Non Newtonian Pressure Drop Calculation
Non Newtonian Pressure Drop Calculation
(OP)
Hello,
I am researching how to calculate pressure drop of a non newtonian (power law) fluid when it is in the turbulent flow regime.
I read the "Facts at Your Fingertips" for Fluid Flow in Chemical Engineering magazine (December 2008) to calculate the friction factor for power law fluids. I have all of the parameters to calculate the friction factor. Now do I just calculate the pressure drop per length of pipe like usual?
h/L=(fV^2/D2g)
If not, what correlation do I use after I find the friction factor for a power law fluid in the turbulent flow range?
The equations for finding the friction factor is based off of Ron Darby's article "Take the Mystery Out of Non-Newtonian Fluids" From Chemical Engineering Magazine March 2001. I have ordered a copy of this article for future use.
Thanks in advance.
I am researching how to calculate pressure drop of a non newtonian (power law) fluid when it is in the turbulent flow regime.
I read the "Facts at Your Fingertips" for Fluid Flow in Chemical Engineering magazine (December 2008) to calculate the friction factor for power law fluids. I have all of the parameters to calculate the friction factor. Now do I just calculate the pressure drop per length of pipe like usual?
h/L=(fV^2/D2g)
If not, what correlation do I use after I find the friction factor for a power law fluid in the turbulent flow range?
The equations for finding the friction factor is based off of Ron Darby's article "Take the Mystery Out of Non-Newtonian Fluids" From Chemical Engineering Magazine March 2001. I have ordered a copy of this article for future use.
Thanks in advance.





RE: Non Newtonian Pressure Drop Calculation
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RE: Non Newtonian Pressure Drop Calculation
I have used the Darby 3K method with the power-law-model Reynolds number with success. I bought the book after seeing it endorsed in this forum in the past. I am confident that there are posts here that can help you.
You can preview the book using Google books (see page 214 of the second edition). Non-newtonian fluids will most likely be a part of my life for years to come, so I didn't mind springing for the book.
Good luck
RE: Non Newtonian Pressure Drop Calculation
The reason for the calculation is that we are changing our emergency dump piping for one of our polystyrene reactors. The piping is going to be 6" schedule 40.
I know the power law variables and the temperature and material. I was just confused when the Ron Darcy article I read just told you how to calculate the friction factor. I assumed that after that you could calculate flow from pressure drop (I have the pressure in the reactor head space and static head of the polymer melt).
Again thanks for the replies. I appreciate the help in this forum. I have done hundreds of newtonian fluid hydraulic calcs, but none with a power law fluid.
RE: Non Newtonian Pressure Drop Calculation
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.