Mechanical Engineering Exam > Mechanical Engineering Questions > Boundary layer separation is caused bya)adver...
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Boundary layer separation is caused by
- a)adverse pressure gradient
- b)laminar flow changing to turbulent flow
- c)reduction in pressure to vapour pressure
- d)none of these
Correct answer is option 'A'. Can you explain this answer?
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Boundary layer separation is caused bya)adverse pressure gradientb)lam...
Boundary layer separation is caused due to adverse pressure gradient or positive pressure gradient.
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Boundary layer separation is caused bya)adverse pressure gradientb)lam...
As the pressure gradient changes from Negative to Positive... Condition for back flow arise... which causes separation of flow.
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Boundary layer separation is caused bya)adverse pressure gradientb)lam...
Boundary layer separation is primarily caused by an adverse pressure gradient along the surface of the object.
Adverse pressure gradient:
- When the pressure of the fluid flowing over an object increases in the direction of flow, it creates an adverse pressure gradient.
- This adverse pressure gradient causes the velocity of the fluid to decrease, leading to an increased boundary layer thickness.
- As the boundary layer grows thicker, it may eventually separate from the surface, causing boundary layer separation.
Laminar flow changing to turbulent flow:
- While the transition from laminar to turbulent flow can contribute to boundary layer separation, it is not the primary cause.
- Laminar flow tends to adhere to the surface of the object, while turbulent flow can be more prone to separation.
Reduction in pressure to vapour pressure:
- This phenomenon can lead to cavitation, where vapor bubbles form in the fluid due to low pressure.
- While cavitation can affect the flow characteristics, it is not the main cause of boundary layer separation.
In conclusion, adverse pressure gradient is the main factor causing boundary layer separation. It is essential to manage and control the pressure distribution along the surface to prevent separation and maintain efficient flow over the object.
Adverse pressure gradient:
- When the pressure of the fluid flowing over an object increases in the direction of flow, it creates an adverse pressure gradient.
- This adverse pressure gradient causes the velocity of the fluid to decrease, leading to an increased boundary layer thickness.
- As the boundary layer grows thicker, it may eventually separate from the surface, causing boundary layer separation.
Laminar flow changing to turbulent flow:
- While the transition from laminar to turbulent flow can contribute to boundary layer separation, it is not the primary cause.
- Laminar flow tends to adhere to the surface of the object, while turbulent flow can be more prone to separation.
Reduction in pressure to vapour pressure:
- This phenomenon can lead to cavitation, where vapor bubbles form in the fluid due to low pressure.
- While cavitation can affect the flow characteristics, it is not the main cause of boundary layer separation.
In conclusion, adverse pressure gradient is the main factor causing boundary layer separation. It is essential to manage and control the pressure distribution along the surface to prevent separation and maintain efficient flow over the object.
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Boundary layer separation is caused bya)adverse pressure gradientb)laminar flow changing to turbulent flowc)reduction in pressure to vapour pressured)none of theseCorrect answer is option 'A'. Can you explain this answer?
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