This document discusses properties of pure substances and phase changes. It defines a pure substance as having a fixed chemical composition and describes the three common phases as solid, liquid, and gas. Phase changes between these three states are explained, including saturated and supersaturated states. Key concepts introduced are the saturation temperature and pressure, which define conditions for phase changes. Diagrams are presented to illustrate phase equilibria, including temperature-volume, pressure-volume, and pressure-temperature diagrams. Common thermodynamic properties like latent heat and reference states are also defined. Ideal gas behavior is discussed along with limitations of the ideal gas model.
Fluid Mechanics Chapter 3. Integral relations for a control volumeAddisu Dagne Zegeye
Introduction, physical laws of fluid mechanics, the Reynolds transport theorem, Conservation of mass equation, Linear momentum equation, Angular momentum equation, Energy equation, Bernoulli equation
Topics:
1. Introduction to Fluid Dynamics
2. Surface and Body Forces
3. Equations of Motion
- Reynold’s Equation
- Navier-Stokes Equation
- Euler’s Equation
- Bernoulli’s Equation
- Bernoulli’s Equation for Real Fluid
4. Applications of Bernoulli’s Equation
5. The Momentum Equation
6. Application of Momentum Equations
- Force exerted by flowing fluid on pipe bend
- Force exerted by the nozzle on the water
7. Measurement of Flow Rate
a). Venturimeter
b). Orifice Meter
c). Pitot Tube
8. Measurement of Flow Rate in Open Channels
a) Notches
b) Weirs
Reynolds number and geometry concept, Momentum integral equations, Boundary layer equations, Flow over a flat plate, Flow over cylinder, Pipe flow, fully developed laminar pipe flow, turbulent pipe flow, Losses in pipe flow
Fluid Mechanics Chapter 3. Integral relations for a control volumeAddisu Dagne Zegeye
Introduction, physical laws of fluid mechanics, the Reynolds transport theorem, Conservation of mass equation, Linear momentum equation, Angular momentum equation, Energy equation, Bernoulli equation
Topics:
1. Introduction to Fluid Dynamics
2. Surface and Body Forces
3. Equations of Motion
- Reynold’s Equation
- Navier-Stokes Equation
- Euler’s Equation
- Bernoulli’s Equation
- Bernoulli’s Equation for Real Fluid
4. Applications of Bernoulli’s Equation
5. The Momentum Equation
6. Application of Momentum Equations
- Force exerted by flowing fluid on pipe bend
- Force exerted by the nozzle on the water
7. Measurement of Flow Rate
a). Venturimeter
b). Orifice Meter
c). Pitot Tube
8. Measurement of Flow Rate in Open Channels
a) Notches
b) Weirs
Reynolds number and geometry concept, Momentum integral equations, Boundary layer equations, Flow over a flat plate, Flow over cylinder, Pipe flow, fully developed laminar pipe flow, turbulent pipe flow, Losses in pipe flow
States of Matter and properties of matter: State of matter, changes in the state of matter, latent heats, vapour pressure, sublimation critical point, eutectic mixtures, gases, aerosols – inhalers, relative humidity, liquid complexes, liquid crystals, glassy states, solid- crystalline, amorphous & polymorphism.
Physicochemical properties of drug molecules: Refractive index, optical rotation, dielectric constant, dipole moment, dissociation constant, determinations and applications
States of Matter and properties of matter: State of matter, changes in the state of matter, latent heats, vapour pressure, sublimation critical point, eutectic mixtures, gases, aerosols – inhalers, relative humidity, liquid complexes, liquid crystals, glassy states, solid- crystalline, amorphous & polymorphism.
Physicochemical properties of drug molecules: Refractive index, optical rotation, dielectric constant, dipole moment, dissociation constant, determinations and applications
Thermodynamic Property Relations
Properties of pure substances
Maxwell Relations
P-v diagram of a pure substance
pvt surface diagram
How to read steam table using an example
Pure Substance Pure substance is a chemically homogenous s.docxamrit47
Pure Substance
Pure substance is a chemically homogenous substance and invariable in chemical
composition. The chemical composition in a pure substance is in a fixed ratio throughout
the system and does not change during any process. A fixed relationship between the
pressure and temperature of the pure substance can be determined when two phases of a
pure substance are in equilibrium. The pure substance which used in this experiment is
water. Water has a freezing point of 0
o
C and a boiling point of 100
o
C. Besides, it can
exist in three different states which are solid, liquid and gaseous states.
Steam Properties
There are several steam properties and saturation temperature is one of the steam
properties. Saturation is the condition which the mixture of liquid and vapour can exist
together at a given temperature and pressure. Saturation temperature is the equilibrium
temperature during phase change and the temperature where the evaporation or the
condensation process of the pure substance starts to occur in a given system pressure.
Besides, saturation pressure is the equilibrium pressure in a given system temperature.
Property diagram is a diagram which shows the phases of a substance and the
relationships between its properties. There are two common property diagram which are
P-V property diagram and T-V property diagram. Figure 1 below shows the T-V property
diagram which could clearly describe the property of the pure substance during phase
change in this experiment.
