5 Questions
Explain the concept of rheology and its components.
Rheology is a branch of science that deals with the deformation of materials or matter under the influence of stress. Its components include the flow of fluid type, semi-solid (gels), colloids, and ointments. The term 'rheo' means flow, and 'logos' means science.
What is viscosity and how is it denoted?
Viscosity is the property of a body to resist flow and is denoted by the symbol Eta (η). It is measured in units of poise in the cgs system or centipoise (cP) in the mks system.
Define Newton's law of flow and its application.
Newton's law of flow states that the shear stress between adjacent fluid layers is directly proportional to the velocity gradient in the direction of flow. It is applicable to Newtonian fluids, which have a constant viscosity.
Differentiate between flow properties and corresponding rheograms of Newtonian and non-Newtonian materials.
Newtonian materials have a linear relationship between shear stress and shear rate, resulting in a straight line rheogram. Non-Newtonian materials have variable viscosity and exhibit different flow properties, leading to non-linear rheograms.
How can specific rheologic behaviors be recognized, and what are their corresponding rheograms?
Specific rheologic behaviors can be recognized by studying the flow properties and rheograms of materials. For example, materials exhibiting shear-thinning behavior have rheograms showing a decrease in viscosity with increasing shear rate, while shear-thickening materials show an increase in viscosity with increasing shear rate.
Test your understanding of rheology and its components, including Newton's law of flow and its application. Learn to differentiate flow properties and corresponding rheograms between Newtonian and non-Newtonian materials, and recognize specific rheologic behaviors with their corresponding rheograms.
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