Hysteresis in the Flow Curves of Pseudoplastic Semiliquid Foods
Hysteresis in the Flow Curves of Pseudoplastic Semiliquid Foods
Shearing a pseudoplastic semiliquid food, such as fruit juice concentrate or nectar, in a viscometer frequently disrupts its microstructure. Consequently, the flow curve recorded by first raising and then lowering the shear rate exhibits a hysteresis loop. The loop's area represents the energy dissipated in the shearing process in terms of power per unit volume. This Demonstration shows the phenomenon in simulated flow curves accompanied by the calculated hysteresis area.