...Ahmed H. Ahmed Kamel; Subhash N. Shah This study involves experimental investigation on the flow properties of aqueous surfactant-based (SB) fluids in small and large-scale coiled tubing. It aims at understanding the viscoelastic properties and its effect on the flow behavior of SB fluids in coiled...

...Weiguo Gu; Yasuo Kawaguchi; Dezhong Wang; Saito Akihiro Drag-reducing flow of dilute surfactant solution in the two-dimensional channel is investigated experimentally by using particle image velocimetry (PIV) system. Five hundred instantaneous velocity frames of u - v in the x - y plane are taken...

.... In such a process, curved liquid jets produced by rotating a perforated cylindrical drum are utilized to control drop sizes and breakup lengths. In general, smaller droplets are observed as the rotation rate is increased. The addition of surfactants along the free surface of the liquid jet as it emerges from...

...Tomiichi Hasegawa; Masahiro Karasawa; Takatsune Narumi Surfactant solutions are usually used under conditions accompanied by transient dynamic surfaces, and therefore the dynamic surface tension (DST) is important in many industrial processes. Theories regarding DST have been developed exclusively...

...Supathorn Phongikaroon; K. Peter Judd In this study, the dynamic effects of surfactant (oleyl alcohol) on the surface temperature and the near surface velocity field of a wind driven free surface are investigated. Different surfactant concentrations and wind speeds were examined to elucidate...

...Satoshi Ogata; Asano Kimura; Keizo Watanabe Performance of a centrifugal pump when handling surfactant solutions was measured experimentally. It was clarified that the pump efficiency with surfactant solutions was higher than that with tap water and increased with an increase in surfactant...

...Jinjia Wei; Fengchen Li; Bo Yu; Yasuo Kawaguchi The swirling flows of water and CTAC (cetyltrimethyl ammonium chloride) surfactant solutions ( 50 - 1000 ppm ) in an open cylindrical container with a rotating disc at the bottom were experimentally investigated by use of a double-pulsed PIV (particle...

...R. J. Wilkens; D. K. Thomas; S. R. Glassmeyer A set of experiments was performed to study flow pattern suppression in horizontal air-water pipe flow by means of surfactant additive. Results suggest that addition of the surfactant to the gas-liquid flow significantly reduces the occurrence of slug...

...Bo Yu; Yasuo Kawaguchi In the present study, we numerically investigated drag-reducing turbulent channel flows by surfactant additives. Surfactant additives were assumed to be uniformly distributed in the entire flow region by turbulent convection and diffusion, etc., but it was assumed...

...Mizue Munekata; Kazuyoshi Matsuzaki; Hideki Ohba Surfactants are well known as additives which induce drag reduction in the straight (nonswirling) pipe flow. However, in industrial applications of the drag-reducing effect, many flow fields besides the straight pipe flow need to be considered...

.... 13 January 2003 27 July 2004 11 03 2005 polymer solutions channel flow surfactants turbulence drag reduction velocimeters Drag reduction in turbulent flow, by low concentrations of polymers, is well known since the publication on the phenomenon by Toms 1 . Recently...