Abstract—

Mass exchange between the atmosphere of turbulent vortex ring and the surrounding medium is investigated in the initial stage of motion using the shadow visualization method. For this purpose, vortex rings in which the liquid has a different density as compared with the density of the surrounding medium are generated. The experiments are carried out for various values of the density differences, the velocities, and the vortex sizes. The characteristic time and space scales of mass exchange are determined. It is concluded that the basic mechanism of mass exchange is turbulent diffusion. The turbulent diffusion coefficient in the atmosphere of vortex ring is estimated using the characteristic time of mass exchange.

中文翻译：

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湍流涡环大气与周围介质之间的质量交换

摘要-

使用阴影可视化方法研究了运动初始阶段湍流涡环大气与周围介质之间的质量交换。为此，产生涡环，其中液体的密度与周围介质的密度不同。对密度差、速度和涡流大小的各种值进行实验。确定了质量交换的特征时间和空间尺度。结论是质量交换的基本机制是湍流扩散。利用质量交换的特征时间估计涡环大气中的湍流扩散系数。