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Artykuły w czasopismach na temat „Liquid film flow over complex surface”

Autor: Grafiati

Data publikacji: 12 października 2024

Data aktualizacji: 31 lipca 2025

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1

Pavlenko, Aleksandr, Oleg Volodin, and Vladimir Serdyukov. "The Features Of The Film Flow Of Liquid Nitrogen Over The Structured Surfaces." Siberian Journal of Physics 10, no. 1 (2015): 33–41. http://dx.doi.org/10.54362/1818-7919-2015-10-1-33-41.

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Experimental results on hydrodynamics of cryogenic liquid film flow over the surface of the single elements of the structured packing are presented. Based on the comparison of experimental data, the effect of microtexture and perforation on the zones of liquid film spreading over a corrugated surface is shown for different values of the film Reynolds number. The results of experiments on dependence of a relative portion of liquid held in a single irrigated channel of the corrugated plates with different thicknesses on irrigation degree are presented. It is shown that microtexture, its directio

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2

Pavlenko, Aleksandr, Oleg Volodin, and Vladimir Serdyukov. "Effect Of The Rib Inclination Angle On Liquid Film Spreading Over The Structured Surface." Siberian Journal of Physics 10, no. 1 (2015): 42–49. http://dx.doi.org/10.54362/1818-7919-2015-10-1-42-49.

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Results of experimental studies on hydrodynamics of the film flow of liquid nitrogen over the surface of the single elements of structured packing are presented. The effect of inclination angle of the large ribs and perforation on the zones of liquid film spreading over the corrugated surface with microtexture at different Reynolds numbers of the film is shown based on a comparison of experimental data. It is shown that the angle of large rib inclination has a significant influence on redistribution of the local flow rate of liquid flowing on the surface with complex geometry. Analysis of resu

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3

Dressaire, Emilie, Laurent Courbin, Adrian Delancy, Marcus Roper, and Howard A. Stone. "Study of polygonal water bells: inertia-dominated thin-film flows over microtextured surfaces." Journal of Fluid Mechanics 721 (March 13, 2013): 46–57. http://dx.doi.org/10.1017/jfm.2013.60.

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AbstractMicrotextured surfaces are commonly used to study complex hydrodynamic phenomena such as spreading and splashing of liquid droplets. However, although surface topography is known to modify near-surface flow, there is no theory able to quantitatively predict the dramatic changes in dynamics of liquid spreading and splashing. Here, we investigate experimentally water bells formed on micropatterned surfaces in order to characterize the hydrodynamics of inertia-dominated flows through regular porous layers. Water bells are self-suspended catenary-shaped liquid films created when a jet impi

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4

Penn, David G., Martin Lopez de Bertodano, Paul S. Lykoudis, and Stephen G. Beus. "Dry Patch Stability of Shear Driven Liquid Films." Journal of Fluids Engineering 123, no. 4 (2001): 857–62. http://dx.doi.org/10.1115/1.1412459.

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The breakdown of the liquid film at the wall in annular gas-liquid flow may lead to the formation of a stable dry patch. For the case of heat transfer surfaces this causes a hot spot. Dry patch stability depends on a balance of body and surface forces. In the present study the film is driven by the interfacial shear force and the gravity force is negligible. Hartley and Murgatroyd proposed a model for dry patches of shear driven films based on a balance of surface tension and inertia but the film contact angle had to be adjusted to an unrealistic value to fit the model to experimental data. Mu

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5

Silva, F. O., I. R. Siqueira, M. S. Carvalho, and R. L. Thompson. "Slot coating flows with a Boussinesq–Scriven viscous interface." Physics of Fluids 35, no. 4 (2023): 042106. http://dx.doi.org/10.1063/5.0147030.

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We present a computational study of free surface flows with rheologically complex interfaces in the film formation region of a slot coater. The equations of motion for incompressible Newtonian liquids in the bulk flow are coupled with the Boussinesq–Scriven constitutive equation for viscous interfaces in the dynamic boundary condition at the liquid-air free surface and solved with a mixed finite element method. We show that the interfacial viscosity plays a major role in the flow dynamics and operating limits of slot coating. We find that the interfacial viscosity makes viscous interfaces gene

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6

Pavlenko, Aleksandr, Anton Surtaev, Oleg Volodin, and Vladimir Serdyukov. "Distribution Of Liquid Nitrogen At The Film Flow In The Single Elements Of The Structured Packing." Siberian Journal of Physics 11, no. 2 (2016): 12–20. http://dx.doi.org/10.54362/1818-7919-2016-11-2-12-20.

