请问飞机从高处坠落水中，被水面的击碎，这个力是不是表面张力？

ss上尉

如果是，请给出一个详细的解释。因为这个问题在某科学论坛上争论了半天，但是没有学流体力学的大虾出来压阵，谁业无法说服谁。多数人都认为水的表面张力在此过程中作用甚微，但是我认为主要就是水的表面张力起作用，因为高速撞击之下，水可以视为刚体。

woodland

LZ所说的“表面张力”是什么力？飞机坠落在水泥地面上时，受冲击破坏时受到的力是否也属于你说的“表面张力”？

ycchen100

1.先回应本题。答案是：不是表面张力的作用。
2.在高速撞击之下，水的确可以视为刚体。(所以飞机从高处坠落水中，会被水面击碎，如同坠落在水泥地面上。)
Why?
3.假设飞机从高处是坠落在一片细沙上，而每粒细沙的大小和水分子一样，飞机会被细沙击碎吗？(细沙之间无Van de Waals force。)

ycchen100

If this airplane flies in the outer space (no gravitational field) towards a pool of "unconfined" water, do you think the airplane will crash? ;)

ycchen100

If your answer to the above question is "NO", then you understand almost.
But if you still couldn';t figure out exactly why, let me give you a hint. The answer is an eight-letter word you frequently see in your fluid mechanics course. It starts with p...

ycchen100

Now, to understand more about surface tension, here is a good reference:
The origin of surface tension in liquids
by W. C. Thoburn
published in "The Physics Teacher" Volume 15, Issue 4, pp. 234-236, April 1977.
The weblink is http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PHTEAH000015000004000234000001&idtype=cvips&gifs=yes
any one can do us a favour to put the paper up here?