Prior knowledge - Interactions in food - Rheological properties of foods

8 important questions on Prior knowledge - Interactions in food - Rheological properties of foods

What is the symbol of stress?

σ

What is the symbol of strain?

γ

Mention 4 different types of flow

  1. Viscous flow of a Newtonian liquid
  2. Shear thinning flow and shear thickening flow
  3. Plastic flow
  4. Thixotropy
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Give an example of a food with Newtonian (viscous) behaviour?

Water, alcohol, various oils

Give an example of a food with shear rate thinning behaviour behaviour?

Milk, yoghurt

When does a product with plastic flow, starts to flow?

It behaves as a solid for small stresses. When the stress exceeds a critical value (yield stress), it will start to flow.

What is a Bingham fluid?

When the stress increases linearly with increasing shear rate, but needs a yield stress to start flowing.

Give an example of a food with plastic behaviour?

Tomato-ketchup, margarine, soft cheese, marmalade, mayonnaise.

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