Dept. Maritime, Marine, Environment & Safety, NHL University of Applied Sciences, P.O. Box 1080, 8900 CB Leeuwarden, The Netherlands; Environmental Technology sub-department, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Dept. Maritime, Marine, Environment & Safety, NHL University of Applied Sciences, P.O. Box 1080, 8900 CB Leeuwarden, The Netherlands.
Mar Pollut Bull. 2016 Sep 15;110(1):184-193. doi: 10.1016/j.marpolbul.2016.06.063. Epub 2016 Jun 24.
Viscosity plays an important role in dispersion of spilled surface oil, so does adding chemical dispersants. For seven different oil grades, entrainment rate and initial droplet size distribution were investigated using a plunging jet apparatus with coupled camera equipment and subsequent image analysis. We found that amount of oil entrained is proportional to layer thickness and largely independent of oil properties: A dispersant dose of 1:200 did not result in a significantly different entrainment rate compared to no dispersants. Oil viscosity had a minor to no influence on entrainment rate, until a certain threshold above which entrainment was impeded. The mean droplet size scales with the modified Weber number as described by Johansen. The obtained results can help improve dispersion algorithms in oil spill fate and transport models, to aid making an informed decision about application of dispersants.
粘度在溢油的分散中起着重要作用，添加化学分散剂也是如此。对于七种不同的油类，使用带有耦合摄像设备的 plunging jet 装置和随后的图像分析来研究夹带率和初始液滴尺寸分布。我们发现，夹带的油量与层厚度成正比，并且在很大程度上与油的性质无关：与不添加分散剂相比，添加 1:200 剂量的分散剂并没有导致夹带率有显著差异。油的粘度对夹带率的影响较小或没有影响，直到达到一定的阈值，超过该阈值后，夹带就会受到阻碍。平均液滴尺寸与 Johansen 描述的修正 Weber 数成比例。所得到的结果可以帮助改进溢油命运和输运模型中的分散算法，以帮助在应用分散剂方面做出明智的决策。
