Viscoelastic Behavior

Viscoelastic Behavior

When a force is applied to a viscous fluid, it will start to deform and this deformation is proportional with the magnitude of force applied. It deforms continuously until the force is removed so that it cannot return to its original position. Viscous fluids generally exhibit viscosity while solids exhibit elasticity. Some foods show both viscous and elastic properties which are known as viscoelastic materials. The typical food example for viscoelastic fluids is wheat flour dough. Dairy cream,...

Dough Testing Instruments

Extensogram

Knowledge of dough rheology will give information about the final product quality. The instruments to investigate dough behavior are the farinograph, mixograph, extensograph, and alveograph. These instruments measure power input during dough development caused by either mixing action or extensional deformation. Both the farinograph and the mixograph are torque measuring devices that provide empirical information about mixing properties of flour by recording resistance of dough to mixing. These...