Maximal submergence in dense granular suspensions
IF 0.6
4区 教育学
Q4 EDUCATION, SCIENTIFIC DISCIPLINES
引用次数: 0
Abstract
How far can a person sink downwards in quicksand? Experience would seem to suggest that there is low risk of submerging completely, but it is not easy to demonstrate this because of the complex rheology of granular suspensions. We study several mathematical models for the sinking of a vertical cylinder downwards into quicksand, finding that an approach with a buoyancy equation modified by drag force gives an unphysical answer. We instead argue that our proposed conclusion is supported by considering the dynamics of vibration-induced compactification of liquid-saturated granular suspensions. We compare quicksand with other non-Newtonian fluids, emphasising that in this case the same model does not apply and that the risk of drowning could be much more significant. We finish by suggesting some relevant experiments that can be performed in a classroom setting.在致密颗粒悬浮液中的最大浸没度
人在流沙中能向下沉入多深？经验似乎表明，完全沉入水中的风险很低，但由于颗粒悬浮物的流变复杂，要证明这一点并不容易。我们研究了几个垂直圆柱体向下沉入流沙的数学模型，发现用阻力修正浮力方程的方法给出了一个不符合实际的答案。相反，我们认为，考虑到液体饱和颗粒悬浮物的振动诱导压实动力学，可以支持我们提出的结论。我们将流沙与其他非牛顿流体进行了比较，强调在这种情况下，相同的模型并不适用，溺水的风险可能要大得多。最后，我们提出了一些可以在课堂上进行的相关实验。
本文章由计算机程序翻译，如有差异，请以英文原文为准。
求助全文
约1分钟内获得全文
求助全文
来源期刊
European Journal of Physics
物理-物理：综合
CiteScore
1.70
自引率
28.60%
发文量
128
审稿时长
3-8 weeks
期刊介绍：
European Journal of Physics is a journal of the European Physical Society and its primary mission is to assist in maintaining and improving the standard of taught physics in universities and other institutes of higher education.
Authors submitting articles must indicate the usefulness of their material to physics education and make clear the level of readership (undergraduate or graduate) for which the article is intended. Submissions that omit this information or which, in the publisher''s opinion, do not contribute to the above mission will not be considered for publication.
To this end, we welcome articles that provide original insights and aim to enhance learning in one or more areas of physics. They should normally include at least one of the following:
Explanations of how contemporary research can inform the understanding of physics at university level: for example, a survey of a research field at a level accessible to students, explaining how it illustrates some general principles.
Original insights into the derivation of results. These should be of some general interest, consisting of more than corrections to textbooks.
Descriptions of novel laboratory exercises illustrating new techniques of general interest. Those based on relatively inexpensive equipment are especially welcome.
Articles of a scholarly or reflective nature that are aimed to be of interest to, and at a level appropriate for, physics students or recent graduates.
Descriptions of successful and original student projects, experimental, theoretical or computational.
Discussions of the history, philosophy and epistemology of physics, at a level accessible to physics students and teachers.
Reports of new developments in physics curricula and the techniques for teaching physics.
Physics Education Research reports: articles that provide original experimental and/or theoretical research contributions that directly relate to the teaching and learning of university-level physics.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
