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首页> 美国卫生研究院文献>Scientific Reports >Effect of particle volume fraction on the settling velocity of volcanic ash particles: insights from joint experimental and numerical simulations
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Effect of particle volume fraction on the settling velocity of volcanic ash particles: insights from joint experimental and numerical simulations

机译：颗粒体积分数对火山灰颗粒沉降速度的影响：联合实验和数值模拟的启示

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摘要

Most of the current ash transport and dispersion models neglect particle-fluid (two-way) and particle-fluid plus particle-particle (four-way) reciprocal interactions during particle fallout from volcanic plumes. These interactions, a function of particle concentration in the plume, could play an important role, explaining, for example, discrepancies between observed and modelled ash deposits. Aiming at a more accurate prediction of volcanic ash dispersal and sedimentation, the settling of ash particles at particle volume fractions (ϕp) ranging 10−7-10−3 was performed in laboratory experiments and reproduced by numerical simulations that take into account first the two-way and then the four-way coupling. Results show that the velocity of particles settling together can exceed the velocity of particles settling individually by up to 4 times for ϕp ~ 10−3. Comparisons between experimental and simulation results reveal that, during the sedimentation process, the settling velocity is largely enhanced by particle-fluid interactions but partly hindered by particle-particle interactions with increasing ϕp. Combining the experimental and numerical results, we provide an empirical model allowing correction of the settling velocity of particles of any size, density, and shape, as a function of ϕp. These corrections will impact volcanic plume modelling results as well as remote sensing retrieval techniques for plume parameters.
机译：当前大多数的灰分迁移和扩散模型都忽略了从火山羽流中沉降下来的颗粒-流体（双向）和颗粒-流体加颗粒-颗粒（四向）的相互作用。这些相互作用是烟羽中颗粒浓度的函数，可能起重要作用，例如，可以解释所观察到的灰烬沉积物与模拟灰烬沉积物之间的差异。为了更准确地预测火山灰的散布和沉积，在火山灰中以10 −7 -10 −3 的颗粒体积分数（ϕp）沉降了灰分。实验室实验，并通过数值模拟进行复制，其中首先考虑了双向耦合，然后才考虑了四向耦合。结果表明，forp〜10 −3 时，一起沉降的速度可以比单独沉降的速度快4倍。实验结果和模拟结果之间的比较表明，在沉降过程中，沉降速度很大程度上受颗粒-流体相互作用的影响而增加，但部分受到颗粒与颗粒间相互作用（withp的增加）的阻碍。结合实验和数值结果，我们提供了一个经验模型，可以校正任何大小，密度和形状的颗粒的沉降速度，这是ϕp的函数。这些更正将影响火山羽建模结果以及羽参数的遥感检索技术。

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