Capillary Dynamics of Water/Ethanol Mixtures

Amador, Carlos; Jia, Xiaodong; Ding, Yulong

doi:10.1021/acs.iecr.5b03366

Cited by 25 publications

(26 citation statements)

References 42 publications

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“…Measuring contact angle on rough surfaces, such as those formed for a bed of microsized fibers, can be challenging since the observed angle is the manifestation not just of the molecular interactions at the solid/liquid interphase but also of the microstructure of the surface (Figure 3). This effect is counted by the model of Wenzel which predicts that if a molecularly hydrophobic surface is rough, the appearance is that of an even more hydrophobic surface [27,28]. An interesting evidence of this phenomenon in particulate fibers is shown in Figure 4, where the contact angle of several groups of sugarcane bagasse fibers treated with solutions of variable silane concentrations appears almost invariant (between 122° and 129°), even though the absorbed amount of silane changes nearly in one order of magnitude (5.5 × 10 −5 to 1.04 × 10 −4 mol of silane per gram of fiber).…”

Section: Preparation Of Bagasse Microfibers For Biocomposite Fabricationmentioning

confidence: 99%

Biocomposites from Colombian Sugarcane Bagasse with Polypropylene: Mechanical, Thermal and Viscoelastic Properties

Hidalgo-Salazar¹,

Luna-Vera²,

PabloCorrea-Aguirre³

2019

Characterizations of Some Composite Materials

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Biocomposites are materials formed by mixing a polymer matrix and a filler or reinforcement, with the characteristic that at least one should be of biological origin. For this study, biocomposites were obtained from natural fibers of cane bagasse and polypropylene, using bagasse from postindustrial sources, originating from the production of sugarcane from the Valle-Cauca region in Colombia. In addition, cane bagasse fibers were treated chemically, with the purpose of improving the interfacial relationship. Polypropylene homopolymer was used as a polymeric matrix, which was mixed in a twin screw extruder, obtaining different materials as biocomposites. Finally, it was possible to obtain a suitable biocomposite for application in injection molding processes and studying its mechanical, viscoelastic, and thermal behaviors, through DSC, TGA, DMA, and SEM techniques.

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Section: Preparation Of Bagasse Microfibers For Biocomposite Fabricationmentioning

confidence: 99%

Biocomposites from Colombian Sugarcane Bagasse with Polypropylene: Mechanical, Thermal and Viscoelastic Properties

Hidalgo-Salazar¹,

Luna-Vera²,

PabloCorrea-Aguirre³

2019

Characterizations of Some Composite Materials

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“…Cao et al [13] investigated the dynamics of water/ethanol mixtures in capillary tubes and found that surface tension plays an important role in the travelling speed inside the capillary tubes. O'Loughlin et al [14] investigated the capillary rise dynamics of glycerol and aqueous glycerol solutions in vertical glass capillaries of various radii.…”

Section: Introductionmentioning

confidence: 99%

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

et al. 2021

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Capillary-driven action is an important phenomenon which aids the development of high-performance heat transfer devices, such as microscale heat pipes. This study examines the capillary rise dynamics of n-butanol/water mixture in a single vertical capillary tube with different radii (0.4, 0.6, and 0.85 mm). For liquids, distilled water, n-butanol, and their blends with varying concentrations of butanol (0.3, 0.5, and 0.7 wt.%) were used. The results show that the height and velocity of the capillary rise were dependent on the tube radius and liquid surface tension. The larger the radius and the higher the surface tension, the lower was the equilibrium height (he) and the velocity of rise. The process of capillary rise was segregated into three characteristic regions: purely inertial, inertial + viscous, and purely viscous regions. The early stages (purely inertial and inertial + viscous) represented the characteristic heights h1 and h2, which were dominant in the capillary rise process. There were linear correlations between the characteristic heights (h1, h2, and he), tube radius, and surface tension. Based on these correlations, a linear function was established between each of the three characteristic heights and the consolidated value of tube radius and surface tension (σL/2πr2).

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“…We further examined whether the capillary rise dynamics can be attributed to ethanol, oleic acid, or their mixture by repeating the capillary rise experiment in a tube coated with pure ethanol (Figure 2c). Being soluble in water and affecting the surface tension and viscosity of the water‐ethanol mixture (Cao et al, 2015), the capillary rise of water in the ethanol‐coated tube was substantially lower than that of water in the uncoated tube (Figure 2a vs. Figure 2c).…”

Section: Model Validation By Experimental Studies For Uniform Capillamentioning

confidence: 99%

Effects of Time‐Dependent Contact Angle on Wettability of Subcritically Water‐Repellent Soils

Wang

Wallach

2020

Water Resources Research

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Recent studies have indicated that under certain conditions, most soils are water repellent to some degree, which impacts agricultural fields, pastures, forests, grasslands, and turf areas. Soil water repellency originates from amphiphilic molecules that reorient during contact with water. However, models to describe the flow in soils affected by time-dependent contact angle (CA(t)) are still lacking. The current study aims to close this gap. The measured CA(t) for an oleic acid-coated glass surface and a uniform capillary tube indicated that the initial CA was substantially higher for the latter. However, the rate of CA decrease was similar for both cases in spite of the fact that the contact area between the water and the tube wall continuously increases by the capillary rise. This indicates that the amphiphilic molecules reorientation at the vicinity of the contact line rather than at the wetted tube area controls the CA dynamics. A mathematical model for flow in a uniform and sinusoidal capillary tube with CA(t) < 90°that includes model for the reorientation of the amphiphilic molecules was introduced. The model for uniform case was successfully verified by comparison with measured capillary rise in a coated uniform tube. The simulations indicated that nonuniform pore geometry amplifies the effect of CA(t) on the capillary rise dynamics. The stepwise meniscus propagation in the sinusoidal capillary tubes is driven by the time for the meniscus to reach the converging section of the tube. The retardation in capillary rise increases with tube waviness.

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Capillary Dynamics of Water/Ethanol Mixtures

Cited by 25 publications

References 42 publications

Biocomposites from Colombian Sugarcane Bagasse with Polypropylene: Mechanical, Thermal and Viscoelastic Properties

Biocomposites from Colombian Sugarcane Bagasse with Polypropylene: Mechanical, Thermal and Viscoelastic Properties

Effects of Tube Radius and Surface Tension on Capillary Rise Dynamics of Water/Butanol Mixtures

Effects of Time‐Dependent Contact Angle on Wettability of Subcritically Water‐Repellent Soils

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