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Experimental results on the parameters of the film flow of cryogenic liquid over the surface of single elements of the structured packing consisting of two corrugated plates are presented. The effect of microtexture and its direction relative to the direction of gravity on liquid distribution along the packing at different irrigation degrees is shown based on the comparison with experimental data. Experimental results on the degree of liquid flowing through the contact points in the packing with plates are presented relative to the irrigation degree. It is shown that microtexture and its direc

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7

Shmyrov, Andrey. "Thermo-capillary flow in a Hele-Show cell as a tool for research of the dynamics of insoluble surfactant monolayer." EPJ Web of Conferences 213 (2019): 02073. http://dx.doi.org/10.1051/epjconf/201921302073.

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The occurrence of thermocapillary convection in a Hele-Shaw cell in the presence of the surfactant film on the free surface is experimentally investigated. It is shown that at certain values of the control parameter two different zones are formed on the surface – the zone free from impurities and the stagnant zone. In the first zone, the onset and development of an intense Marangoni convection is observed, while in the stagnant zone the velocity of the motion on the surface is lower by about two orders of magnitude. This study clearly demonstrates that the analysis of the temperature profile p

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8

Dietze, Georg F., W. Rohlfs, K. Nährich, R. Kneer, and B. Scheid. "Three-dimensional flow structures in laminar falling liquid films." Journal of Fluid Mechanics 743 (March 4, 2014): 75–123. http://dx.doi.org/10.1017/jfm.2013.679.

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AbstractFull numerical simulations of the Navier–Stokes equations for four cases of vertically falling liquid films with three-dimensional surface waves have been performed. Flow conditions are based on several previous experimental studies where the streamwise and spanwise wavelengths were imposed, which we exploit by simulating periodic wave segments. The considered flows are laminar but approach conditions at which intermittent wave-induced turbulence has been observed elsewhere. Working liquids range from water to silicone oil and cover a large interval of the Kapitza number ($\textit {Ka}

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9

Belmiloud, Naser. "Characterizing Turbulence and Wave Dynamics Under Rotation: Enhancing Semiconductor Processes through CFD Analysis and High-Speed Imaging." ECS Meeting Abstracts MA2024-02, no. 31 (2024): 2278. https://doi.org/10.1149/ma2024-02312278mtgabs.

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Introduction In semiconductor manufacturing, precision in wafer processing is crucial for advancing device technology. The spinning system, essential for wafer cleaning and etching, significantly impacts device quality by facilitating dynamic air-liquid interactions, affecting surface chemistry. This study utilizes Computational Fluid Dynamics (CFD) and high-speed camera analysis to explore turbulence and wave dynamics, confronting Fast Fourier Transform (FFT) analysis against the Kolmogorov cascade to improve manufacturing outcomes by understanding these dynamics more thoroughly. Experimental

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10

Cuccia, Nicholas L., Suraj Pothineni, Brady Wu, Joshua Méndez Harper, and Justin C. Burton. "Pore-size dependence and slow relaxation of hydrogel friction on smooth surfaces." Proceedings of the National Academy of Sciences 117, no. 21 (2020): 11247–56. http://dx.doi.org/10.1073/pnas.1922364117.

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Hydrogels consist of a cross-linked polymer matrix imbibed with a solvent such as water at volume fractions that can exceed 90%. They are important in many scientific and engineering applications due to their tunable physiochemical properties, biocompatibility, and ultralow friction. Their multiphase structure leads to a complex interfacial rheology, yet a detailed, microscopic understanding of hydrogel friction is still emerging. Using a custom-built tribometer, here we identify three distinct regimes of frictional behavior for polyacrylic acid (PAA), polyacrylamide (PAAm), and agarose hydrog

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11

Aidun, Cyrus K. "Mechanics of a Free-Surface Liquid Film Flow." Journal of Applied Mechanics 54, no. 4 (1987): 951–54. http://dx.doi.org/10.1115/1.3173144.

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The mechanics of a free surface viscous liquid curtain flowing steadily between two vertical guide wires under the influence of gravity is investigated. The Navier-Stokes equation is integrated over the film thickness and an integro-differential equation is derived for the average film velocity. An approximate nonlinear differential equation, attributed to G. I. Taylor, is obtained by neglecting the higher order terms. An analytical solution is obtained for a similar equation which neglects the surface tension effects and the results are compared with the experimental measurements of Brown (19

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12

SREENIVAS, K. R., P. K. DE, and JAYWANT H. ARAKERI. "Levitation of a drop over a film flow." Journal of Fluid Mechanics 380 (February 10, 1999): 297–307. http://dx.doi.org/10.1017/s0022112098003486.

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A vertical jet of water impinging on a horizontal surface produces a radial film flow followed by a circular hydraulic jump. We report a phenomenon where fairly large (1 ml) drops of liquid levitate just upstream of the jump on a thin air layer between the drop and the film flow. We explain the phenomenon using lubrication theory. Bearing action both in the air film and the water film seems to be necessary to support large drops. Horizontal support is given to the drop by the hydraulic jump. A variety of drop shapes is observed depending on the volume of the drop and liquid properties. We show

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13

Peng, X. F., and G. P. Peterson. "Analysis of Rewetting for Surface Tension Induced Flow." Journal of Heat Transfer 114, no. 3 (1992): 703–7. http://dx.doi.org/10.1115/1.2911337.

