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To avoid the tendency of separation of flow at the throat in a Venturimeter, the ratio of the diameter at the throat to the diameter of the pipe should be
- a)1/16 to 1/8
- b)1/8 to 1/4
- c)1/4 to 1/3
- d)1/3 to 1/2
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
To avoid the tendency of separation of flow at the throat in a Venturi...
The ratio of throat to inlet diameters d2/d1 may range between 0.75 and 0.25, but the most commonly used ratio is 0.50.
A smaller ratio gives a higher difference in the piezometric heads (between the inlet and the throat) which can be measured more accuratedly by a differential manometer. At the same time, a smaller throat (that is a lower d2/d1 ratio) will mean higher throat velocities which may cause pressures low enough to liberate dissolved gases thereby creating conditions for cavitation to set in.
A smaller ratio gives a higher difference in the piezometric heads (between the inlet and the throat) which can be measured more accuratedly by a differential manometer. At the same time, a smaller throat (that is a lower d2/d1 ratio) will mean higher throat velocities which may cause pressures low enough to liberate dissolved gases thereby creating conditions for cavitation to set in.
Most Upvoted Answer
To avoid the tendency of separation of flow at the throat in a Venturi...
Explanation:
Venturimeter is a device used to measure the flow rate of fluids in a pipe. It is based on the principle of Bernoulli's equation, which states that the pressure of a fluid decreases as its velocity increases.
One of the problems that can occur in a Venturimeter is the separation of flow at the throat. This happens when the flow velocity at the throat is too high, causing the fluid to separate from the walls of the Venturimeter and form eddies. This can lead to inaccurate measurements.
To avoid this problem, the ratio of the diameter at the throat to the diameter of the pipe should be in the range of 1/3 to 1/2. This means that the throat diameter should be between one-third and one-half of the pipe diameter.
The reason for this is that a larger throat diameter will result in a lower velocity at the throat, reducing the tendency for flow separation. However, if the throat diameter is too large, the pressure drop across the Venturimeter will be too small, leading to less accurate measurements.
On the other hand, a smaller throat diameter will result in a higher velocity at the throat, increasing the tendency for flow separation. This can also lead to inaccurate measurements.
Therefore, a throat diameter in the range of 1/3 to 1/2 of the pipe diameter is optimal for accurate and reliable measurements using a Venturimeter.
Venturimeter is a device used to measure the flow rate of fluids in a pipe. It is based on the principle of Bernoulli's equation, which states that the pressure of a fluid decreases as its velocity increases.
One of the problems that can occur in a Venturimeter is the separation of flow at the throat. This happens when the flow velocity at the throat is too high, causing the fluid to separate from the walls of the Venturimeter and form eddies. This can lead to inaccurate measurements.
To avoid this problem, the ratio of the diameter at the throat to the diameter of the pipe should be in the range of 1/3 to 1/2. This means that the throat diameter should be between one-third and one-half of the pipe diameter.
The reason for this is that a larger throat diameter will result in a lower velocity at the throat, reducing the tendency for flow separation. However, if the throat diameter is too large, the pressure drop across the Venturimeter will be too small, leading to less accurate measurements.
On the other hand, a smaller throat diameter will result in a higher velocity at the throat, increasing the tendency for flow separation. This can also lead to inaccurate measurements.
Therefore, a throat diameter in the range of 1/3 to 1/2 of the pipe diameter is optimal for accurate and reliable measurements using a Venturimeter.
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To avoid the tendency of separation of flow at the throat in a Venturimeter, the ratio of the diameter at the throat to the diameter of the pipe should bea)1/16 to 1/8b)1/8 to 1/4c)1/4 to 1/3d)1/3 to 1/2Correct answer is option 'D'. Can you explain this answer?
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