# Chapter 6: Momentum Analysis

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1 6-1 Introduction 6-2Newton s Law and Conservation of Momentum 6-3 Choosing a Control Volume 6-4 Forces Acting on a Control Volume 6-5Linear Momentum Equation 6-6 Angular Momentum 6-7 The Second Law of Thermodynamics

2 6-1 Introduction Fluid flow problems can be analyzed using one of three basic approaches: differential, i experimental, and integral (or control volume). In Chap. 5, control volume forms of the mass and energy equation were developed and used. In this chapter, we complete control volume analysis by presenting the integral momentum equation. Review Newton's laws and conservation relations for momentum. Use RTT to develop linear and angular momentum equations for control volumes. Use these equations to determine forces and torques acting on the CV. 6-1

3 6-2 Newton s Laws and Conservation of Momentum (1) Newton s laws are relations between motions of bodies and the forces acting on them. First law: a body at rest remains at rest, and a body in motion remains in motion at the same velocity in a straight path when the net force acting on it is zero. Second law: the acceleration of a body is proportional to the net force acting on it and is inversely proportional to its mass. Third law: when a body exerts a force on a second body, the second body exerts an equal and opposite force on the first. 6-2

4 6-3 Choosing a Control Volume CV is arbitrarily chosen by fluid dynamicist, however, selection of CV can either simplify or complicate analysis. Clearly define all boundaries. Analysis is often simplified if CS is normal to flow direction. Clearly identify all fluxes crossing the CS. Clearly identify forces and torques of interest acting on the CV and CS. Fixed, moving, and deforming control volumes. For moving CV, use relative velocity, For deforming CV, use relative velocity all deforming control surfaces, 6-3

5 6-4 Forces Acting on a CV (1) Forces acting on CV consist of body forces that act throughout the entire body of the CV (such as gravity, electric, and magnetic forces) and surface forces that act on the control surface (such as pressure and viscous forces, and reaction forces at points of contact). Body forces act on each volumetric portion dv of the CV. Surface forces act on each portion da of the CS. 6-4

6 6-4 Forces Acting on a CV (2) Body Forces The most common body force is gravity, which exerts a downward force on every differential element of the CV The different body force Typical convention is that acts in the negative z-direction, Total body force acting on CV 6-5

7 6-4 Forces Acting on a CV (3) Surface Forces Surface forces are not as simple to analyze since they include both normal and tangential components Diagonal components σ xx,, σ yy,, σ zz are called normal stresses and are due to pressure and viscous stresses Off-diagonal components σ xy, σ xz, etc., are called shear stresses and are due solely to viscous stresses Total surface force acting on CS 6-6

8 6-4 Forces Acting on a CV (4) Surface integrals are cumbersome. Careful selection of CV allows expression of total force in terms of more readily available quantities like weight, pressure, and reaction forces. Goal is to choose CV to expose only the forces to be determined and a minimum number of other forces. 6-7

9 6-5 Linear Momentum Equation (1) Newton s second law for a system of mass m subjected to a force F is expressed as Use RTT with b = V and B = mv to shift from system formulation of the control volume formulation 6-8

10 6-5 Linear Momentum Equation (2) Steady Flow Average velocities Approximate momentum flow rate To account for error, use momentum-flux correction factor β 6-9

11 6-5 Linear Momentum Equation (3) 6-10

12 6-6 Angular Momentum (1) Motion of a rigid body can be considered to be the combination of the translational motion of its center of mass (U x, U y, U z ) the rotational ti motion about its center of mass ( (ω x, ω y, ω z ) Translational motion can be analyzed with linear momentum equation. Rotational motion is analyzed with angular momentum equation. Together, the body motion can be described as a 6 degree of freedom freedom (6DOF) system. 6-11

13 6-6 Angular Momentum (2) Angular velocity ω is the angular distance θ traveled per unit time, and angular acceleration α is the rate of change of angular velocity. 6-12

14 6-6 Angular Momentum (3) 6-13

15 6-6 Angular Momentum (4) 6-14

16 6-6 Angular Momentum (5) Moment of a force: Moment of momentum: For a system: Therefore, the angular momentum equation can be written as: To derive angular momentum for a CV, use RTT with and 6-15

17 6-6 Angular Momentum (6) General form Approximate form using average properties at inlets and outlets Steady flow 6-16

18 6-6 Angular Momentum (7) 6-17

19 6-7 The Second Law of Thermodynamics 6-18

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