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An analytical investigation was conducted to determine the rewetting characteristics of thin, surface tension driven liquid films over heated plates as a function of the fluid properties, the film thickness, and the applied heat flux. Analytical expressions for the maximum sustainable heat flux and the rewetting velocity were developed for both flat and grooved plates and were compared with data from previous investigations. The results indicated good agreement for low film velocities; however, at high velocities the experimental data deviated significantly from the theoretical predictions. It

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14

TSELUIKO, D., M. G. BLYTH, D. T. PAPAGEORGIOU, and J. M. VANDEN-BROECK. "Electrified viscous thin film flow over topography." Journal of Fluid Mechanics 597 (February 1, 2008): 449–75. http://dx.doi.org/10.1017/s002211200700986x.

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The gravity-driven flow of a liquid film down an inclined wall with periodic indentations in the presence of a normal electric field is investigated. The film is assumed to be a perfect conductor, and the bounding region of air above the film is taken to be a perfect dielectric. In particular, the interaction between the electric field and the topography is examined by predicting the shape of the film surface under steady conditions. A nonlinear, non-local evolution equation for the thickness of the liquid film is derived using a long-wave asymptotic analysis. Steady solutions are computed for

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15

Zama, Yoshio, Hiroyasu Eriguchi, and Tomohiko Furuhata. "Effect Of Wavy Structure Of Liquid Film On Flow Characteristics Of Impingement Jet Flowing On Fuel Liquid Film." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 21 (July 8, 2024): 1–12. http://dx.doi.org/10.55037/lxlaser.21st.104.

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In recent years, diesel engines have been downsized in order to improve combustion efficiency by using high-pressure injection to atomize the fuel and to increase fuel economy. As a result, the diesel spray flame inevitably impinges on the combustion chamber wall, resulting in heat loss due to heat transfer between the flame and the wall. According to Newton's cooling law, the heat transferred from the flame to the wall is proportional to the heat transfer coefficient, which is closely related to the flow of the spray flame. However, there are few reports on the flow of a spray flame impinging

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16

Suzzi, Nicola, and Giulio Croce. "Numerical simulation of film instability over a corrugated sheet." Journal of Physics: Conference Series 2940, no. 1 (2025): 012010. https://doi.org/10.1088/1742-6596/2940/1/012010.

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Abstract The evolution of a liquid layer flowing down a corrugated sheet driven by gravity, which is the characteristic configuration of structured packing, is numerically analysed via the solution of the governing lubrication equation, which reduces the 3D physical problem to a 2D mathematical problem. Disjoining pressure is used to model contact line dynamics and surface wettability, while full implementation of capillary pressure allows to investigate contact angles up to 60°. The effect of corrugation is introduced via the definition, in the governing lubrication equation, of non-uniform g

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17

Pavlenko, Aleksandr, Anton Surtaev, Oleg Volodin, and Vladimir Serdyukov. "The Features Of The Film Flow Of Liquid Nitrogen Over The Corrugated Plates With Combined Microtexture." Siberian Journal of Physics 12, no. 2 (2017): 75–84. http://dx.doi.org/10.54362/1818-7919-2017-12-2-75-84.

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Experimental results on hydrodynamics of cryogenic liquid film flow over the surface of the single elements of the structured packing are presented. Based on the comparison of experimental data, the effect of microtexture form, diameter of the holes on the zones of liquid film spreading over a corrugated surface is shown for different values of the film Reynolds number. It is shown that the presence of combined microtexture (with the periodic change in its direction at the height of the sheet) leads to a better spreading of the liquid nitrogen film on the surface of the corrugated perforated s

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18

Xue, Danting, Ruigang Zhang, Quansheng Liu, and Zhaodong Ding. "Instability of Liquid Film with Odd Viscosity over a Non-Uniformly Heated and Corrugated Substrate." Nanomaterials 13, no. 19 (2023): 2660. http://dx.doi.org/10.3390/nano13192660.

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The effect of odd viscosity on the instability of liquid film along a wavy inclined bottom with linear temperature variation is investigated. By utilizing the long-wave approximation, the non-linear evolution equation of the free surface is derived. By applying the normal mode method, the linear instability of thin film flow is investigated. With the help of multi-scale analysis methods, the weakly non-linear instability of thin film flow is also investigated. The results reveal that the Marangoni effect caused by non-uniform temperature distribution promotes the instability of the liquid film

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19

Ovcharova, A. S. "Controlling the Free-Surface Profile of Film Flow over Complex Topography." Journal of Applied Mechanics and Technical Physics 45, no. 4 (2004): 523–27. http://dx.doi.org/10.1023/b:jamt.0000030329.01002.32.

