Role of Contamination in Optimal Droplet Production by Collective Bubble Bursting
Role of Contamination in Optimal Droplet Production by Collective Bubble Bursting
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DOI：
10.1029/2021gl096740
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发表时间：
2022-01-16
影响因子：
5.2
通讯作者：
Deike, L.
中科院分区：
文献类型：
--
作者：
Neel, B.;Erinin, M. A.;Deike, L.
气泡在海面破裂产生水滴，形成海洋气溶胶。水被生物或人为来源的表面活性剂污染或富集，长期以来一直被认为会影响气泡破裂过程和喷雾成分。然而，尽管对单个破裂事件的物理学的理解有所提高，但对破裂气泡组装的物理化学条件的作用的定量理解仍然难以捉摸。我们目前的实验下降生产毫米，集体爆破气泡，根据不同的表面活性剂浓度和气泡密度。我们表明，超微米液滴（半径大于35 μ m）的生产是非单调的表面活性剂浓度的增加。对于寿命短、分布稀疏且不聚结的气泡，爆破效率最佳。我们确定了污染物对表面气泡排列的综合作用，以及喷射液滴生产过程对爆裂效率的影响。简明语言概要了解主要海洋喷雾气溶胶的产生及其对气象和环境变量的依赖性，对于模拟用于分解漏油的分散剂的潜在健康不利影响至关重要，以及辐射过程和云的微物理特性。我们的实验表明，受污染的水的化学性质和液滴生产的物理机制之间的耦合，当一个气泡破裂控制气溶胶生产的效率在集体气泡破裂，并揭示了一个最佳的生产制度在中间污染。这项基础研究为改进污染水中气溶胶产生的预测铺平了道路。
Gas bubbles bursting at the sea surface produce drops, which contribute to marine aerosols. The contamination or enrichment of water by surface-active agents, of biological or anthropogenic origin, has long been recognized as affecting the bubble bursting processes and the spray composition. However, despite an improved understanding of the physics of a single bursting event, a quantitative understanding of the role of the physico-chemical conditions on assemblies of bursting bubbles remains elusive. We present experiments on the drop production by millimetric, collective bursting bubbles, under varying surfactant concentration and bubble density. We demonstrate that the production of supermicron droplets (with radius larger than 35 mu m) is non-monotonic as the surfactant concentration increases. The bursting efficiency is optimal for short-lived, sparsely distributed and non-coalescing bubbles. We identify the combined role of contamination on the surface bubble arrangement and the modification of the jet drop production process in the bursting efficiency.Plain Language Summary Understanding the production of primary ocean spray aerosol and its dependence on meteorological and environmental variables is critical for modeling potentially health-adverse effects from dispersants used to break down oil spills, as well as radiative processes and cloud microphysical properties. We demonstrate experimentally that the coupling between the chemical properties of contaminated water and the physical mechanism of droplet production when a bubble bursts controls the efficiency of aerosols production during collective bubble bursting, and reveals an optimal production regime at intermediate contamination. This fundamental study paves the way to improved predictions of aerosol production in contaminated water.