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单词 venturi tube
释义

venturi tube


Venturi tube

(vɛnˈtʃuːrɪ) n1. (General Physics) physics a device for measuring fluid flow, consisting of a tube so constricted that the pressure differential produced by fluid flowing through the constriction gives a measure of the rate of flow2. (General Physics) Also called: venturi a tube with a constriction used to reduce or control fluid flow, as one in the air inlet of a carburettor[C19: named after G. B. Venturi (1746–1822), Italian physicist]

ven•tu′ri tube`

(vɛnˈtʊər i)
n. 1. a device for measuring fluid flow, consisting of a tube constricted in such a way that a pressure differential is created between the center and the ends. 2. an alteration in the shape of the throat of a carburetor for controlling the flow of fuel. [after German. B. Venturi (1746–1822), Italian physicist]
Thesaurus
Noun1.venturi tube - a short tube inserted into a pipeline and used to measure the quantity of a liquid that is flowing in the pipelineVenturi tube - a short tube inserted into a pipeline and used to measure the quantity of a liquid that is flowing in the pipelinemeasuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something

venturi tube


Venturi tube

A device that consists of a gradually decreasing nozzle through which the fluid in a pipe is accelerated, followed by a gradually increasing diffuser section that allows the fluid to nearly regain its original pressure head (see illustration). It can be used to measure the flow rate in the pipe, or it can be used to pump a secondary fluid by aspirating it at the nozzle exit. The ability of the venturi tube to regain much of the original pressure head makes it especially useful in measuring the flow rate in systems which have a low pressure differential or pressure head that drives the fluid through the pipe or where the cost of pumping the fluid is an important factor. Conserving the pressure head decreases the amount of energy required to pump the fluid through the pipe.

Proportions of a Herschel-type venturi tube for standard fluid-flow measurementProportions of a Herschel-type venturi tube for standard fluid-flow measurement

A gradual expansion of flow downstream of a nozzle eliminates flow separation, allowing recovery of most of the original pressure head. In the case where the main flow separates from the wall, a large percentage of the fluid energy is lost in the eddies caused by the separation.

The flow through the device obeys Bernoulli's equation, and the formula for calculating the flow is similar to the equation for orifices. The venturi meter belongs to the class of differential pressure-sensing devices that are used to indicate flow. See Bernoulli's theorem

venturi tube

[ven′tu̇r·ē ‚tüb] (engineering) A constriction that is placed in a pipe and causes a drop in pressure as fluid flows through it, consisting essentially of a short straight pipe section or throat between two tapered sections; it can be used to measure fluid flow rate (a venturi meter), or to draw fuel into the main flow stream, as in a carburetor.

Venturi tube

A device that consists of a gradually decreasing nozzle through which the fluid in a pipe is accelerated, followed by a gradually increasing diffuser section that allows the fluid to nearly regain its original pressure head (see illustration). It can be used to measure the flow rate in the pipe, or it can be used to pump a secondary fluid by aspirating it at the nozzle exit. The ability of the venturi tube to regain much of the original pressure head makes it especially useful in measuring the flow rate in systems which have a low pressure differential or pressure head that drives the fluid through the pipe or where the cost of pumping the fluid is an important factor. Conserving the pressure head decreases the amount of energy required to pump the fluid through the pipe.

A gradual expansion of flow downstream of a nozzle eliminates flow separation, allowing recovery of most of the original pressure head. In the case where the main flow separates from the wall, a large percentage of the fluid energy is lost in the eddies caused by the separation.

The flow through the device obeys Bernoulli's equation, and the formula for calculating the flow is similar to the equation for orifices. The venturi meter belongs to the class of differential pressure-sensing devices that are used to indicate flow. See Flow measurement, Metering orifice

venturi tube

venturi tubeFlow pattern through a venturi tube.A tube that gradually narrows to a throat and then expands even more gradually to the exit. It is used to prove Bernoulli's theorem. In a venturi tube, the mass flow is constant and at any point the product of the pressure (P), a crosssectional area (a), and the speed (V) is constant. This is known as the venturi effect.

Venturi tube


Ven·tu·ri tube

(ven-tū'rē), a tube with a specially streamlined constriction to minimize energy losses in the fluid flowing through it while maximizing the fall in pressure in the constriction in accordance with Bernoulli law; the basis of the Venturi meter.

Venturi,

Giovanni B., Italian physicist, 1746-1822. Venturi apparatusVenturi aspiration vitrectomy deviceVenturi bobbin myringotomy tubeVenturi collar button myringotomy tubeVenturi effect - term applied to the operation of a Venturi tube and similar systems.Venturi grommet myringotomy tubeVenturi insufflatorVenturi maskVenturi meter - a device for measuring flow of a fluid.Venturi pediatric myringotomy tubeVenturi spirometerVenturi tube - a tube with a specially streamlined constriction.Venturi ventilator

Venturi tube


Related to Venturi tube: Bernoulli's principle, Pitot tube
  • noun

Words related to Venturi tube

noun a short tube inserted into a pipeline and used to measure the quantity of a liquid that is flowing in the pipeline

Related Words

  • measuring device
  • measuring instrument
  • measuring system
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更新时间：2025/2/7 19:36:15