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20

Ozar, B., B. M. Cetegen, and A. Faghri. "Experiments on Heat Transfer in a Thin Liquid Film Flowing Over a Rotating Disk." Journal of Heat Transfer 126, no. 2 (2004): 184–92. http://dx.doi.org/10.1115/1.1652044.

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An experimental study of heat transfer into a thin liquid film on a rotating heated disk is described. Deionized water was introduced at the center of a heated, horizontal disk with a constant film thickness and uniform radial velocity. Radial distribution of the disk surface temperatures was measured using a thermocouple/slip ring arrangement. Experiments were performed for a range of liquid flow rates between 3.0 lpm and 15.0 lpm. The angular speed of the disk was varied from 0 rpm to 500 rpm. The local heat transfer coefficient was determined based on the heat flux supplied to the disk and

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21

Chang, K. H., and L. C. Witte. "Liquid-Solid Contact During Flow Film Boiling of Subcooled Freon-11." Journal of Heat Transfer 112, no. 2 (1990): 465–71. http://dx.doi.org/10.1115/1.2910401.

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Liquid-solid contacts were measured for flow film boiling of subcooled Freon-11 over an electrically heated cylinder equipped with a surface microthermocouple probe. No systematic variation of the extent of liquid-solid contact with wall superheat, liquid subcooling, or velocity was detected. Only random small-scale contacts that contribute negligibly to overall heat transfer were detected when the surface was above the homogeneous nucleation temperature of the Freon-11. When large-scale contacts were detected, they led to an unexpected intermediate transition from local film boiling to local

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22

Mamedov, Asiman, Serhiy Stas, and Evhen Lavrukhin. "FEATURES OF THE FILM FLOW OF A LIQUID OVER A VERTICAL SURFACE IN A TRANSVERSE MAGNETIC FIELD." Bulletin of the National Technical University "KhPI". Series: Hydraulic machines and hydraulic units, no. 2 (January 24, 2024): 44–48. http://dx.doi.org/10.20998/2411-3441.2023.2.06.

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One of the actual problems of magnetohydrodynamics is the problem of the flow of electrically conductive liquids in thin liquid layers in the presence of a transverse magnetic field. Unfortunately, studies of these problems have not been sufficient so far. The influence of a transverse magnetic field can affect a number of factors: the change in the viscosity of the flow due to the magnetic field on the physico-chemical characteristics of the medium; manifestation of the effect of flow deceleration, which can have a significant effect on the hydrodynamic characteristics of the film flow in the

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23

Pavlenko, Ivan, Oleksandr Liaposhchenko, Marek Ochowiak, et al. "Three-Dimensional Mathematical Model of the Liquid Film Downflow on a Vertical Surface." Energies 13, no. 8 (2020): 1938. http://dx.doi.org/10.3390/en13081938.

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Film downflow from captured liquid without wave formation and its destruction is one of the most important aspects in the development of separation equipment. Consequently, it is necessary to create well-organized liquid draining in areas of captured liquid. Thus, the proposed 3D mathematical model of film downflow allows for the determination of the hydrodynamic parameters of the liquid film flow and the interfacial surface. As a result, it was discovered that the interfacial surface depends on the proposed dimensionless criterion, which includes internal friction stress, channel length, and

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24

Fang, Tiegang, Fujun Wang, and Bo Gao. "Liquid film flow over an unsteady moving surface with a new stretching velocity." Physics of Fluids 30, no. 9 (2018): 093603. http://dx.doi.org/10.1063/1.5046479.

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25

Chen, Ping-Hei, Min-Sheng Hung, and Pei-Pei Ding. "A Transient Method Using Liquid Crystal for Film Cooling Over a Convex surface." International Journal of Rotating Machinery 7, no. 3 (2001): 153–64. http://dx.doi.org/10.1155/s1023621x01000148.

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In order to explore the effect of blowing ratio on film cooling over a convex surface, the present study adopts the transient liquid crystal thermography for the film cooling measurement on a straight circular hole configuration. The test piece has a strength of curvature(2r/D)of 92.5, pitch to diameter ratio(P/D)of 3 and streamwise injection angle(γ)of35∘All measurements were conducted under the mainstream Reynolds number(Red)of 1700 with turbulence intensity(Tu)of 3.8%, and the density ratio between coolant and mainstream(ρc/ρm)is 0.98. In current study, the effect of blowing ratio(M)on film

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26

Rezk, Amgad R., Ofer Manor, Leslie Y. Yeo, and James R. Friend. "Double flow reversal in thin liquid films driven by megahertz-order surface vibration." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2169 (2014): 20130765. http://dx.doi.org/10.1098/rspa.2013.0765.

