What is the physical meaning of negative yield stress of bentonite suspension obtained by using Herschel Bulkley Model ?

Hafiz Mudaser Ahmad @Hafiz-Mudaser-Ahmad

26 December 2016 0 7K Report

I am performing flow sweep experiment using DHR-3 rheometer for bentonite suspensions. When the data was fitted in Herschel-Bulkley Model, It's giving negative yield stress. What does negative yield stress mean?

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