t***u
发帖数: 20182 | 1 Weissenberg effect
什么是non-zero first normal stree difference?我的想法是不是就象飞天转轮一下
给甩起来了？
From wiki：
The Weissenberg effect is a common phenomenon that occurs when a spinning
rod is placed into a solution of liquid polymer. Instead of being thrown
outward, entanglements cause the polymer chains to be drawn towards the rod.
It is named after Karl Weissenberg.
Technically, it is due to a non-zero first normal stress difference. The
strain tensor of the motion of turning the rod produces a non-zero
diffe |
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