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Статті в журналах з теми "Oscillating Drop"

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Автор: Grafiati

Опубліковано: 8 червня 2024

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1

Szakáll, Miklós, Karoline Diehl, Subir K. Mitra, and Stephan Borrmann. "A Wind Tunnel Study on the Shape, Oscillation, and Internal Circulation of Large Raindrops with Sizes between 2.5 and 7.5 mm." Journal of the Atmospheric Sciences 66, no. 3 (March 1, 2009): 755–65. http://dx.doi.org/10.1175/2008jas2777.1.

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Abstract Precipitation prediction using weather radars requires detailed knowledge of the shape parameters of raindrops falling at their terminal velocities in air. Because the raindrops undergo oscillation, the most important shape parameters from the radar prediction point of view are the equilibrium drop shape, the time-averaged axis ratio, and the oscillation frequency. These parameters for individual water drops with equivalent diameter from 2.5 to 7.5 mm were investigated in a vertical wind tunnel using high-speed video imaging. A very good agreement was found between the measured and the theoretically determined raindrop shape calculated by a force balance model. A new method was developed to determine the equivalent drop diameter with the help of the oscillation frequency. The drop size determination by means of the frequency method was found to be three times more precise than by volumetric methods. The time-averaged axis ratio was found to be equal to the equilibrium axis ratio in the investigated raindrop size range. The analysis of the oscillation frequency of the raindrops revealed that the drops undergo multimode oscillations and are oscillating in a transverse mode in addition to an axisymmetric oblate–prolate mode. Experiments are included in which the internal circulation associated with drop oscillation was investigated and compared to theory.

2

Thurai, M., V. N. Bringi, M. Szakáll, S. K. Mitra, K. V. Beard, and S. Borrmann. "Drop Shapes and Axis Ratio Distributions: Comparison between 2D Video Disdrometer and Wind-Tunnel Measurements." Journal of Atmospheric and Oceanic Technology 26, no. 7 (July 1, 2009): 1427–32. http://dx.doi.org/10.1175/2009jtecha1244.1.

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Abstract Comparisons of drop shapes between measurements made using 2D video disdrometer (2DVD) and wind-tunnel experiments are presented. Comparisons are made in terms of the mean drop shapes and the axis ratio distributions. Very close agreement of the mean shapes is seen between the two sets of measurements; the same applies to the mean axis ratio versus drop diameter. Also, in both sets of measurements, an increase in the oscillation amplitudes with increasing drop diameter is observed. In the case of the 2DVD, a small increase in the skewness was also detected. Given that the two sets of measurements were conducted in very different conditions, the agreement between the two sets of data implies a certain “robustness” in the mean shape of oscillating drops that may be extended to natural raindrop oscillations, at least in steady rainfall and above the surface layer.

3

Khaibullina, A. I., A. R. Khayrullin, and V. K. Ilyin. "Experimental study of oscillating flow in tube bundle." Vestnik IGEU, no. 6 (December 28, 2023): 29–37. http://dx.doi.org/10.17588/2072-2672.2023.6.029-037.

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Oscillating reciprocating flows are found in a variety of engineering applications. The mechanisms of oscillating flows have not been sufficiently studied. Oscillating flows can be created artificially to increase heat transfer equipment by intensifying heat transfer. Thus, this paper studies the flow and heat transfer characteristics of a tube bundle under the influence of oscillating flow. The assessment of heat transfer and the hydrodynamic flow pattern in a tube bundle during flow oscillations is carried out on the basis of experimental studies. Flow oscillations have been created by a pneumatic system that drove a pulsator. The time characteristic of the pressure drop of the tube bundle has been recorded using an oscilloscope and pressure drop sensors. To assess the dynamics of flow velocity, the high-speed shooting method is used. The heat exchange of a tube bundle has been determined by the electrical power expended to maintain a constant temperature on the tube side of the bundle. For the first time, heat transfer and the hydrodynamic flow pattern with asymmetrical flow oscillations in an inline tube bundle are studied experimentally. It is shown that the shape of oscillations of flow velocity and pressure drop depend on frequency. It has been found that with increasing frequency there is an increase in the values of flow velocity and pressure drop. It has been determined that for certain moments of time, the flow velocity and pressure drop during asymmetrical oscillations exceed symmetrical ones. It has been established that the heat transfer rate of a bundle increases by 1,7 times with an increase in frequency. It has been shown that asymmetrical oscillations are more effective in intensifying heat transfer than symmetrical ones by an average of 1,1 times. Analysis of the results obtained has showed the possibility of intensifying heat transfer in a tube bundle using oscillating flows. Thus, oscillating flows can be used to increase the efficiency of heat exchange equipment. The results obtained on the hydrodynamic flow pattern can be used in mathematical modeling of oscillating flows, which are necessary to expand the operating parameters of the study and determine the most effective ones.

4

Sterlyadkin, Victor V. "Some Aspects of the Scattering of Light and Microwaves on Non-Spherical Raindrops." Atmosphere 11, no. 5 (May 21, 2020): 531. http://dx.doi.org/10.3390/atmos11050531.

