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Work in Fluid Systems

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

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  1. Work in Fluid Systems Chapter 2.2 Principles of Technology I Edinburg North High School

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

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