Molecular dynamics study on the effect of boundary heating rate on the phase change characteristics of thin film liquid

2016 ◽  
Author(s):  
Mohammad Nasim Hasan ◽  
A. K. M. Monjur Morshed ◽  
Kazi Fazle Rabbi ◽  
Mominul Haque
Keyword(s):  
Thin Film ◽  
Molecular Dynamics ◽  
Phase Change ◽  
Heating Rate ◽  
Change Characteristics

scholarly journals Phase Change Characteristics of Ge-Se-Te Thin Film for PRAM

2011 ◽  
Vol 24 (12) ◽  
pp. 982-987
Author(s):  
Jae-Ho Shin ◽  
Byung-Cheul Kim ◽  
Jong-Bin Yeo ◽  
Hyun-Yong Lee
Keyword(s):  
Thin Film ◽  
Phase Change ◽  
Change Characteristics

scholarly journals Phase Change Characteristics of Ultra-Thin Liquid Argon Film over different Flat Substrates at High Wall Superheat for Hydrophilic/Hydrophobic Wetting Condition: A Non-Equilibrium Molecular Dynamics Study

2017 ◽  
Vol 29 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Mohammad Nasim Hasan ◽  
SM Shavik ◽  
KF Rabbi ◽  
KM Mukut ◽  
AKMM Morshed
Keyword(s):  
Molecular Dynamics ◽  
Phase Change ◽  
Change Process ◽  
Liquid Argon ◽  
Surface Wettability ◽  
Phase Change Process ◽  
Wall Superheat ◽  
Change Characteristics ◽  
Non Equilibrium Molecular Dynamics ◽  
Solid Liquid

Non-equilibrium molecular dynamics simulations have been conducted to understand the effect of solid-liquid interfacial wettability and surface material on the phase change phenomena of the thin liquid argon film placed over flat substrate at high wall superheat. The molecular system consists of a three phase simulation domain involving solid wall, liquid argon and argon vapor. After the system is thermally equilibrated at 90K and kept in equilibrium for a while, a high wall superheat (250K that is far above the critical temperature of argon) is induced at the liquid boundary so that the liquid undergoes ultrafast heating. Both hydrophilic and hydrophobic surfaces were considered in the present study in order to observe the effect of surface wettability on phase change characteristics for three different solid substrate materials namely, Platinum (Pt), Silver (Ag) and Aluminium (Al). Results obtained in the present study are discussed in terms of transient atomic distribution inside system domain, heat flux characteristics across the solid-liquid interface together with evaporative mass flux from liquid argon. Simulation results show that, depending on the surface wetting condition, the phase change process appears to be very different (explosive/ diffusive) for all three substrate materials under consideration. Among three materials considered herein, Al is found to offer the least favourable condition for phase change process while Pt and Ag show similar heat and mass transfer characteristics for both hydrophilic and hydrophobic wetting conditions. Surface wettability effect is found to be more prominent than the effect of substrate material in thin film liquid phase change phenomena.Journal of Chemical Engineering, Vol. 29, No. 1, 2017: 49-55

scholarly journals Molecular dynamics approach to thin‐film liquid phase change phenomena on functionally gradient wettability surface

2020 ◽  
Vol 15 (7) ◽  
pp. 455-460
Author(s):  
Md Shajedul Hoque Thakur ◽  
Mahmudul Islam ◽  
Shahriar Alam ◽  
Mohammad Nasim Hasan ◽  
Yuichi Mitsutake ◽  
...  
Keyword(s):  
Thin Film ◽  
Molecular Dynamics ◽  
Liquid Phase ◽  
Phase Change ◽  
Functionally Gradient ◽  
Phase Change Phenomena

Phase change characteristics of Ge 2 Sb 2 Te 5 thin film for a self-holding optical gate switch

2011 ◽  
Author(s):  
Tatsuya Toyosaki ◽  
Daiki Tanaka ◽  
Yuya Shoji ◽  
Masashi Kuwahara ◽  
Xiaomin Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Change ◽  
Change Characteristics ◽  
Optical Gate

The effect of an aluminum heat-sink layer on the laser-induced amorphization of SiOx/TeGeSn/SiOx phase-change recording films

1989 ◽  
Vol 47 ◽  
pp. 574-575
Author(s):  
Matthew R. Libera ◽  
Martin Chen
Keyword(s):  
Thin Film ◽  
Phase Change ◽  
Heat Sink ◽  
Multilayer Film ◽  
Glassy Phase ◽  
Film Structure ◽  
Glass Forming ◽  
Active Storage ◽  
Dielectric Layers ◽  
Amorphous States

Phase-change erasable optical storage is based on the ability to switch a micron-sized region of a thin film between the crystalline and amorphous states using a diffraction-limited laser as a heat source. A bit of information can be represented as an amorphous spot on a crystalline background, and the two states can be optically identified by their different reflectivities. In a typical multilayer thin-film structure the active (storage) layer is sandwiched between one or more dielectric layers. The dielectric layers provide physical containment and act as a heat sink. A viable phase-change medium must be able to quench to the glassy phase after melting, and this requires proper tailoring of the thermal properties of the multilayer film. The present research studies one particular multilayer structure and shows the effect of an additional aluminum layer on the glass-forming ability.

scholarly journals Molecular Dynamics study on size dependencies of melting dynamics in Gold thin film

2021 ◽  
Vol 1098 (6) ◽  
pp. 062062
Author(s):  
R Fahdiran ◽  
I Sugihartono ◽  
E Handoko ◽  
E Budi ◽  
A B Susila ◽  
...  
Keyword(s):  
Thin Film ◽  
Molecular Dynamics ◽  
Gold Thin Film ◽  
Melting Dynamics
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