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A review of the author’s work on the study of the microphysics of rain is carried out. The effect of an anomalously high modulation of light scattered by oscillating drops of water, which consists in the formation of powerful pulses of light when illuminating an oscillating drop with continuous light and observation at scattering angles near a first-order rainbow, is described and explained. The anomalous scattering tracks obtained in the photographs provide information on the mass, average shape, mode, and amplitude of oscillations for each drop, by analogy with the Wilson camera. In field measurements, spatial selection of droplets by size was detected, when droplets of different sizes were grouped in different parts of space. The theoretical substantiation of the grouping of rain particles in space under the influence of wind gusts is carried out. It has been shown that the grouping and clustering of raindrops affects the relationship between radar reflectivity Z and rain intensity R. The influence of non-sphericity and oscillation of raindrops on the scattering of microwave radiation is studied. Polarization methods are proposed for enhancing or sharply reducing the contributions of the asphericity of raindrops to reflected radar signals.

5

Barrabino, Albert, Torleif Holt, Bård Bjørkvik, and Erik Lindeberg. "First Approach to Measure Interfacial Rheology at High-Pressure Conditions by the Oscillating Drop Technique." Colloids and Interfaces 5, no. 2 (April 13, 2021): 23. http://dx.doi.org/10.3390/colloids5020023.

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An oscillating drop rheometer capable of operating under conditions of high pressure and high temperature has been built. The oscillating drop mechanism was able to support pressures as high as 1300 bar and successfully performed oscillations at constant pressure. Apparent elastic and viscous complex moduli were measured for a system of CO2 and synthetic seawater containing 100 ppm of a linear alkyl ethoxylate surfactant for different pressures and temperatures. The moduli had strong dependencies on both pressure and temperature. At temperatures of 40 and 80 °C, the apparent elastic modulus passed through a maximum for pressures between 100 and 300 bar. The harmonic distortion of the oscillations was calculated for all measurements, and it was found that drop oscillations below ca. 2.6 µL caused distortions above 10% due to a mechanical backlash of the motor.

6

De Maio, L., and F. Dunlop. "Sessile Drop on Oscillating Incline." Journal of Applied Fluid Mechanics 11, no. 6 (November 1, 2018): 1471–76. http://dx.doi.org/10.29252/jafm.11.06.28380.

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7

Egry, I., H. Giffard, and S. Schneider. "The oscillating drop technique revisited." Measurement Science and Technology 16, no. 2 (January 20, 2005): 426–31. http://dx.doi.org/10.1088/0957-0233/16/2/013.

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8

Goncalves Dos Santos, Angelica, Francisco Javier Montes-Ruiz Cabello, Fernando Vereda, Miguel A. Cabrerizo-Vilchez, and Miguel A. Rodriguez-Valverde. "Oscillating Magnetic Drop: How to Grade Water-Repellent Surfaces." Coatings 9, no. 4 (April 21, 2019): 270. http://dx.doi.org/10.3390/coatings9040270.

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Evaluation of superhydrophobic (SH) surfaces based on contact angle measurements is challenging due to the high mobility of drops and the resolution limits of optical goniometry. For this reason, some alternatives to drop-shape methods have been proposed such as the damped-oscillatory motion of ferrofluid sessile drops produced by an external magnetic field. This approach provides information on surface friction (lateral/shear adhesion) from the kinetic energy dissipation of the drop. In this work, we used this method to compare the low adhesion of four commercial SH coatings (Neverwet, WX2100, Ultraever dry, Hydrobead) formed on glass substrates. As ferrofluid, we used a maghemite aqueous suspension (2% v/v) synthesized ad hoc. The rolling magnetic drop is used as a probe to explore shear solid–liquid adhesion. Additionally, drop energy dissipates due to velocity-dependent viscous stresses developed close to the solid–liquid interface. By fitting the damped harmonic oscillations, we estimated the decay time on each coating. The SH coatings were statistically different by using the mean damping time. The differences found between SH coatings could be ascribed to surface–drop adhesion (contact angle hysteresis and apparent contact area). By using this methodology, we were able to grade meaningfully the liquid-repelling properties of superhydrophobic surfaces.

9

Ivantsov, Andrey, Tatyana Lyubimova, Grigoriy Khilko, and Dmitry Lyubimov. "The Shape of a Compressible Drop on a Vibrating Solid Plate." Mathematics 11, no. 21 (November 3, 2023): 4527. http://dx.doi.org/10.3390/math11214527.

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The influence of high-frequency vibrations on the shape of a compressible drop placed on an oscillating solid substrate is studied in this paper. Due to the significant difference in characteristic temporal scales, the average and pulsating motions of the drop can be considered separately. For nearly hemispherical drop, the solution to the problem of pulsating motion is found in the form of series in Legendre polynomials. Frequencies of natural sound oscillations of hemispherical axisymmetric drop are obtained. Resonances of the acoustic mode of drop oscillations are found. The problem of forced oscillations of hemispherical drop in the limit of weakly compressible liquid is considered. It is found that drop oscillation amplitude grows with vibration intensity according to quadratic law, which is consistent with the solution of the pulsation problem for finite compressibility assumption. A variational principle for calculation of average drop shape is formulated based on minimization of energy functional for the case, so the compressibility of the liquid should be taken into account. It is shown that the functional (the sum of the kinetic and potential energies of the pulsating flow, the kinetic energy of the averaged flow, and the surface tension energy of the drop) decreases and reaches a minimum value at quasi-equilibrium state, in which the average shape of the drop becomes static. The influence of vibrations on the drop shape is studied for small values of the vibrational parameter. The surface of the drop in the absence of vibrations is assumed to be hemispherical. Calculations showed that under vibrations, drop height decreases, while the area of the base increases.

