12.52 Eisinger et al. (Transactions of the ASME, 2003)

conducted laboratory scale model tests of one simulated stack liner exposed to airflow at ambient atmospheric conditions. The tests were conducted at three different flow velocities

( m/s) to obtain baseline data and data with two and three guide vanes inserted into the 90-

degree bends of the pipe. Two replications of each combination were tested, and the maximum acoustic pressure (P Pa) and the pressure drop through the bends ( Pa) were recorded as shown in table below.

a For measuring the maximum acoustic pressure, is there any interaction effect between the flow velocity and the number of guide vanes inserted?
For measuring the pressure drop, is there any interaction effect between the flow velocity and the number of guide vanes inserted?
b Does the mean maximum acoustic pressure differ significantly by the flow velocity?
Does the mean pressure drop differ significantly by the flow velocity?
c Does the mean maximum acoustic pressure differ significantly by the number of guidelines used?
Does the mean pressure drop differ significantly by the number of guidelines used?

a What type of design does this represent?
b Is there evidence of a difference in the mean number of cars per day at the four locations?
c Estimate the difference between the mean numbers of cars that -pass locations I and III each weekday.

Transcribed Image Text:

v m/s No Vanes 2 Guide Vanes 3 Guide Vanes P P P 21.5 0.408 202 0.185 130 0.173 130 0.538 199 0.189 132 0.185 132 23.5 0.653 230 0.303 160 0.292 160 0.853 238 0.360 161 0.399 161 24.5 0.860 250 0.387 170 0.343 170 1.100 254 0.530 172 0.443 172