Shear rate can be approximated for a liquid flowing through a cylinder,.Can one calculate the shear rate of a fluid if an object is being dragged through it?
in my case, I am 3d printing into a gel/liquid and want to determine the effect of needle size and velocity on the viscosity/shear stress of the surrounding material. Do I use the Navier-Stokes equation? Is that acceptable for a non-Newtonian fluid?
Ultimately, I'm trying to characterise the suitability of various materials as support gels looking at density, viscosity, shear thinning properties etc. I want to relate material/rheological properties to something that can be physically seen/measured.
I hope that following information will be helpful
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4545126/
Toda Gregory. Unfortunately, this is not directly useful for my work.
For the example below: http://advances.sciencemag.org/content/advances/suppl/2015/10/20/1.9.e1500758.DC1/1500758_Movie_S3.mp4
I would like to know the properties of the supporting gel near the syringe tip as it moves about.
Ariel, your problem sounds very similar to the wire coating process which has been modeled analytically by various researchers and is presented in several polymer processing textbooks. Unfortunately, a Newtonian model does not do the job when simulating the flow of the moving needle through shear thinning fluid. The good news is that solutions exist using the power-law model.
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