Razlika između verzija stranice "Reynoldsov broj"
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m r2.7.1) (robot dodaje: no:Reynoldstall |
m r2.7.2) (robot mijenja: ar:عدد رينولدز; kozmetičke promjene |
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U [[mehanika fluida|mehanici fluida]] i [[aerodinamika|aerodinamici]], '''Reynoldsov broj''' je iznos odnosa [[inercija]]lnih [[sila]] (''v<sub>s</sub> |
U [[mehanika fluida|mehanici fluida]] i [[aerodinamika|aerodinamici]], '''Reynoldsov broj''' je iznos odnosa [[inercija]]lnih [[sila]] (''v<sub>s</sub>ρ'') i [[viskoznost|viskoznih]] sila (''μ/L''), te on pokazuje relativnu bitnost ove dvije sile za date uslove strujanja. |
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== Definicija == |
== Definicija == |
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* ''v''<sub>s</sub> brzina fluda u ms<sup>-1</sup> |
* ''v''<sub>s</sub> brzina fluda u ms<sup>-1</sup> |
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* ''L'' karakteristična dužina m |
* ''L'' karakteristična dužina m |
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* μ je (apsolutna) [[viskoznost]] [[fluid]]a Nsm<sup>-2</sup> ili Pa·s |
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* ν je kinematička viskoznost fluida, definisana kao ν = μ/ρ, u m<sup>2</sup>s<sup>-1</sup> |
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* ρ je [[gustoća]] fluida u kgm<sup>-3</sup> |
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== Tipične vrijednosti Reynoldsovog broja == |
== Tipične vrijednosti Reynoldsovog broja == |
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* Osoba koja [[plivanje|pliva]] ~ 4×10<sup>6</sup> |
* Osoba koja [[plivanje|pliva]] ~ 4×10<sup>6</sup> |
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* [[Plavi kit]] ~ 3×10<sup>8</sup> |
* [[Plavi kit]] ~ 3×10<sup>8</sup> |
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* Veliki brod ([[RMS Queen Elizabeth 2]]) ~ |
* Veliki brod ([[RMS Queen Elizabeth 2]]) ~ 5×10<sup>9</sup> |
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== Također pogledajte == |
== Također pogledajte == |
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*[[Darcy-Weisbachova jednačina]] |
* [[Darcy-Weisbachova jednačina]] |
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*[[Hagen-Poiseuilleova jednačina]] |
* [[Hagen-Poiseuilleova jednačina]] |
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*[[Navier–Stokesove jednačine]] |
* [[Navier–Stokesove jednačine]] |
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*[[Reynoldsov transportni teorem]] |
* [[Reynoldsov transportni teorem]] |
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== Reference == |
== Reference == |
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{{Refspisak}} |
{{Refspisak}} |
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*[http://158.110.32.35/download/CERN07/R_ARFM_90.pdf] Rott, N., “Note on the history of the Reynolds number,” Annual Review of Fluid Mechanics, Vol. 22, 1990, pp. 1–11. |
* [http://158.110.32.35/download/CERN07/R_ARFM_90.pdf] Rott, N., “Note on the history of the Reynolds number,” Annual Review of Fluid Mechanics, Vol. 22, 1990, pp. 1–11. |
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*Zagarola, M.V. and Smits, A.J., “Experiments in High Reynolds Number Turbulent Pipe Flow.” AIAApaper #96-0654, 34th AIAA Aerospace Sciences Meeting, Reno, Nevada, January 15 - 18, 1996. |
* Zagarola, M.V. and Smits, A.J., “Experiments in High Reynolds Number Turbulent Pipe Flow.” AIAApaper #96-0654, 34th AIAA Aerospace Sciences Meeting, Reno, Nevada, January 15 - 18, 1996. |
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*Jermy M., “Fluid Mechanics A Course Reader,” Mechanical Engineering Dept., University of Canterbury, 2005, pp. d5.10. |
* Jermy M., “Fluid Mechanics A Course Reader,” Mechanical Engineering Dept., University of Canterbury, 2005, pp. d5.10. |
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*Hughes, Roger "Civil Engineering Hydraulics," Civil and Environmental Dept., University of Melbourne 1997, pp. 107-152 |
* Hughes, Roger "Civil Engineering Hydraulics," Civil and Environmental Dept., University of Melbourne 1997, pp. 107-152 |
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*Fouz, Infaz "Fluid Mechanics," Mechanical Engineering Dept., University of Oxford, 2001, pp96 |
* Fouz, Infaz "Fluid Mechanics," Mechanical Engineering Dept., University of Oxford, 2001, pp96 |
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*E.M. Purcell. "Life at Low Reynolds Number", American Journal of Physics vol 45, p. 3-11 (1977)[http://jilawww.colorado.edu/perkinsgroup/Purcell_life_at_low_reynolds_number.pdf] |
* E.M. Purcell. "Life at Low Reynolds Number", American Journal of Physics vol 45, p. 3-11 (1977)[http://jilawww.colorado.edu/perkinsgroup/Purcell_life_at_low_reynolds_number.pdf] |
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*Truskey, G.A., Yuan, F, Katz, D.F. (2004). ''Transport Phenomena in Biological Systems'' Prentice Hall, pp. 7. ISBN-10: 0130422045. ISBN-13: 978-0130422040. |
* Truskey, G.A., Yuan, F, Katz, D.F. (2004). ''Transport Phenomena in Biological Systems'' Prentice Hall, pp. 7. ISBN-10: 0130422045. ISBN-13: 978-0130422040. |
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== Vanjski linkovi == |
== Vanjski linkovi == |
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*[http://web.ics.purdue.edu/~alexeenk/GDT/index.html Gas Dynamics Toolbox] Calculate Reynolds number for mixtures of gases using VHS model |
* [http://web.ics.purdue.edu/~alexeenk/GDT/index.html Gas Dynamics Toolbox] Calculate Reynolds number for mixtures of gases using VHS model |
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*[http://www.calctool.org/CALC/eng/fluid/reynolds Browser-based Reynolds number calculator.] |
* [http://www.calctool.org/CALC/eng/fluid/reynolds Browser-based Reynolds number calculator.] |
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[[Kategorija:Konvekcija]] |
[[Kategorija:Konvekcija]] |
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[[ar: |
[[ar:عدد رينولدز]] |
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[[be-x-old:Лік Рэйнальдса]] |
[[be-x-old:Лік Рэйнальдса]] |
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[[bg:Критерий на Рейнолдс]] |
[[bg:Критерий на Рейнолдс]] |
Verzija na dan 4 juli 2011 u 00:58
U mehanici fluida i aerodinamici, Reynoldsov broj je iznos odnosa inercijalnih sila (vsρ) i viskoznih sila (μ/L), te on pokazuje relativnu bitnost ove dvije sile za date uslove strujanja.
Definicija
Najčešće se piše na slijedeći način[1]:
gdje je:
- vs brzina fluda u ms-1
- L karakteristična dužina m
- μ je (apsolutna) viskoznost fluida Nsm-2 ili Pa·s
- ν je kinematička viskoznost fluida, definisana kao ν = μ/ρ, u m2s-1
- ρ je gustoća fluida u kgm-3
Tipične vrijednosti Reynoldsovog broja
- Spermatozoid ~ 1×10−2
- Krvotok u mozgu ~ 1×102
- Krvotok u aorti ~ 1×103
- Osoba koja pliva ~ 4×106
- Plavi kit ~ 3×108
- Veliki brod (RMS Queen Elizabeth 2) ~ 5×109
Također pogledajte
- Darcy-Weisbachova jednačina
- Hagen-Poiseuilleova jednačina
- Navier–Stokesove jednačine
- Reynoldsov transportni teorem
Reference
- [1] Rott, N., “Note on the history of the Reynolds number,” Annual Review of Fluid Mechanics, Vol. 22, 1990, pp. 1–11.
- Zagarola, M.V. and Smits, A.J., “Experiments in High Reynolds Number Turbulent Pipe Flow.” AIAApaper #96-0654, 34th AIAA Aerospace Sciences Meeting, Reno, Nevada, January 15 - 18, 1996.
- Jermy M., “Fluid Mechanics A Course Reader,” Mechanical Engineering Dept., University of Canterbury, 2005, pp. d5.10.
- Hughes, Roger "Civil Engineering Hydraulics," Civil and Environmental Dept., University of Melbourne 1997, pp. 107-152
- Fouz, Infaz "Fluid Mechanics," Mechanical Engineering Dept., University of Oxford, 2001, pp96
- E.M. Purcell. "Life at Low Reynolds Number", American Journal of Physics vol 45, p. 3-11 (1977)[2]
- Truskey, G.A., Yuan, F, Katz, D.F. (2004). Transport Phenomena in Biological Systems Prentice Hall, pp. 7. ISBN-10: 0130422045. ISBN-13: 978-0130422040.
Vanjski linkovi
- Gas Dynamics Toolbox Calculate Reynolds number for mixtures of gases using VHS model
- Browser-based Reynolds number calculator.