04 The apparatus shown in the figure is used lo measure the velacily of air at the certer of a duct having a 10 cm diameter. Aube mounted at the center of the duct has a 2 mm diameter and is attached to one leg of a slant-tube manometer. A pressure tap in the wall of the duct is connected to the other end of the slant-tube manometer. The well of 20 em the siant-ube manometer is sufficiently large that the elevation of the 2 fuid in it does not change significanty when fluid moves up the leg of the manometer. The air in the cuct is at a temperature of 20°C, and the pressure is 150 KPa. The manometer liquic has a specific gravity of 0.7, and the slope of the leg is 30". Wher there is no flow in the duct, the liquid surface in the marometer lies at 2.3 am on the slanted scale When there is floav in the cuct, the liquid moves up to 6.7 cm on the slanted scale. Find the velocity of the air in the duct. Assumng a uniform velocity profie in the duct calculate the rate of flow of the air. -23cm
04 The apparatus shown in the figure is used lo measure the velacily of air at the certer of a duct having a 10 cm diameter. Aube mounted at the center of the duct has a 2 mm diameter and is attached to one leg of a slant-tube manometer. A pressure tap in the wall of the duct is connected to the other end of the slant-tube manometer. The well of 20 em the siant-ube manometer is sufficiently large that the elevation of the 2 fuid in it does not change significanty when fluid moves up the leg of the manometer. The air in the cuct is at a temperature of 20°C, and the pressure is 150 KPa. The manometer liquic has a specific gravity of 0.7, and the slope of the leg is 30". Wher there is no flow in the duct, the liquid surface in the marometer lies at 2.3 am on the slanted scale When there is floav in the cuct, the liquid moves up to 6.7 cm on the slanted scale. Find the velocity of the air in the duct. Assumng a uniform velocity profie in the duct calculate the rate of flow of the air. -23cm
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q4 The apparatus shown in the figure is used lo measure the velacily
of air at the center of a duct having a 10 cm diameter. A tube mounted
at the center of the duct has a 2 mm diameter and is attached to one
leg of a slant-tube manometer. A pressure tap in the wall of the duct is
connected to the other end of the slant-tube manometer. The well of
the slant-tube manometer is sufficientiy large that the clevation of the
fluid in it does not change significantiy when fluid moves up the leg of
10 em
r-20C
the manometer. The air in the cuct is at a temperature of 20°C, and
the pressure is 150 kPa. The manometer liquic has a specfic gravity
of 0.7, and the slope of the leg is 30. When there is no flow in the duct,
s-0.7
the liquid surface in the manometer lies at 2.3 cm on the slanted scale.
When there is flow in the cuct, the liquid moves up to 6.7 cm on the
slanted scale. Find the velocity of the air in the duct. Assuming a
uniform velocity profile in the duct calculate the rate of flow of the air.
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