现象的解释早年就有了


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送交者: whoami 于 2011-09-01, 19:38:26:

回答: 为什么桌面上的咖啡滴干了后外圈颜色深? 由 whoami 于 2011-09-01, 19:07:33:

这里介绍的是运动学动力学的一些细节研究,没多大意思。

引用:
The physical picture that emerged was beautiful and simple: As the droplet dries, the liquid evaporating from the thinning outer edge, where the contact angle θ is shrinking to zero, must be replenished by liquid from the drop’s interior. This sets up a strong outward flow in the solvent, which carries most of the solute to the contact line




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