10

WUNDERLICH, RAINER K., and MARKUS MOHR. "Non-linear effects in the oscillating drop method for viscosity measurements." High Temperatures-High Pressures 48, no. 3 (2020): 253–77. http://dx.doi.org/10.32908/hthp.v48.648.

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The contribution of non-linear fluid flow effects to the damping of surface oscillations in the oscillation drop method was investigated in a series of experiments in an electromagnetic levitation device installed on the International Space station, ISS-EML. In order to correctly evaluate the damping time constant from measured surface oscillation decays the effect of a modulated signal response on measured surface oscillation decay curves was investigated. It could be shown that various experimentally observed signal patterns could be well represented by a modulated response. The physical origin of such modulations is seen in rotation and precession. Over a temperature range of 220 K covered by different surface oscillation excitation pulses with an initial sample shape deformation of 5 – 10% the amplitude of surface oscillations as a function of time could be very well represented by a Lamb type damping with a temperature dependent viscosity. A direct comparison of surface oscillation decay times measured in the same temperature range but for different oscillation amplitudes showed no non-linear contribution to the damping time constant with a confidence level better 10%.

11

Wilkes, Edward D., and Osman A. Basaran. "Drop Ejection from an Oscillating Rod." Journal of Colloid and Interface Science 242, no. 1 (October 2001): 180–201. http://dx.doi.org/10.1006/jcis.2001.7729.

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12

BENILOV, E. S., and J. BILLINGHAM. "Drops climbing uphill on an oscillating substrate." Journal of Fluid Mechanics 674 (March 7, 2011): 93–119. http://dx.doi.org/10.1017/s0022112010006452.

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Recent experiments by Brunet, Eggers & Deegan (Phys. Rev. Lett., vol. 99, 2007, p. 144501 and Eur. Phys. J., vol. 166, 2009, p. 11) have demonstrated that drops of liquid placed on an inclined plane oscillating vertically are able to climb uphill. In the present paper, we show that a two-dimensional shallow-water model incorporating surface tension and inertia can reproduce qualitatively the main features of these experiments. We find that the motion of the drop is controlled by the interaction of a ‘swaying’ (odd) mode driven by the in-plane acceleration and a ‘spreading’ (even) mode driven by the cross-plane acceleration. Both modes need to be present to make the drop climb uphill, and the effect is strongest when they are in phase with each other.

13

Grigoriev, A., S. Shiryaeva, and N. Kolbneva. "Nonlinear Correction to Intensity of Dipole Radiation of Uncharged Drop Oscillating in External Electrostatic Field." Elektronnaya Obrabotka Materialov 57, no. 3 (June 2021): 50–61. http://dx.doi.org/10.52577/eom.2021.57.3.50.

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An asymptotic calculation of a dipole electromagnetic radiation of an uncharged conductive drop oscillating with a finite amplitude in an external electrostatic field to within the second order of smallness inclusive on the relation of the amplitude of oscillations to the radius of an initial drop is carried out. It is shown that the first mode of oscillations is excited in the calculation of the second order of smallness. As a result, the centers of the induced charges with different signs will synchronously oscillate, and the drop will radiate electromagnetic waves of dipolar type, forming the nonlinear correction to intensity of dipole radiation of the first order of smallness. An assessment of the intensity of electromagnetic radiation of this correction and of the width of a strip of frequencies depending on the size of a drop and the strength of an external electrostatic field is carried out.

14

Kozlov, Victor, Stanislav Subbotin, and Ivan Karpunin. "Supercritical Dynamics of an Oscillating Interface of Immiscible Liquids in Axisymmetric Hele-Shaw Cells." Fluids 8, no. 7 (July 12, 2023): 204. http://dx.doi.org/10.3390/fluids8070204.

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The oscillation of the liquid interface in axisymmetric Hele-Shaw cells (conical and flat) is experimentally studied. The cuvettes, which are thin conical layers of constant thickness and flat radial Hele-Shaw cells, are filled with two immiscible liquids of similar densities and a large contrast in viscosity. The axis of symmetry of the cell is oriented vertically; the interface without oscillations is axially symmetric. An oscillating pressure drop is set at the cell boundaries, due to which the interface performs radial oscillations in the form of an oscillating “tongue” of a low-viscosity liquid, periodically penetrating into a more viscous liquid. An increase in the oscillation amplitude leads to the development of a system of azimuthally periodic structures (fingers) at the interface. The fingers grow when the viscous liquid is forced out of the layer and reach their maximum in the phase of maximum displacement of the interface. In the reverse course, the structures decrease in size and, at a certain phase of oscillations, take the form of small pits directed toward the low-viscosity fluid. In a conical cell, a bifurcation of period doubling with an increase in amplitude is found; in a flat cell, it is absent. A slow azimuthal drift of finger structures is found. It is shown that the drift is associated with the inhomogeneity of the amplitude of fluid oscillations in different radial directions. The fingers move from the region of a larger to the region of a lower amplitude of the interface oscillations.

15

Matsumoto, Taihei, Hidetoshi Fujii, Takaharu Ueda, Masayoshi Kamai, and Kiyoshi Nogi. "Oscillating drop method using a falling droplet." Review of Scientific Instruments 75, no. 5 (May 2004): 1219–21. http://dx.doi.org/10.1063/1.1711149.

