TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
The Effect of Some Additives on the Friction in Liquids Subject to Rotational Motion
(* "Politehnica? University of Timisoara, P-ta Victoriei 2, 300006 Timisoara andra.tamas@chim.upt.ro, r.minea@rdslink.ro ** Silbermann Analytics GmbH, Germany nicu.bors@online.de)
Vol LX • No. 4/2008
Andra Tămaş*, Nicu Borş**, Romulus Minea*
* "Politehnica? University of Timisoara, P-ta Victoriei 2, 300006 Timisoara
andra.tamas@chim.upt.ro, r.minea@rdslink.ro
** Silbermann Analytics GmbH, Germany
nicu.bors@online.de

 Keywords   additive, friction, rotational motion, tensioactive agents

 Abstract
In this paper was studied the effect of some additive substances (tensioactive agents) on the friction of some liquids (ethylene glycol, paraffin or mineral oil) subject to rotational motion in ring-shaped spaces. Also, it was expressed the effect of friction (viscosity) decreasing as a function of additive concentration, Taylor-Reynolds number, dependent on the flow space geometry, angular velocity and the liquid physico-chemical properties.

 Rezumat
Īn lucrare se studiază efectul de aditivare a unor substanţe tensioactive (lauril sulfat de sodiu, nonilfenol polietoxilat), asupra frecării (vāscozităţii) īn lichide (etilenglicol, ulei de parafină, ulei mineral) supuse mişcării de rotaţie īn spaţii inelare. De asemenea, a fost evidenţiat efectul scăderii forţelor de frecare īn funcţie de concentraţia şi tipul aditivului folosit, valoarea criteriului Taylor-Reynolds, dependent de geometria spaţiului inelar, viteza unghiulară şi proprietăţile fizico-chimice ale lichidului.



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