圆管子直径比率控制阀门关闭的旋转角度。
The ball-to-pipe diameter ratio governs the handle turning angle at which the valve becomes closed.
曲线形状随液体速度、粘度、管子直径和管壁粗糙度而变化。
The shape of the curve would vary with liquid velocity, viscosity, pipe size, and pipe surface roughness.
这是一组洁净管道阵列，每根管子直径5毫米，其中灌注了混合特种染料的油状液体。
It’s an array of clear tubes, each five milimeters in diameter. The tubes are filled with oil blended with a propietary dye.
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