声波作用下液滴碰并沉降及其氢氧同位素特征*

液滴沉降过程中会与环境水汽发生物质交换。论文通过小尺度室内实验,研究了低频声波作用下液滴碰并沉降及其与气室环境水汽氢氧同位素交换特征。研究结果证实液滴沉降过程中存在同位素交换,该过程受声波显著影响。声波作用后液滴粒径增大,液滴沉降后汇集水中重同位素出现富集。液滴与环境水汽氢氧同位素交换强度与液滴初始粒径呈正相关,声波对大液滴群影响的显著性水平可达0.05。该研究可为室外声波增雨雪试验效果评价提供理论参考依据。

The hydrogen and oxygen isotope characteristic of droplet collision and deposition under the action of acoustic wave

There is material exchange between droplet and environmental water vapor in the process of droplet deposition, resulting in the change of hydrogen and oxygen isotopes. In this paper, it studied droplet characteristics of hydrogen and oxygen isotopes and isotopes exchange with environmental water vapor in the process of droplet colliding and settling under the action of low-frequency strong sound waves, through small-scale laboratory experiments, and the control equations of isotopes exchange is established. The results show that there is isotope exchange in the process of droplet deposition,this process is significantly influenced by sound wave. Compared with the natural deposition process, the acoustic wave enhanced the isotopes exchange between the droplet and the environment water vapor. The specific manifestations are: the droplet size increased, the molecular diffusion coefficient of the droplet increased, and the heavy isotopes in the accumulated water enriched under the action of acoustic wave. In addition, the hydrogen and oxygen isotopes exchange intensity under the influence of sound wave is positively correlated with the initial droplet size, and the significant level of the large droplets group can reach 0.05.