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16

Hoath, Stephen D., Wen-Kai Hsiao, Sungjune Jung, Lisong S. Yang, Colin D. Bain, Sid C. Wright, Neil F. Morrison, Oliver G. Harlen, Graham D. Martin, and Ian M. Hutchings. "Properties of PEDOT:PSS from Oscillating Drop Studies." NIP & Digital Fabrication Conference 30, no. 1 (January 1, 2014): 299–303. http://dx.doi.org/10.2352/issn.2169-4451.2014.30.1.art00072_1.

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17

Hsu, Chin-Tsau, Huili Fu, and Ping Cheng. "On Pressure-Velocity Correlation of Steady and Oscillating Flows in Regenerators Made of Wire Screens." Journal of Fluids Engineering 121, no. 1 (March 1, 1999): 52–56. http://dx.doi.org/10.1115/1.2822010.

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A facility capable of generating steady and oscillating flows was constructed and experiments were conducted to investigate the pressure-drop characteristics of regenerators packed with wire screens. Both the velocity and pressure-drop across the regenerator were measured. To accurately determine the correlation between pressure-drop and velocity, the experiments covered a wide range from very low to very high Reynolds numbers, Reh. The steady flow results reveal that a three-term correlation with a term proportional to Reh−1/2 in addition to the Darcy-Forchheimer two-term correlation will fit best to the data. This Reh−1/2 term accounts for the boundary layer effect at intermediate Reynolds number. The results also show that the correlation for oscillating flows coincides with that for steady flows in 1 < Reh < 2000. This suggests that the oscillating flows in the regenerators behave as quasi-steady at the frequency range of less than 4.0 Hz, which is the maximum operable oscillating flow frequency of the facility.

18

WILKES, EDWARD D., and OSMAN A. BASARAN. "Hysteretic response of supported drops during forced oscillations." Journal of Fluid Mechanics 393 (August 25, 1999): 333–56. http://dx.doi.org/10.1017/s0022112099005819.

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Viscous liquid drops undergoing forced oscillations have been shown to exhibit hysteretic deformation under certain conditions both in experiments and by solution of simplified model equations that can only provide a qualitative description of their true response. The first hysteretic deformation results for oscillating pendant drops obtained by solving the full transient, nonlinear Navier–Stokes system are presented herein using a sweep procedure in which either the forcing amplitude A or frequency Ω is first increased and then decreased over a given range. The results show the emergence of turning-point bifurcations in the parameter space of drop deformation versus the swept parameter. For example, when a sweep is carried out by varying Ω while holding A fixed, the first turning point occurs at Ω ≡ Ωu as Ω is being increased and the second one occurs at Ω ≡ Ωl < Ωu as Ω is being decreased. The two turning points shift further from each other and toward lower values of the swept parameter as Reynolds number Re is increased. These turning points mark the ends of a hysteresis range within which the drop may attain either of two stable steady oscillatory states – limit cycles – as identified by two distinct solution branches. In the hysteresis range, one solution branch, referred to as the upper solution branch, is characterized by drops having larger maximum deformations compared to those on the other branch, referred to as the lower solution branch. Over the range Ωl [les ] Ω [les ] Ωu, the sweep procedure enables detection of the upper solution branch which cannot be found if initially static drops are set into oscillation as in previous studies of forced oscillations of supported and captive drops, or liquid bridges. The locations of the turning points and the associated jumps in drop response amplitudes observed at them are studied over the parameter ranges 0.05 [les ] A [les ] 0.125, 20 [les ] Re [les ] 40, and gravitational Bond number 0 [les ] G [les ] 1. Critical forcing amplitudes for onset of hysteresis are also determined for these Re values. The new findings have important ramifications in several practical applications. First, that Ωu − Ωl increases as Re increases overcomes the limitation which is inherent to the current practice of inferring the surface tension and/or viscosity of a bridge/drop liquid from measurement of its resonance frequencies (Chen & Tsamopoulos 1993; Mollot et al. 1993). Moreover, that the value of A for onset of hysteresis can be as low as 5% of the drop radius, or lower, has important implications for other free-surface flows such as coating flows.

19

Shiryaeva, S. O., A. I. Grigor’ev, D. F. Belonozhko, and A. S. Golovanov. "Electromagnetic radiation of a nonlinearly oscillating charged drop." Technical Physics Letters 27, no. 10 (October 2001): 875–77. http://dx.doi.org/10.1134/1.1414562.

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20

Angilella, J. R., and J. P. Brancher. "Note on chaotic advection in an oscillating drop." Physics of Fluids 15, no. 1 (January 2003): 261–64. http://dx.doi.org/10.1063/1.1524193.

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21

Ravera, Francesca, Giuseppe Loglio, and Volodymyr I. Kovalchuk. "Interfacial dilational rheology by oscillating bubble/drop methods." Current Opinion in Colloid & Interface Science 15, no. 4 (August 2010): 217–28. http://dx.doi.org/10.1016/j.cocis.2010.04.001.

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22

Meradji, S., T. P. Lyubimova, D. V. Lyubimov, and B. Roux. "Numerical Simulation of a Liquid Drop Freely Oscillating." Crystal Research and Technology 36, no. 7 (August 2001): 729. http://dx.doi.org/10.1002/1521-4079(200108)36:7<729::aid-crat729>3.0.co;2-3.

