Effect of liquid film on near-threshold laser ablation of a solid surface

2004 ◽  
Vol 222 (1-4) ◽  
pp. 138-147 ◽  
Author(s):  
Dongsik Kim ◽  
Bukuk Oh ◽  
Ho Lee
Keyword(s):  
Laser Ablation ◽  
Liquid Film ◽  
Solid Surface ◽  
Near Threshold

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

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.

Ultra-short pulsed laser ablation of silicon nitride layers: Investigation near threshold fluence

2013 ◽  
Vol 278 ◽  
pp. 265-267 ◽  
Author(s):  
Gerrit Heinrich ◽  
Markus Wollgarten ◽  
Mario Bähr ◽  
Alexander Lawerenz
Keyword(s):  
Silicon Nitride ◽  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Threshold Fluence ◽  
Nitride Layers ◽  
Near Threshold
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