Why is fluid flow important in the food industry?

Nov 24, 2016

Fluid flow is basically the same as viscosity.

Explanation:

The formula for measuring viscosity is fairly simple:
viscosity = shear stress / shear rate
The result is typically expressed in centipoise (cP), which is the equivalent of 1 mPa s (millipascal second).
Shear stress is the force per unit area required to move one layer of fluid in relation to another.
Shear rate is the measure of the change in speed at which intermediate layers move with respect to one another.

Newtonian vs. Non-Newtonian Fluids
Isaac Newton, the man to discovered this formula, thought that, at a given temperature and shear stress, the viscosity of a fluid would remain constant regardless of changes to the shear rate.

He was only partly right. A few fluids, such as water and honey, do behave this way. We call these fluids Newtonian fluids. Most fluids, however, have viscosities that fluctuate depending on the shear rate. These are called Non-Newtonian fluids.
There are five types of non-Newtonian fluids: thixotropic, rheopectic, pseudoplastic, dilatant, and plastic. Different considerations are required when measuring each of these fluid types.

Who Does Viscosity Testing?
The following are examples of how viscosity measurements are used:
Food
Viscosity measurements are used in the food industry to maximize production efficiency and cost effectiveness. It affects the rate at which a product travels through a pipe, how long it takes to set or dry, and the time it takes to dispense the fluid into packaging. The production process has to be designed with the viscosity of the product in mind, making sure that pipes are angled to optimize flow, or that dispensers provide the right amount of force to induce flow, but not so much that the packaging will overfill.
Viscosity is also a characteristic of the texture of food. The product’s viscosity must be measured and monitored during production to ensure that each batch is consistent and will go through the production process efficiently.