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欧洲必威体育精装版流体力学课件第五章
Chapter 5: Mass, Bernoulli, and
Energy Equations
Introduction
This chapter deals with 3 equations
commonly used in fluid mechanics
The mass equation is an expression of the
conservation of mass principle.
The Bernoulli equation is concerned with the
conservation of kinetic, potential, and flow
energies of a fluid stream and their
conversion to each other.
The energy equation is a statement of the
conservation of energy principle.
Meccanica dei Fluidi I 2 Chapter 5: Mass, Bernoulli, and Energy Equations
Objectives
After completing this chapter, you should be able to
Apply the mass equation to balance the incoming
and outgoing flow rates in a flow system.
Recognize various forms of mechanical energy,
and work with energy conversion efficiencies.
Understand the use and limitations of the Bernoulli
equation, and apply it to solve a variety of fluid flow
problems.
Work with the energy equation expressed in terms
of heads, and use it to determine turbine power
output and pumping power requirements.
Meccanica dei Fluidi I 3 Chapter 5: Mass, Bernoulli, and Energy Equations
Conservation of Mass
Conservation of mass principle is one of the
most fundamental principles in nature.
Mass, like energy, is a conserved property, and
it cannot be created or destroyed during a
process.
For closed systems mass conservation is implicit
since the mass of the system remains constant
during a process.
For control volumes, mass can cross the
boundaries which means that we must keep
track of the amount of mass entering and leaving
the control volume.
Meccanica dei Fluidi I 4 Chapter 5: Mass, Bernoulli, and Energy Equations
Mass and Volume Flow Rates
The a
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