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In thick film hydrodynamic journal bearings the coefficient of friction
- a)increase with increase in load
- b)is independent on load
- c)decreases with increases in load
- d)may increase of decrease with increase in load
Correct answer is option 'C'. Can you explain this answer?
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In thick film hydrodynamic journal bearings the coefficient of frictio...
Friction Coefficient in Thick Film Hydrodynamic Journal Bearings
Thick film hydrodynamic journal bearings are used in rotating machinery to provide support and reduce friction between the rotating shaft and the stationary housing. The coefficient of friction is an important parameter that determines the performance of the bearing. Here, we discuss the behavior of the coefficient of friction with respect to changes in the load.
Effect of Load on Coefficient of Friction
The coefficient of friction in thick film hydrodynamic journal bearings is not constant and varies with changes in the load. The following are the possible scenarios:
• Decrease with increase in load: In most cases, the coefficient of friction decreases with an increase in the load. This is because the increase in pressure on the lubricant film causes an increase in the thickness of the film, which reduces the shear stress and hence the friction. However, this decrease is not linear and depends on factors such as the speed, viscosity, and temperature of the lubricant.
• Increase with increase in load: In some cases, the coefficient of friction may increase with an increase in the load. This happens when the load is so high that the lubricant film is completely squeezed out, and the shaft comes in direct contact with the housing. This results in metal-to-metal contact, which causes a significant increase in friction.
• Independent of load: In rare cases, the coefficient of friction may remain constant and independent of the load. This happens when the load and the speed are within a narrow range, and the lubricant film is stable and uniform.
Conclusion
In summary, the coefficient of friction in thick film hydrodynamic journal bearings varies with changes in the load. In most cases, it decreases with an increase in the load, but in some cases, it may increase. It is important to consider the load and other operating conditions when designing and selecting journal bearings to ensure optimal performance and longevity.
Thick film hydrodynamic journal bearings are used in rotating machinery to provide support and reduce friction between the rotating shaft and the stationary housing. The coefficient of friction is an important parameter that determines the performance of the bearing. Here, we discuss the behavior of the coefficient of friction with respect to changes in the load.
Effect of Load on Coefficient of Friction
The coefficient of friction in thick film hydrodynamic journal bearings is not constant and varies with changes in the load. The following are the possible scenarios:
• Decrease with increase in load: In most cases, the coefficient of friction decreases with an increase in the load. This is because the increase in pressure on the lubricant film causes an increase in the thickness of the film, which reduces the shear stress and hence the friction. However, this decrease is not linear and depends on factors such as the speed, viscosity, and temperature of the lubricant.
• Increase with increase in load: In some cases, the coefficient of friction may increase with an increase in the load. This happens when the load is so high that the lubricant film is completely squeezed out, and the shaft comes in direct contact with the housing. This results in metal-to-metal contact, which causes a significant increase in friction.
• Independent of load: In rare cases, the coefficient of friction may remain constant and independent of the load. This happens when the load and the speed are within a narrow range, and the lubricant film is stable and uniform.
Conclusion
In summary, the coefficient of friction in thick film hydrodynamic journal bearings varies with changes in the load. In most cases, it decreases with an increase in the load, but in some cases, it may increase. It is important to consider the load and other operating conditions when designing and selecting journal bearings to ensure optimal performance and longevity.
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In thick film hydrodynamic journal bearings the coefficient of frictiona)increase with increase in loadb)is independent on loadc)decreases with increases in loadd)may increase of decrease with increase in loadCorrect answer is option 'C'. Can you explain this answer?
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