The document discusses the fundamental principles of fluid mechanics - conservation of mass, energy, and momentum - and how they are applied to derive equations for open channel flow. It specifically covers the continuity, energy, and momentum equations. The energy equation relates changes in energy within a control volume, while the momentum equation relates the overall forces on the control volume boundaries. The document also discusses topics like specific energy, critical flow, hydraulic jumps, and how these concepts are used to analyze channel transitions and design channel flows.
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
Classification of Hydraulic Turbines
Turbines that use water as the working fluid
for the production of power are known as
hydraulic turbines.
Main categories are impulse and reaction
turbines (based on the interaction of the
fluid on the blades)
Can further be classified on the basis of
head available at the inlet, specific speed, and
according to flow direction
1. Action of water on the runner (the rotating element of
turbine)—impulse and reaction
2. Direction of flow—tangential flow, radial flow, axial flow, and
mixed (radial + axial) flow
3. Available head—high head (H > 300 m), medium head (50 m
< H < 300 m), and low head (H < 50 m)
4. Specific speed is the speed of geometrically similar turbine
which produces unit power when operated under unit head—
low, medium, and high specific speed turbines
Heads and Efficiencies
Two types of heads as far as turbines
are concerned—gross head and net
head.
Gross head indicates the difference in
head and tail race levels.
Net head is the actual head available at
the turbine inlet and is computed as
gross head minus frictional losses in the
penstock
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
Classification of Hydraulic Turbines
Turbines that use water as the working fluid
for the production of power are known as
hydraulic turbines.
Main categories are impulse and reaction
turbines (based on the interaction of the
fluid on the blades)
Can further be classified on the basis of
head available at the inlet, specific speed, and
according to flow direction
1. Action of water on the runner (the rotating element of
turbine)—impulse and reaction
2. Direction of flow—tangential flow, radial flow, axial flow, and
mixed (radial + axial) flow
3. Available head—high head (H > 300 m), medium head (50 m
< H < 300 m), and low head (H < 50 m)
4. Specific speed is the speed of geometrically similar turbine
which produces unit power when operated under unit head—
low, medium, and high specific speed turbines
Heads and Efficiencies
Two types of heads as far as turbines
are concerned—gross head and net
head.
Gross head indicates the difference in
head and tail race levels.
Net head is the actual head available at
the turbine inlet and is computed as
gross head minus frictional losses in the
penstock
Unsteady flow:
Equation of motion for unsteady flow,
Celerity of the gravity wave,
deep and shallow water waves,
open channel positive and negative surge.
The flow of water in rivers, canals, reservoirs, lakes, pools, and free- surface flow in storm water drains, conduits, pipes , galleries, tunnels and culverts, in which the velocities change with time, is defined as unsteady flow ( non - permanent, non - stationary , or time -variable free- surface water flow).
This unsteadiness may arise naturally or may be caused by human action. Floods in rivers, water level variation in estuaries due to tidal action etc. are examples of unsteady flows occurring naturally.
Surges created in power channels, water level variation in irrigation canals due to gate operation etc. are unsteady flows caused by human action
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and TechnologyIJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Comparison of flow analysis of a sudden and gradual change of pipe diameter u...eSAT Journals
Abstract This paper describes an analytical approach to describe the areas where Pipes (used for flow of fluids) are mostly susceptible to damage and tries to visualize the flow behaviour in various geometric conditions of a pipe. Fluent software was used to plot the characteristics of the flow and gambit software was used to design the 2D model. Two phase Computational fluid dynamics calculations, using K-epsilon model were employed. This simulation gives the values of pressure and velocity contours at various sections of the pipe in which water as a media. A comparison was made with the sudden and gradual change of pipe diameter (i.e., expansion and contraction of the pipe). The numerical results were validated against experimental data from the literature and were found to be in good agreement. Index Terms: gambit, fluent software.
Unsteady flow:
Equation of motion for unsteady flow,
Celerity of the gravity wave,
deep and shallow water waves,
open channel positive and negative surge.
The flow of water in rivers, canals, reservoirs, lakes, pools, and free- surface flow in storm water drains, conduits, pipes , galleries, tunnels and culverts, in which the velocities change with time, is defined as unsteady flow ( non - permanent, non - stationary , or time -variable free- surface water flow).
This unsteadiness may arise naturally or may be caused by human action. Floods in rivers, water level variation in estuaries due to tidal action etc. are examples of unsteady flows occurring naturally.
Surges created in power channels, water level variation in irrigation canals due to gate operation etc. are unsteady flows caused by human action
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and TechnologyIJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Comparison of flow analysis of a sudden and gradual change of pipe diameter u...eSAT Journals
Abstract This paper describes an analytical approach to describe the areas where Pipes (used for flow of fluids) are mostly susceptible to damage and tries to visualize the flow behaviour in various geometric conditions of a pipe. Fluent software was used to plot the characteristics of the flow and gambit software was used to design the 2D model. Two phase Computational fluid dynamics calculations, using K-epsilon model were employed. This simulation gives the values of pressure and velocity contours at various sections of the pipe in which water as a media. A comparison was made with the sudden and gradual change of pipe diameter (i.e., expansion and contraction of the pipe). The numerical results were validated against experimental data from the literature and were found to be in good agreement. Index Terms: gambit, fluent software.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
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1. The equations which describe the flow of fluid are derived from
three fundamental laws of physics (r/ship of fluid motion):
Conservation of matter (or mass)
Conservation of energy
Conservation of momentum
Assumptions have been done with in the control volume in each
principles.
1.4. Energy & Momentum Principles in Open Channel Flow
2. A. Continuity equation
For any control volume during the small time interval dt the principle of
conservation of mass implies that the mass of flow entering the control
volume minus the mass of flow leaving the control volume equals the
change of mass within the control volume.
