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Which one of the following is correct?
In the flow past bluff bodies
In the flow past bluff bodies
- a)Pressure drag is smaller than friction drag
- b)Friction drag occupies the major part of total drag
- c)Pressure drag occupies the major part of total drag
- d)Pressure drag is less than that of streamlined body
Correct answer is option 'C'. Can you explain this answer?
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Which one of the following is correct?In the flow past bluff bodiesa)P...
Ans. (c) In the flow past bluff bodies the pressure drag occupies the major part of
total drag. During flow past bluff-bodies, the desired pressure recovery does not take place in a separated flow and the situation gives rise to pressure drag or form drag.
total drag. During flow past bluff-bodies, the desired pressure recovery does not take place in a separated flow and the situation gives rise to pressure drag or form drag.
Most Upvoted Answer
Which one of the following is correct?In the flow past bluff bodiesa)P...
Pressure drag is the major part of the total drag in the flow past bluff bodies.
Explanation:
Bluff bodies are objects with a blunt or rounded shape that are placed in a fluid flow. Examples of bluff bodies include cylinders, spheres, and cubes. When a fluid flows past a bluff body, it creates drag, which is the resistance force experienced by the body.
There are two types of drag that contribute to the total drag on a bluff body: friction drag and pressure drag.
Friction drag is caused by the shear forces between the flowing fluid and the surface of the body. It is directly proportional to the surface area of the body and the frictional resistance of the fluid. Friction drag is significant for streamlined bodies, which have a smooth and streamlined shape that allows for the flow to remain attached to the surface for longer distances, reducing the separation and turbulence. However, for bluff bodies, the flow detaches from the surface at a much earlier stage, leading to a smaller contribution of friction drag to the total drag. Therefore, option 'b' is incorrect.
Pressure drag, on the other hand, is caused by the pressure differences between the upstream and downstream sides of the body. As the fluid flows past the bluff body, it creates a region of low pressure on the upstream side and a region of high pressure on the downstream side. This pressure difference creates a net force that opposes the motion of the body. Pressure drag is significant for bluff bodies as the flow separation and turbulence result in larger pressure differences and a substantial contribution to the total drag. Therefore, option 'c' is correct.
Option 'a' is incorrect because, in general, pressure drag is larger than friction drag for bluff bodies.
Option 'd' is also incorrect because comparing the pressure drag of a bluff body to that of a streamlined body is not provided in the question.
Explanation:
Bluff bodies are objects with a blunt or rounded shape that are placed in a fluid flow. Examples of bluff bodies include cylinders, spheres, and cubes. When a fluid flows past a bluff body, it creates drag, which is the resistance force experienced by the body.
There are two types of drag that contribute to the total drag on a bluff body: friction drag and pressure drag.
Friction drag is caused by the shear forces between the flowing fluid and the surface of the body. It is directly proportional to the surface area of the body and the frictional resistance of the fluid. Friction drag is significant for streamlined bodies, which have a smooth and streamlined shape that allows for the flow to remain attached to the surface for longer distances, reducing the separation and turbulence. However, for bluff bodies, the flow detaches from the surface at a much earlier stage, leading to a smaller contribution of friction drag to the total drag. Therefore, option 'b' is incorrect.
Pressure drag, on the other hand, is caused by the pressure differences between the upstream and downstream sides of the body. As the fluid flows past the bluff body, it creates a region of low pressure on the upstream side and a region of high pressure on the downstream side. This pressure difference creates a net force that opposes the motion of the body. Pressure drag is significant for bluff bodies as the flow separation and turbulence result in larger pressure differences and a substantial contribution to the total drag. Therefore, option 'c' is correct.
Option 'a' is incorrect because, in general, pressure drag is larger than friction drag for bluff bodies.
Option 'd' is also incorrect because comparing the pressure drag of a bluff body to that of a streamlined body is not provided in the question.
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Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer?
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Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer?.
Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer?.
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Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Which one of the following is correct?In the flow past bluff bodiesa)Pressure drag is smaller than friction dragb)Friction drag occupies the major part of total dragc)Pressure drag occupies the major part of total dragd)Pressure drag is less than that of streamlined bodyCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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