The asymmetry of the flow in stacks means that flow velocity must be measured at several

Chapter 13, Problem 13.17

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The asymmetry of the flow in stacks means that flow velocity must be measured at several locations on the cross-flow plane. Consider the cross section of the cylindrical stack shown. The two access holes through which probes can be inserted arc separated by 90. Velocities can be measured at the five points shown (five-point method). a. Determine the ratio r ml D such that the areas of the five measuring segments are equal. b. Determine the ratio riD (probe location) that corresponds to the centroid of the segment. c. The data in the table are taken for a stack 2 m in diameter in which the gas temperature is 300C, the pressure is 110 kPa absolute, and the gas constant is 400 }/kg K. The data represent the deflection on a water manometer connected to a Pilot-static tube located at the measuring stations. Calculate the mass flow rate.