Saturday 20 May 2017
Friday 28 April 2017
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gd-invest.com
get-free-reports-tips-and.info
getacoder.com
getinfoon.info
getjealous.com
educational-online.com
10sites.com
12-bestsites.com
12-topsites.com
1click.com
1homeshopping.info
1s.md
1st-free-article.com
1st-home-business.com
1st-lingerie.net
1st-portal.net
1step1.info
2020ok.com
25-bestsites.com
2itb.com
3-sites.com
4-you.com
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all-free-info.com
allcoolmusic.com
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amazon.co.uk
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make-money-with-inet.blogspot.com
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clobo.com
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quiksrv.com
unlimitedmusic2download.com
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artbeat.cjb.net
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urdu sad gazal
کسی پیارےکی یاد آتی رہتی ہے
میری آنکھ اشک برساتی رہتی ہے
اس کےبارے اتنا سوچا نا کروں
یہ بات باربار سمجھاتی رہتی ہے
جب تک اس سےبات نا کر لوں
تب تک میری روح پیاسی رہتی ہے
لگتا ہےتقدیربھی مجھ سے خفا ہے
میرےنشیمن پہ بجلیاں گراتی رہتی ہے
تو نےتومجھ سے دامن چھڑا لیا
میرے ساتھ تیری یاد باقی رہتی ہے
younas khan completed 10000 runs
يونس خان کو سکواش میں 10000رنز بنانے پر مبارکباد پیش کرتا ھوں
سائیں قایم علی شاہ
HISTORICAL DEVELOPMENT OF HYDRAULICS
Hydraulics Prof. B.S. Thandaveswara
Indian Institute of Technology Madras
1.2 HISTORICAL DEVELOPMENT OF HYDRAULICS
Hydraulic Engineering has served the mankind althrough the ages by providing drinking
water as well as protective measures against floods and storms. In the course of history
it has made the water resource available for human uses of many kinds. Management
of the world's water is a complex task and both its scope and its importance continue to
grow.
In course of time mankind has not only diverted and used the waters of the world for its
purposes, but by engaging nature into its service has turned deserts into fertile land
(e.g. Rajasthan Indira Gandhi Canal Project). Natural habitat is threatened in more and
more parts of the world by an ever-growing human population. Time has come for
formulation of the new value system. Thus long term needs are not only food, water and
shelter but also for an aesthetically pleasing, healthy, nurturing environment.
Sustainable development is "mantra" of the future.
Method of teaching Hydraulic Engineering has undergone several changes considering
the availability of computers, GPS, GIS, Remote sensing data, and web based tools.
1.2.1 The stages of Development
1950s Experimental hydraulics - empirical Hydraulics - Development of Engineering
hydraulics.
1960s Fundamental Research in unsteady flows, Open channel and ground water.
1970s Gathering of large data - hydrologic engineering - Flood control.
1980s
Initial awareness on the Environmental aspects. Large scale water Resources
planning, stochastic hydrology, System Analysis, distributed rainfall runoff
modeling.
Early
1990s
Modeling, urban hydrology, disaster management including floods,
computational engineering, CAD in hydraulics, Environmental hydraulics,
water quality - quantity integration, GIS based distributed modeling in
hydrology, Decision support systems.
Late
1990s
Integrating of hydraulics with water resources engineering for sustainable
development using GIS, GPS, Remote sensing - Hydro 2004 informatics,
Enviro informatics, Physical hydrology , space and Time scales, Climate
change and its impact on river basin, planning and management. Soft
computing (ANN, GA etc.,) IT impact on Water Data base and knowledge,
Integrated River basin Development. Reliability and Risk tools. WEB - Water
Earth Biota. Alternate sources of energy.
Hydraulics Prof. B.S. Thandaveswara
Indian Institute of Technology Madras
1.2.2 Future
Broad scope for specialisation in aggregation of many integrated aspects of the water
system.
To design integrated systems and integration of numerical modeling into information
systems.
Globalisation of water research and exchange through Internet and its impact on
sustainable development.
Integrating sociology, economics, biology, environment - Hydro bio modeling.
Global water markets, participatory approach.
history of hydraulics Hydraulics
A short history of hydraulics
Hydraulics is a very ancient science. The Egyptians and Babylonians constructed
canals, both for irrigation and for defensive purposes. No attempts were made at that
time to understand the laws of fluid motion. The first notable attempts to rationalize
the nature of pressure and flow patterns were undertaken by the Greeks. The laws of
hydrostatics and buoyancy were enunciated, Ctesibius and Hero designed hydraulic
equipment such as the piston pump and water clock, and (of course) there was the
Archimedes screw pump. The Romans appear, like the Egyptians, to have been more
interested in the practical and constructional aspects of hydraulics than in theorizing.
Thus, development continued slowly until the time of the Renaissance, when men
such as Leonardo Da Vinci began to publish the results of their observations. Ideas
which emerged then, respecting conservation of mass (continuity of flow), frictional
resistance and the velocity of surface waves, are still in use, though sometimes in a
more refined form. The Italian School became famous for their work. Toricelli et al.
observed the behaviour of water jets. They compared the path traced by a free jet with
projectile theory, and related the jet velocity to the square root of the pressure
generating the flow. Guglielmini et al. published the results of observations on river
flows. The Italians were hydraulicians in the original sense of the word, i.e. they were
primarily empiricists. Up to this point, mathematics had played no significant part in
this sort of scientific work. Indeed, at that time mathematics was largely confined to
the principles of geometry, but this was about to change.
