Chemical Engineering - Heat Transfer - Discussion
Discussion Forum : Heat Transfer - Section 3 (Q.No. 35)
35.
A hot body will radiate heat most rapidly, if its surface is
Discussion:
10 comments Page 1 of 1.
PRASURJYA DAS said:
1 year ago
A black body absorbs maximum heat and hence radiates maximum heat.
If the surface is polished, then the heat gets reflected back and the absorption of heat is very less. Hence a black, non-shiny or rough body would radiate maximum heat.
If the surface is polished, then the heat gets reflected back and the absorption of heat is very less. Hence a black, non-shiny or rough body would radiate maximum heat.
Goutham said:
3 years ago
The Correct option is C.
Radiation heat transfer increases with an increase in surface area and emissivity.
Black bodies have the highest emissivity (equal to 1) and rough surfaces have higher surface area than polished surfaces. So, black and rough surfaces emit radiations more rapidly.
Radiation heat transfer increases with an increase in surface area and emissivity.
Black bodies have the highest emissivity (equal to 1) and rough surfaces have higher surface area than polished surfaces. So, black and rough surfaces emit radiations more rapidly.
(1)
Sur Jeet Singh said:
4 years ago
@Alpesh Solanki.
Your answer is correct, It is black and rough.
Your answer is correct, It is black and rough.
(1)
Alpesh Solanki said:
5 years ago
Question is that radiate heat not reflect the heat.
So the answer is correct black & the rough body has high absorbed heat then polished one or white.
So the answer is correct black & the rough body has high absorbed heat then polished one or white.
Anooj pillai said:
5 years ago
Answer C is correct. I too agree.
Shekhar singh said:
5 years ago
@Uday.
How? Please explain.
How? Please explain.
Uday kanisetti said:
5 years ago
I think A is correct answer.
Ashim said:
7 years ago
I also agree with option C.
Tanmay Shah said:
7 years ago
Yes, I also agree with Option C.
Ashish patel said:
7 years ago
How?
As we know the reflectivity doesn't like emissivity. So, in white & polished body it should be highest. And therefore answer must be C.
As we know the reflectivity doesn't like emissivity. So, in white & polished body it should be highest. And therefore answer must be C.
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