孔板流量计，针对充满圆管的液体或气体的流量计算公式-Orifice Flowmeter, for a tube filled with liquid or gas flow is calculated

已知流量，管道直径，运动粘度，选择管道材料，计算管道阻尼-Known flow rate, pipe diameter and kinematic viscosity, select the pipe material, pipe damping calculation