Mechanical Engineering Exam > Mechanical Engineering Questions > In the laminar flow of air (Pr = 0.7) over a ...
Start Learning for Free
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then
[2015]
- a)δ = δT
- b)δ > δT
- c)δ < δT
- d)δ = 0 but δT = 0
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ ...
When
Most Upvoted Answer
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ ...
The Prandtl number (Pr) is 0.7, it means that the ratio of momentum diffusivity to thermal diffusivity is 0.7. In laminar flow, the fluid flows smoothly in parallel layers, with no mixing between the layers.
If the air flows over a heated plate, it means that the plate is at a higher temperature than the surrounding air. This temperature difference creates a thermal gradient, which leads to heat transfer from the plate to the air.
Since the Prandtl number is less than 1 (Pr < 1),="" it="" indicates="" that="" the="" fluid="" (air)="" has="" a="" higher="" thermal="" diffusivity="" compared="" to="" its="" momentum="" diffusivity.="" this="" implies="" that="" heat="" is="" transferred="" more="" readily="" than="" momentum="" in="" the="" />
In the case of laminar flow over a heated plate, the air near the plate will be heated, causing it to expand and rise. This creates a natural convection current, where hot air rises and cooler air replaces it. This convection current enhances the heat transfer from the plate to the air.
Overall, in laminar flow with a low Prandtl number over a heated plate, heat transfer is more dominant compared to momentum transfer.
If the air flows over a heated plate, it means that the plate is at a higher temperature than the surrounding air. This temperature difference creates a thermal gradient, which leads to heat transfer from the plate to the air.
Since the Prandtl number is less than 1 (Pr < 1),="" it="" indicates="" that="" the="" fluid="" (air)="" has="" a="" higher="" thermal="" diffusivity="" compared="" to="" its="" momentum="" diffusivity.="" this="" implies="" that="" heat="" is="" transferred="" more="" readily="" than="" momentum="" in="" the="" />
In the case of laminar flow over a heated plate, the air near the plate will be heated, causing it to expand and rise. This creates a natural convection current, where hot air rises and cooler air replaces it. This convection current enhances the heat transfer from the plate to the air.
Overall, in laminar flow with a low Prandtl number over a heated plate, heat transfer is more dominant compared to momentum transfer.
Free Test
FREE
| Start Free Test |
Community Answer
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ ...
When
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
|
Explore Courses for Mechanical Engineering exam
|
|
Similar Mechanical Engineering Doubts
Top Courses for Mechanical EngineeringView all
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer?
Question Description
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. 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 In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. 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 In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer?.
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. 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 In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. 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 In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer?.
Solutions for In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer?, a detailed solution for In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice In the laminar flow of air (Pr = 0.7) over a heated plate, if δ and δT denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then[2015]a)δ = δTb)δ > δTc)δ < δTd)δ = 0 but δT = 0Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
|
|
Explore Courses for Mechanical Engineering exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup