Mechanical Engineering Exam > Mechanical Engineering Questions > Flow separation is caused bya)Reduction of pr...
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Flow separation is caused by
- a)Reduction of pressure to local vapour pressure
- b)A negative pressure gradient
- c)A positive pressure gradient
- d)Thinning of boundary layer thickness to zero
Correct answer is option 'C'. Can you explain this answer?
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Flow separation is caused bya)Reduction of pressure to local vapour pr...
Positive pressure gradient is adverse pressure gradient which causes flow separation
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Flow separation is caused bya)Reduction of pressure to local vapour pr...
Flow Separation Causes:
Flow separation in a boundary layer occurs when the pressure gradient is adverse, leading to the flow reversing direction and creating regions of recirculation.
Flow separation is caused by a positive pressure gradient, which is characterized by the pressure increasing in the direction of flow. This causes the flow to slow down, leading to separation of the boundary layer from the surface.
Effects of Positive Pressure Gradient:
- A positive pressure gradient causes the flow velocity to decrease along the flow direction.
- As the flow velocity decreases, the boundary layer thickness increases.
- Eventually, the boundary layer may become thick enough that the flow separates from the surface.
Thinning of Boundary Layer Thickness:
- If the boundary layer becomes thin enough, it may not be able to withstand the adverse pressure gradient.
- This can lead to flow separation, where the flow detaches from the surface and forms regions of recirculation and turbulence.
In conclusion, flow separation is primarily caused by a positive pressure gradient that leads to a decrease in flow velocity and an increase in boundary layer thickness. If the boundary layer becomes too thin, it may not be able to withstand the adverse pressure gradient, resulting in flow separation.
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Flow separation is caused bya)Reduction of pressure to local vapour pressureb)A negative pressure gradientc)A positive pressure gradientd)Thinning of boundary layer thickness to zeroCorrect answer is option 'C'. Can you explain this answer?
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