Measurement of the surface concentration (liquid) of an evaporating multicomponent droplet using pendant droplet method

Raj, Mopuru Deepa; Mandal, Deepak Kumar; Navaneethakrishnan, S.; Bakshi, Shamit

doi:10.1007/s00348-009-0805-4

Cited by 15 publications

(16 citation statements)

References 7 publications

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“…Illustration of the experimental setup (1) acrylic enclosure (2) backlight controller (3) LED backlight (4) precision syringe pump(5) dispensing tubing and needle assembly (6) flow visualization laser(7) laser controller (8) CCD camera (9) digitized thermometer and hygrometer (10) data acquisition computer. The pendent drop is positioned between the electric field generator and magnetic field setup as per requirement.Results and discussions -The velocity fields and contours within the in the event of electrohydrodynamics for NaI based droplet have been illustrated inFig.…”

mentioning

confidence: 99%

“…Experimental methodologies -The experimental setup used is illustrated in Figure 1 4) precision syringe pump (5) dispensing tubing and needle assembly (6) flow visualization laser (7) laser controller (8) CCD camera (9) digitized thermometer and hygrometer (10) data acquisition computer. The pendent drop is positioned between the electric field generator and magnetic field setup as per requirement.…”

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confidence: 99%

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Electromagnetic field orientation and characteristics governed hydrodynamics within pendent droplets

2018

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The article reports the domineering governing role played by the direction of electric and magnetic fields on the internal advection pattern and strength within salt solution pendant droplets. Literature shows that solutal advection drives circulation cells within salt based droplets. Flow visualization and velocimetry reveals that the direction of the applied field governs the enhancement/reduction in circulation velocity and the directionality of circulation inside the droplet. Further, it is noted that while magnetic fields augment the circulation velocity, the electric field leads to deterioration of the same. The concepts of electro and magnetohydrodynamics are appealed to and a Stokesian stream function based mathematical model to deduce the field mediated velocities has been proposed. The model is found to reveal the roles of and degree of dependence on the governing Hartmann, Stuart, Reynolds and Masuda numbers. The theoretical predictions are observed to be in good agreement with experimental average spatio-temporal velocities. The present findings may have strong implications in microscale electro and/or magnetohydrodynamics.

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confidence: 99%

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confidence: 99%

Electromagnetic field orientation and characteristics governed hydrodynamics within pendent droplets

2018

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“…Figure 2 shows a detailed scheme of the measurement set-up that was built based on the study of Raj et al . [ 27 ]. This set-up was used to measure the surface tension coefficient of the SF.…”

Section: Methodsmentioning

confidence: 99%

“…One of them is called the pendant droplet [25], and it is a common method that calculates the surface tension coefficient of a liquid by image processing [26]. Figure 2 shows a detailed scheme of the measurement set-up that was built based on the study of Raj et al [27]. This set-up was used to measure the surface tension coefficient of the SF.…”

Section: Surface Tension Measurementmentioning

confidence: 99%

The wettability of electron spun membranes by synovial fluid

et al. 2021

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Aseptic loosening due to periprosthetic osteolysis has been accepted as one of the leading causes of revision procedures in patients with previous joint arthroplasty. Recently, several strategies for suppression of osteolysis were proposed, mostly based on biological treatment such as mitigation of chronic inflammatory reactions. However, these biological treatments do not stop the debris migration but only reduce the inflammatory reaction. To address this shortcoming, we propose the concept of ultrahigh molecular weighted polyethylene particles filtration storage by electrospun membranes. Firstly, the surface tension of synovial fluid (SF) is obtained by use of a pendant droplet. Secondly, the contact angle of the electrospun membranes wetted by two different liquids is measured to obtain the free surface energy using of the Owens–Wendt model. Additionally, the wettability of electrospun membranes by SF as a function of technology parameters is studied.

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“…For a theoretical description of the evaporation of sessile multicomponent droplets, knowledge about the space-time characteristics of the local concentration is highly desirable. Therefore, surface tension, infrared, and acoustic measurements were utilized to follow the local concentration at the surface or bottom of binary mixture droplets. , Furthermore, it was conjectured that aggregation-induced emission enabled the visualization of concentration gradients throughout the whole volume of evaporating sessile binary droplets . In that approach, a luminogen is added, which is nonemissive when it is dissolved in a good organic solvent, whereas it is emissive when it aggregates in a bad polar solvent.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of Sessile Binary Mixture Droplets: Time Dependence of Droplet Shape and Concentration Profile from One-Dimensional Magnetic Resonance Microscopy

et al. 2021

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Many technological applications like inkjet printing, coating, or cooling processes rely on the evaporation of sessile droplets. Regarding liquid mixtures, the understanding of the underlying physics is still incomplete and process optimization requires trial and error. Our main goal is to establish a novel method in this field, one-dimensional magnetic resonance microscopy, to investigate the evaporation of sessile binary mixture droplets in the microliter range. It allows us not only to determine the droplet volume and shape, including contact angle, but also to measure concentration profiles with a spatial resolution of a few micrometers. These capabilities are demonstrated for a mixture of 1-octanol (OCT) and pentadecafluoro-1-octanol (F-OCT) by combining spatially resolved 1H and 19F nuclear magnetic resonance measurements. We clearly observe three evaporation regimes for the OCT/F-OCT mixture. The first and second regimes are characterized by the predominant evaporation of F-OCT and are separated by a depinning event. The third regime starts when no F-OCT is left and, thus, features the evaporation of a pure OCT droplet. During all stages, concentration gradients perpendicular to the substrate are weak in the studied binary droplet.

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Measurement of the surface concentration (liquid) of an evaporating multicomponent droplet using pendant droplet method

Cited by 15 publications

References 7 publications

Electromagnetic field orientation and characteristics governed hydrodynamics within pendent droplets

Electromagnetic field orientation and characteristics governed hydrodynamics within pendent droplets

The wettability of electron spun membranes by synovial fluid

Evaporation of Sessile Binary Mixture Droplets: Time Dependence of Droplet Shape and Concentration Profile from One-Dimensional Magnetic Resonance Microscopy

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