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23

BRACKER, G. P., E. B. BAKER, J. NAWER, M. E. SELLERS, A. K. GANGOPADHYAY, K. F. KELTON, X. XIAO, et al. "The effect of flow regime on surface oscillations during electromagnetic levitation experiments." High Temperatures-High Pressures 49, no. 1-2 (2020): 49–60. http://dx.doi.org/10.32908/hthp.v49.817.

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During containerless processing, the oscillating drop method can be used to measure the surface tension and viscosity of a levitated melt. Through containerless processing, reactive melts that cannot be measured through conventional methods can be accurately measured; however, the accuracy of this method is dependent on the internal flow within the drop. While laminar flow does not redistribute the momentum of the oscillations, turbulent flow does redistribute the momentum of the flow and, as a result, dominates the damping. As a result, it is important to understand the internal flow behavior and the factors that affect the flow during these experiments. Models are used for the indirect quantification and characterization of the internal flow using the experimental parameters and material properties. In some cases, such as Cu50Zr50, the flow is laminar over the full range of the experiment. In other cases, including Al75Ni25, the sample is dominated by turbulent flow at high temperatures and applied electromagnetic fields, but upon cooling, transitions to laminar flow. Additionally, cases exist in which the flow is fully turbulent over the range of interest and valid measurements using the oscillating drop method are not possible. During the design phase of the experiment, the experimental parameters should be modeled to characterize the flow behavior and ensure a clean experiment.

24

KRESTIN, Evgenyi A. "THE ISSUE OF PULSATING FLOW IN THE SLIT OF VARIABLE HEIGHT CLEARANCES." Urban construction and architecture 6, no. 2 (June 15, 2016): 48–55. http://dx.doi.org/10.17673/vestnik.2016.02.10.

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Dynamic liquid layer is obtained in the gap of variable height. It is found total solution as the sum of the discharge currents with a constant pressure drop and oscillating components: Differential pressure pulsation and wall vibrations. The formulas for fluid pulsation rate limiting cases are obtained. The article identifies border of quasistationary model of viscous fluid from the fluid changes the dimensionless frequency of oscillations in a slot gap.

25

Grigor’ev, A. I., N. Yu Kolbneva, and S. O. Shiryaeva. "Dynamic Surface Tension of a Charged Spherical Water Drop." Elektronnaya Obrabotka Materialov 59, no. 6 (December 2023): 41–49. http://dx.doi.org/10.52577/eom.2023.59.6.41.

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In the asymptotic calculations of the first order of smallness by the dimensionless amplitude of oscillations of the water drop, the effect of the dynamic surface tension on the parameters of oscillations was investigated on the model of an ideal uncompressible liquid. It was shown that the effect of the dynamic surface tension is significantly manifested at the frequencies of the external influence of the order inverse to the water relaxation time. At such frequencies, under the influence of the external influences, the double electric layer is destroyed (there is a violation of the order of water molecules in the near-surface layer), the free energy of the surface increases, and, with it, the value of the surface tension of the liquid. The dynamic surface tension affects the acoustic radiation from the droplet through a change in the value of the surface tension coefficient. The contribution to electromagnetic radiation of the oscillating droplet is associated with the destruction of the ordering of the near-surface water molecules in the double electric layer.

26

Lu, Liang, Shirang Long, and Kangwu Zhu. "A Numerical Research on Vortex Street Flow Oscillation in the Double Flapper Nozzle Servo Valve." Processes 7, no. 10 (October 11, 2019): 721. http://dx.doi.org/10.3390/pr7100721.

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The oscillating flow field of the double nozzle flapper servo valve pre-stage is numerically analyzed through Large Eddy Simulation (LES) turbulent modeling with the previous grid independence verification. The vortex street flow phenomenon can be observed when the flow passes through the nozzle flapper channel, the vortex alternating in each side produces the periodical flow oscillation. The structural and flow parameter effects on the oscillating flow are emphasized, and it could be determined that the pressure on the flapper is nearly proportional to the flow velocity and inversely proportional to the actual distance between the flapper and the nozzle. On the other hand, the main frequency of oscillation decreases with the velocity and increases with the distance between the nozzle flapper. The main stage movement is further considered with a User Defined Function (UDF), and it could be determined that the influences of the structural and flow parameters on the flow oscillation are rarely changed, but the main frequencies drop, generally.

27

Marquez, Ronald, Johnny Bullon, Ana Forgiarini, and Jean-Louis Salager. "The Oscillatory Spinning Drop Technique. An Innovative Method to Measure Dilational Interfacial Rheological Properties of Crude Oil-Brine Systems in the Presence of Asphaltenes." Colloids and Interfaces 5, no. 3 (August 4, 2021): 42. http://dx.doi.org/10.3390/colloids5030042.

