The optimum passage section figure of rectangle is square, and the rectangle has 4 optimum comer circular arcs which make the hydraulic loss of friction loss of per unit length passage the least.
矩形流道断面以正方形为最优，且存在最优角圆，使单位长流道沿程水力损失最小。
The optimum passage section figure of rectangle is square, and the rectangle has 4 optimum comer circular arcs which make the hydraulic loss of friction loss of per unit length passage the least.
矩形流道断面以正方形为最优，且存在最优角圆，使单位长流道沿程水力损失最小。
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