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Arising from an interplay between capillary, acoustic and intermolecular forces, surface acoustic waves (SAWs) are observed to drive a unique and curious double flow reversal in the spreading of thin films. With a thickness at or less than the submicrometre viscous penetration depth, the film is seen to advance along the SAW propagation direction, and self-similarly over time t 1/4 in the inertial limit. At intermediate film thicknesses, beyond one-fourth the sound wavelength λ ℓ in the liquid, the spreading direction reverses, and the film propagates against the direction of the SAW propagati

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27

Ruschak, Kenneth J., and Steven J. Weinstein. "Thin-Film Flow at Moderate Reynolds Number." Journal of Fluids Engineering 122, no. 4 (2000): 774–78. http://dx.doi.org/10.1115/1.1319499.

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Viscous, laminar, gravitationally-driven flow of a thin film over a round-crested weir is analyzed for moderate Reynolds numbers. A previous analysis of this flow utilized a momentum integral approach with a semiparabolic velocity profile to obtain an equation for the film thickness (Ruschak, K. J., and Weinstein, S. J., 1999, “Viscous Thin-Film Flow Over a Round-Crested Weir,” ASME J. Fluids Eng., 121, pp. 673–677). In this work, a viscous boundary layer is introduced in the manner of Haugen (Haugen, R., 1968, “Laminar Flow Around a Vertical Wall,” ASME J. Appl. Mech. 35, pp. 631–633). As in

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28

Woods, David R., and S. P. Lin. "Instability of a liquid film flow over a vibrating inclined plane." Journal of Fluid Mechanics 294 (July 10, 1995): 391–407. http://dx.doi.org/10.1017/s0022112095002941.

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The problem of the onset of instability in a liquid layer flowing down a vibrating inclined plane is formulated. For the solution of the problem, the Fourier components of the disturbance are expanded in Chebychev polynomials with time-dependent coefficients. The reduced system of ordinary differential equations is analysed with the aid of Floquet theory. The interaction of the long gravity waves, the relatively short shear waves and the parametrically resonated Faraday waves occurring in the film flow is studied. Numerical results show that the long gravity waves can be significantly suppress

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29

Reisfeld, B., and S. G. Bankoff. "Non-isothermal flow of a liquid film on a horizontal cylinder." Journal of Fluid Mechanics 236 (March 1992): 167–96. http://dx.doi.org/10.1017/s0022112092001381.

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We consider the flow of a viscous liquid film on the surface of a cylinder that is heated or cooled. Lubrication theory is used to study a thin film under the influence of gravity, capillary, thermocapillary, and intermolecular forces. We derive evolution equations for the interface shapes as a function of the azimuthal angle about the cylinder that govern the behaviour of the film subject to the above coupled forces. We use both analytical and numerical techniques to elucidate the dynamics and steady states of the thin layer over a wide range of thermal conditions and material properties. Fin

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30

Liu, Xiao Bo, Jian Run Zhang, Pu Li, and Xin Hua Wang. "Analysis and Calculation of Vacuum Film Deaeration for High Viscosity Liquids." Applied Mechanics and Materials 141 (November 2011): 76–82. http://dx.doi.org/10.4028/www.scientific.net/amm.141.76.

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A theoretical analysis of Vacuum Film Deaeration(VFD) based on the characteristics of fluid film on a rotating cone surface is carried out. The motion equation of bubble is derived to find out its relative slip velocity in the flowing film. And the bubbles removal time from the high viscosity liquid is discussed. The thickness model of liquid film on the rotating surface and the residence time of the film flows over the surface are built in this paper. It is found that the thickness and the velocity of the flowing film on the rotating cone surface are the key parameters for VFD; the time of bu

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31

Shahzad, Azeem, Uzma Gulistan, Ramzan Ali, et al. "Numerical Study of Axisymmetric Flow and Heat Transfer in a Liquid Film over an Unsteady Radially Stretching Surface." Mathematical Problems in Engineering 2020 (August 28, 2020): 1–9. http://dx.doi.org/10.1155/2020/6737243.

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The main emphasis on this paper is to analyze the axisymmetric flow and heat transfer in a liquid film over an unsteady radially stretching surface in the presence of a transverse magnetic field. The similarity transformations are used to reduce the highly nonlinear governing partial differential equations for momentum and energy into a set of ordinary differential equations. A numerical scheme is developed for the reduced nonlinear differential equations for the velocity and temperature fields. The literature survey shows that the present problem of thin film flow over a radially stretching s

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32

Xu, Hang, Ioan Pop, and Xiang-Cheng You. "Flow and heat transfer in a nano-liquid film over an unsteady stretching surface." International Journal of Heat and Mass Transfer 60 (May 2013): 646–52. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.01.046.

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Brož, Zdeněk, and Mirko Endršt. "The effect of surface active agents on the mass transfer coefficient in vertical film flow of liquid over the surface of expanded metal sheet packing." Collection of Czechoslovak Chemical Communications 51, no. 2 (1986): 302–13. http://dx.doi.org/10.1135/cccc19860302.

