FLUID MECHANICS AND MACHINERY

Department of Mechanical Engineering Department

INTRODUCTION

Why do swimmers float better in the ocean than in a lake?

Which is denser, Earth or the sun?

•Properties of fluids •Vapour pressure and gas laws •Capillarity and surface tension •continuity equation •Energy equation

FLOW THROUGH CIRCULAR CONDUITS

Laminar flow through circular conduits and circular annuli

Boundary layer concepts

Hydraulic and energy gradient

Friction factor and Moody diagram

Flow though pipes in series and in parallel

• Calculate frictional losses for laminar and turbulent flow through circular and non-circular pipes

• Define the friction factor in terms of flow properties

• Calculate the friction factor for laminar and turbulent flow

• Define and calculate the Reynolds number for different flow situations

• Derive the Hagen-Poiseuille equation

DIMENSIONAL ANALYSIS

Dimension and units: Buckingham’s П theorem

Discussion on dimensionless parameters

Applications of dimensionless parameters

Continuum Hypothesis

In this course, the assumption is made that the fluid behaves as a continuum, i.e., the number of molecules within the smallest region of interest (a point) are sufficient that all fluid properties are point functions (single valued at a point).

ROTO DYNAMIC MACHINES

Types

Non-Positive DisplacementFansFluid couplers

Positive DisplacementGearVane*Piston*

* Can be variable displacement, including pressure compensated and load sensing.

Thank You