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Work in Fluid Systems. Chapter 2.2 Principles of Technology I Edinburg North High School. Objectives. Describe how open and closed systems are different. Explain the relationship between work and pressure in a fluid system, as given by the equation, W = P   V.

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work in fluid systems

Work in Fluid Systems

Chapter 2.2

Principles of Technology I

Edinburg North High School

objectives
Objectives
  • Describe how open and closed systems are different.
  • Explain the relationship between work and pressure in a fluid system, as given by the equation, W = P V.
  • Explain the relationship between work and pressure in a fluid system, as given by the equation, W = -P V.
  • Explain what is meant by positive work and negative work in fluid systems
  • Solve work problems for fluid systems in English and SI units.
introduction
Introduction
  • As with mechanical systems, work is done in when a force moves and object through a distance.
    • But it is easier to calculate work in a fluid system using pressure (prime mover in fluid systems).
  • Pressure difference can cause a fluid to move.
open and closed fluid systems
Open and Closed Fluid Systems
  • A closed fluid system retains and recirculates a working fluid.
    • Example: Brake system in a car
  • Fluid flows through an open fluid system only one time.
    • Examples: city water systems, and irrigation systems, and a fire truck water system.
work done in fluid systems
Work Done in Fluid Systems
  • When heated, gas in cylinder expands.
    • Volume changes: V = Vf - Vi
  • Since cross-sectional area does not change, V = A  d
  • In this system, pressure does not change because the weight supported by the piston does not change.
slide6

V can be positive or negative (P is always positive).

    • W is positive, work is done on the load.
    • W is negative, work is done on the fluid.
slide7

Open fluid systems

    • Steady-flow
    • If density of fluid is constant, volume moved is V = m/
    • Equation for steady=flow process when density is constant.
    • Work is positive, the fluid does work.
    • Work is negative, work is done on the fluid.