Laminar and axisymmetric vertical jets in a stably stratified environment
Laminar and axisymmetric vertical jets in a stably stratified environment
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稳定分层环境中的层流和轴对称垂直射流
DOI：
10.1016/0017-9310(71)90027-5
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发表时间：
1971
影响因子：
5.2
通讯作者：
B. Gebhart
中科院分区：
文献类型：
--
作者：
A. Tenner;B. Gebhart
实验表明，在稳定的分层环境中，轴对称的、层流的、浮力的射流诱导了环形细胞在其周围的流动。单元的内部部分受射流的粘性剪切作用向上驱动，外部部分受负浮力作用下降。在一定的限制条件下，该细胞沿着低密度射流的薄层移动，并以裹尸布的形式将其包围。裹尸布的流动方向与射流相反，其密度与射流相似。有利于生产护罩的条件要求环境分层稳定，所涉及流体的分子扩散系数极小。紊流射流预计不会产生明显的裹尸布。
Experiments have shown that an axisymmetric, laminar, buoyant jet in a stably stratified environment induces the flow of a toroidal cell around itself. The inner portion of the cell is driven upward by the viscous shearing of the jet, and the outer portion descends due to a negative buoyancy force. Under certain limiting conditions, this cell draws along a thin layer of the lower density jet and surrounds itself with it in the form of a shroud. The shroud flows in a direction opposite to the jet, and its density is similar to that of the jet. Conditions favorable to shroud production require that the environment be stably stratified and that the molecular diffusivities of the fluids involved be extremely small. Turbulent jets are not expected to produce an appreciable shroud.