Figure 1: Property Diagram
Based on Figure 1, when the saturation temperature is higher than the liquid
temperature, it is fallen into the sub-cooled liquid region. The liquid in this region is
known as sub-cooled liquid or compressed liquid. Next, when the heat is continually
supplied to the liquid, the temperature of the liquid will rise gradually. The liquid will
reach saturation when it reaches the saturation temperature and it is also known as
saturated liquid. Vaporization occurs when further heat is applied and the phase of the
pure substance is starting to change. In this phase, liquid and vapour exist together and
the temperature is in equilibrium. It is known as saturated wet vapour as the vapour
fraction in the mixture is increasing. When the liquid has evaporated fully into vapour
state and the temperature is still remained at saturation temperature, it is known as dry
saturated vapour. Lastly, when the vapour temperature is higher than the saturation
temperature, it is categorized in superheated region and known as superheated vapour.
Enthalpy is one of the steam properties and it is the total sum of internal energy
plus the product of the pressure and volume as shown in the Equation 1 below.
H = U + P * V (Equation 1)
where,
H = Enthalpy (J)
U = Internal Energy (J)
P = Pressure (Pa)
V = Volume (m
3
)
The formula in Equation 1 can be expressed in term o ...
Steam tables are defined as the thermodynamic data that contain the properties of water or steam. ... Property tables list the properties from saturated water to steam
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Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
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Topics covered:
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Desktop automation flow
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Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
2. 2
PURE SUBSTANCE
• Pure substance: A substance that has a fixed chemical
composition throughout.
• Air is a mixture of several gases, but it is considered to be a
pure substance.
3. 3
PHASES OF A PURE SUBSTANCE
The molecules
in a solid are
kept at their
positions by the
large springlike
inter-molecular
forces.
In a solid, the
attractive and
repulsive forces
between the
molecules tend
to maintain them
at relatively
constant
distances from
each other.
4. 4
PHASE-CHANGE PROCESSES OF PURE
SUBSTANCES
• Compressed liquid (subcooled liquid): A substance that it is not
about to vaporize.
• Saturated liquid: A liquid that is about to vaporize.
At 1 atm and
20°C, water exists in
the liquid phase
(compressed liquid).
At 1 atm pressure
and 100°C, water
exists as a liquid
that is ready to
vaporize
(saturated liquid).
5. 5
• Saturated vapor: A vapor that is about to condense.
• Saturated liquid–vapor mixture: The state at which the liquid and
vapor phases coexist in equilibrium.
• Superheated vapor: A vapor that is not about to condense (i.e., not a
saturated vapor).
As more heat is
transferred, part of the
saturated liquid vaporizes
(saturated liquid–vapor
mixture).
At 1 atm pressure, the
temperature remains
constant at 100°C until the
last drop of liquid is vaporized
(saturated vapor).
As more heat is
transferred, the
temperature of the
vapor starts to rise
(superheated vapor).
6. 6
T-v diagram for the
heating process of
water at constant
pressure.
If the entire process between state 1 and 5 described in the figure is
reversed by cooling the water while maintaining the pressure at the
same value, the water will go back to state 1, retracing the same path,
and in so doing, the amount of heat released will exactly match the
amount of heat added during the heating process.
7. 7
Saturation Temperature and Saturation Pressure
• The temperature at which water starts boiling depends on the pressure;
therefore, if the pressure is fixed, so is the boiling temperature.
• Water boils at 100 C at 1 atm pressure.
• Saturation temperature Tsat: The temperature at which a pure substance
changes phase at a given pressure.
• Saturation pressure Psat: The pressure at which a pure substance changes
phase at a given temperature.
The liquid–vapor
saturation curve
of a pure
substance
(numerical
values are for
water).
8. 8
• Latent heat: The amount of energy
absorbed or released during a phase-
change process.
• Latent heat of fusion: The amount of
energy absorbed during melting. It is
equivalent to the amount of energy
released during freezing.
• Latent heat of vaporization: The amount
of energy absorbed during vaporization
and it is equivalent to the energy released
during condensation.
• The magnitudes of the latent heats
depend on the temperature or pressure at
which the phase change occurs.
• At 1 atm pressure, the latent heat of
fusion of water is 333.7 kJ/kg and the
latent heat of vaporization is 2256.5 kJ/kg.
• The atmospheric pressure, and thus the
boiling temperature of water, decreases
with elevation.
9. 9
Some Consequences of
Tsat and Psat Dependence
The variation of
the temperature
of fruits and
vegetables with
pressure during
vacuum cooling
from 25°C to 0°C.
In 1775, ice was made
by evacuating the air
space in a water tank.
10. 10
PROPERTY DIAGRAMS FOR PHASE-CHANGE
PROCESSES
The variations of properties during phase-change processes are best studied
and understood with the help of property diagrams such as the T-v, P-v, and P-T
diagrams for pure substances.
T-v diagram of
constant-pressure
phase-change
processes of a pure
substance at various
pressures
(numerical values
are for water).
