Chemical Engineering - Mass Transfer - Discussion
Discussion Forum : Mass Transfer - Section 2 (Q.No. 3)
3.
The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.
Discussion:
8 comments Page 1 of 1.
Shrutant Pradip Pawar said:
2 years ago
Option D is correct as the Schmidt Number is a ratio of momentum diffusivity and mass diffusivity, so if Sc = 1, then momentum and mass diffusivities should be the same, whereas the Prandtl number is a ratio of momentum diffusivity and heat diffusivity.
So, Pr = 1 implies heat diffusivity and momentum diffusivity are equal. So all three differences are the same in this case.
So, Pr = 1 implies heat diffusivity and momentum diffusivity are equal. So all three differences are the same in this case.
Nayan said:
6 years ago
Pr is the ratio of the momentum diffusivity to heat diffusivity and Sc is the ratio of the momentum diffusivity to the mass diffusivity.
So, When momentum diffusivity, mass diffusivity and heat diffusivity are same, Pr and Sc is equal to 1.
So, When momentum diffusivity, mass diffusivity and heat diffusivity are same, Pr and Sc is equal to 1.
Shiva sai uppala said:
7 years ago
See nu=sc * D & nu=pr*α. So both nu is same. We can equate them.
sc*D=pr*α.
As sc=pr we can cancel both but D cannot always be equal to α.
So only heat & the mass transfer is same.
sc*D=pr*α.
As sc=pr we can cancel both but D cannot always be equal to α.
So only heat & the mass transfer is same.
(2)
Shruti said:
7 years ago
why is option 4 not the answer?
We know, Sc=nu/D and Pr=nu/α
Sc=1 implies, nu=D and Pr=1 implies nu=α.
So we can conclude from above that nu=D=alpha. Which means that the mechanisms of the three processes namely, momentum, mass and heat are same.
Correct me if I am wrong.
We know, Sc=nu/D and Pr=nu/α
Sc=1 implies, nu=D and Pr=1 implies nu=α.
So we can conclude from above that nu=D=alpha. Which means that the mechanisms of the three processes namely, momentum, mass and heat are same.
Correct me if I am wrong.
Ajjju said:
8 years ago
Yes. D IS RGT
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Kashinath NA said:
9 years ago
Yes, D is the correct answer.
Abhay said:
9 years ago
Yes D is the right answer.
Acoording to law when sc=pr, mass diffusivity. Eddy moment diffusivity and thermal diffusivity is equal.
Acoording to law when sc=pr, mass diffusivity. Eddy moment diffusivity and thermal diffusivity is equal.
DURGA PRASAD M said:
9 years ago
Why is option D not an answer?
According to me, D is the correct answer.
According to me, D is the correct answer.
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