Viscosity of Fluid Mixtures: Calculating Pa.s

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To calculate the viscosity of a fluid mixture, a weighted average can be used if the fluids are well mixed. For example, combining a fluid with a viscosity of 1 Pa.s and water with a viscosity of 0.89 × 10^-3 Pa.s in a 1:9 ratio can yield a new viscosity through this method. This approach is generally acceptable for Newtonian fluids, as there are no significant deviations expected in their behavior. While some users express uncertainty about the accuracy of this method, it is considered reasonably reliable for practical applications. Understanding the principles of viscosity in mixtures is essential for experiments involving different fluid concentrations.
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Hi,
I have a question about the viscosity of fluids: If I know the viscosity of one fluid, say 1 Pa.s, and I add a portion of water (say for example 1 part water to 9 parts fluid), viscosity 0.89 × 10^-3 Pa.s, what is the viscosity of the new mixture? I have done an experiment for school where we mixed corn syrup with water in different concentrations (90%, 80%, etc) and need to work out the viscosity of each mixture.
Thanks!
 
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Is there any reason you wouldn't be able to do a weighted average? I'd imagine that, if the two fluids are well mixed, you could just use that method.
 
Thanks for the reply. I think I know what you mean. Are you sure that's an ok way to do it?
 
For Newtonian fluids I think it's fine; to be honest, I've never come across a situation where I've had to do that, but I can't think of a reason off the top of my head that it wouldn't be at least reasonably accurate.
 
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