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Boundary Layer Theory Approach To The Concentration Layer Adjacent To A Ceiling Wall Of A Hydrogen Leakage: Far Region

机译:氢泄漏顶壁附近浓缩层的边界层理论方法:远区

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The field of the hydrogen leakage in partially open space can be divided into two main regions according to the importance of the hydrogen concentration distribution and the flow behavior. These two regions are the jet region and the boundary layer region which are adjacent to the ceiling wall of the space, resulting from impinging the hydrogen jet to the wall. The boundary layer region in turn can be divided into two regions, according to the modeling of the flow. These regions are the stagnation-point boundary layer region and the far boundary layer region. Previously, we studied the region of stagnation-point flow (Hiemenz flow) [El-Amin MF, Kanayama H. Boundary layer theory approach to the concentration layer adjacent to a ceiling wall at impinging region of a hydrogen leakage. Int J Hydrogen Energy, in press.]. The current paper is devoted to analyze the far region of the boundary layer adjacent to the ceiling wall using the boundary layer theory. Also, an experiment has been conducted on the hydrogen leakage in partially open space to estimate the concentration distribution vertically at the center of the domain under the ceiling wall. In order to verify the boundary layer theory approach, a comparison between the measurements and the boundary layer theory approximations is investigated and the results showed a good agreement. The wall shear stress, the local friction factor, the friction drag and the non-dimensional drag coefficient of the ceiling wall are calculated. Also, both momentum and concentration boundary layer thicknesses are estimated.
机译:根据氢气浓度分布和流动行为的重要性,可将部分开放空间中氢气泄漏的区域分为两个主要区域。这两个区域是射流区域和边界层区域,它们是通过将氢射流撞击壁而与空间的顶壁相邻的。根据流的建模,边界层区域又可以分为两个区域。这些区域是停滞点边界层区域和远边界层区域。以前,我们研究了停滞点流(Hiemenz流)[El-Amin MF,金山H.的领域。边界层理论方法接近于氢泄漏影响区域中与顶壁相邻的浓度层。 Int J氢能,印刷中。本文致力于利用边界层理论来分析与天花板相邻的边界层的远区域。另外,已经对部分开放空间中的氢泄漏进行了实验,以估计顶壁下方区域中心处的垂直浓度分布。为了验证边界层理论方法,对测量值与边界层理论近似值进行了比较,结果表明有很好的一致性。计算了天花板的剪力,局部摩擦系数,摩擦阻力和无量纲阻力系数。同样,动量和浓度边界层厚度都被估计。

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