scholarly journals Competition between Relaxation Kinetics and Heat Transfer in the Dynamics of Phase Transition Fronts

1997 ◽  
Vol 07 (C5) ◽  
pp. C5-53-C5-58 ◽  
Author(s):  
A. Gordon ◽  
S. Dorfman ◽  
D. Fuks
Keyword(s):  
Heat Transfer ◽  
Phase Transition ◽  
Relaxation Kinetics ◽  
Transition Fronts

Fast forced liquid film spreading on a substrate: flow, heat transfer and phase transition

2010 ◽  
Vol 656 ◽  
pp. 189-204 ◽  
Author(s):  
ILIA V. ROISMAN
Keyword(s):  
Heat Transfer ◽  
Phase Transition ◽  
Stokes Equations ◽  
Substrate Surface ◽  
Reynolds Numbers ◽  
Drop Impact ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Theoretical Predictions ◽  
Viscous Drop

This theoretical study is devoted to description of fluid flow and heat transfer in a spreading viscous drop with phase transition. A similarity solution for the combined full Navier–Stokes equations and energy equation for the expanding lamella generated by drop impact is obtained for a general case of oblique drop impact with high Weber and Reynolds numbers. The theory is applicable to the analysis of the phenomena of drop solidification, target melting and film boiling. The theoretical predictions for the contact temperature at the substrate surface agree well with the existing experimental data.

On shock waves and phase-transition fronts in continua

ARI ◽  
1998 ◽  
Vol 50 (3) ◽  
pp. 141-150 ◽  
Author(s):  
G. A. Maugin
Keyword(s):  
Phase Transition ◽  
Shock Waves ◽  
Transition Fronts

scholarly journals Dynamics of impact-induced phase transition fronts

2003 ◽  
Vol 112 ◽  
pp. 167-170
Author(s):  
A. Berezovski ◽  
G. A. Maugin
Keyword(s):  
Phase Transition ◽  
Transition Fronts

Numerical Modeling of Heat Transfer and Phase Transition in Programming the Ovonic Unified Memory Cells

2005 ◽  
Author(s):  
Evan Small ◽  
Sadegh M. Sadeghipour ◽  
Mehdi Asheghi
Keyword(s):  
Heat Transfer ◽  
Phase Transition ◽  
Diffusion Equation ◽  
Dynamic Range ◽  
Semiconductor Device ◽  
Computer Code ◽  
Drift Diffusion ◽  
Thermally Induced ◽  
Design And Optimization ◽  
Phase Prediction

An Ovonic Unified Memory (OUM) cell is a semiconductor device that stores data by a thermally induced phase transition between polycrystalline (set) and amorphous (reset) states in a thin film of chalcogenide alloy. The small volume of active media acts as a programmable resistor switching between a high (amorphous) and low (crystalline) resistance state. The change in the film resistivity (>40X dynamic range) caused by this rapid, reversible structural change is measured to detect the state of the cell (set or reset) for read out. OUM can benefit from a simulator capable of predicting the electrical, thermal, and crystallization behavior for design and optimization, particularly at the present stage of the development. This paper reports on the efforts being made to prepare such a numerical simulator, using an existing finite element computer code as the source for thermal and electrical modeling, and a custom crystallization code for phase prediction. Heat generation in the device is by Joule heating and is achieved by passage of the electric current, which is obtained from the electrical simulation. This result appears in the heat source term of the heat transfer equation that is solved for thermal modeling. As the first attempt the Ohmic current-voltage relation was implemented successfully to simulate set and reset in a two dimensional model of OUM. Solution of the drift-diffusion equation is now underway to capture the semiconductor behavior of the I-V curve. A good progress is made however, still more works needs to be done to fully implement the drift diffusion equation.

Numerical Simulation of Melting of Phase Change Material in a Square Cavity with a Heat Source

2016 ◽  
Vol 685 ◽  
pp. 104-108 ◽  
Author(s):  
Nadezhda S. Bondareva ◽  
Mikhail A. Sheremet
Keyword(s):  
Heat Transfer ◽  
Phase Transition ◽  
Heat Source ◽  
Local Heat ◽  
Effect Of Temperature ◽  
Square Cavity ◽  
Flow And Heat Transfer ◽  
The Finite Difference Method ◽  
Change Material ◽  
Melting And Solidification

Melting and solidification problems are important in applications of many industries. In the present work mathematical simulation of natural convection with phase transition inside an enclosure with a local heat source has been carried out. Partial differential equations with corresponding initial and boundary conditions have been solved using the finite difference method. The effect of temperature differences on fluid flow and heat transfer has been discussed.

scholarly journals Experimental Research on the Thermal Performance of Composite PCM Hollow Block Walls and Validation of Phase Transition Heat Transfer Models

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Yuan Zhang ◽  
Sunqi Zhuang ◽  
Qian Wang ◽  
Jiapeng He
Keyword(s):  
Heat Transfer ◽  
Phase Transition ◽  
Thermal Performance ◽  
Heat Transfer Process ◽  
Unsteady State ◽  
Typical Structure ◽  
Hollow Block ◽  
Change Material ◽  
Capacity Method ◽  
Transition Heat

A type of concrete hollow block with typical structure and a common phase change material (PCM) were adopted. The PCM was filled into the hollow blocks by which the multiform composite PCM hollow blocks were made. The temperature-changing hot chamber method was used to test the thermal performance of block walls. The enthalpy method and the effective heat capacity method were used to calculate the heat transfer process. The results of the two methods can both reach the reasonable agreement with the experimental data. The unsteady-state thermal performance of the PCM hollow block walls is markedly higher than that of the wall without PCM. Furthermore, if the temperature of the PCM in the wall does not exceed its phase transition temperature range, the PCM wall can reach high thermal performance.

Material Forces: Concepts and Applications

1995 ◽  
Vol 48 (5) ◽  
pp. 213-245 ◽  
Author(s):  
Ge´rard A. Maugin
Keyword(s):  
Phase Transition ◽  
Driving Forces ◽  
Material Balance ◽  
Balance Laws ◽  
Material Forces ◽  
Material Force ◽  
Localized Solutions ◽  
Transition Fronts ◽  
Relevant Material ◽  
Eshelbian Mechanics

The unifying notion of material force which gathers under one vision all types of driving “forces” on defects and smooth or abrupt inhomogeneities in fracture, defect mechanics, elastodynamics (localized solutions) and allied theories such as in electroelasticity, magnetoelasticity, and the propagation of phase transition fronts, is reviewed together with its many faceted applications. The presentation clearly distinguishes between the role played by local physical balance laws in the solution of boundary-value problems and that played by global material balance laws in obtaining the expression of relevant material forces and devising criteria of progress for defects, in a general way. The advances made along this line, which may be referred to as Eshelbian mechanics, are assessed and perpectives are drawn.

scholarly journals Dynamics of discontinuities in elastic solids

2017 ◽  
Vol 25 (7) ◽  
pp. 1416-1428
Author(s):  
Arkadi Berezovski ◽  
Mihhail Berezovski
Keyword(s):  
Phase Transition ◽  
Martensitic Phase ◽  
Singular Set ◽  
Configurational Force ◽  
Elastic Solids ◽  
Main Attention ◽  
Martensitic Phase Transition ◽  
Material Points ◽  
Transition Fronts

The paper is devoted to evolving discontinuities in elastic solids. A discontinuity is represented as a singular set of material points. Evolution of a discontinuity is driven by the configurational force acting at such a set. The main attention is paid to the determination of the velocity of a propagating discontinuity. Martensitic phase transition fronts and brittle cracks are considered as representative examples.

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