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Rheology vs Viscosity | Difference Between Rheology and Viscosity

The main difference between rheology and viscosity is that rheology is the study of the circulation of matter, whereas viscosity is a measure of its resistance to deformation.

Rheology is a department of physics or physical chemistry, whereas viscosity is a quantitative measurement that's helpful in chemistry. These two terms are associated with fluids resembling liquids and gases.

CONTENTS

1. Overview and Key Difference
2. What is Rheology
3. What is Viscosity
4. Side by Side Comparison – Rheology vs Viscosity in Tabular Form
5. Summary

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What's Rheology?

Rheology is the study of the stream of matter primarily in liquid and gas state. Nevertheless, this time period can be utilized relating to delicate solids or solids which can be below situations the place the solids reply to the plastic stream slightly than deformation that happens elastically as a response to a utilized pressure. This examines space is a department of physics that offers the deformation and stream of supplies relating to each solid and liquids.

Usually, rheology accounts for the behaviour of non-Newtonian fluids by characterizing the bottom variety of features required to narrate stresses with the speed of change of pressure or pressure changes. The other phenomenon or rheology is rheopecty. Some non-Newtonian fluids present rheopecty the place viscosity will increase with relative deformation, and that is named shear thickening or dilatant supplies.

Key Difference - Rheology vs Viscosity

Figure 01: Rheology of Time Independent Fluids

We can provide the rheological behaviour as an experimental characterization that's named rheometry. Nevertheless, the time period rheology is interchangeably used together with rheometry by experimentalists. Virtually, rheology includes extending continuum mechanics in an effort to characterize the stream of supplies that may exhibit a mix of elastic, viscous, and plastic behaviour by correctly combining elasticity and fluid mechanics.

What's Viscosity?

The viscosity of a fluid is the measure of its resistance in direction of deformation at a given rate. When contemplating liquids, it corresponds to the casual idea of thickness, e.g. the viscosity of syrup is increased than that of water.

We will present viscosity by quantifying the interior frictional pressure which arises between adjoining layers of fluid that happens in a relative movement.

For instance, after we are forcing a viscous fluid by a tube, it tends to stream extra shortly close to the axis of the tube in comparison with the stream close to partitions. Experimentally, in such conditions, the fluid requires some stress in an effort to maintain the stream by the tube.

Difference Between Rheology and Viscosity

Figure 02: Viscosity in a Diagram

Theoretically, we will observe zero viscosity of fluid solely at very low temperatures in superfluids. A fluid having no resistance to shear stress is a perfect fluid or an inviscid fluid. Based on the second regulation of thermodynamics, all fluids have a constructive viscosity and these fluids are normally known as viscous fluids or viscid fluids.

What's the Difference Between Rheology and Viscosity?

Rheology is a department of physics or physical chemistry. Viscosity is a quantitative measurement that's helpful in chemistry. These two phrases are associated with fluids resembling liquids and gases. The important thing distinction between rheology and viscosity is that rheology is the examination of the stream of matter whereas viscosity is a measure of its resistance to deformation. The next infographic summarizes the distinction between rheology and viscosity in a tabular kind.

Under is an abstract of the distinction between rheology and viscosity in tabular kind.

Difference-Between-Rheology-and-Viscosity-Tabular-Form

Summary – Rheology vs Viscosity

Rheology is a department of physics or bodily chemistry. Viscosity is a quantitative measurement that's helpful in chemistry. These two phrases are associated with fluids resembling liquids and gases. The important thing distinction between rheology and viscosity is that rheology is the examination of the stream of matter whereas viscosity is a measure of its resistance to deformation.

Reference:

1. “Rheology.” Wikipedia, Wikimedia Basis, 27 Mar. 2021, Available here.

Picture Courtesy:

1. “Rheology of time unbiased fluids” By g-sec – Personal work (CC BY-SA 3.0) by way of Commons Wikimedia
2. “Laminar shear” By Duk on the English-language Wikipedia (CC BY-SA 3.0) by way of Commons Wikimedia

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