S1604-1-3 Three-dimensional deformation analyses of ultra-thin liquid film : Instability phenomena caused by presence of confining solid surface

2009 ◽  
Vol 2009.5 (0) ◽  
pp. 213-214
Author(s):  
Fumihiro SAEKI ◽  
Shigehisa FUKUI ◽  
Hiroshige MATSUOKA
Keyword(s):  
Liquid Film ◽  
Solid Surface ◽  
Thin Liquid Film ◽  
Three Dimensional ◽  
Film Instability

Nanoscale Elastocapillary Effect Induced by Thin-Liquid-Film Instability

2020 ◽  
Vol 11 (7) ◽  
pp. 2751-2758
Author(s):  
Nandi Vrancken ◽  
Tanmay Ghosh ◽  
Utkarsh Anand ◽  
Zainul Aabdin ◽  
See Wee Chee ◽  
...  
Keyword(s):  
Liquid Film ◽  
Thin Liquid Film ◽  
Film Instability

Molecular Dynamics Study on Explosive Boiling of Thin Liquid Argon Film on Nanostructured Surface Under Different Wetting Conditions

2015 ◽  
Author(s):  
Sheikh Mohammad Shavik ◽  
Mohammad Nasim Hasan ◽  
A. K. M. Monjur Morshed
Keyword(s):  
Molecular Dynamics ◽  
Liquid Film ◽  
Solid Surface ◽  
Solid Wall ◽  
Thin Liquid Film ◽  
Liquid Argon ◽  
Spatial And Temporal Variation ◽  
Phase System ◽  
Explosive Boiling ◽  
System Pressure

Molecular dynamics (MD) simulations have been performed to investigate the boiling phenomena of thin liquid film adsorbed on a nanostructured solid surface with particular emphasis on the effect of wetting condition of the solid surface. The molecular system consists of liquid and vapor argon, and solid platinum wall. The nanostructures which reside on top of the solid wall have shape of rectangular block. The solid-liquid interfacial wettability, in other words whether the solid surface is hydrophilic or hydrophobic has been altered for different cases to examine its effect on boiling phenomena. The initial configuration of the simulation domain comprised a three phase system (solid platinum, liquid argon and vapor argon) which was equilibrated at 90 K. After equilibrium period, the wall temperature was suddenly increased from 90 K to 250 K which is far above the critical point of argon and this initiates rapid or explosive boiling. The spatial and temporal variation of temperature and density as well as the variation of system pressure with respect to time were closely monitored for each case. The heat flux normal to the solid surface was also calculated to illustrate the effectiveness of heat transfer for different cases of wetting conditions of solid surface. The results show that the wetting condition of surface has significant effect on explosive boiling of the thin liquid film. The surface with higher wettability (hydrophilic) provides more favorable conditions for boiling than the low-wetting surface (hydrophobic) and therefore, liquid argon responds quickly and shifts from liquid to vapor phase faster in case of hydrophilic surface.

Linear Stability of Thin Liquid Film On Solid Surface Under Effect of Apolar and Electrostatic Forces

2012 ◽  
Author(s):  
Mohanad El–Harbawi ◽  
Luqman Chuah Abdullah ◽  
Shean Yaw Thomas Choong ◽  
Siti Aslina Hussain ◽  
Azni Idris
Keyword(s):  
Liquid Film ◽  
Linear Stability ◽  
Solid Surface ◽  
Thin Liquid Film ◽  
Navier Stokes ◽  
Electrostatic Forces

Kestabilan lapisan tipis cecair pada permukaan pepejal di bawah kuasa kutub dan elektrostatik dikaji. Aliran ditunjukkan oleh persamaan Navier–Stokes dua dimensi dipasangkan dengan persamaan penerusan serta digabungkan dengan garisan sempadan. Lapisan tipis adalah dimodelkan sebagai cecair Newtonian dua dimensi ketumpatan, ρ dan kelikatan, μ mengalir pada permukaan mendatar. Lapisan tebal purata, h0 adalah dianggap cukup tebal untuk mengabaikan kesan graviti dan dihadkan oleh gas pasif serta ditambah pada sisinya kepada infiniti (model dua dimensi). Kuasa jasad pada persamaan Navier–Stokes telah diubahsuai dengan mengambil kira interaksi di antara (kuasa kutub dan elektrostatik) lapisan cecair dengan permukaan pepejal disebabkan oleh kuasa kutub dan elektrostatik. Pengubahsuaian persamaan Navier–Stokes dengan gabungan garisan sempadan diselesaikan dengan menggunakan persamaan panjang gelombang untuk mendapatkan persamaan tidak lurus evolusi permukaan–permukaan lapisan. Bahagian kuasa elektrostatik adalah lebih besar dalam nilai kuasa kutub dan berpengaruh terhadap sifat lapisan tipis serta kesan utama pada sifat–sifat tenaga bebas berlebihan, kadar penambahan, kadar penambahan maksimum, nombor gelombang natural, nombor gelombang berpengaruh dan masa pecahan. Maka, teori linear adalah kurang menunjukkan sifat-sifat kestabilan lapisan. Pengiraan menunjukkan bahawa kuasa kutub dan elektrostatik hanya boleh digunakan untuk penghasilan lapisan mendatar dengan ketebalan h0

