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Time constant in Herschel-Bulkley viscosity model

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Old   October 17, 2016, 04:52
Default Time constant in Herschel-Bulkley viscosity model
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I am trying to model a fluid using the Bingham model (it actually makes use of the Herschel-Bulkley-Papanastasiou model) with the AcuSolve software. As input it not requires the values of the yield shear stress, and exponential index. However, instead of also asking for the consistency index, it requires a reference viscosity and a time constant as seen in the picture attached. I have been looking for the meaning of this constant and how to determine the right reference viscosity and time constants for the model but I haven't succeeded so far. Could anyone explain this? Do I just get them from curve fitting?

Thanks in advance!

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File Type: png Bingham model constant.PNG (33.9 KB, 18 views)
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bingham fluid, non-newtonian model

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