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Hi,
I want to design S & T HE for heating application of Non Newtoniun viscous slurry. I have viscosity data available with different shear rate .
Sheat Rate, Per sec Dynamic Viscosity, cp
0 1000
10 500
50 100
100 50
Now my query is how to calculate shear rate for STHE and film type Evaporator both.
For optimization purpose, I have to use correct viscosity figur based on actual shear rate in HE unit to avoid over design.
Thaning you in advance
Sunil
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Shear Rate Calculation For Heat Exchanger /evaporator Optimization
Started by Guest_sunilchaudhari_*, Aug 31 2007 01:13 PM
2 replies to this topic
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#2
latexman
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Posted 31 August 2007 - 03:11 PM
You may want to widen your investigation of viscosity vs. shear rate to viscosity vs. shear rate vs. temperature. It depends on the rise in temperature in the heat exchanger and the viscosity-temperature sensitivity of the slurry.
A logical next step would be to fit the data collected to a rheological model, such as the power law, with a temperature correction term, possibly based on the Andrade correlation. If you are lucky, you'll end up with a single equation of viscosity = function of shear rate and temperature, which will be invaluable in sizing either type heat exchanger.
It would take more effort to explain the rest of what you need than I'm willing to give at the moment, so I am going to give you three references to get and study. They hold key information you need to size those two heat exchangers. I hope you have access to a good engineering library!
The series "Designing for Non-Newtonian Fluids" by M. H. Wohl in Chemical Engineering magazine appeared in the Jan. 15, Feb. 12, Mar. 25, Apr. 8, May 6, and June 3, 1968 issues.
A. H. P. Shelland's "Non-Newtonian Flow and Heat Transfer" by Wiley, New York, 1967.
Bird, Stewart, and Lightfoot's "Transport Phenomenon". This one is still in publication!
A logical next step would be to fit the data collected to a rheological model, such as the power law, with a temperature correction term, possibly based on the Andrade correlation. If you are lucky, you'll end up with a single equation of viscosity = function of shear rate and temperature, which will be invaluable in sizing either type heat exchanger.
It would take more effort to explain the rest of what you need than I'm willing to give at the moment, so I am going to give you three references to get and study. They hold key information you need to size those two heat exchangers. I hope you have access to a good engineering library!
The series "Designing for Non-Newtonian Fluids" by M. H. Wohl in Chemical Engineering magazine appeared in the Jan. 15, Feb. 12, Mar. 25, Apr. 8, May 6, and June 3, 1968 issues.
A. H. P. Shelland's "Non-Newtonian Flow and Heat Transfer" by Wiley, New York, 1967.
Bird, Stewart, and Lightfoot's "Transport Phenomenon". This one is still in publication!
#3
Guest_sunilchaudhari_*
Guest_sunilchaudhari_*
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- guestGuests
Posted 01 September 2007 - 05:31 AM
Thanks Mr. latexman for your detailed reply.
I have viscosity -shear rate data at different temperature but for clarity purpose only single tube wall temperature was specified. I will go through the reference given by you.
Thanks once again.
Sunil
I have viscosity -shear rate data at different temperature but for clarity purpose only single tube wall temperature was specified. I will go through the reference given by you.
Thanks once again.
Sunil
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