I think this correction is wrong or it is a printed mistake
I think this correction is wrong or it is a printed mistake
(OP)
Dear all,
I think the ESDU Correlation to get the j number in the book HEAT EXCHANGER DESIGN HANDBOOK written by T.KUPPAN (in both editions) is wrong, or maybe it is a printed mistake.
I think it should be Re^(-0.3) instead of Re^(+0.3) in this equation.
Since I cannot find more support information about this, could you please give me more information about this correlation.
I think the ESDU Correlation to get the j number in the book HEAT EXCHANGER DESIGN HANDBOOK written by T.KUPPAN (in both editions) is wrong, or maybe it is a printed mistake.
I think it should be Re^(-0.3) instead of Re^(+0.3) in this equation.
Since I cannot find more support information about this, could you please give me more information about this correlation.





RE: I think this correction is wrong or it is a printed mistake
As for the correlation itself, you'd have to look at the specific references the author used. There are probably as many correlations as there are authors.
TTFN
I can do absolutely anything. I'm an expert!
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RE: I think this correction is wrong or it is a printed mistake
Actually, I've checked several other correlations, and the Reynolds number is in the denominator, and the Nusselt number may not be very small, because j=Nu/(Re*Pr^1/3).
The thing is, I now cannot see the details of the specific reference the author used unless I buy it.
But after comparing with other similar correlations, I am now quite sure it is a printed mistake. It should be Re^(-0.3).
Thank you.
RE: I think this correction is wrong or it is a printed mistake
That's consistent with http://www.seas.upenn.edu/~meam333/correlation/Cor...
>> the second link shows Re in the denominator for calculations for packed beds, so maybe in that case, that's correct
TTFN
I can do absolutely anything. I'm an expert!
homework forum: //www.engineering.com/AskForum/aff/32.aspx
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: I think this correction is wrong or it is a printed mistake
j = Nu/(Re*Pr^(1/3))
Now Nu is a function of Re where Re has always an exponent <1. So Colburn j-factor should always decrease with Reynolds.
Carol3377, I’m quite prone to think you’re correct. Have you tried to contact the editor of the book?
RE: I think this correction is wrong or it is a printed mistake
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: I think this correction is wrong or it is a printed mistake