Properties of Fluid, Application

1. SanjivaniRuralEducationSociety’s
SanjivaniCollegeof Engineering,Kopargaon,423603.
AnAutonomousInstituteAffiliatedtoSavitribaiPhulePuneUniversity,Pune
Subject:FluidMechanicsT.Y
.B.T
ech(CIVIL)
Unit-I:(A)FluidProperties
By
Prof.V.M.Mahajan(AssistantProfessor) DepartmentofCivil
Engineering
SanjivaniCollegeofEngineering,Kopargaon-423603

2. Contents
 Introduction to fluid mechanics,
 Scope and importance,
 Fluid as a continuum,
 Physical properties of fluids,
 Newton‘s law of viscosity,
 Classification of fluids,
 Rheological diagram.

3. IntroductiontoFluidMechanics
Accordingtothemolecularspacing,mattermaybeclassifiedas
1. Solids– molecularspacingisalmostzero
2. Fluids
a) Liquids–molecularspacingislargerthanSolids
b) Gases–molecularspacingislargerthanLiquids
WhatisFluid?
AFluidisasubstancethatdeformscontinuouslyinthefaceof tangentialor
shearstress,irrespectiveofthemagnitudeofshearstress.
Thiscontinuousdeformationundertheapplicationofshear stress.

4. Fluidmaybedefinedasasubstancewhichiscapableofflowing.
Ithasnodefiniteshapeofitsownbutoccupy/conformstotheshapeofthe containingvessel.
Further even small amount of shear force exerted on afluid will causeit to undergo a
deformationwhichcontinuesaslongasforcecontinuestoapply
Distinctionbetweenasolidandafluidismadeonthebasisofthesubstance’s abilitytoresistan
appliedshear(ortangential)stressthattendstochangeits shape.
Asolidcanresistanappliedshearstressbydeforming,whereasafluiddeforms
continuouslyundertheinfluenceofshearstress,nomatterhowsmall.
Insolidsstressisproportionaltostrain, butinfluidsstressisproportionalto strain rate. When
aconstantshearforceisapplied,asolideventuallystops deforming,atsomefixedstrainangle,
whereasafluidneverstopsdeformingand approachesacertainrateofstrain.
Whatis Fluid?

5. Whatis Fluid?
 Distinctionbetweensolidandfluid?
 Solid:canresistanappliedshearbydeforming.Stressisproportionalto strain
 Fluid:deformscontinuouslyunderappliedshear
.Stressisproportionalto strainrate

6. Fluid : - Tendency to flow
Ideal Fluids
(Viscosity,
Surface Tension
& it is
incompressible)
Real Fluids
(Viscosity, Surface
Tension and
possess
Compressibility)

7. Difference between Slid, Liquid andGas

8. Fluid Mechanics : - Branch of science that deals
with behaviour of fluid at rest as well as in
motion.
Fluid Statics
(Study of fluids
at rest)
Fluid
Kinematics
(Study of fluids
in motion
without
considering the
forces causing
the motion)
Fluid
Dynamics
(Study of fluids
in motion with
consideration of
the forces
causing the
motion)

9. IntroductiontoFluidMechanics

11. Thank You