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首页> 外文期刊>International Journal of Heat and Mass Transfer >Coaxial plumes: Theory and experiment
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Coaxial plumes: Theory and experiment

机译：同轴羽毛：理论与实验

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摘要

Boussinesq, turbulent plume flows have been successfully described by the well-established model of Morton et al (1956), however, the more complicated case of a coaxial plume consisting of an inner circular plume and an outer annular plume is more challenging to describe theoretically. The difficulties in question arise because of the turbulent exchange of mass, momentum and buoyancy between the inner plume, the outer plume and the ambient. The present study explores the possibility of using a double plume model for coaxial plumes. Model predictions are compared against analogue experimental measurements where, in the latter case, we employ a planar laser-induced fluorescence technique for purposes of visualizing the flow and for measuring concentrations of coaxial plumes. The plumes in question issued from a specially-designed coaxial nozzle, are of moderate Reynolds number (approximately 500) and are of intermediate flux-balance parameter indicating a plume that is either slightly lazy or slightly forced. A whole-field comparison of the scalar concentration between theory and experiment is conducted to obtain the optimal entrainment coefficients. The advantage and limitation of using coaxial plumes to abate the visible plume discharged by cooling towers is discussed.
机译：已经成功地描述了Morton等人（1956）的良好建立的模型成功描述了Boussinesq，湍流流量，然而，由内圆羽流和外部环形羽流构成的同轴羽流的案例更加复杂更具挑战性，以理论上描述。由于内部羽流，外壳和环境之间的湍流交流，所造成的湍流，动量和浮力，所困难。本研究探讨了使用双羽模型同轴羽毛的可能性。将模型预测与模拟实验测量进行比较，在后一种情况下，我们采用平面激光诱导的荧光技术，以便可视化流动并用于测量同轴羽毛的浓度。从专门设计的同轴喷嘴发出的问题的羽毛是中度雷诺数（约500），并且是中间磁通平衡参数，指示略微懒惰或略微强制的羽流。进行了理论与实验之间的标量浓度的整体场比较，以获得最佳夹带系数。讨论了使用同轴羽毛以减轻冷却塔排出的可见羽流的优点和限制。

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