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A rotational viscometer containing a non-Newtonian fluid gives a dial reading of 14 at a rotor speed of 300 rpm and a dial reading of 24 at a rotor speed of 600 rpm. Which of the following is the correct rheological model of this fluid considering the Bingham model?

A rotational viscometer containing a non-Newtonian fluid gives a dial reading of 14 at a rotor speed of 300 rpm and a dial reading of 24 at a rotor speed of 600 rpm. Which of the following is the correct rheological model of this fluid considering the Bingham model? Correct Answer μp =10 cp, τy=4 lbf/100 ft2

The Plastic Viscosity can be calculated by using the formula μp= θ600– θ300, here μp =24-14=10 cp and the yield stress can be calculated by using, τy= θ300– μp =14-10= 4 lbf/100 ft2.

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