Pipe wall Pipe wall Nut Pipe threads Flange Flange -Orifice plate vena contracta point of maximum constriction) -Stud Nut
An organic fluid with a density of 50 lbm/ft3, and a viscosity of 1.8 cP is flowing in a
2-in ID pipe at a rate of 100 gpm. There is an orifice-plate meter with flange taps and an
orifice diameter of 1.25 in. An illustration is shown below.
(a) What are the Reynolds numbers upstream of the orifice plate, Reu, and also right
at the point at which the fluid passes through the orifice plate, Reo? [Reu = 70337. Reo =
112,554]
(b) Estimate the maximum average fluid velocity in the pipe to avoid turbulence
within the orifice opening. [~ 0.49 ft/s]
(c) If all variables were kept the same (e.g., flow rate, pipe geometry) except that the
fluid was switched to a gas, would the maximum average fluid velocity you calculated in
part (b) increase or decrease, and why?
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