The relation between the depth of gate and the Archimedes flow length is nonlinear, and the H-L curve is of obvious wave.

• 浇口尺寸与螺旋线流动长度关系曲线 (L -H曲线 )的变化不是单调的递增或递减 ,曲线形状呈较为明显的“波浪”形 ;