Influence du dodecyl sulfate de sodium sur la tension interfaciale du système biphasé butanol‐eau

Mollet, Céline; Touhami, Y.; Hornof, V.

doi:10.1002/cjce.5450740217

Cited by 3 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Qualitatively, the same effect has been previously observed for a nonequilibrated 1-butanol−water system . In that case, the values measured using a drop volume tensiometer were significantly smaller (between 2 and 2.5 mN m -1 ) than those that we obtained. While the experimental procedure they used is not detailed enough for us to give a justification for this large difference in the results from the two methodologies, one possible explanation could be the fact that dynamic interfacial tension values measured with the drop volume method are quite dependent on the capillary flow rates (with larger IT measured at higher capillary flow rate) .…”

Section: Resultscontrasting

confidence: 89%

Evidence for the Existence of an Effective Interfacial Tension between Miscible Fluids: Isobutyric Acid−Water and 1-Butanol−Water in a Spinning-Drop Tensiometer

et al. 2006

View full text Add to dashboard Cite

We report definitive evidence for an effective interfacial tension between two types of miscible fluids using spinningdrop tensiometry (SDT). Isobutyric acid (IBA) and water have an upper critical solution temperature (UCST) of 26.3°C. We created a drop of the IBA-rich phase in the water-rich phase below the UCST and then increased the temperature above it. Long after the fluids have reached thermal equilibrium, the drop persists. By plotting the inverse of the drop radius cubed (r -3 ) vs the rotation rate squared (ω 2 ), we confirmed that an interfacial tension exists and estimated its value. The transition between the miscible fluids remained sharp instead of becoming more diffuse, and the drop volume decreased with time. We observed droplet breakup via the Rayleigh-Tomotika instability above the UCST when the rotation rate was decreased by 80%, again demonstrating the existence of an effective interfacial tension. When pure IBA was injected into water above the UCST, drops formed inside the main drop even as the main drop decreased in volume with time. We also studied 1-butanol in water below the solubility limit. Effective interfacial tension values measured over time were practically constant, while the interface between the two phases remains sharp as the volume of the drop declines. The effective interfacial tension was found to be insensitive to changes in temperature and always larger than the equilibrium interfacial tension. Although these results may not apply to all miscible fluids, they clearly show that an effective interfacial tension can exist and be measured by SDT for some systems.

show abstract

Section: Resultscontrasting

confidence: 89%

Evidence for the Existence of an Effective Interfacial Tension between Miscible Fluids: Isobutyric Acid−Water and 1-Butanol−Water in a Spinning-Drop Tensiometer

et al. 2006

View full text Add to dashboard Cite

show abstract

Influence of phase orientation on dynamic interfacial tension measured by drop volume tensiometry