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The oscillatory spinning drop method has been proven recently to be an accurate technique to measure dilational interfacial rheological properties. It is the only available equipment for measuring dilational moduli in low interfacial tension systems, as it is the case in applications dealing with surfactant-oil-water three-phase behavior like enhanced oil recovery, crude oil dehydration, or extreme microemulsion solubilization. Different systems can be studied, bubble-in-liquid, oil-in-water, microemulsion-in-water, oil-in-microemulsion, and systems with the presence of complex natural surfactants like asphaltene aggregates or particles. The technique allows studying the characteristics and properties of water/oil interfaces, particularly when the oil contains asphaltenes and when surfactants are present. In this work, we present a review of the measurements of crude oil-brine interfaces with the oscillating spinning drop technique. The review is divided into four sections. First, an introduction on the oscillating spinning drop technique, fundamental and applied concepts are presented. The three sections that follow are divided according to the complexity of the systems measured with the oscillating spinning drop, starting with simple surfactant-oil-water systems. Then the complexity increases, presenting interfacial rheology properties of crude oil-brine systems, and finally, more complex surfactant-crude oil-brine systems are reviewed. We have found that using the oscillating spinning drop method to measure interfacial rheology properties can help make precise measurements in a reasonable amount of time. This is of significance when systems with long equilibration times, e.g., asphaltene or high molecular weight surfactant-containing systems are measured, or with systems formulated with a demulsifier which is generally associated with low interfacial tension.

28

Ebo-Adou, A., L. S. Tuckerman, S. Shin, J. Chergui, and D. Juric. "Faraday instability on a sphere: numerical simulation." Journal of Fluid Mechanics 870 (May 10, 2019): 433–59. http://dx.doi.org/10.1017/jfm.2019.252.

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We consider a spherical variant of the Faraday problem, in which a spherical drop is subjected to a time-periodic body force, as well as surface tension. We use a full three-dimensional parallel front-tracking code to calculate the interface motion of the parametrically forced oscillating viscous drop, as well as the velocity field inside and outside the drop. Forcing frequencies are chosen so as to excite spherical harmonic wavenumbers ranging from 1 to 6. We excite gravity waves for wavenumbers 1 and 2 and observe translational and oblate–prolate oscillation, respectively. For wavenumbers 3 to 6, we excite capillary waves and observe patterns analogous to the Platonic solids. For low viscosity, both subharmonic and harmonic responses are accessible. The patterns arising in each case are interpreted in the context of the theory of pattern formation with spherical symmetry.

29

Bober, David B., and Chuan-Hua Chen. "Pulsating electrohydrodynamic cone-jets: from choked jet to oscillating cone." Journal of Fluid Mechanics 689 (November 14, 2011): 552–63. http://dx.doi.org/10.1017/jfm.2011.453.

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AbstractPulsating cone-jets occur in a variety of electrostatic spraying and printing systems. This paper reports an experimental study of the pulsation frequency to reconcile two models based on a choked jet and an oscillating cone, respectively. The two regimes are demarcated by the ratio of the supplied flow rate (${Q}_{s} $) to the minimum flow rate (${Q}_{m} $) required for a steady Taylor cone-jet. When ${Q}_{s} \lesssim {Q}_{m} $, the electrohydrodynamic flow is choked at the nozzle because the intermittent jet, when on, emits mass at the minimum flow rate; the pulsation frequency in the choked jet regime is proportional to ${Q}_{s} / {Q}_{m} $. When ${Q}_{s} \gtrsim {Q}_{m} $, the Taylor cone anchored at the nozzle experiences a capillary oscillation analogous to the Rayleigh mode of a free drop; the pulsation frequency in the oscillating cone regime plateaus to the capillary oscillation frequency, which is independent of ${Q}_{s} / {Q}_{m} $.

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Beckers, Mitja, Marc Engelhardt, and Stephan Schneider. "Contactless measurement of temperaturedependent viscosity and surface tension of liquid Al69.1Cu12.8Ag18.1 eutectic alloy under microgravity conditions using the oscillating-drop-method." High Temperatures-High Pressures 50, no. 3 (2021): 167–84. http://dx.doi.org/10.32908/hthp.v50.1031.

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Thermophysical properties of the Al69.1Cu12.8Ag18.1 eutectic liquid alloy are of particular interest for support of self-and inter-diffusion studies. In the presented work, Al69.1Cu12.8Ag18.1-samples were processed contactlessly by electromagnetic levitation under microgravity conditions using the TEMPUS facility. The measurements were performed onboard the Airbus A310 Zero-G in parabolic flight campaigns. The oscillating-drop-method (ODM) was used for measurements of the viscosity via oscillations damping and surface tension via oscillations frequency. These were determined for temperatures in the range of 900–1500 K by analysis of the oscillation spectrum obtained from the electrical impedance. The latter was measured using the Sample Coupling Electronics. An Arrhenius-law η(T) ∝η∞ exp(Eη /RT) was used to fit the temperature-dependent viscosity data. The resulting fit parameters were η∞ = (0.632±0.160) mPas and activation energy of viscous flow Eη = (2.344±0.233) · 104 J/mol. A linear law γ(T) = γl + γT (T - Tm) was fit to the surface tension data yielding γl = (0.9013±0.02625) Nm−1 and γT = −(0.7462±0.2675)·10−4 Nm−1 K−1. The Kozlov-model was applied to determine the enthalphy of mixing as ΔHmix = -(18.576±0.018)kJ/mol.

31

Grigor’ev, A. I., N. Yu Kolbneva, and S. O. Shiryaeva. "Radiation of electromagnetic waves of an oscillating charged drop." Surface Engineering and Applied Electrochemistry 51, no. 6 (November 2015): 530–39. http://dx.doi.org/10.3103/s1068375515060071.

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32

Gaibov, A. R., S. O. Shiryaeva, A. I. Grigor’ev, and D. F. Belonozhko. "Centrosymmetric acoustic emission from a nonlinearly oscillating charged drop." Technical Physics Letters 29, no. 2 (February 2003): 138–40. http://dx.doi.org/10.1134/1.1558749.

