Pseudo-laminarization effect of several types of surfactant solutions in small-sized pipe flows

Ushida, Akiomi; Ichijo, Akira; Sato, Taisuke; Hasegawa, Tomiichi; Narumi, Takatsune

doi:10.1007/s00707-016-1616-3

Cited by 7 publications

(4 citation statements)

References 45 publications

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“…In all cases of inner tube diameters, friction factors in the turbulent flow region lay on the extension lines of those in the laminar flow region. These results indicate that Sample C solution maintained pseudo‐laminar flow in the turbulent flow region, which caused DR effect. Friction factors saturated at different values in the higher Reynolds number region when the inner tube diameter was 8 and 13 mm.…”

Section: Resultsmentioning

confidence: 83%

“…Especially, Hidema et al reported that the Sample C solution and slurry behave as non‐Newtonian fluids . Some researchers applied the generalized Reynolds number to characterize the non‐Newtonian flow of the surfactant solutions . Based on the power‐law model (Equation ), the generalized Reynolds number, Re * (–), is defined by Equation .…”

Section: Materials and Experimental Detailsmentioning

confidence: 99%

“…Zakin et al and Virk proposed the DR asymptote for surfactant solutions and polymer solutions, respectively . Experimental and numerical investigations indicated the reduction of Reynolds shear stress, damping of the turbulent vortical structures, and pseudo‐laminarization effect by the surfactants …”

Section: Introductionmentioning

confidence: 99%

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Pipe diameter effect on flow and heat transfer characteristics of ammonia alum hydrate slurries with additives

et al. 2019

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In this study, pipe diameter effect on flow and heat transfer characteristics of ammonia aluminium sulfate dodecahydrate (ammonia alum hydrate: AlNH 4 (SO 4) 2 Á12H 2 O) slurries with drag reducing surfactants and poly(vinyl alcohol) was investigated. Pressure loss and heat-transfer coefficients of ammonia alum hydrate solutions and slurries were measured with double-pipe heat exchangers with different inner tube diameters. Measurement results indicated that pseudo-laminarization by the surfactant caused drag-reduction effect and its saturated magnitude was affected by inner tube diameters. Pseudo-laminarization also produced heat transfer reduction effect and its magnitude was not affected by inner tube diameters. Calculation results of Colburn's j-factor divided by friction factors indicated that heat transportation efficiency of the hydrate solutions/slurries with additives was increased due to the contribution of drag-reduction effect.

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Section: Resultsmentioning

confidence: 83%

Section: Materials and Experimental Detailsmentioning

confidence: 99%

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Pipe diameter effect on flow and heat transfer characteristics of ammonia alum hydrate slurries with additives

et al. 2019

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“…However, there is limited knowledge on fluid transport in small-sized flow fields (≤1.0 mm). Meanwhile, Ushida et al reported pseudo-laminarization by adding micellar solutions and dilute polymer solutions [22,23], and they reported that the rheological properties (first normal stress differences) exhibited pseudo-laminarization. However, pseudo-laminarization by microbubble mixtures without rheological properties must be considered from a different perspective.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Laminarization of Mixed Microbubble Water and Complex Fluids in Capillary Flows

2021

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Symmetry in fluid flow is determined by external factors such as magnetic or electric fields. Owing to the electrical properties of fluids, liquids containing fine bubble or ionic surfactant molecules differ from the normal fluid flow. Therefore, the pressure drop and frictional coefficient in a pipe are measured and estimated for water alone, for mixed microbubble water (MB), and for complex fluids (anionic surfactant solution and polymer solution) in capillary flow with constant flow rate. For water alone, good agreement is obtained between the experimental and theoretical values for laminar Hagen–Poiseuille flow and the Blasius expression in turbulent flow. For the MB, pseudo-laminarization is suggested up to a Reynolds number of 4.2×103. Both the anionic surfactant solution and the polymer solution exhibit the same tendency as that of the MB. In explaining these behaviors, elasticity and electrical interaction are discussed, and electrical interaction on the capillary wall is strongly suggested to be a contributing factor. Additionally, surface tension is investigated and supports the discussion.

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Pseudo-laminarization effect of dilute and ultra-dilute polymer solutions on flows in narrow pipes

Ushida

Ogawa

Narumi

et al. 2018

Experimental Thermal and Fluid Science

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Pseudo-laminarization effect of several types of surfactant solutions in small-sized pipe flows

Cited by 7 publications

References 45 publications

Pipe diameter effect on flow and heat transfer characteristics of ammonia alum hydrate slurries with additives

Pipe diameter effect on flow and heat transfer characteristics of ammonia alum hydrate slurries with additives

Pseudo-Laminarization of Mixed Microbubble Water and Complex Fluids in Capillary Flows

Pseudo-laminarization effect of dilute and ultra-dilute polymer solutions on flows in narrow pipes

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