Introduction to Fluid Mechanics
Download
1 / 18

Introduction to Fluid Mechanics - PowerPoint PPT Presentation


  • 184 Views
  • Uploaded on

Introduction to Fluid Mechanics. Bellagio Fountain. Lecture 8 Introduction to Fluid Mechanics Approximate Running Time - 21 minutes Distance Learning / Online Instructional Presentation Presented by Department of Mechanical Engineering Baylor University Procedures:

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Introduction to Fluid Mechanics' - joseph-brewer


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Introduction to fluid mechanics

  • Lecture 8

  • Introduction to Fluid Mechanics

  • Approximate Running Time - 21 minutes

  • Distance Learning / Online Instructional Presentation

  • Presented by

  • Department of Mechanical Engineering

  • Baylor University

  • Procedures:

  • Select “Slide Show” with the menu: Slide Show|View Show (F5 key), and hit “Enter”

  • You will hear “CHIMES” at the completion of the audio portion of each slide; hit the “Enter” key, or the “Page Down” key, or “Left Click”

  • You may exit the slide show at any time with the “Esc” key; and you may select and replay any slide, by navigating with the “Page Up/Down” keys, and then hitting “Shift+F5”.


Introduction to fluid mechanics

Lecture 8 Topics

  • Outline

    • Measuring Devices for Measuring Drag

    • Basics of Fluid Mechanics

    • Flight Characteristics of Baseballs & Golf Balls

Dr. Carolyn Skurla

Speaking


Lab drag force experiment
Lab: Drag Force Experiment

  • Performing a fluid mechanics experiment

    • Collect experimental data

    • Perform integration of experimental data

  • Equipment:

    • Wind tunnel

    • Cylinder

    • Pressure

      transducer

    • Pitot-static

      tube


So what is fluid mechanics
So, What is Fluid Mechanics?

  • The study of fluids in motion

    • Solid -> Can resist a shear stress by a static deformation

    • Fluid -> Cannot resist a shear stress

      • Any shear stress applied to a fluid will result in motion of that fluid

      • There are two classes of fluids:

        • Liquids

        • Gases

(White, 1994)


Thermodynamic properties of a fluid
Thermodynamic Properties of a Fluid

  • Pressure, p

    • Compression stress at a point in a fluid

    • Differences, or gradients, of pressure often drive a fluid flow

  • Temperature, T

    • Measure of internal energy level of a fluid


Thermodynamic properties of a fluid1
Thermodynamic Properties of a Fluid

  • Density, 

    • Mass per unit volume

      • Highly variable in gases (i.e.,  =f(p))

      • Nearly constant in liquids

        • Almost incompressible

        • Assumed to be imcompressible to make analysis easier

  • Specific Weight, 

    • Weight per unit volume


Pressure transducer manometer
Pressure Transducer: Manometer

  • How do we measure pressure, p ?

    • Change in elevation of a liquid is equivalent to a change in pressure

      • Therefore, a static column of liquid can be used to measure pressure difference between 2 points

(White, 1994)


Pressure transducer manometer1
Pressure Transducer: Manometer

  • Manometer units are in·H2O

    • How do I convert in·H2O to more standard units for pressure?

SI UnitsEnglish


Pressure velocity relationship

y

x

1

2

v = Flow velocity

ds

Pressure – Velocity Relationship

A


Pressure velocity relationship1

1

2

v = Flow velocity

ds

Pressure – Velocity Relationship

A


Pitot static tube
Pitot-Static Tube

Static Point

Static Pressure, (pS )

Static Velocity, (vS)

Stagnation Point

Stagnation Pressure, (p0 )

Stagnation Velocity, (v0)

Differential Pressure Transducer (Manometer)


Pitot static tubes
Pitot-Static Tubes

  • ps= Static pressure (in the moving stream)

    • Nominal air pressure in atmosphere

  • p0= Stagnation pressure

    • Air pressure in the pitot tube

  • vs= Static velocity

    • Speed of air passing the pitot tube

      • Equivalent to speed of plane through the air

  • v0= Stagnation velocity = 0



Velocity
Velocity

  • When there is friction between the fluid and the solid surface

    • No slip of the fluid at the boundary

      • Velocity = 0

    • A boundary layer forms near the solid surface

      • Shear stress is greatest adjacent to the boundary layer at the surface

(White, 1994)


Laminar vs turbulent flow
Laminar vs. Turbulent Flow

  • Laminar -> smooth and steady.

  • Turbulent -> fluctuating and agitated.


Reynolds number
Reynolds Number

  • Dimensionless parameter

    • Correlates viscous behavior of all newtonian fluids

    •  = density

    •  = viscosity

    • V = characteristic velocity of flow

    • L = length scale of flow

  • Most important parameter in fluid mechanics

    • Governs transition from laminar to turbulent flow