Q-4 The apparatus shown in the figure is used to measure the velocity 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 sufficiently large that the elevation of the fluid in it does not change significantly when fluid moves up the leg of the manometer. The air in the duct is at a temperature of 20°C, and the pressure is 150 kPa. The manometer liquid has a specific gravity of 0.7, and the slope of the leg is 30°. When there is no flow in the duct, the liquid surface in the manometer lies at 2.3 cm on the slanted scale. When there is flow in the duct, 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. Q-4 The apparatus shown in the figure is used to measure the velocityof air at the center of a duct having a 10 cm diameter. A tube mountedat the center of the duct has a 2 mm diameter and is attached to oneleg of a slant-tube manometer. A pressure tap in the wall of the duct isconnected to the other end of the slant-tube manometer. The well of10 cmthe slant-tube manometer is sufficiently large that the elevation of thefluid in it does not change significantly when fluid moves up the leg ofp = 150 kPaT= 20°Cthe manometer. The air in the duct is at a temperature of 20°C, andthe pressure is 150 kPa. The manometer liquid has a specific gravity30of 0.7, and the slope of the leg is 30°. When there is no flow in the duct,the liquid surface in the manometer lies at 2.3 cm on the slanted scale.When there is flow in the duct, the liquid moves up to 6.7 cm on theslanted scale. Find the velocity of the air in the duct. Assuming auniform velocity profile in the duct, calculate the rate of flow of the air.S = 0.76.7 cm- 2.3 cm

Solution; Given that; Diameter of duct=10 cm Diameter of mounted tube=2 mm Temperature of air T=20oC…

Answered: Q-4 The apparatus shown in the figure…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q-4 The apparatus shown in the figure is used to measure the velocity 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 sufficiently large that the elevation of the fluid in it does not change significantly when fluid moves up the leg of the manometer. The air in the duct is at a temperature of 20°C, and the pressure is 150 kPa. The manometer liquid has a specific gravity of 0.7, and the slope of the leg is 30°. When there is no flow in the duct, the liquid surface in the manometer lies at 2.3 cm on the slanted scale. When there is flow in the duct, 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.

Transcribed Image Text:Q-4 The apparatus shown in the figure is used to measure the velocity 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 10 cm the slant-tube manometer is sufficiently large that the elevation of the fluid in it does not change significantly when fluid moves up the leg of p = 150 kPa T= 20°C the manometer. The air in the duct is at a temperature of 20°C, and the pressure is 150 kPa. The manometer liquid has a specific gravity 30 of 0.7, and the slope of the leg is 30°. When there is no flow in the duct, the liquid surface in the manometer lies at 2.3 cm on the slanted scale. When there is flow in the duct, 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. S = 0.7 6.7 cm - 2.3 cm

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