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                                       Details van artikel 12 van 28 gevonden artikelen
 
 
  Instability of Surfactant Solution Flow in a Taylor Cell
 
 
Titel: Instability of Surfactant Solution Flow in a Taylor Cell
Auteur: Watanabe, K.
Takayama, T.
Ogata, S.
Verschenen in: Journal of visualization
Paginering: Jaargang 7 (2008) nr. 4 pagina's 273-280
Jaar: 2008-07-06
Inhoud: The hydrodynamic instability of surfactant solutions between two coaxial cylinders was investigated by using a laser-induced-fluorescence flow visualization technique to clarify the effect of drag-reducing additives on vortex formation in Taylor-Couette flow. The test fluids were Ethoquad O/12 surfactant solutions, which have a gel-like structure called "shear-induced structure" (SIS). Photographs of the formation of Görtler vortices were taken and compared with these of tap water. In the Taylor number range of 1.2 × 10^5 ⩽ T_a ⩽ 7.1×10^5, tap water and 10 ppm surfactant solution flows consisted of Taylor vortices and much smaller Görtler vortices at the rotating inner wall. However, for 50 and 100 ppm surfactant solutions, Taylor vortices were not apparent and Görtler vortices were collapsed. Measurements of the wavelength of Görtler vortices lead to the conclusion that surfactant solutions have a stabilizing effect on Görtler instabilities. This effect depends on surfactant concentration and becomes considerable with increasing acceleration of the inner cylinder.
Uitgever: IOS Press
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

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