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In thick film hydrodynamic journal bearings, the coefficient of friction
- a)Increases with increases in load
- b)is independent of load
- c)Decreases with increase in load
- d)may increase or decrease with increase in load
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
In thick film hydrodynamic journal bearings, the coefficient of fricti...
Explanation:
Thick film hydrodynamic journal bearings are used to support rotating shafts in various mechanical systems. These bearings work on the principle of hydrodynamic lubrication, where a thin film of lubricant is formed between the journal and the bearing surface due to the relative motion between them.
Coefficient of friction is a measure of the resistance to sliding between two surfaces in contact. In hydrodynamic journal bearings, the coefficient of friction is influenced by various factors such as load, speed, viscosity of the lubricant, surface roughness, and the geometry of the bearing.
Effect of Load on Coefficient of Friction:
- As the load on the bearing increases, the pressure on the lubricant film also increases. This causes the thickness of the lubricant film to decrease, which in turn increases the contact area between the journal and the bearing surface.
- Due to the increased contact area, the shearing forces acting on the lubricant also increase. This leads to an increase in the frictional resistance between the two surfaces, resulting in an increase in the coefficient of friction.
However, this effect is only observed up to a certain limit. Beyond this limit, the thickness of the lubricant film becomes too thin to support the load and the bearing enters into a mixed or boundary lubrication regime. In this regime, the coefficient of friction may increase or decrease depending on the lubricant properties and the surface roughness of the bearing.
Therefore, the correct option is C) Decreases with increase in load, up to a certain limit.
Conclusion:
In thick film hydrodynamic journal bearings, the coefficient of friction initially decreases with an increase in load due to the formation of a thicker lubricant film. However, beyond a certain limit, the lubricant film becomes too thin to support the load and the bearing enters into a mixed or boundary lubrication regime, where the coefficient of friction may increase or decrease depending on various factors.
Thick film hydrodynamic journal bearings are used to support rotating shafts in various mechanical systems. These bearings work on the principle of hydrodynamic lubrication, where a thin film of lubricant is formed between the journal and the bearing surface due to the relative motion between them.
Coefficient of friction is a measure of the resistance to sliding between two surfaces in contact. In hydrodynamic journal bearings, the coefficient of friction is influenced by various factors such as load, speed, viscosity of the lubricant, surface roughness, and the geometry of the bearing.
Effect of Load on Coefficient of Friction:
- As the load on the bearing increases, the pressure on the lubricant film also increases. This causes the thickness of the lubricant film to decrease, which in turn increases the contact area between the journal and the bearing surface.
- Due to the increased contact area, the shearing forces acting on the lubricant also increase. This leads to an increase in the frictional resistance between the two surfaces, resulting in an increase in the coefficient of friction.
However, this effect is only observed up to a certain limit. Beyond this limit, the thickness of the lubricant film becomes too thin to support the load and the bearing enters into a mixed or boundary lubrication regime. In this regime, the coefficient of friction may increase or decrease depending on the lubricant properties and the surface roughness of the bearing.
Therefore, the correct option is C) Decreases with increase in load, up to a certain limit.
Conclusion:
In thick film hydrodynamic journal bearings, the coefficient of friction initially decreases with an increase in load due to the formation of a thicker lubricant film. However, beyond a certain limit, the lubricant film becomes too thin to support the load and the bearing enters into a mixed or boundary lubrication regime, where the coefficient of friction may increase or decrease depending on various factors.
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Community Answer
In thick film hydrodynamic journal bearings, the coefficient of fricti...
Cof is directly proportional to zn/p
I.e inversely proportional to p or W load
I.e inversely proportional to p or W load
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In thick film hydrodynamic journal bearings, the coefficient of friction a)Increases with increases in loadb)is independent of load c)Decreases with increase in loadd)may increase or decrease with increase in loadCorrect answer is option 'C'. Can you explain this answer?
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