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33

Grigor’ev, A. I., S. O. Shiryaeva, A. R. Gaibov, and D. F. Belonozhko. "The acoustic emission from a nonlinearly oscillating charged drop." Technical Physics Letters 27, no. 11 (November 2001): 934–36. http://dx.doi.org/10.1134/1.1424398.

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34

Lyubimov, Dmitry V., Tatyana P. Lyubimova, and Sergey V. Shklyaev. "Behavior of a drop on an oscillating solid plate." Physics of Fluids 18, no. 1 (January 2006): 012101. http://dx.doi.org/10.1063/1.2137358.

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35

Korenchenko, A. E., and V. P. Beskachko. "Behavior of liquid drop situated between two oscillating planes." Journal of Physics: Conference Series 98, no. 6 (February 1, 2008): 062027. http://dx.doi.org/10.1088/1742-6596/98/6/062027.

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36

PRIEDE, JĀNIS. "Oscillations of weakly viscous conducting liquid drops in a strong magnetic field." Journal of Fluid Mechanics 671 (February 10, 2011): 399–416. http://dx.doi.org/10.1017/s0022112010005781.

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We analyse small-amplitude oscillations of a weakly viscous electrically conducting liquid drop in a strong uniform DC magnetic field. An asymptotic solution is obtained showing that the magnetic field does not affect the shape eigenmodes, which remain the spherical harmonics as in the non-magnetic case. A strong magnetic field, however, constrains the liquid flow associated with the oscillations and, thus, reduces the oscillation frequencies by increasing effective inertia of the liquid. In such a field, liquid oscillates in a two-dimensional (2D) way as solid columns aligned with the field. Two types of oscillations are possible: longitudinal and transversal to the field. Such oscillations are weakly damped by a strong magnetic field – the stronger the field, the weaker the damping, except for the axisymmetric transversal and inherently 2D modes. The former are overdamped because of being incompatible with the incompressibility constraint, whereas the latter are not affected at all because of being naturally invariant along the field. Since the magnetic damping for all other modes decreases inversely with the square of the field strength, viscous damping may become important in a sufficiently strong magnetic field. The viscous damping is found analytically by a simple energy dissipation approach which is shown for the longitudinal modes to be equivalent to a much more complicated eigenvalue perturbation technique. This study provides a theoretical basis for the development of new measurement methods of surface tension, viscosity and the electrical conductivity of liquid metals using the oscillating drop technique in a strong superimposed DC magnetic field.

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Vinet, B., S. Schneider, J. P. Garandet, B. Marie, B. Drevet, and I. Egry. "Surface Tension Measurements on CMSX-4 Superalloy by the Drop-Weight and Oscillating-Drop Methods." International Journal of Thermophysics 25, no. 6 (November 2004): 1889–903. http://dx.doi.org/10.1007/s10765-004-7743-4.

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38

Zubarev, Andrey Yu, Dmitry Chirikov, Anton Musikhin, Maxime Raboisson-Michel, Gregory Verger-Dubois, and Pavel Kuzhir. "Nonlinear theory of macroscopic flow induced in a drop of ferrofluid." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2205 (July 19, 2021): 20200323. http://dx.doi.org/10.1098/rsta.2020.0323.

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We present results of theoretical modelling of macroscopic circulating flow induced in a cloud of ferrofluid by an oscillating magnetic field. The cloud is placed in a cylindrical channel filled by a nonmagnetic liquid. The aim of this work is the development of a scientific basis for a progressive method of addressing drug delivery to thrombus clots in blood vessels with the help of the magnetically induced circulation flow. Our results show that the oscillating field can induce, inside and near the cloud, specific circulating flows with the velocity amplitude about several millimetres per second. These flows can significantly increase the rate of transport of the molecular non-magnetic impurity in the channel. This article is part of the theme issue ‘Transport phenomena in complex systems (part 1)’.

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Kovalchuk, V. I., J. Krägel, R. Miller, V. B. Fainerman, N. M. Kovalchuk, E. K. Zholkovskij, R. Wüstneck, and S. S. Dukhin. "Effect of the Nonstationary Viscous Flow in the Capillary on Oscillating Bubble and Oscillating Drop Measurements." Journal of Colloid and Interface Science 232, no. 1 (December 2000): 25–32. http://dx.doi.org/10.1006/jcis.2000.7181.

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40

Iliuta, Ion, and Faïçal Larachi. "Modeling and Simulations of NOx and SO2 Seawater Scrubbing in Packed-Bed Columns for Marine Applications." Catalysts 9, no. 6 (May 28, 2019): 489. http://dx.doi.org/10.3390/catal9060489.

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Seawater scrubbing of nitrogen oxides and sulfur oxide from marine emissions was simulated in packed-bed columns exposed to static inclination and heaving/oscillating motions. Fourth generation random packings (Raschig super-Rings) while providing much smaller pressure drop than traditional Pall-Rings ensure comparable absorption efficiency for the pollutants. Complete removal of SO2 was predicted over the tested pressure range with absorption efficiency indifferent to scrubber inclination or heaving/oscillating motions. In contrast, NOx and CO2 absorptions are negatively impacted for inclined seawater scrubbers. Removal efficiency is not lowered significantly owing to larger scrubber pressure and because diffusion of N2O4 into the liquid phase is associated with a rapid pseudo first-order reaction. The asymmetrical oscillating motion of the scrubber degrades the removal performance which exhibits wavy patterns close to the steady-state solution of the average inclination angle. NO and CO2 absorption performance waves are moving toward a steady-state solution of vertical scrubber when the asymmetry of the two inclined positions of the scrubber downgrades. Symmetric oscillation and heaving motion led to performance disturbance waves around a steady-state solution of the vertical scrubber which are determined by the parameters of angular/heaving motion.