Three-Dimensional Shear Driven Thin Liquid Film in a Duct

2006 ◽  
Author(s):  
H. Lan ◽  
M. Friedrich ◽  
B. F. Armaly ◽  
J. A. Drallmeier
Keyword(s):  
Film Thickness ◽  
Liquid Film ◽  
Flow Rate ◽  
High Speed ◽  
Volume Flow Rate ◽  
Incident Light ◽  
Thin Liquid Film ◽  
Air Flow ◽  
Three Dimensional ◽  
Vof Model

Measurements and predictions of three-dimensional shear driven thin liquid films by turbulent air flow in a duct are reported. FLUENT - CFD code is used to perform the numerical simulations and the Reynolds Averaged Navier-Stokes and continuity equations along with the Volume of Fluid (VOF) model and the realizable k-ε turbulence model are implemented for this task. Film thickness and width are reported as a function of air flow rate, liquid film volume flow rate and surface tension, and a comparison with preliminary measured results is made. The thickness of the shear driven liquid film is measured using an interferometric technique that makes use of the phase shift between the reflection of incident light from the top and bottom surfaces of the thin liquid film. The spatial resolution is determined based on the spot size of the incident light, which for the current configuration of the transmitting optics is approximately 10 microns. The resulting fringe pattern is imaged using a high-speed imaging camera operating at 2000 frames per second. The technique has proved successful in measuring thickness between 100 and 900 microns in these shear driven films. Simulation results reveal that higher gas flow velocity decreases the film thickness but increases its width, while higher liquid film flow rate increases the film thickness and increases its width. Reasonable comparison appears to exist between preliminary measured and simulated results.

Generating one-dimensional micro- or nano-structures with in-plane alignment by vapor-driven wetting kinetics

2017 ◽  
Vol 4 (2) ◽  
pp. 259-267 ◽  
Author(s):  
Chuan Liu ◽  
Xuying Liu ◽  
Yong Xu ◽  
Huabin Sun ◽  
Yun Li ◽  
...  
Keyword(s):  
Liquid Film ◽  
Solid Surface ◽  
Thin Liquid Film ◽  
One Dimensional ◽  
Nanostructure Formation ◽  
Nano Structures ◽  
Wetting Kinetics

The wetting of a droplet on a particular solid surface of a thin liquid film followed by solvent drying is a crucial process for nanostructure formation.

Electrohydrodynamic Ridge Instability of a Thin Film Flowing Down an Inclined Plate

1968 ◽  
Vol 90 (1) ◽  
pp. 135-145 ◽  
Author(s):  
Chung-Oh Lee ◽  
H. Y. Choi
Keyword(s):  
Liquid Film ◽  
Flow Direction ◽  
Thin Liquid Film ◽  
Three Dimensional ◽  
Successive Approximations ◽  
Method Of Successive Approximations ◽  
Inclined Plate ◽  
Instability Waves ◽  
Finite Electrical Conductivity ◽  
Small Reynolds Numbers

In the flow of a thin liquid film, ridge-type instability occurs in a wide variety of engineering systems. These are instability waves whose crests are parallel to the flow direction. Ridges have also been observed when a flowing film is stressed by an electric field applied normal to the interface. It is shown that in this case also the instability is essentially of a hydrodynamic nature and an analysis is presented explaining when and why ridges occur. In the analysis, the three-dimensional Orr-Sommerfeld equation is solved by the method of successive approximations in terms of small Reynolds numbers. The theory for ridge instability further takes into account the finite electrical conductivity of the liquid film, showing the limit of validity of the simplified theories in the literature for perfectly conducting interface and ideally polarized interface. Experimental results are presented supporting the theory.

Sign in / Sign up

Export Citation Format

Share Document