Walking with coffee: Why does it spill?
Walking with coffee: Why does it spill?
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DOI：
10.1103/physreve.85.046117
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发表时间：
2012-04-26
影响因子：
2.4
通讯作者：
Krechetnikov, R.
中科院分区：
文献类型：
--
作者：
Mayer, H. C.;Krechetnikov, R.
在忙碌的生活中，我们几乎所有人都要端着一杯咖啡走路。虽然我们经常打翻饮料，但这种熟悉的现象从未被系统地研究过。在这里，我们报告了一项实验研究的结果，在不同的行走速度和杯子中的初始液位下，咖啡溢出的条件。从动力系统和流体力学的角度分析了这些观测结果，并借助这里建立的模型进行了分析。事实证明，常见杯子大小、咖啡性质和行走时生物力学的特殊性是导致溢出现象的原因。所研究的问题是一个例子，说明了由于行走的个体的生物力学而导致的杯子的复杂运动与其中的低粘度液体动力学之间的相互作用。
In our busy lives, almost all of us have to walk with a cup of coffee. While often we spill the drink, this familiar phenomenon has never been explored systematically. Here we report on the results of an experimental study of the conditions under which coffee spills for various walking speeds and initial liquid levels in the cup. These observations are analyzed from the dynamical systems and fluid mechanics viewpoints as well as with the help of a model developed here. Particularities of the common cup sizes, the coffee properties, and the biomechanics of walking proved to be responsible for the spilling phenomenon. The studied problem represents an example of the interplay between the complex motion of a cup, due to the biomechanics of a walking individual, and the low-viscosity-liquid dynamics in it.