41

Heintzmann, P., F. Yang, S. Schneider, G. Lohöfer, and A. Meyer. "Viscosity measurements of metallic melts using the oscillating drop technique." Applied Physics Letters 108, no. 24 (June 13, 2016): 241908. http://dx.doi.org/10.1063/1.4953871.

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42

Korenchenko, A. E., and J. P. Malkova. "Numerical investigation of phase relationships in an oscillating sessile drop." Physics of Fluids 27, no. 10 (October 2015): 102104. http://dx.doi.org/10.1063/1.4932650.

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43

Fujii, Hidetoshi, Taihei Matsumoto, Shun Izutani, Shoji Kiguchi, and Kiyoshi Nogi. "Surface tension of molten silicon measured by microgravity oscillating drop method and improved sessile drop method." Acta Materialia 54, no. 5 (March 2006): 1221–25. http://dx.doi.org/10.1016/j.actamat.2005.10.058.

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44

Wang, Ce, Xulong Cao, Yangwen Zhu, Zhicheng Xu, Qingtao Gong, Lei Zhang, Lu Zhang, and Sui Zhao. "Interfacial rheological behaviors of inclusion complexes of cyclodextrin and alkanes." Soft Matter 13, no. 45 (2017): 8636–43. http://dx.doi.org/10.1039/c7sm02025b.

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The transformation of cyclodextrins (CDs) and alkanes from separated monomers to inclusion complexes at the interface is illustrated by analyzing the evolution of interfacial tension along with the variation of interfacial area for an oscillating drop.

45

Kungurtsev, Petr V., and Matthew P. Juniper. "Adjoint-based shape optimization of the microchannels in an inkjet printhead." Journal of Fluid Mechanics 871 (May 17, 2019): 113–38. http://dx.doi.org/10.1017/jfm.2019.271.

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In drop-on-demand inkjet printheads, ink is pumped steadily through small channels, each of which contains an actuator and a nozzle. When an actuator pulses, a droplet is forced through the nozzle, after which acoustic oscillations reverberate within the channel. Manufacturers would like to damp the residual reverberations, without increasing the pressure drop required to drive the steady flow. In this paper we use gradient-based optimization to show that this can be achieved by constricting the channel where the acoustic velocity is largest and enlarging the channel where the acoustic velocity is smallest. This increases the viscothermal dissipation of the acoustics without changing the viscous dissipation of the steady flow. We separate the compressible Navier–Stokes equations into equations for a steady flow with no oscillations and equations for oscillations with no steady flow. We define two objective functions: the viscous dissipation of the steady flow and the dissipation of the oscillations. We then derive the adjoints for both sets of equations, and obtain expressions for the gradient of each objective function with respect to boundary deformations in Hadamard form. We combine these with a gradient-based optimization algorithm, incorporating constraints such as the shapes of the actuator and nozzle. This algorithm quickly converges to a design that has the same viscous dissipation for the steady flow but a 50 % larger decay rate for the oscillating flow. We show that this design is nearly optimal. It is a shape that inkjet manufacturers, using physical insight and trial and error, have probably not yet considered. We also show how the adjoint fields provide physical insight into the mechanisms affecting each objective function. The main requirements of this method are that the steady flow Mach number and oscillating flow Mach number are small, and that dissipation is dominated by thermoviscous mechanisms. These requirements are often satisfied in microfluidics, so the method in this paper could be applied to many other applications.

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Prokhorov, V. E. "Acoustics of oscillating bubbles when a drop hits the water surface." Physics of Fluids 33, no. 8 (August 2021): 083314. http://dx.doi.org/10.1063/5.0058582.

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47

Chu, Hong-Yu, Hsiang-Ting Fei, and Chang-Rong Ko. "One-dimensional wave-propelled bouncing drop on an oscillating liquid bath." Physics of Fluids 25, no. 4 (April 2013): 042101. http://dx.doi.org/10.1063/1.4798613.

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48

Kalinitchenko, V. A., and S. Ya Sekerj-Zenkovitch. "On the immiscible fluid displacement in capillary under oscillating pressure drop." Experimental Thermal and Fluid Science 18, no. 3 (November 1998): 244–50. http://dx.doi.org/10.1016/s0894-1777(98)10024-9.

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49

Shiryaeva, S. O., N. Yu Kolbneva, A. I. Grigor’ev, and T. K. Artemova. "Electromagnetic radiation of an uncharged drop oscillating in an electrostatic field." Technical Physics 60, no. 4 (April 2015): 497–504. http://dx.doi.org/10.1134/s1063784215040271.

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50

Li, Xiaoyi, and Kausik Sarkar. "Drop dynamics in an oscillating extensional flow at finite Reynolds numbers." Physics of Fluids 17, no. 2 (February 2005): 027103. http://dx.doi.org/10.1063/1.1844471.

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