1 / 7

Hydraulic & Pneumatic Systems

Hydraulic & Pneumatic Systems. Pressure: Applications & Atmospheric. Atmospheric Pressure. Our atmosphere is comprised of many layers each pushing down on the ones below it. As a result, we experience atmospheric pressure Typically 101.3 kPa (101 300 Pa) at sea level.

baina
Télécharger la présentation

Hydraulic & Pneumatic Systems

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Hydraulic & Pneumatic Systems Pressure: Applications & Atmospheric

  2. Atmospheric Pressure • Our atmosphere is comprised of many layers each pushing down on the ones below it. • As a result, we experience atmospheric pressure • Typically 101.3 kPa (101 300 Pa) at sea level. • 33.76 kPa on top of Mount Everest. • 0 kPa at the edge of atmosphere. • The higher we go, the less pressure we feel.

  3. Examples of Atmospheric Pressure • Using a drinking straw: • By drawing in air at end of straw a partial vacuum is created. • The atmospheric pressure pushes fluid up the straw. • Crushing a can: • Heated water at atmospheric pressure is cooled rapidly. • Causes major pressure drop inside can • Pressure outside can >> Pressure inside can • Can is crushed.

  4. Volumetric Flow Rate • Defined as how fast the volume of a fluid is flowing past a certain point. • Given by: • Where: • qv= volumetic flow rate (m3/s or L / min) • V = Volume (m3) • ∆t = time (s) • A = cross-sectional area (m2) • v = speed (m/s)

  5. Example #1 • Water is flowing through a circular pipe of radius 2.5m. If the water is moving with a speed of 2 m/s, what is the volumetric flow rate?

  6. Example #2 • How long will it take 45 m3 of water to flow past a point in a pipe if it is flowing at 2 m3/s?

  7. Water Pressure in Industry • There are two industrial processes that use high pressure water in industry: • Hydroforming:High pressure water pushes metal against a die to shape it. • Water Jet Cutting: Water under high pressure and high speed is used to cut manufactured components. • PROS: Both processes are inexpensive and can make parts that are stronger and have more accurate geometry. • CONS: Both cost a lot to get setup, lots of cleanup after each use and water gets wasted.

More Related