Experimental investigation of a line plume in a filling box
Experimental investigation of a line plume in a filling box
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填充箱内线羽流的实验研究
DOI：
10.1007/s10652-020-09754-6
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发表时间：
2020
影响因子：
2.2
通讯作者：
Kaye, Nigel B.
中科院分区：
文献类型：
--
作者：
Akhter, Romana;Kaye, Nigel B.
进行了一系列实验，以量化由横跨整个外壳宽度的线状羽流驱动的灌装箱的动力学。测试了三种构型，即对称(位于中心位置的羽流)、壁面约束(羽流附着在端壁上)和不对称。标准填充盒模型很好地描述了对称构型和壁面边界构型的前沿运动。锋面运动结果表明，对于中心位置的羽流和附壁羽流，卷吸系数()的典型值都可以准确地预测其锋面运动。这与其他研究相反，这些研究表明，壁面约束的羽流具有明显较低的夹带系数。标准的灌装箱模型因配置不对称而被打破。由于烟柱离一面墙比另一面墙更近，从端壁扩散和反射的烟柱流出在不同的时间返回到烟柱。这造成了羽状物之间的压力不平衡，导致羽状物向最近的壁急剧弯曲。对恒定通量重力流的羽流分析表明，羽流的外流速度在单位宽度的羽流浮力通量的立方根上标度，这一结果得到了进一步的实验证实。这一结果被用来量化羽流弯曲和标准灌装盒模型崩溃的时间。
A series of experiments were conducted to quantify the dynamics of a filling box driven by a line plume that spans the full width of the enclosure. Three configurations were tested namely symmetric (centrally located plume), wall-bounded (plume attached to an end wall), and asymmetric. The front movement for the symmetric and wall-bounded configurations was well described by the standard filling box model. The front movement results indicate that the typical value of the entrainment coefficientfor an unconfined plume () could be used to accurately predict the front movement for both the centrally located plume and the wall-attached plume. This is in contrast to other studies that suggest that wall-bounded plumes have a significantly lower entrainment coefficient. The standard filling box model broke down for the asymmetric configuration. As the plume was closer to one wall than the other, the plume outflows that spread out and reflected off the end walls returned to the plume at different times. This created a pressure imbalance across the plume that caused the plume to bend sharply toward the nearest wall. Analysis of the plume outflow as a constant flux gravity current showed that the outflow velocity scaled on the cube root of the plume buoyancy flux per unit width, a result confirmed by further experiments. This result was used to quantify the time at which the plume bends and the standard filling box model breaks down.
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影响因子：
2.2
作者：
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通讯作者：
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作者：
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影响因子：
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作者：
BAINES, WD;TURNER, JS
通讯作者：
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