Chemical Engineering Exam > Chemical Engineering Questions > The heat flux in nucleate boiling varies in a...
Start Learning for Free
The heat flux in nucleate boiling varies in accordance with
- a)h f g
- b)(h f g) 0.5
- c)1/(h f g) 2
- d)(h f g) 3
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf...
Q/A = δ f h f g [(p f – p g) g/σ] 0.5 [C f d t/h f g p C s f] 3.
Most Upvoted Answer
The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf...
The heat flux in nucleate boiling is a critical parameter in the design and operation of heat exchangers and other heat transfer systems. It represents the amount of heat transferred per unit area and per unit time during the boiling process. The heat flux depends on various factors, including the properties of the fluid, the surface characteristics, and the operating conditions.
Nucleate boiling is characterized by the formation of small vapor bubbles at the surface of the heated wall. These bubbles grow and detach from the surface, carrying away heat and allowing fresh liquid to come into contact with the hot surface. The heat transfer in nucleate boiling is primarily governed by the dynamics of bubble formation, growth, and detachment.
The heat flux in nucleate boiling can be described by the following equation:
q = h_fg * (A/A_c)^m
where q is the heat flux, h_fg is the latent heat of vaporization, A is the heat transfer area, A_c is the area covered by the bubbles, and m is an exponent that depends on the bubble dynamics.
- The correct answer, option C, states that the heat flux is inversely proportional to the square of the latent heat of vaporization (1/(h_fg)^2). This means that as the latent heat of vaporization increases, the heat flux decreases. This is because a higher latent heat of vaporization indicates a higher energy requirement for bubble formation and growth, leading to a lower heat transfer rate.
- Option A, (h_fg)^b, is incorrect because it does not take into account the inverse relationship between the heat flux and the latent heat of vaporization.
- Option B, (h_fg)^0.5, is incorrect because it assumes a linear relationship between the heat flux and the latent heat of vaporization, which is not supported by experimental observations.
- Option D, (h_fg)^3, is incorrect because it assumes a cubic relationship between the heat flux and the latent heat of vaporization, which is not consistent with the physics of nucleate boiling.
In summary, the correct answer, option C, correctly represents the relationship between the heat flux in nucleate boiling and the latent heat of vaporization, indicating an inverse square relationship.
Nucleate boiling is characterized by the formation of small vapor bubbles at the surface of the heated wall. These bubbles grow and detach from the surface, carrying away heat and allowing fresh liquid to come into contact with the hot surface. The heat transfer in nucleate boiling is primarily governed by the dynamics of bubble formation, growth, and detachment.
The heat flux in nucleate boiling can be described by the following equation:
q = h_fg * (A/A_c)^m
where q is the heat flux, h_fg is the latent heat of vaporization, A is the heat transfer area, A_c is the area covered by the bubbles, and m is an exponent that depends on the bubble dynamics.
- The correct answer, option C, states that the heat flux is inversely proportional to the square of the latent heat of vaporization (1/(h_fg)^2). This means that as the latent heat of vaporization increases, the heat flux decreases. This is because a higher latent heat of vaporization indicates a higher energy requirement for bubble formation and growth, leading to a lower heat transfer rate.
- Option A, (h_fg)^b, is incorrect because it does not take into account the inverse relationship between the heat flux and the latent heat of vaporization.
- Option B, (h_fg)^0.5, is incorrect because it assumes a linear relationship between the heat flux and the latent heat of vaporization, which is not supported by experimental observations.
- Option D, (h_fg)^3, is incorrect because it assumes a cubic relationship between the heat flux and the latent heat of vaporization, which is not consistent with the physics of nucleate boiling.
In summary, the correct answer, option C, correctly represents the relationship between the heat flux in nucleate boiling and the latent heat of vaporization, indicating an inverse square relationship.
|
Explore Courses for Chemical Engineering exam
|
|
Top Courses for Chemical EngineeringView all
Question Description
The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? for Chemical Engineering 2025 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer?.
The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? for Chemical Engineering 2025 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer?.
Solutions for The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemical Engineering.
Download more important topics, notes, lectures and mock test series for Chemical Engineering Exam by signing up for free.
Here you can find the meaning of The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer?, a detailed solution for The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The heat flux in nucleate boiling varies in accordance witha)hf gb)(hf g)0.5c)1/(hf g)2d)(hf g)3Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Chemical Engineering tests.
|
|
Explore Courses for Chemical Engineering exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup