Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Angle of diverging portion of the venturimet...
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Angle of diverging portion of the venturimeter is limited to 7°, because
1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.
2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.
3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.
Which of the above reasons are correct?
- a)1, 2 and 3
- b)1 and 2 only
- c)1 and 3 only
- d)2 and 3 only
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Angle of diverging portion of the venturimeter is limited to 7°, beca...
The pressure at the throat is not affected by the divergence angle, it depends on inlet pressure, inlet diameter and throat diameter (Bernoulli’s equation) whereas the flow separation is affected by the divergence angle.
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Angle of diverging portion of the venturimeter is limited to 7°, beca...
Flow deceleration and adverse pressure gradient:
- The venturimeter is a flow measuring device that consists of a converging section, throat, and a diverging section.
- In the converging section, the fluid accelerates and its velocity increases, causing a decrease in pressure according to Bernoulli's equation.
- At the throat, the fluid reaches its maximum speed and minimum pressure.
- In the diverging section, the fluid decelerates and its velocity decreases, causing an increase in pressure.
- If the angle of the diverging portion is large, the flow decelerates more rapidly, and the pressure increases in the downstream direction.
- This creates an adverse pressure gradient, where the pressure is higher near the walls of the diverging section compared to the centerline.
- An adverse pressure gradient can cause flow separation, leading to turbulence and inaccurate flow measurements.
Flow separation and adverse pressure gradient:
- Flow separation occurs when the fluid fails to follow the streamline and separates from the surface.
- This phenomenon is more likely to occur when there is an adverse pressure gradient.
- When the divergence angle of the venturimeter is large, the adverse pressure gradient becomes significant, increasing the likelihood of flow separation.
- Flow separation disrupts the flow pattern and leads to turbulence, reducing the accuracy of flow measurements.
Negative pressure at the throat:
- The throat of the venturimeter is the narrowest section where the fluid velocity is at its maximum and the pressure is at its minimum.
- If the divergence angle is large, a negative pressure region can be created at the throat.
- This negative pressure obstructs the flow of fluid and can affect the accuracy of flow measurements.
Conclusion:
- From the above explanations, we can conclude that both reasons 1 and 2 are correct.
- Reason 3, which states that a negative pressure is created at the throat obstructing the flow, is not entirely accurate as the obstruction is mainly caused by flow separation due to adverse pressure gradient, rather than a negative pressure itself.
- Therefore, the correct answer is option B, which includes reasons 1 and 2.
- The venturimeter is a flow measuring device that consists of a converging section, throat, and a diverging section.
- In the converging section, the fluid accelerates and its velocity increases, causing a decrease in pressure according to Bernoulli's equation.
- At the throat, the fluid reaches its maximum speed and minimum pressure.
- In the diverging section, the fluid decelerates and its velocity decreases, causing an increase in pressure.
- If the angle of the diverging portion is large, the flow decelerates more rapidly, and the pressure increases in the downstream direction.
- This creates an adverse pressure gradient, where the pressure is higher near the walls of the diverging section compared to the centerline.
- An adverse pressure gradient can cause flow separation, leading to turbulence and inaccurate flow measurements.
Flow separation and adverse pressure gradient:
- Flow separation occurs when the fluid fails to follow the streamline and separates from the surface.
- This phenomenon is more likely to occur when there is an adverse pressure gradient.
- When the divergence angle of the venturimeter is large, the adverse pressure gradient becomes significant, increasing the likelihood of flow separation.
- Flow separation disrupts the flow pattern and leads to turbulence, reducing the accuracy of flow measurements.
Negative pressure at the throat:
- The throat of the venturimeter is the narrowest section where the fluid velocity is at its maximum and the pressure is at its minimum.
- If the divergence angle is large, a negative pressure region can be created at the throat.
- This negative pressure obstructs the flow of fluid and can affect the accuracy of flow measurements.
Conclusion:
- From the above explanations, we can conclude that both reasons 1 and 2 are correct.
- Reason 3, which states that a negative pressure is created at the throat obstructing the flow, is not entirely accurate as the obstruction is mainly caused by flow separation due to adverse pressure gradient, rather than a negative pressure itself.
- Therefore, the correct answer is option B, which includes reasons 1 and 2.
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Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?
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Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?.
Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Civil Engineering (CE).
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ample number of questions to practice Angle of diverging portion of the venturimeter is limited to 7°, because1. Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.2. Flow separation takes place due to adverse pressure gradient when divergence angle is large.3. If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid.Which of the above reasons are correct?a) 1, 2 and 3b) 1 and 2 onlyc) 1 and 3 onlyd) 2 and 3 onlyCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Civil Engineering (CE) tests.
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