静水中珊瑚颗粒沉降运动的实验研究

IF 3.6 2区 工程技术 Q1 MECHANICS
Jie Chen, Zhen Yao, Fei He, Changbo Jiang, Chao Jiang, Zhiyuan Wu, Bin Deng, Yuannan Long, Cheng Bian
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引用次数: 0

摘要

了解珊瑚颗粒的沉降运动对于保护珊瑚礁系统和恢复相关生态系统非常重要。本文利用光学显微镜测量珊瑚颗粒的形状参数,并通过基于粒子过滤的物体跟踪重建三维轨迹,对沉降运动进行了一系列实验室实验研究。根据三维轨迹、螺旋半径变化和速度频谱,划分出三种特征沉降状态,即翻滚、混沌和飘动。结果表明,如果随机拾取一颗珊瑚颗粒,那么三种状态出现的概率分别约为 $26\\%$、$42\\%$ 和 $32\\%$。我们已经证明,首先,无量纲沉降速度一般随非量纲直径和科里形状系数的增大而增大;其次,阻力系数一般随雷诺数和科里形状系数的增大而减小。在此基础上,我们进一步证明了现有模型在预测珊瑚颗粒沉降速度和阻力系数方面的适用性。最后,我们提出了预测沉降速度的扩展模型。这项研究有助于更好地理解沉降运动,并提高我们对具有复杂几何形状的珊瑚颗粒的沉降速度的预测能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on the settling motion of coral grains in still water
Understanding settling motion of coral grains is important in terms of protection of coral reef systems and resotoration of the associated ecosystems. In this paper, a series of laboratory experiments was conducted to investigate the settling motion, using optical microscopy to measure shape parameters of coral grains and the particle-filtering-based object tracking to reconstruct the three-dimensional trajectory. Three characteristic descent regimes, namely, tumbling, chaotic and fluttering, are classified based on the three-dimensional trajectory, the spiral radius variation and the velocity spectrum. It is demonstrated that if one randomly picks up one coral grain, then the probabilities of occurrence of the three regimes are approximately $26\,\%$ , $42\,\%$ and $32\,\%$ , respectively. We have shown that first, the dimensionless settling velocity generally increases with the non-dimensional diameter and Corey shape factor and second, the drag coefficient generally decreases with the Reynolds number and Corey shape factor. Based on this, the applicability of existing models on predicting settling velocity and drag coefficient for coral grains is demonstrated further. Finally, we have proposed extended models for predicting the settling velocity. This study contributes to better understanding of settling motion and improves our predictive capacity of settling velocity for coral grains with complex geometry.
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来源期刊
CiteScore
6.50
自引率
27.00%
发文量
945
审稿时长
5.1 months
期刊介绍: Journal of Fluid Mechanics is the leading international journal in the field and is essential reading for all those concerned with developments in fluid mechanics. It publishes authoritative articles covering theoretical, computational and experimental investigations of all aspects of the mechanics of fluids. Each issue contains papers on both the fundamental aspects of fluid mechanics, and their applications to other fields such as aeronautics, astrophysics, biology, chemical and mechanical engineering, hydraulics, meteorology, oceanography, geology, acoustics and combustion.
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