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Assertion (A): Nusselt number is always greater than unity.
Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'A'. Can you explain this answer?
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Assertion (A): Nusselt number is always greater than unity.Reason (R):...
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Assertion (A): Nusselt number is always greater than unity.Reason (R):...
Assertion (A): Nusselt number is always greater than unity.
Reason (R): Nusselt number is the ratio of two thermal resistances, one the thermal resistance which would be offered by the fluid if it was stationary and the other the thermal resistance associated with convective heat transfer coefficient at the surface.
Explanation:
The Nusselt number (Nu) is a dimensionless number used in heat transfer to quantify the ratio of convective heat transfer to conductive heat transfer. It is commonly used to analyze heat transfer in fluid flow situations.
The Nusselt number is defined as the ratio of convective heat transfer to conductive heat transfer:
Nu = hL/k
Where:
Nu = Nusselt number
h = convective heat transfer coefficient
L = characteristic length
k = thermal conductivity
Assertion (A): Nusselt number is always greater than unity.
The Nusselt number represents the enhancement of heat transfer due to convection compared to conduction. In most convective heat transfer situations, the convective heat transfer coefficient (h) is larger than the thermal conductivity (k) of the fluid. Therefore, the Nusselt number is typically greater than unity.
Reason (R): Nusselt number is the ratio of two thermal resistances, one the thermal resistance which would be offered by the fluid if it was stationary and the other the thermal resistance associated with the convective heat transfer coefficient at the surface.
The Nusselt number can also be expressed as the ratio of thermal resistances. The first thermal resistance is the resistance that the fluid would offer to heat transfer if it were stationary, represented by L/k. The second thermal resistance is the resistance associated with the convective heat transfer coefficient at the surface, represented by 1/h. Therefore, the Nusselt number can be calculated as the ratio of these two resistances:
Nu = (L/k) * (1/h)
Since L/k is usually smaller than 1/h, the Nusselt number is typically greater than unity.
Conclusion:
Both Assertion (A) and Reason (R) are individually true, and Reason (R) is the correct explanation of Assertion (A).
Reason (R): Nusselt number is the ratio of two thermal resistances, one the thermal resistance which would be offered by the fluid if it was stationary and the other the thermal resistance associated with convective heat transfer coefficient at the surface.
Explanation:
The Nusselt number (Nu) is a dimensionless number used in heat transfer to quantify the ratio of convective heat transfer to conductive heat transfer. It is commonly used to analyze heat transfer in fluid flow situations.
The Nusselt number is defined as the ratio of convective heat transfer to conductive heat transfer:
Nu = hL/k
Where:
Nu = Nusselt number
h = convective heat transfer coefficient
L = characteristic length
k = thermal conductivity
Assertion (A): Nusselt number is always greater than unity.
The Nusselt number represents the enhancement of heat transfer due to convection compared to conduction. In most convective heat transfer situations, the convective heat transfer coefficient (h) is larger than the thermal conductivity (k) of the fluid. Therefore, the Nusselt number is typically greater than unity.
Reason (R): Nusselt number is the ratio of two thermal resistances, one the thermal resistance which would be offered by the fluid if it was stationary and the other the thermal resistance associated with the convective heat transfer coefficient at the surface.
The Nusselt number can also be expressed as the ratio of thermal resistances. The first thermal resistance is the resistance that the fluid would offer to heat transfer if it were stationary, represented by L/k. The second thermal resistance is the resistance associated with the convective heat transfer coefficient at the surface, represented by 1/h. Therefore, the Nusselt number can be calculated as the ratio of these two resistances:
Nu = (L/k) * (1/h)
Since L/k is usually smaller than 1/h, the Nusselt number is typically greater than unity.
Conclusion:
Both Assertion (A) and Reason (R) are individually true, and Reason (R) is the correct explanation of Assertion (A).
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Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?
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Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?.
Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect 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 Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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ample number of questions to practice Assertion (A): Nusselt number is always greater than unity.Reason (R): Nusselt number is the ratio of two thermal resistances, onethe thermal resistance which would be offered by the fluid, if it wasstationary and the other, the thermal resistance associated with convective heat transfer coefficient at the surface.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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