Classical Properties of Matter - Viscosity

Graduation-level Study - Physics

This book is intended for being used as a textbook or reference book at the level of first-year graduation-level Physics or engineering. The objective is to provide a set of comprehensive materials that would help the student to grasp the concepts. The prerequisite for this book is pre-university Mathematics and Physics.

Table Of Contents

Introduction to Viscosity
Generally, fluid is the substance that has the ability to flow. Fluid can also be defined as the substance which is unable to resist shearing stress permanently.
Last updated on: Sep 2, 2021
Newton’s Law of Viscous Force
According to Newton’s law of viscous force, a frictional force called viscous dray or viscous force balances the applied stress or pressure so that the liquid layers attain constant velocities, and it is proportional to velocity gradient.
Last updated on: Sep 2, 2021
Critical Velocity
The streamline flow occurs in case of liquid, as long as its velocity does not exceed a limiting value. Osborne Reynolds saw that there are two limiting values instead of one. These two limiting values are known as critical velocity.
Last updated on: Sep 2, 2021
Poiseuille’s Formula for Viscous Flow
Poiseuille calculated the coefficient of viscosity of a liquid flowing through a long harrow tube with two known quantities: amount of liquid flowing per second (unit time) and pressure difference between the two ends of the tube.
Last updated on: Sep 2, 2021