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Experimental data have been used on absorption of poorly soluble gases, helium, carbon dioxide, and propane, to study the mechanism of interfacial mass transfer in vertical gravitational film flow down the surface of the expanded metal sheet. It has been found that upon addition of surface active agents into water, the original almost freely moving liquid-gas interfacial surface behaves similarly as a liquid-solid surface. Two adjustable hydrodynamic parameters have been evaluated on the basis of the film penetration theory with the physical meaning of the dimensionless thickness of an unmixed

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34

Ilie, Marius Ciprian, Ioana Maior, Cristian Eugen Raducanu, Iuliana Mihaela Deleanu, Tanase Dobre, and Oana Cristina Parvulescu. "Experimental Investigation and Modeling of Film Flow Corrosion." Metals 13, no. 8 (2023): 1425. http://dx.doi.org/10.3390/met13081425.

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The paper focuses on the experimental investigation and mathematical modeling of the corrosion of steel when a film of water flows over its surface. The experimental monitoring of corrosion dynamics in the flowing film was carried out using a laboratory pilot model, exploited in such a way as to obtain data necessary to identify some characteristic parameters of the mathematical model of this problem. The mathematical model of the case takes into account the transfer of oxygen through the liquid film flowing on the surface of the corroding plate where the chemical surface processes characteris

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35

Sakhnov, A., O. A. Volodin, N. I. Pecherkin, and A. N. Pavlenko. "Numerical Modelling of Liquid Film Spreading Dynamics over Smooth Vertical Surface under Isothermal Conditions." Journal of Physics: Conference Series 2119, no. 1 (2021): 012054. http://dx.doi.org/10.1088/1742-6596/2119/1/012054.

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Abstract The paper presents numerical modelling of the liquid film spreading dynamics of the R21 (mol. fraction: 0.9) and R114 refrigerants mixture. We considered an outer flow along a round vertical cylinder at Reynolds number of 104 and various contact angles. The simulation was performed in OpenFOAM software on the basis of the volume of fluid (VOF) method. We have shown that the wetting front deforms at wetting angles of 30 and 50 degrees, and regular jets form. At the same time, it was demonstrated that at the wetting angle of 10 degrees the spreading front has practically a flat shape, b

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36

Suzzi, Nicola, and Giulio Croce. "Numerical Bifurcation Analysis of a Film Flowing over a Patterned Surface through Enhanced Lubrication Theory." Fluids 6, no. 11 (2021): 405. http://dx.doi.org/10.3390/fluids6110405.

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The bifurcation analysis of a film falling down an hybrid surface is conducted via the numerical solution of the governing lubrication equation. Instability phenomena, that lead to film breakage and growth of fingers, are induced by multiple contamination spots. Contact angles up to 75∘ are investigated due to the full implementation of the free surface curvature, which replaces the small slope approximation, accurate for film slope lower than 30∘. The dynamic contact angle is first verified with the Hoffman–Voinov–Tanner law in case of a stable film down an inclined plate with uniform surface

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Khan, Abdul Samad, Yufeng Nie, and Zahir Shah. "Impact of Thermal Radiation on Magnetohydrodynamic Unsteady Thin Film Flow of Sisko Fluid over a Stretching Surface." Processes 7, no. 6 (2019): 369. http://dx.doi.org/10.3390/pr7060369.

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The current article discussed the heat transfer and thermal radioactive of the thin liquid flow of Sisko fluid on unsteady stretching sheet with constant magnetic field (MHD). Here the thin liquid fluid flow is assumed in two dimensions. The governing time-dependent equations of Sisko fluid are modeled and reduced to Ordinary differential equations (ODEs) by use of Similarity transformation with unsteadiness non-dimensionless parameter S t . To solve the model problem, we used analytical and numerical techniques. The convergence of the problem has been shown numerically and graphically using H

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Mimouni, S., N. Mechitoua, A. Foissac, M. Hassanaly, and M. Ouraou. "CFD Modeling of Wall Steam Condensation: Two-Phase Flow Approach versus Homogeneous Flow Approach." Science and Technology of Nuclear Installations 2011 (2011): 1–10. http://dx.doi.org/10.1155/2011/941239.

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The present work is focused on the condensation heat transfer that plays a dominant role in many accident scenarios postulated to occur in the containment of nuclear reactors. The study compares a general multiphase approach implemented in NEPTUNE_CFD with a homogeneous model, of widespread use for engineering studies, implemented inCode_Saturne. The model implemented in NEPTUNE_CFD assumes that liquid droplets form along the wall within nucleation sites. Vapor condensation on droplets makes them grow. Once the droplet diameter reaches a critical value, gravitational forces compensate surface

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Dong, Rencheng, Akira Fujita, Derek Bassett, Kazuyoshi Shinohara, Shuhei Takahashi, and Ihsan Simms. "Investigating the Role of Fluid Dynamics on Cut Width Accuracy in Wet Bevel Cleaning Techniques." ECS Meeting Abstracts MA2024-02, no. 31 (2024): 2280. https://doi.org/10.1149/ma2024-02312280mtgabs.

