Electric pulse heating device for the analysis of solid/solid phase transformations

2021 ◽  
Vol 92 (7) ◽  
pp. 074703
Author(s):  
T. Kaaden ◽  
V. Tympel ◽  
M. Kober ◽  
F. Schmidl ◽  
M. Rettenmayr ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Pulse Heating ◽  
Solid Phase ◽  
Electric Pulse ◽  
Heating Device ◽  
Electric Pulse Heating

Effect of aluminum compound addition on graphitization of wood charcoal by direct electric pulse heating method

2004 ◽  
Vol 50 (2) ◽  
pp. 177-181 ◽  
Author(s):  
Koei Nishimiya ◽  
Toshimitsu Hata ◽  
Hikari Kikuchi ◽  
Yuji Imamura
Keyword(s):  
Pulse Heating ◽  
Electric Pulse ◽  
Wood Charcoal ◽  
Aluminum Compound ◽  
Heating Method ◽  
Electric Pulse Heating

scholarly journals ELECTRIC PULSE HEATING OF REACTIVE COMPOSITIONS BY THIN-WALLED CONDUCTORS-HEATERS IN THE MODES OF MULTI-POINT IGNITION OF PROPELLANT CHARGES

2021 ◽  
pp. 24-36
Author(s):  
Sergey I. VOLODCHENKOV ◽  
◽  
Anatoliy A. GLAZUNOV ◽  
Sergey V. SINYAEV ◽  
◽  
...  
Keyword(s):  
Melting Point ◽  
Arbitrary Function ◽  
Pulse Heating ◽  
Electric Pulse ◽  
Thermal Contact ◽  
High Energy ◽  
Heating Power ◽  
Ideal Thermal Contact ◽  
Heating Up ◽  
Electric Pulse Heating

The problem of electric pulse heating of a medium by the heater made of metal foil with an ideal thermal contact with the medium is solved. The solution is obtained in the form of rapidly converging series for ohmic heating power, which is given as an arbitrary function of time. Using the obtained solution, a dimensionless criterion is introduced for quasi-homogeneous heating of the heater up to a melting point with intensive heat transfer to environment. It is shown that with a fixed heating duration, the criterion value depends weakly on the type of a heating power function, which allows ignoring parameters of the external electrical circuit of the device while choosing the heater thickness. The definition of a "thin" heater is introduced, which admits of bulk droplet destruction during heating of a reactive medium. In the "thin" heater approximation, quadrature solutions to the thermal problem are obtained under heat exchange according to Newton's law and ideal thermal contact, when the heater power is an arbitrary function of time. Dimensionless similarity parameters of the simulated processes are identified in all solutions, which include thermal and physical characteristics of the heater and medium, as well as the thickness of the heater and the time of its heating up to the melting point. The applicability of the "thin" heater model for calculating the thermal state of a high-energy pyrotechnic coating is shown. As an example, the permissible values of the thickness of the magnesium foil heater are determined, which ensure its uniform heating up to the melting point in 1 and 5 milliseconds under the ideal thermal contact with ignited coating. The obtained quadrature solutions to the thermal problems and the calculated results are applicable in the design of compact electric pulse devices for contact multi-point ignition of various reactive compositions with efficient consumption of electric energy.

Thermal synthesis under the conditions of electric pulse heating

1993 ◽  
Vol 65 (4) ◽  
pp. 963-966
Author(s):  
S. A. Balankin ◽  
V. S. Sokolov ◽  
A. O. Troitskii ◽  
D. M. Mishchenko
Keyword(s):  
Pulse Heating ◽  
Electric Pulse ◽  
Thermal Synthesis ◽  
Electric Pulse Heating

scholarly journals Direct observation of the processes near particle-to-particle contacts at electric pulse consolidation of titanium powder

2019 ◽  
Vol 488 (5) ◽  
pp. 504-507
Author(s):  
A. S. Rogachev ◽  
S. G. Vadchenko ◽  
V. A. Kudryashov ◽  
A. S. Shchukin ◽  
M. I. Alymov
Keyword(s):  
High Speed ◽  
Pulse Heating ◽  
Electric Pulse ◽  
Liquid Phase Sintering ◽  
Powder Materials ◽  
Plasma Sintering ◽  
Electric Current Pulses ◽  
Spark Plasma ◽  
Powder Particles ◽  
Electric Pulse Heating

Direct high-speed micro-video records prove the existence of highly overheated zones at the contacts of powder particles during short (~ 1 ms) electric current pulses. The value of overheating can exceed 1600 degrees and lead to the formation of liquid-phase sintering necks, the dimensions of which are well correlated with the size of the overheated zones. The micro-uniformity of the temperature field in the electric pulse heating allow understanding the unusually high consolidation rates of powder materials observed in spark plasma sintering.