In the 17th century, several brilliant men emerged. Descartes, Pascal, Newton, Boyle,
Hooke and Leibnitz laid the foundations of modern mathematics and physics. This
enabled researchers to perceive a logical pattern in the various aspects of mechanics.
On this basis, four great pioneers - Bernoulli, Euler, Clairaut and D'Alembert -
developed the academic discipline of hydrodynamics. They combined a sound
mathematical framework with an acute perception of the physical phenomena which
they were attempting to represent. lathe 18th century, further progress was made, both
in experimentation and in analysis. In Italy, for example, Poleni investigated the
concept of discharge coefficients. However, it was French and German thinkers who
now led the way. Henri de Pitot constructed a device which could measure flow
velocity. Antoine Chezy (1718-98), followed by Eytelwein and Woltmann, developed
a rational equation to describe flow in streams. Men such as Borda, Bossut and du
Buat not only extended knowledge, but took pains to see that the available knowledge
was disseminated. Woltmann and Venturi used Bernoulli's work as a basis for
developing the principles of flow measurement.
The 19th century was a period of further advance. Hagen (1797-1884) constructed
experiments to investigate the effects of temperature on pipe flow. His understanding
of the nature of fluid viscosity was limited to Newton's ideas, yet so careful was his
work that the results were within 1% of modern measurements. He injected sawdust
into the fluid for some of his experiments, in order to visualize the motion. He was
probably the first person knowingly to observe turbulence, though he was unable to
grasp its significance fully. At almost the same time, a French doctor (Poiseuille) was
also making observations on flow in pipes (in an attempt to understand the flow of
blood in blood vessels), which led to the development of equations for laminar flow
in pipes. Further contributions were made by Weisbach, Bresse and Henri Darcy, who
developed equations for frictional resistance in pipe and channel flows (the first
attempts to grapple with this problem coincided with signs of an incipient awareness
of the existence of the 'boundary layer'). During the later part of the century,
important advances were made in experimentation. The first practical wind tunnel,
the first towing tank for model testing of ships and the first realistic attempt to model
a tidal estuary (by 0. Reynolds) were all part of this flowering of knowledge. These
techniques are still used today. Reynolds also succeeded in defining the different
types of flow, observing cavitation and explaining Darcy's friction law in greater
detail.
Even at this stage, studies of fluid flows were subdivided into 'Classical
Hydrodynamics' (which was a purely mathematical approach with little interest in
experimental work) and experimental 'Hydraulics'. Navier, Stokes, Schwarz,
Christoffel and other hydrodynamicists all contributed to the development of a
formidable array of mathematical equations and methods (including the conformal
transformation). Their work agreed only sporadically with the practitioners (the
hydraulicians) and, indeed, there were frequently yawning disparities between the
results suggested by the two schools. The rapid growth of industry in the 19th and
20th centuries was by now producing a demand for a better understanding of fluid
flow phenomena. The real breakthrough came with the work of Prandtl. He proposed
(in 1901) that flow was 'divided into two interdependent parts. There is on the one
hand the free fluid which can be treated as inviscid (i.e. which obeyed the laws of
hydrodynamics) .. . and on the other hand the transition layer at the fixed boundaries'
(the transition layer is the thin layer of fluid within which frictional forces dominate).
With this brilliant insight, Prandtl effectively fused together the two disparate schools
of thought and laid the foundation for the development of the unified science of Fluid
Mechanics.
The 20th century has, in consequence, seen tremendous advances in the
understanding and application of fluid mechanics in almost every branch of
engineering. It is only possible to give the barest outline here. Prandtl and Th. von
Karman published a series of papers in the 1920s and 1930s, covering various aspects
of boundary layer theory and turbulence. Their work was supplemented by
increasingly sophisticated laboratory research (e.g. the work of Dryden and his
colleagues at NACA in the USA). These efforts had an impact on every aspect of
engineering fluid mechanics. In the 1930s, the efforts of Nikuradse (in Germany),
Moody (in America), Colebrook (Great Britain) and others resulted in a clearer
understanding of pipe flows and, in particular, of the factors affecting pipe friction.
This led directly to the modern methods for estimating flows in pipes and channels.
Since 1945, the advent of the electronic computer, and advances in sensing and data
logging equipment have revolutionized many aspects of hydraulics. Our
understanding of the nature of turbulence, steady and unsteady flows in channels,
sediment transport and maritime phenomena have developed rapidly. This has been
matched by developments in software. Today's engineer, with a modern personal
computer or workstation at his or her disposal, has the tools to'achieve more effective
and economic designs.
International research continues at an intensive pace, as our world facesmany
problems, social and environmental. On the threshold of the 21st century, there is
every reason to suppose that engineers and scientists will face exciting and difficult
challenges that will place the fullest demands upon their skills.
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A short history of hydraulics Hydraulics is a very ancient science. The Egyptians and Babylonians constructed canals, both for irrigation a...