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As the size of advanced technology nodes keeps scaling down, IC manufacturers continue to push the active die area to the wafer edge. Defects originating from the wafer edge can result in substantial yield loss. Etching and cleaning bevel films and particles is increasingly critical in improving wafer yield performance near the wafer edge. Even though backside center dispense spin (BCS) and bevel nozzle dispense spin (BVS) methods have been developed and employed as two main wet bevel cleaning techniques in high volume manufacturing, the comparison of cut width accuracy between different wet b

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Harper, J. F. "The leading edge of an oil slick, soap film, or bubble stagnant cap in Stokes flow." Journal of Fluid Mechanics 237 (April 1992): 23–32. http://dx.doi.org/10.1017/s0022112092003331.

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Trace impurities often collect on the upstream side of an obstacle in the surface of flowing liquid. The transition from practically free surface to surface sufficiently clogged to be treated as stationary can be quite sharp. The viscous flow underneath is nonlinearly coupled to the convective mass transfer of surface-active material. For two-dimensional flow at high Reynolds number the first observations were due to Thoreau, Langton and Reynolds over 100 years ago, and the theory was given by Harper & Dixon in 1974. If the whole problem is considered from a frame of reference moving with

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Suzzi, Nicola, and Giulio Croce. "Numerical simulation of shear driven film instability over heterogeneous surfaces via enhanced lubrication theory." Journal of Physics: Conference Series 2685, no. 1 (2024): 012019. http://dx.doi.org/10.1088/1742-6596/2685/1/012019.

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Abstract The prediction of the transition between continuous film, ensemble of rivulets and moving droplets is crucial in applications such as in-flight icing on airfoil wings or a number of chemical reactors. Here, lubrication theory is used to numerically investigate the stability of a continuous liquid film, driven by shear, over a heterogeneous surface. The disjoining pressure is used to model surface wettability, while the full implementation of the film curvature allows to investigate contact angles up to 60°. Different heterogeneous surface configurations occurring in real problems are

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Jawad, Muhammad, Zahir Shah, Saeed Islam, Waris Khan, and Aurang Zeb Khan. "Nanofluid thin film flow of Sisko fluid and variable heat transfer over an unsteady stretching surface with external magnetic field." Journal of Algorithms & Computational Technology 13 (January 2019): 174830181983245. http://dx.doi.org/10.1177/1748301819832456.

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This research paper investigates two dimensional liquid film flow of Sisko nanofluid with variable heat transmission over an unsteady stretching sheet in the existence of uniform magnetic field. The basic governing time-dependent equations of the nanofluid flow phenomena with Sisko fluid are modeled and reduced to a system of differential equations with use of similarity transformation. The significant influence of Brownian motion and thermophoresis has been taken in the nanofluids model. An optimal approach is used to obtain the solution of the modeled problems. The convergence of the Homotop

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Guo, S. M., C. C. Lai, T. V. Jones, M. L. G. Oldfield, G. D. Lock, and A. J. Rawlinson. "Influence of Surface Roughness on Heat Transfer and Effectiveness for a Fully Film Cooled Nozzle Guide Vane Measured by Wide Band Liquid Crystals and Direct Heat Flux Gages." Journal of Turbomachinery 122, no. 4 (2000): 709–16. http://dx.doi.org/10.1115/1.1312798.

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The influence of surface roughness on heat transfer coefficient and cooling effectiveness for a fully film cooled three-dimensional nozzle guide vane (NGV) has been measured in a transonic annular cascade using wide band liquid crystal and direct heat flux gages (DHFGs). The liquid crystal methods were used for rough surface measurements and the DHFGs were used for the smooth surfaces. The measurements have been made at engine representative Mach and Reynolds numbers and inlet free-stream turbulence intensity. The aerodynamic and thermodynamic characteristics of the coolant flow have been mode

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Sun, Chunhua, Zhi Ning, Xinqi Qiao, et al. "Numerical simulation of gas–liquid flow behavior in the nozzle exit region of an effervescent atomizer." International Journal of Spray and Combustion Dynamics 11 (January 2019): 175682771882159. http://dx.doi.org/10.1177/1756827718821592.