11. 11
• saturated liquid line
• saturated vapor line
• compressed liquid region
• superheated vapor region
• saturated liquid–vapor
mixture region (wet region)
At supercritical
pressures (P >
Pcr), there is no
distinct phase-change
(boiling) process.
Critical point: The point
at which the saturated
liquid and saturated vapor
states are identical.
13. 13
Extending the
Diagrams to Include
the Solid Phase
At triple-point pressure
and temperature, a
substance exists in three
phases in equilibrium.
For water,
Ttp = 0.01°C
Ptp = 0.6117 kPa
15. 15
Sublimation:
Passing from the
solid phase directly
into the vapor phase.
At low pressures
(below the triple-point
value), solids
evaporate without
melting first
(sublimation).
P-T diagram of pure substances.
Phase Diagram
16. 16
The P-v-T surfaces present a great deal of information at once, but in a
thermodynamic analysis it is more convenient to work with two-dimensional
diagrams, such as the P-v and T-v diagrams.
17. 17
PROPERTY TABLES
• For most substances, the relationships among thermodynamic properties are too
complex to be expressed by simple equations.
• Therefore, properties are frequently presented in the form of tables.
• Some thermodynamic properties can be measured easily, but others cannot and
are calculated by using the relations between them and measurable properties.
• The results of these measurements and calculations are presented in tables in a
convenient format.
Enthalpy—A Combination Property
The
combination
u + Pv is
frequently
encountered
in the analysis
of control
volumes.
The product pressure
volume has energy units.
18. 18
Saturated Liquid and Saturated Vapor States
• Table A–4: Saturation properties of water under temperature.
• Table A–5: Saturation properties of water under pressure.
A partial list of Table A–4.
Enthalpy of vaporization, hfg (Latent
heat of vaporization): The amount of
energy needed to vaporize a unit mass
of saturated liquid at a given
temperature or pressure.
23. 23
Saturated Liquid–Vapor Mixture
Quality, x : The ratio of the mass of vapor to the total mass of the mixture.
Quality is between 0 and 1 0: sat. liquid, 1: sat. vapor.
The properties of the saturated liquid are the same whether it exists alone or in
a mixture with saturated vapor.
The relative
amounts of
liquid and
vapor phases
in a saturated
mixture are
specified by
the quality x.
A two-phase system can be
treated as a homogeneous
mixture for convenience.
Temperature and
pressure are dependent
properties for a mixture.
27. 27
Superheated VaporIn the region to the right of the
saturated vapor line and at
temperatures above the critical
point temperature, a substance
exists as superheated vapor.
In this region, temperature and
pressure are independent
properties.
A partial
listing of
Table A–6.
At a specified
P, superheated
vapor exists at
a higher h than
the saturated
vapor.
Compared to saturated
vapor, superheated vapor is
characterized by
29. 29
Compressed Liquid
Compressed liquid is characterized by
y v, u, or h
A more accurate relation for h
A compressed liquid
may be approximated
as a saturated liquid at
the given temperature.
The compressed liquid properties
depend on temperature much more
strongly than they do on pressure.
31. 31
Reference State and Reference Values
• The values of u, h, and s cannot be measured directly, and they are calculated from
measurable properties using the relations between properties.
• However, those relations give the changes in properties, not the values of properties at
specified states.
• Therefore, we need to choose a convenient reference state and assign a value of zero for
a convenient property or properties at that state.
• The reference state for water is 0.01°C and for R-134a is -40°C in tables.
• Some properties may have negative values as a result of the reference state chosen.
• Sometimes different tables list different values for some properties at the same state as a
result of using a different reference state.
• However, In thermodynamics we are concerned with the changes in properties, and the
reference state chosen is of no consequence in calculations.
34. 34
THE IDEAL-GAS EQUATION OF STATE
• Equation of state: Any equation that relates the
pressure, temperature, and specific volume of a substance.
• The simplest and best-known equation of state for substances in the gas
phase is the ideal-gas equation of state. This equation predicts the P-v-T
behavior of a gas quite accurately within some properly selected region.
R: gas constant
M: molar mass (kg/kmol)
Ru: universal gas constant
Ideal gas equation
of state
Different substances have different
gas constants.
35. 35
Properties per unit mole are
denoted with a bar on the top.
Mass = Molar mass Mole number
Various expressions
of ideal gas equation
Ideal gas equation at two
states for a fixed mass
Real gases behave as an ideal gas at low
densities (i.e., low pressure, high temperature).
37. 37
Is Water Vapor an Ideal Gas?
• At pressures below 10 kPa, water
vapor can be treated as an ideal
gas, regardless of its
temperature, with negligible error
(less than 0.1 percent).
• At higher pressures, however, the
ideal gas assumption yields
unacceptable errors, particularly in
the vicinity of the critical point and
the saturated vapor line.
• In air-conditioning applications, the
water vapor in the air can be
treated as an ideal gas. Why?
• In steam power plant
applications, however, the
pressures involved are usually very
high; therefore, ideal-gas relations
should not be used.
Percentage of error ([|vtable - videal|/vtable] 100) involved in
assuming steam to be an ideal gas, and the region where steam
can be treated as an ideal gas with less than 1 percent error.