1.9. In the orifice meters discussed in Chap. 8 , a flat disk with a central opening of diameter Do is set across a pipe of diameter D, and the pressure drop p across the opening is measured. It is postulated that p is a function of the average fluid velocity in the pipe V, the density of the fluid , the fluid viscosity , and the diameters of the pipe and the opening, D and Do, respectively. Thus p=(V,,,D,Do) Find an acceptable set of dimensionless groups which relate these various factors. Answers: V2=(DoV,DoD) 1.9. In the orifice meters discussed in Chap. 8 , a flat disk with a central opening of diameter Do is set across a pipe of diameter D, and the pressure drop p across the opening is measured. It is postulated that p is a function of the average fluid velocity in the pipe V, the density of the fluid , the fluid viscosity , and the diameters of the pipe and the opening, D and Do, respectively. Thus p=(V,,,D,Do) Find an acceptable set of dimensionless groups which relate these various factors. Answers: V2=(DoV,DoD)