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The pressure drop and particular geometric structure of the nozzle exit region of an effervescent atomizer cause complex changes in the flow pattern, which could affect the spray performance. In this study, the gas–liquid two-phase flow behavior in the nozzle exit region of the effervescent atomizer was investigated numerically. The results show that the flow behaviors in the nozzle exit region have disparate characteristics with different upstream flow regimes. For upstream churn flow, the liquid film morphology is closely related to fluctuation in the gas–liquid velocity, and the flow parame

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45

Basu, S., and B. M. Cetegen. "Effect of Hydraulic Jump on Hydrodynamics and Heat Transfer in a Thin Liquid Film Flowing Over a Rotating Disk Analyzed by Integral Method." Journal of Heat Transfer 129, no. 5 (2006): 657–63. http://dx.doi.org/10.1115/1.2712854.

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Flow and heat transfer in a liquid film flowing over the surface of a rotating disk was analyzed by integral technique. The integral analysis includes the prediction of the hydraulic jump and its effects on heat transfer. The results of this analysis are compared to the earlier results that did not include this effect. At low inlet Reynolds numbers and high Rossby numbers, corresponding to low film inertia and low rotation rates, respectively, a hydraulic jump appears on the disk surface. The location of the jump and the liquid film height at this location are predicted. A scaling analysis of

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Tripathi, R. "Marangoni convection in the transient flow of hybrid nanoliquid thin film over a radially stretching disk." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 235, no. 4 (2021): 800–811. http://dx.doi.org/10.1177/09544089211008052.

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Within a magnetohydrodynamic environment, Marangoni convection (Thermocapilarity effect) in an unsteady thin film of hybrid nanoliquid flow over a disk has been discussed. A set of simplified Navier-Stokes equation using boundary layer theory is written in order to model the above mentioned flow situation. The dissipative effects caused by viscosity and magnetic field have been incorporated in temperature-balance equation. A suitable choice of transform variables facilitate a system of ordinary differential equations (ODEs) from original partial differential equations (PDEs) representing the f

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Panda, Satyananda, Mathieu Sellier, M. C. S. Fernando, and M. K. Abeyratne. "Process Parameter Identification in Thin Film Flows Driven by a Stretching Surface." International Journal of Engineering Mathematics 2014 (July 21, 2014): 1–12. http://dx.doi.org/10.1155/2014/485431.

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The flow of a thin liquid film over a heated stretching surface is considered in this study. Due to a potential nonuniform temperature distribution on the stretching sheet, a temperature gradient occurs in the fluid which produces surface tension gradient at the free surface of the thin film. As a result, the free surface deforms and these deformations are advected by the flow in the stretching direction. This work focuses on the inverse problem of reconstructing the sheet temperature distribution and the sheet stretch rate from observed free surface variations. This work builds on the analysi

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Khan, Waris, Muhammad Idress, Taza Gul, Muhammad Altaf Khan, and Ebenezer Bonyah. "Three non-Newtonian fluids flow considering thin film over an unsteady stretching surface with variable fluid properties." Advances in Mechanical Engineering 10, no. 10 (2018): 168781401880736. http://dx.doi.org/10.1177/1687814018807361.

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This research examines the features of liquid film of non-Newtonian fluids under the influence of thermophoresis. For this study, we proposed a mathematical model for Jeffrey, Maxwell, and Oldroyd-B fluids and concluded the unsteady stretched surface in the existence of a magnetic field and also the thermal conductivity was measured which is directly related to the temperature whereas the viscosity inversely related to the temperature. Inserting the thermophoretic effect which improved the thermal conductivity of Jeffrey fluid over the Oldroyd-B and Maxwell fluids. The model is helpful for the

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Abualnaja, Khadijah M. "Numerical treatment of a physical problem in fluid film flow using the differential transformation method." International Journal of Modern Physics C 31, no. 05 (2020): 2050067. http://dx.doi.org/10.1142/s0129183120500679.

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The problem of thin liquid film flow over a heated horizontal stretching surface permitted by uniform transverse magnetic field in the presence of variable heat flux is studied numerically. The ordinary differential equations describing the physical problem are solved approximately by the differential transformation method (DTM). A study of the convergence analysis of the proposed method is given. The effects of the various parameters governing the thin film flow and heat transfer in this study are discussed and presented graphically. Our paper contributes to the existing literature by introdu

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Shmeliova, Dina V., Sergey V. Pasechnik, Semen S. Kharlamov, et al. "Photo-Induced Relief in Rheology of Liquid Crystals." Symmetry 15, no. 3 (2023): 722. http://dx.doi.org/10.3390/sym15030722.

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In this paper, we report the first experimental results on capillary shear flows of a nematic liquid crystal 5CB (4-cyano-4′-pentylbiphenyl), arising due to interaction of the anisotropic liquid, correspondent to the continuous rotational symmetry, with photo-profiled polymer surfaces. The regular surface relief was obtained due to opto-mechanical deformation of azobenzene containing potoresponsive polymer film (PAZO) during irradiation with two-beam interference. Such surface treatment makes it possible to obtain a regular submicron profile with well-defined characteristics (direction, period

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