Hornof

1997

Can J Chem Eng

Self Cite

View full text Add to dashboard Cite

In processes involving two liquid phases, such as enhanced oil recovery, one phase is often present in a drop form (drop phase) while the other is in continuous form (bulk phase). In the present paper, the effect of such phase orientation on dynamic interfacial tension between the two phases formed by the partially miscible system composed of butanol-1 and water has been investigated by using the method of drop volume tensiometry. With butanol-rich (butanol-I saturated by water ) as the drop phase and water-rich (water saturated by butanol-1) as the bulk phase, the interfacial tension is 1.70 * 0.02 mN/m. The interfacial tension for water-rich as the drop phase is almost identical at 1.72 * 0.03 mN/m. Addition of a surfactant, sodium dodecyl sulfate, to the system has been studied. When the surfactant is added to the drop phase (either butanol-rich or water-rich), the magnitude of the decrease in interfacial tension is smaller than when surfactant is added to the bulk phase (water-rich or butanol-rich) or to both phases. Under otherwise identical conditions, when the water-rich acts as the drop phase, the apparent interfacial tension is higher than that when the butanolrich acts as the drop phase.Dans les procedes faisant intervenir deux phases liquides, telle la recuperation assistee au petrole, I'une des phases se presente souvent sous forme de gouttes (phase de gouttes) et I'autre sous forme continue (phase dense). Dans cet article, on a etudie I'effet d'une telle orientation de phases sur la tension interfaciale dynamique entre les deux phases formees par le systeme partiellement miscible compose de butanol-I et d'eau par la methode de tensiometrie du volume des gouttes. Avec le milieu riche en butanol (butanol-1 sature par I'eau) comme phase de gouttes et du milieu riche en eau (eau saturee par du butanol-I) comme phase dense, la tension interfaciale est de 1,70 f 0.02 mN/m. La tension interfaciale pour le milieu riche en eau c o m e phase de gouttes est presque identique a 1,72 * 0,03 mN/m. L'ajout au systeme d'un surfactant, soit le sulfate de dodkcyl de sodium, est etudik. Lorsque le surfactant est ajoute a la phase des gouttes (soit riche en butanol, soit riche en eau), I'ampleur de la reduction de la tension interfaciale est moindre que lorsqu'il est ajoutk a la phase dense (riche en eau ou riche en butanol) ou aux deux phases. Dans des conditions par ailleurs identiques, lorsque le milieu riche en eau agit comme phase de gouttes, la tension interfaciale apparente est plus grande que lorsque c'est le milieu riche en butanol qui agit c o m e phase de gouttes.Keywords: drop volume tensiometry, dynamic interfacial tension, butanol-1 /water system, sodium dodecyl sulfate.ince the fmt field application in 1865, improved oil S recovery has evolved from simple water injection to the complicated processes involving the addition of solvents, chemicals, gas or heat. These additives change either one or several of factors such as the mobility ratio, rock wettability and watedoil interfacial tension (IFT) (Chiang e...

show abstract

Mass transfer and size control of partially miscible fluid drops in a flow focusing microfluidic device

2023

Physics of Fluids

View full text Add to dashboard Cite

We conducted laboratory experiments and numerical simulations to investigate the formation and evolution of drops formed by partially miscible two-phase fluid, n-butanol (the continuous phase) and water (the dispersed phase), in a flow focusing microfluidic system. We carefully calibrated the numerical model to obtain good agreement with experimental data in drop velocity and mass transfer, demonstrating the model's capability to capture realistic drop dynamics. Our detailed investigation of the numerical results allowed us to determine the mechanism of drop formation and obtain a relevant criterion in terms of the disperse-to-continuous flow ratio beyond which the tubing patterns would occur. Additionally, we found that the mass transfer between the two phases, specifically at the drop interface, strongly depends on the local distribution of dissolved concentration of the dispersed phase. To enhance mass transfer, we conducted numerical simulations on alternating curved channels, which allows for the lateral advection of the dispersed phase concentration in the continuous phase at the curved section. We found that this lateral movement enhances mass transfer at the drop interface. Through detailed investigation of numerical results, we addressed mechanisms of mass transfer enhancement in the curved channel. Overall, our findings provide insight into the mechanisms of drop formation and mass transfer in partially miscible two-phase fluids in microfluidic systems, which could be useful in designing and optimizing such systems for various applications.

show abstract

Influence du dodecyl sulfate de sodium sur la tension interfaciale du système biphasé butanol‐eau

Cited by 3 publications

References 3 publications

Evidence for the Existence of an Effective Interfacial Tension between Miscible Fluids: Isobutyric Acid−Water and 1-Butanol−Water in a Spinning-Drop Tensiometer

Evidence for the Existence of an Effective Interfacial Tension between Miscible Fluids: Isobutyric Acid−Water and 1-Butanol−Water in a Spinning-Drop Tensiometer

Influence of phase orientation on dynamic interfacial tension measured by drop volume tensiometry

Mass transfer and size control of partially miscible fluid drops in a flow focusing microfluidic device

Contact Info

Product

Resources

About