Mechanical and Materials Engineering 2204A/B Lecture Notes - Lecture 1: Isolated System, Internal Energy

• School: Western University
• Department: Mechanical and Materials Engineering
• Course: Mechanical and Materials Engineering 2204A/B
• Professor: Anthony Straatman

Document Summary

Enclose a region in space by dashed lines, the system is enclosed within this space called control volume. Define in writing what within boundary constitutes the system. Example: system includes all mass within the boundaries. Isolated system: nothing crosses boundaries (not energy or mass) Closed system: energy can cross the boundary but mass cannot. Open system: both mass and energy are able to cross boundary. Defining the system and its type is the first important step to solving a thermo/fluids transfer problem. Assume a system that is isolated, except for a thin massless thread that crosses the boundary (closed system) Define this as an increase in energy of the system. Because of the new position relative to the ground, there is potential to do work. Pe is defined by the amount of potential work that could be done by releasing all of the pe. Start at elevation , cut the strin gand isolate the system.