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{{Short description|Отпорност флуида на деформацију смицања}}
Праћење протицања [[течност]]и кроз [[цев]]и показује да се сви делови течности не крећу истом [[брзина|брзином]]. Највећу брзину имају делови течности дуж осе цеви, а најмању делови уз зидове цеви. Распоред брзина на пресеку цеви, нормалном на [[вектор|правац]] протицања течности. Течност се кроз цев не креће као целина, већ у слојевима који клизе један по другоме различитим брзинама. При протицању течности као да долази до њеног „раслојавања“. Слично се дешава и при [[кретање|кретању]], на пример равне даске, [[танкер]]а или справа по мирном [[језеро|језеру]]. Када се тело покрене, почиње и [[вода]] да се креће, али не као целина, већ по деловима (слојевима) који имају различите брзине. Повећањем [[растојање|растојања]] од пловног објекта брзина слојева течности се смањује. У течностима се јављају и [[сила|силе]] које се супротстављају кретању тела кроз течности. Набројане чињенице и појаве објашњавају се као последица постојања силе унутрашњег [[трење|трења]] у течностима, '''вискозност'''. Сила вискозности успорава протицање течности и кретање тела кроз течност.
 
Праћење протицања [[течност]]и кроз [[цев]]и показује да се сви делови течности не крећу истом [[брзина|брзином]].{{sfn|Symon|1971|p=}} Највећу брзину имају делови течности дуж осе цеви, а најмању делови уз зидове цеви. Распоред брзина на пресеку цеви, нормалном на [[вектор|правац]] протицања течности. Течност се кроз цев не креће као целина, већ у слојевима који клизе један по другоме различитим брзинама. При протицању течности као да долази до њеног „раслојавања“. Слично се дешава и при [[кретање|кретању]], на пример равне даске, [[танкер]]а или справа по мирном [[језеро|језеру]]. Када се тело покрене, почиње и [[вода]] да се креће, али не као целина, већ по деловима (слојевима) који имају различите брзине. Повећањем [[растојање|растојања]] од пловног објекта брзина слојева течности се смањује. У течностима се јављају и [[сила|силе]] које се супротстављају кретању тела кроз течности. Набројане чињенице и појаве објашњавају се као последица постојања силе унутрашњег [[трење|трења]] у течностима, '''вискозност'''. Сила вискозности успорава протицање течности и кретање тела кроз течност.{{sfn|Balescu|1975|pp=428–429}}{{sfn|Landau|Lifshitz|1987|p=}}
 
== Етимологија ==
Линија 10 ⟶ 12:
== Стоксов закон вискозности ==
Сила вискозности течности утиче на кретање тела која се у њој налазе ([[подморница]], [[ронилац]]). Наиме, течност пружа отпор таквом кретању, а тај отпор потиче од вискозности. Танак слој течности „прилепљен“ за тела креће се заједно са телом и истом брзином као тело. Услед тога се покрећу и остали слојеви течности.
 
== Референце ==
{{reflist}}
 
== Литература ==
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{{refend}}
 
Линија 22 ⟶ 241:
* [http://webbook.nist.gov/chemistry/fluid/ Особине флуида]
* [http://www.engineersedge.com/fluid_flow/fluid_data.htm Табела вискозитета]
* -{[http://www.enggcyclopedia.com/calculators/physical-properties/gas-viscosity/ Gas viscosity calculator as function of temperature]}-
* -{[http://www.enggcyclopedia.com/calculators/physical-properties/air-viscosity-calculator/ Air viscosity calculator as function of temperature and pressure]}-
* -{[http://web.ics.purdue.edu/~alexeenk/GDT/index.html Gas Dynamics Toolbox] – calculate coefficient of viscosity for mixtures of gases}-
* -{[http://glassproperties.com/viscosity/ViscosityMeasurement.htm Glass Viscosity Measurement] – viscosity measurement, viscosity units and fixpoints, glass viscosity calculation}-
* -{[https://web.archive.org/web/20100113072736/http://www.diracdelta.co.uk/science/source/k/i/kinematic%20viscosity/source.html Kinematic Viscosity] – conversion between kinematic and dynamic viscosity}-
* -{[http://www.thermexcel.com/english/tables/eau_atm.htm Physical Characteristics of Water] – a table of water viscosity as a function of temperature}-
* -{[http://www.iop.org/EJ/abstract/0953-8984/12/46/305 Vogel–Tammann–Fulcher Equation Parameters]}-
* -{[http://ddbonline.ddbst.de/VogelCalculation/VogelCalculationCGI.exe Calculation of temperature-dependent dynamic viscosities for some common components]}-
* -{[http://www.epa.gov/EPA-AIR/2005/July/Day-13/a11534d.htm "Test Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments"]}-
* -{[http://www.astro.uu.se/~bf/course/numhd_course/2_5_2Artificial_viscosity.html Artificial viscosity]}-
* -{[https://www.engineersedge.com/physics/viscosity_of_air_dynamic_and_kinematic_14483.htm Viscosity of Air, Dynamic and Kinematic, Engineers Edge]}-
 
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Преузето из „https://sr.wikipedia.org/wiki/Вискозност”