Venturi effect

I want to introduct something about AUTOMATIC REEL TO SHEET RULING MACHINE. LINE O MATIC GRAPHIC INDUSTRIES AHMEDABAD, INDIALINE O MATIC GRAPHIC INDUSTRIES, INDIA is pioneer in Manufacturing Automatic Reel to Sheet Ruling Machine and Other Machines for Making Exercise Notebooks in India, and enjoying very high reputation for its quality and its performance. Our 450 machines are working in India and 40 machines are working in overseas satisfactorily.AUTOMATIC REEL TO SHEET RULING MACHINEThis is automatic reel to sheet ruling machine which will rule the paper of exercise notebook according to your graphic and cut the sheet dully ruled both side.1. Automatic Reel to Sheet 3 Colour Super High Speed Ruling Machine Having Speed of 250 Meters/Minute.2. Automatic Reel to Sheet 3 Colour High Speed Ruling Machine Having Speed of 200 Meters/Minute.3. Automatic Reel to Sheet 3 & 4 Colour Normal Speed Ruling Machine Having Speed of 130 Meters/Minute.4. Automatic Reel to Sheet 3 Colour Mini High Speed Ruling Machine Having Speed of 100 Meters/MinuteVisit our website: xxxxx for technical detail
For other uses, see Venturi (disambiguation).

The pressure at "1" is higher than at "2" because the fluid speed at "1" is lower than at "2".

A flow of air through a venturi meter, showing the columns connected in a U-shape (a manometer) and partially filled with water. The meter is "read" as a differential pressure head in cm or inches of water.
The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe. The fluid velocity must increase through the constriction to satisfy the equation of continuity, while its pressure must decrease due to conservation of energy: the gain in kinetic energy is balanced by a drop in pressure or a pressure gradient force. An equation for the drop in pressure due to venturi effect may be derived from a combination of Bernoulli's principle and the equation of continuity.
The limiting case of the Venturi effect is when a fluid reaches the state of choked flow, where the fluid velocity approaches the local speed of sound. In choked flow the mass flow rate will not increase with a further decrease in the downstream pressure environment.
However, mass flow rate for a compressible fluid can increase with increased upstream pressure, which will increase the density of the fluid through the constriction (though the velocity will remain constant). This is the principle of operation of a convergent-divergent nozzle.
Referring to the diagram to the right, using Bernoulli's equation in the special case of incompressible flows (such as the flow of water or low speed flow of gas), the theoretical pressure drop (p1 ? p2) at the constriction would be given by .
The Venturi effect is named after Giovanni Battista Venturi, (17461822), an Italian physicist.
Experimental apparatus

This is a Venturi tube demonstration apparatus built out of PVC pipe and operated with a vacuum pump.
Venturi tubes
The simplest apparatus, as shown in the photograph and diagram, is a tubular setup known as a Venturi tube or simply a venturi. Fluid flows through a length of pipe of varying diameter. To avoid undue drag, a venturi tube typically has an entry cone of 30 degrees and an exit cone of 5 degrees.
A venturi can be used to measure the volumetric flow rate.
Since

Then

A venturi can also be used to mix a liquid with a gas. If a pump forces the liquid through a tube connected to a system consisting of a venturi to increase the water speed (the diameter decreases), a short piece of tube with a small hole in it, and last a venturi that decreases speed (so the pipe gets wider again), the gas will be sucked in through the small hole because of changes in pressure. At the end of the system, a mixture of liquid and gas will appear. See aspirator and pressure head for a discussion of this type of siphon.
Orifice plate
Venturi tubes are more expensive to construct than a simple orifice plate which uses the same principle as a tubular scheme, but the orifice plate causes significantly more permanent energy loss.
Aortic insufficiency is a chronic heart condition that occurs when the aortic valve's initial large stroke volume is released and the Venturi effect draws the walls together, which obstructs blood flow, which leads to a Pulsus Bisferiens.
Practical uses
The Venturi effect may be observed or used in the following:
The capillaries of the human circulatory system, where it indicates aortic regurgitation
Large cities where wind is forced between buildings
Inspirators that mix air and flammable gas in grills, gas stoves, Bunsen burners and airbrushes
Water aspirators that produce a partial vacuum using the kinetic energy from the faucet water pressure
Steam siphons using the kinetic energy from the steam pressure to create a partial vacuum
Atomizers that disperse perfume or spray paint (i.e. from a spray gun).
Foam firefighting nozzles and extinguishers
Carburetors that use the effect to suck gasoline into an engine's intake air stream
Protein skimmers (filtration devices for saltwater aquaria)
In automated pool cleaners that use pressure-side water flow to collect sediment and debris
The barrel of the modern-day clarinet, which uses a reverse taper to speed the air down the tube, enabling better tone, response and intonation
Compressed air operated industrial vacuum cleaners
Venturi scrubbers used to clean flue gas emissions
Injectors (also called ejectors) used to add chlorine gas to water treatment chlorination systems
Sand blasters used to draw fine sand in and mix it with air
Emptying bilge water from a moving boat through a small waste gate in the hullhe air pressure inside the moving boat is greater than the water sliding by beneath
A scuba diving regulator...(and so on) To get More information , you can visit some products about muntifunctional cable tester, electronic laser counter, . The AUTOMATIC REEL TO SHEET RULING MACHINE products should be show more here!