Introduction to Fluid Mechanics

1
Introduction to Fluid Mechanics

• Chapter 1
• Introduction

2
Main Topics

• Definition of a Fluid
• Basic Equations
• Methods of Analysis
• Dimensions and Units

3
Definition of a Fluid

• When a shear stress is applied
• Fluids continuously deform
• Solids deform or bend

4
Basic Equations

• We need forms of the following
• Conservation of mass
• Newtons second law of motion
• The principle of angular momentum
• The first law of thermodynamics
• The second law of thermodynamics

5
Methods of Analysis

• System(or Closed System)

• Control Volume(or Open System)

6
Dimensions and Units

• Systems of Dimensions
• M, L, t, and T
• F, L, t, and T
• F,M, L, t, and T

7
Dimensions and Units

• Systems of Units
• MLtT
• SI (kg, m, s, K)
• FLtT
• British Gravitational (lbf, ft, s, oR)
• FMLtT
• English Engineering (lbf, lbm, ft, s, oR)

8
Dimensions and Units

• Systems of Units

9
Dimensions and Units

• Preferred Systems of Units
• SI (kg, m, s, K)

• British Gravitational (lbf, ft, s, oR)