Non-Newtonian Systems: Three Classes and Rheograms

A plot of shear rate as a function of shear stress

An indication of the force needed to convert the system into a Newtonian system

Mobility

<p>Plastic viscosity</p> Signup and view all the answers

<p>Pseudoplastic flow</p> Signup and view all the answers

<p>Resistance to flow increases</p> Signup and view all the answers

<p>Dilatant</p> Signup and view all the answers

<p>The bulk of the system expands (dilates) and the particles take an open form of packing.</p> Signup and view all the answers

<p>Corn starch in water</p> Signup and view all the answers

<p>Appropriate precautions should be used to avoid solidification under high-speed mixing conditions.</p> Signup and view all the answers

<p>Thixotropy</p> Signup and view all the answers

<p>The poise</p> Signup and view all the answers

<p>At rest, its rigidity is like a gel. As shear is applied, the structure breaks and undergoes a gel-to-sol transformation.</p> Signup and view all the answers

<p>Fluidity is the reciprocal of viscosity (Ø = 1/η).</p> Signup and view all the answers

<p>Kinematic viscosity is the absolute viscosity divided by the density of liquid at a specified temperature (η = ρ).</p> Signup and view all the answers

<p>Viscosity decreases as temperature increases.</p> Signup and view all the answers

<p>Colloids, emulsions, liquid suspensions, and ointments.</p> Signup and view all the answers

<p>Non-Newtonian fluids have a variable relationship between shear stress and shear rate, unlike Newtonian fluids.</p> Signup and view all the answers