Work in Fluid Systems

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# Work in Fluid Systems - PowerPoint PPT Presentation

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

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.
• 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
• 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
• 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
• 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.

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.

Open fluid systems