CH E243 Chapter Notes - Chapter 5: Joule, Former State Routes In Pennsylvania, Mass Flow Rate
Document Summary
Conservation of mass relation for control volumes. Flow work and energy of fluid streams. Apply energy balance to systems that involve steady-flow processes. It turns out that mass m and energy e can be converted to each other according to the formula: E = mc2 where c is the speed of light in a vacuum this eq"n suggests there is equivalence b/w mass and energy. For closed systems, the conservation of mass principle is implicitly used by requiring the mass of the system remain constant during a process. For control volumes, mass can cross the boundaries, so we must keep track of the amount of mass entering and leaving the control volume. Mass flow rate: the amount of mass flowing through a cross section per unit time, A fluid flows into or out of a control volume through pipes or ducts. The mass flow rate through the entire cross-sectional area of a pipe or duct is obtained by integration: