Deanin luku Navigointivalikko

Dimensiottomat suureet





Deanin luku (De) on dimensioton suure, jota käytetään kierreputkien ja -kanavien yhteydessä. Deanin luku kuvaa keskipakovoimien suhdetta viskoosivoimiin ja määritellään yhtälöllä


De=Re(diD)1/2displaystyle De=Releft(frac d_iDright)^1/2





  • Re on Reynoldsin luku


  • didisplaystyle d_i on putken tai kanavan sisähalkaisija (m)


  • D on kierteisen putken tai kanavan muodostavan poikkileikkauksellisen ympyrän halkaisija (m)



Esimerkiksi donitsille d_i on donitsin putken sisähalkaisija ja D on koko donitsin halkaisija. Deanin lukua merkitään toisinaan myös symbolilla Dn.







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