Electric pulse heating at the site of deformation during rolling

1993 ◽  
Vol 32 (6) ◽  
pp. 497-500 ◽  
Author(s):  
I. M. Mal'tsev ◽  
V. G. Petrikov
Keyword(s):  
Pulse Heating ◽  
Electric Pulse ◽  
Electric Pulse Heating

Heat capacities and enthalpies of fusion and transformation for solvates of some salts with dimethyl sulfoxide and dimethylformamide

1988 ◽  
Vol 53 (12) ◽  
pp. 3072-3079
Author(s):  
Mojmír Skokánek ◽  
Ivo Sláma
Keyword(s):  
Heat Capacity ◽  
Phase Transformation ◽  
Phase Transformations ◽  
Dimethyl Sulfoxide ◽  
Liquidus Temperature ◽  
Molar Heat Capacity ◽  
Solid Phase ◽  
Zinc Nitrate ◽  
Heat Capacities ◽  
Liquid Phases

Molar heat capacities and molar enthalpies of fusion of the solvates Zn(NO3)2 . 2·24 DMSO, Zn(NO3)2 . 8·11 DMSO, Zn(NO3)2 . 6 DMSO, NaNO3 . 2·85 DMSO, and AgNO3 . DMF, where DMSO is dimethyl sulfoxide and DMF is dimethylformamide, have been determined over the temperature range 240 to 400 K. Endothermic peaks found for the zinc nitrate solvates below the liquidus temperature have been ascribed to solid phase transformations. The molar enthalpies of the solid phase transformations are close to 5 kJ mol-1 for all zinc nitrate solvates investigated. The dependence of the molar heat capacity on the temperature outside the phase transformation region can be described by a linear equation for both the solid and liquid phases.

Reactivity in solid phase. Transformations of 2,4-di-tert-butylphenol and its derivatives under elastic deformation conditions

1996 ◽  
Vol 45 (6) ◽  
pp. 1428-1432
Author(s):  
V. B. Vol'eva ◽  
I. S. Belostotskaya ◽  
A. Yu. Karmilov ◽  
N. L. Komissaroya ◽  
V. V. Ershov
Keyword(s):  
Phase Transformations ◽  
Elastic Deformation ◽  
Solid Phase

The growth kinetics of individual ledges during solid-solid phase transformations

1981 ◽  
Vol 378 (1774) ◽  
pp. 351-368 ◽  
Keyword(s):  
Phase Transformations ◽  
Volume Diffusion ◽  
Solid Phase ◽  
Parent Phase ◽  
Steady Motion ◽  
Diffusion Field ◽  
Lateral Growth ◽  
Small Perturbations ◽  
Step Motion ◽  
Kinetics Of

The problem of step motion during lateral growth in solid-solid phase transformations is re-examined. Results are obtained for the steady motion of an individual ledge when volume diffusion in the parent phase is the predominant contribution to the growth rate. A comparison is made between our results and the earlier work of Jones & Trivedi (1971). There are significant differences between the two sets of results particularly in the limit of small perturbations to the Laplacian diffusion field. To confirm the accuracy of the results presented here the calculations have been made by two different methods.

Multiphase Phase-Field Approach for Virtual Melting: A Brief Review

2021 ◽  
Vol 18 (2) ◽  
pp. 102-107
Author(s):  
Arunabha Mohan Roy
Keyword(s):  
Phase Transformations ◽  
Phase Field ◽  
Field Model ◽  
Solid Phase ◽  
Scale Effects ◽  
Phase Field Model ◽  
Short Review ◽  
Nanoscale Material ◽  
Material Parameters ◽  
Field Approach

A short review on a thermodynamically consistent multiphase phase-field approach for virtual melting has been presented. The important outcomes of solid-solid phase transformations via intermediate melt have been discussed for HMX crystal. It is found out that two nanoscale material parameters and solid-melt barrier term in the phase-field model significantly affect the mechanism of PTs, induces nontrivial scale effects, and changes PTs behaviors at the nanoscale during virtual melting.

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