Monday, July 29, 2013

diffgeom01 沿环四周,AB以外表面对AB面相切大小相等,但不在同一平面上,产生一个向下的合力


The T and N vectors at two points on a plane curve, a translated version of the second frame (dotted), and the change in T: δT'. δs is the distance between the points. In the limit \tfrac{d\mathbf{T}}{ds} will be in the direction N and the curvature describes the speed of rotation of the frame.

https://en.wikipedia.org/wiki/Frenet%E2%80%93Serret_formulas

沿环四周,AB以外表面对AB

有表面张力,与周界垂直,与液面

相切,大小相等,但不在同一平

面上,产生一个向下的合力
3)凹面:

􀁺 AB为弦长球形凹面环作边界

􀁺 环上每点受来自AB外表面的表

面张力,与周边垂直,与凹面相



切,大小相等,不在同一平面,
 
产生一个向上的合力
 
 
􀁺 周边合力为附加压力ps

􀁺 凹面受向下的总压po- ps



比平面受力小


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