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首页> 外文期刊>International Journal of Heat and Mass Transfer >Gas-liquid two-phase flow patterns in a miniature square channel with a gas permeable sidewall
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Gas-liquid two-phase flow patterns in a miniature square channel with a gas permeable sidewall

机译：带有透气侧壁的微型方形通道中的气液两相流型

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摘要

Characteristics of air-water two-phase flow patterns in a miniature square channel having a gas permeable sidewall were investigated experimentally. Water was fed into the channel from its entrance, while air was injected uniformly into the channel along the permeable sidewall. This configured two-phase flow problem is encountered in direct feed methanol fuel cells. Flow patterns in both vertical upward and horizontal flows were identified using a high-speed motion analyzer. The visualization shows that the typical flow pattern encountered in the conventional co-current gas-liquid two-phase flow, such as bubbly flow, plug flow, slug flow and annular flow were also observed in the present work. However, unlike the conventional co-current gas-liquid two-phase flow in a channel with gas and liquid uniformly entering from one of its ends, for the flow configuration considered in this work, the stratified flow and wavy flow were not found in horizontal flow. And a so-called "single layer bubbly flow" was found in vertical upward flow, which is characterized by a mono small-gas-bubble layer existing adjacent to the surface of the permeable sidewall with the reminding space occupied by the liquid phase. Four transitional flow patterns such as bubbly-plug flow, bubbly-slug flow, plug-slug flow, and slug-annular flow, were found to exist between the distinct flow patterns. Finally, the flow regime maps for various liquid volumetric fluxes are presented in terms of mass quality versus the volumetric flux of gas phase.
机译：实验研究了具有透气侧壁的微型方形通道中空气-水两相流型的特性。从其入口将水注入通道中，同时沿可渗透侧壁将空气均匀地注入通道中。在直接进给的甲醇燃料电池中会遇到这种配置的两相流问题。使用高速运动分析仪识别垂直向上和水平流动中的流动方式。可视化结果显示，在当前工作中，还观察到了常规并流气液两相流中遇到的典型流型，例如气泡流，塞流，弹塞流和环形流。但是，与传统的并流气液两相流在气体和液体从其一端之一均匀进入的通道中不同，对于这项工作中考虑的流态，在水平方向上没有分层流和波浪流流。并且在垂直向上流动中发现了所谓的“单层气泡流”，其特征在于在可渗透侧壁的表面附近存在一个单气泡小气泡层，其提醒空间被液相占据。发现在不同的流型之间存在四个过渡流型，例如气泡-塞流，气泡-塞流，塞-塞流和塞-环形流。最后，根据质量相对于气相体积通量的关系，给出了各种液体体积通量的流态图。

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