement in a room to the spreading of dense toxic gas releases such as resulted from the Chlorine spill in Graniteville, SC in 2005. To this end, a series of small scale laboratory experiments using instantaneous releases of a cylindrical, finite volume of dense salt water were performed. In the experiments, the horizontal spread of the dense liquid over a flat surface (i.e. gravity current front position over time) was measured.;The results of these small scale experiments were compared to two dense gas dispersion models (DEGADIS and SLAB) for large releases of dense gas in low wind scenarios. The goal of this work is to see if the small scale laboratory experiments can be used to model large scale buoyancy driven flows. The dense gas release models were also compared to each other to see if their results were similar. Data from both the small scale lab experiments and the large scale models were also compared to previously published experimental data.;The raw experimental data was non-dimensionalised with front position scaled on the initial cylinder radius and time scaled on H/g' where H is the cylinder height and g' is the reduced gravity of the salt water. This scaling approach collapsed the data onto a series of curves each representing a different cylinder aspect ratio. To account for the dependence of the spreading rate on the aspect ratio, a scaling scheme developed by Huq (1996) was adopted. This scaling resulted in approximate collapse of all the experimental data onto a single curve. The data also agreed well with the experimental data of Huq (measured using a sector tank) as well as the simulation data from DEGADIS, however, the SLAB simulation data followed a completely different curve.
机译：精确的致密气体扩散建模在许多领域都很重要，从建模房间中的烟雾运动到扩散有毒的有害气体扩散（例如2005年南卡罗来纳州Graniteville的氯泄漏造成的扩散）。为此，一系列小规模使用瞬时释放量有限的圆柱状浓盐水进行了实验室实验。在实验中，测量了稠密液体在平坦表面上的水平分布（即重力电流的前部位置随时间的变化）。；将这些小规模实验的结果与两种稠密气体扩散模型（DEGADIS和SLAB）进行了比较在低风情况下释放高浓度的气体。这项工作的目的是看是否可以将小型实验室实验用于模拟大型浮力驱动的水流。还对稠密的气体释放模型进行了比较，以查看它们的结果是否相似。还将来自小型实验室实验和大型模型的数据与先前发布的实验数据进行了比较;原始实验数据未进行尺寸标注，前位置标定了初始圆柱体半径，时间标定了H / g'，其中H是圆柱体高度，而g'是盐水的降低的重力。这种缩放方法将数据折叠到一系列曲线上，每个曲线代表一个不同的圆柱长宽比。为了说明扩展率对长宽比的依赖性，采用了Huq（1996）开发的缩放方案。这种缩放导致所有实验数据近似崩溃到一条曲线上。数据也与Huq的实验数据（使用扇形储罐测量）以及DEGADIS的模拟数据非常吻合，但是，SLAB模拟数据遵循完全不同的曲线。

著录项

  • 作者

    Betz, Katie.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2010
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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