If the flow is steady and the fluid incompressible the mass entering is
equal to the mass leaving, so there is no change of mass within the
control volume.
3. B. Energy Equation
oConsider the forms of energy available for the above control volume. If the
fluid moves from the upstream face 1, to the downstream face 2 in time dt
over the length L.
Similarly the total energy per unit weight of section two also computed and consider no energy
is supplied between the inlet and outlet of the control volume, energy leaving equal to energy
entering.
5. C. Momentum Equation
The law of conservation of momentum says that a moving body cannot gain or
lose momentum unless acted upon by an external force.
The resultant force acting on a free body of fluid in any direction is equal to the
time rate of change of momentum in that direction
The flow may be compressible or incompressible, real (with friction) or ideal
(frictionless), steady or unsteady moreover, the equation is not only valid along a
streamline
6. Energy Equation Momentum Equation
Relates the change in energy within the
control volume
Relates the overall forces on the boundary
of the control volume
Applicable to only steady flows in which
the energy changes are negligible
Applicable to steady and unsteady flows
The fluid is ideal, incompressible, one
dimensional
Conditions within the control volume is not
taken in to consideration.
The theorem is useful when energy
changes are known and velocity and
pressure distribution are required
The theorem is useful when energy
changes are unknown and only overall
knowledge of the flow is required
Used to determine velocity distribution or
pressure distribution
Useful to determine the resultant force
acting on the boundary of flow passage
To determine the characteristics of flow
when there is abrupt change of flow
section ( sudden enlargement in pipe,
hydraulic jump..)
Useful when detailed information of the
flow condition inside the control volume is
not known
7. Application of Bernoulli's Equation for Uniform Flow interrupted by raised
humbs
velocity and depth of flow over the raised hump.
9. In order to adjust the water level in open channel “Channel Transitions” are
incorporated
Rise in bed elevation
Drop in bed elevation
Sudden enlargement in width
Sudden Contraction in width
The objective here in designing is to minimize the energy loss due to such
channel transitions
Concept of momentum , continuity and specific energy is used to solve such
flow problems
10. Specific Energy
Considering the energy correction factor= 1 and slope is insignificant
The head attained by a fluid element per unit weight wrt channel bed
as a datum:-
11. The two alternate depths represent two totally different flow regimes: slow & deep on the upper limb of the
curve (sub- critical flow) & fast & shallow on the lower limb of the curve, (Super critical flow)
Check this
12.
13. Salient feature of critical flow
Specific energy for a given discharge is minimum.
The discharge for a given specific energy is maximum.
The Froude number is equal to unity
The velocity head is equal to one half of the hydraulic depth
14. Example
A channel of a rectangular section, 7 m wide, discharges water at a rate of 18 m3/s with
an average velocity of 3 m/s. Find: (10 points)
A. Specific-energy head of the flowing water,
B. Depth of water, when specific energy is minimum,
C. Velocity of water, when specific energy is minimum,
D. Minimum specific-energy head of the flowing water,
E. Type of flow.
15.
16.
17. Home Study & Assignment Work
Case 2…….When Specific energy is constant Y= f (Q)
Critical depth in rectangular channels
Critical depth for Non rectangular channels
Computation of critical flow
18. 1.5. Hydraulic Jump
Topics
• Definition
• Impulse momentum equation
• Advantage of Hydraulic jump
• Assumptions made for analysis of hydraulic jump
19. The hydraulic jump is an important feature in open channel flow and is an example of
rapidly varied flow.
A hydraulic jump occurs when a super-critical flow and a sub-critical flow meet. The jump
is the mechanism for the two surfaces to join.
They join in an extremely turbulent manner which causes large energy losses. Because of
the large energy losses the energy or specific energy equation cannot be use in analysis, the
momentum equation is used instead.
If energy actually leaks from the system via frictional head loss the Bernoulli equation will
overstate the energy available to the flow and the related predictions of velocity and
depth will proportionately be in error. To recall our earlier strategy, we minimize this error
by considering only short reaches of channel and only gradual transitions.
In certain flow phenomena, however, we simply can no longer ignore the energy losses
and we must look to alternative ways of describing the flow.
20. When subcritical flow accelerates into the supercritical state the transition often is
smooth with gradually increasing velocity and decreasing depth bringing about a
smooth drop in the water surface until the alternate depth is achieved. Any disturbance
to the water surface is smoothed out by the surface or gravity wave propagation
mechanism discussed earlier.
In these circumstances energy losses are not great and the Bernoulli equation does a
credible job of describing the changes to the flow. When supercritical flow changes to
subcritical flow, however, there is no smoothing of the water surface upstream of the
transition because the high downstream velocity prevents upstream diffusion of the
water-surface deformation.
As a result the transition to subcritical flow is sudden and marked by an abrupt
discontinuity, or hydraulic jump, in the water.
23. Purposes of hydraulic jump
To increase the water level on the d/s of the hydraulic structures
To reduce the net up lift force by increasing the downward force due to the
increased depth of water,
To increase the discharge from a sluice gate by increasing the effective head
causing flow
For removing air pockets in a pipe line.
24. Analysis of Hydraulic Jump
Assumptions
The length of the hydraulic jump is small, consequently, the loss of head due to
friction is negligible,
The channel is horizontal as it has a very small longitudinal slope. The weight
component in the direction of flow is negligible.
The portion of channel in which the hydraulic jump occurs is taken as a control
volume & it is assumed the just before & after the control volume, the flow is
uniform & pressure distribution is hydrostatic.
Objective: To describe (drive) geometry of channel undertaking
hydraulic jump
Let us consider a small reach of a channel in which the hydraulic jump occurs.
The momentum of water passing through section (1) per unit time is
given as:
25. The momentum of water passing through section (1) per unit time is given as: