从弯曲液体的表面张力出发，研究了三角形毛细管内的毛细现象.利用Matlab 数值模拟，讨论了不同形状液面下竖直方向的表面张力，液面上升高度与边长之间的关系，毛细管内液柱上升的速度等相关问题.结果表明，首先相同的口径下，三角形毛细管内液面上升高度要比圆形毛细管大; 其次讨论液面上升速度时，必须要考虑摩擦力的影响，才能与实际情况一致.

Based on the surface tension of curved liquid surface，the capillarity in triangular capillary is studied. Using Matlab numerical simulation，the surface tensions of two kinds for liquid surface with different contact angle functions，the height and velocity of liquid in the capillaries are calculated. The results show that as the same caliber，the height in triangular capillary is larger than that in circular capillary. Considering the impact of friction f = 1.732×10-2y N the velocity of liquid in capillary is consistent with the actual situation.