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A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?
- a)Remains unchanged
- b)Gets doubled
- c)Gets reduced to one-fourth of original value
- d)Gets reduced to half of original value
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
A journal bearing with hydrodynamic lubrication is running steadily wi...
When the load and speed is doubled, the minimum film thickness remains unchanged. Since, 
Since S remains the same even after doubling the speed as well as load and film Thickness depends on the Sommerfeld number.
Most Upvoted Answer
A journal bearing with hydrodynamic lubrication is running steadily wi...
Explanation:
Minimum film thickness is the minimum separation between the journal and the bearing surface. It is the most critical parameter in hydrodynamic lubrication as it determines the load-carrying capacity and frictional losses. When the load and speed are doubled, the following changes occur:
- Load: The load on the bearing is directly proportional to the applied load. Hence, when the load is doubled, the load on the bearing also doubles.
- Speed: The speed of the journal also affects the minimum film thickness. It is directly proportional to the speed. Hence, when the speed is doubled, the speed of the journal also doubles.
However, the minimum film thickness in a hydrodynamic bearing is mainly dependent on the viscosity of the lubricant, bearing geometry, and surface roughness. These parameters remain unchanged when the load and speed are doubled. Hence, the minimum film thickness remains unchanged.
Therefore, the correct answer is option 'A' - remains unchanged.
Summary:
- Load and speed affect the minimum film thickness in hydrodynamic lubrication.
- When load and speed are doubled, the load on the bearing and speed of the journal also double.
- However, the minimum film thickness is mainly dependent on viscosity, geometry, and surface roughness, which remain unchanged.
- Hence, the minimum film thickness remains unchanged when load and speed are doubled.
Minimum film thickness is the minimum separation between the journal and the bearing surface. It is the most critical parameter in hydrodynamic lubrication as it determines the load-carrying capacity and frictional losses. When the load and speed are doubled, the following changes occur:
- Load: The load on the bearing is directly proportional to the applied load. Hence, when the load is doubled, the load on the bearing also doubles.
- Speed: The speed of the journal also affects the minimum film thickness. It is directly proportional to the speed. Hence, when the speed is doubled, the speed of the journal also doubles.
However, the minimum film thickness in a hydrodynamic bearing is mainly dependent on the viscosity of the lubricant, bearing geometry, and surface roughness. These parameters remain unchanged when the load and speed are doubled. Hence, the minimum film thickness remains unchanged.
Therefore, the correct answer is option 'A' - remains unchanged.
Summary:
- Load and speed affect the minimum film thickness in hydrodynamic lubrication.
- When load and speed are doubled, the load on the bearing and speed of the journal also double.
- However, the minimum film thickness is mainly dependent on viscosity, geometry, and surface roughness, which remain unchanged.
- Hence, the minimum film thickness remains unchanged when load and speed are doubled.
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A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?a)Remains unchanged b)Gets doubled c)Gets reduced to one-fourth of original valued)Gets reduced to half of original valueCorrect answer is option 'A'. Can you explain this answer?
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A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?a)Remains unchanged b)Gets doubled c)Gets reduced to one-fourth of original valued)Gets reduced to half of original valueCorrect answer is option 'A'. 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 A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?a)Remains unchanged b)Gets doubled c)Gets reduced to one-fourth of original valued)Gets reduced to half of original valueCorrect answer is option 'A'. 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 A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?a)Remains unchanged b)Gets doubled c)Gets reduced to one-fourth of original valued)Gets reduced to half of original valueCorrect answer is option 'A'. Can you explain this answer?.
A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?a)Remains unchanged b)Gets doubled c)Gets reduced to one-fourth of original valued)Gets reduced to half of original valueCorrect answer is option 'A'. 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 A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?a)Remains unchanged b)Gets doubled c)Gets reduced to one-fourth of original valued)Gets reduced to half of original valueCorrect answer is option 'A'. 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 A journal bearing with hydrodynamic lubrication is running steadily with a certain amount of minimum film thickness. When the load and speed are doubled, how does the minimum film thickness vary?a)Remains unchanged b)Gets doubled c)Gets reduced to one-fourth of original valued)Gets reduced to half of original valueCorrect answer is option 'A'. Can you explain this answer?.
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