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首页> 外文期刊>International Journal of Heat and Mass Transfer >Natural circulation flow distribution within a multi-branch manifold
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Natural circulation flow distribution within a multi-branch manifold

机译：多分支歧管内的自然循环流量分布

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摘要

Natural circulation systems are extensively used in different applications but they need to be fully characterized to understand their behavior under different boundary conditions. CFD tools provide means to analyze these systems, however, they need additional experimental data to be validated. Experimental measurements of the flow distribution within a multiple-branch manifold under natural circulation have been conducted using PIV. Measurements have demonstrated that the flow within the risers behave similarly, differing between 6.68% and 12.63% in speed and vertical velocity, and between 8.7% and 17.5% for vertical turbulence strength at selected heights. A back-flow region has been observed at the bottom of the main channel, with an increasing cross sectional area moving far from the manifold inlet, while stream-wise flow occupies the top section of the main channel. The experimental activity has also produced a complete experimental data set with first and second order statistics of the flow that can be used for CFD code validation. (C) 2019 Elsevier Ltd. All rights reserved.
机译：自然循环系统广泛用于不同的应用中，但需要对其进行充分表征以了解其在不同边界条件下的行为。 CFD工具提供了分析这些系统的方法，但是，它们需要其他实验数据进行验证。使用PIV已进行了自然循环下多分支歧管内流量分布的实验测量。测量表明，立管内的流动行为相似，速度和垂直速度之间的差异介于6.68％和12.63％之间，选定高度的垂直湍流强度之间的差异介于8.7％和17.5％之间。在主通道底部观察到一个回流区域，截面积逐渐增加，远离歧管入口，而沿流方向的流量则占据了主通道的顶部。实验活动还产生了具有可用于CFD代码验证的流程的一阶和二阶统计量的完整实验数据集。 （C）2019 Elsevier Ltd.保留所有权利。

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