Short pulse laser melting and resolidification of a metal target are investigated in continuum and atomistic computer simulations. The cooling rates achievable in laser quenching are calculated within the framework of two-temperature model for a range of laser fluences and pulse durations. A well-defined maximum in the cooling rate dependence on the pulse duration and fluence is observed and ex...

The challenge of confining hydrogen and its isotopes at high pressures and temperatures have hindered exploration of the predicted novel phases and their properties in static high P-T experiments. We have developed new methods to achieve good local confinement of hot, dense hydrogen that additionally protects the diamond anvils during the experiments. Raman spectra of such locally confined hydr...

Hybrid glasses connect the emerging field of metal-organic frameworks (MOFs) with the glass formation, amorphization and melting processes of these chemically versatile systems. Though inorganic zeolites collapse around the glass transition and melt at higher temperatures, the relationship between amorphization and melting has so far not been investigated. Here we show how heating MOFs of zeoli...

In this paper neuro-fuzzy technique is used for the first time in modeling eco-friendly furnace parameters to predict the melting rate of the molten metal required to produce homogenous and quality castings. The relationship between the process variables (input) viz. flame temperature, preheat air temperature, rotational speed of the furnace dome, percentage of excess air, melting time, fuel co...

We present a simple, linear 3D cellular automata approach for animating the melting process of solid volumetric models. Accurate modelling of object melting usually requires complicated physical simulations of heat transfer and phase transition from solid to liquid. Instead, we propose a simplified model to describe the melting behaviors of highly viscous objects, such as wax, lava, plastic, me...

The most PCMs with high energy storage density have an unacceptably low heat conductivity and hence internal heat transfer enhancement techniques such as fins or other metal structures are required in latent heat thermal storage (LHTS) applications. Previous work has concentrated on numerical and experimental examination in determining the influence of the fins in melting phase change material....

Interfacial thermal conductance (ITC) affects heat transfer in many physical phenomena and is an important parameter for various technologies. The article considers the influence of mesoscopic effects on ITC, such as through gas gap, near-field radiative transfer, changes wetting behavior during melting. Various contributions to ITC liquid-solid interfaces processes fast pre-melting melting met...

Submitted for the MAR09 Meeting of The American Physical Society Molecular dynamics study of the phase transition in the bcc metal nanoparticles YASUSHI SHIBUTA, TOSHIO SUZUKI, The University of Tokyo — The phase transition between liquid and solid phases in bcc metal nanoparticles was investigated using a molecular dynamics simulation. The nucleation from an undercooled liquid droplet was obse...

The vacancy mechanism of the melting process is utilized as a starting point for deriving the formula for the difference of the heat capacity of the liquid and solid metal in the neighbourhood of the melting point. From these calculations it follows that the difference C,, C,, is the same for all the metals and equals 3.50 J g.atom-' K-'. This result is compared with the existing in the literat...