scholarly journals Time sampling method in thermal analysis for condensed media

2020 ◽  
pp. 112-118
Author(s):  
E.G. Iskenderov ◽  
◽  
V.I. Dvoryanchikov ◽  
Y.A. Dibirov ◽  
◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Inorganic Compounds ◽  
Transition Process ◽  
Time Interval ◽  
Time Sampling ◽  
Condensed Media ◽  
Java Programming ◽  
Phase Transition Process ◽  
Calculation Results ◽  
Series Of Experiments

Method of time sampling for processing of structured data obtained during thermal analysis of condensed media is presented, based on comparison of maximum time intervals of processes of phase transitions. Proposed method makes it possible to simplify analysis and processing of data obtained as a result of series of experiments and to identify composition, which has the largest value of time interval of phase transition process. To implement the proposed method, a program in the Java programming language was developed, which is a JavaDesktop application with an intuitive graphical interface. The calculation results are exported to a text and graphic file. To verify the feasibility of this method, studies were carried out on melting a series of ice samples and ice-containing compositions of aqueous solutions of inorganic compounds, as a result of which specific samples of compositions with the best thermophysical properties for accumulating cold were obtained from each series.

A Time Sampling Method in the Thermal Analysis for Condensed Media

2021 ◽  
Vol 63 (9) ◽  
pp. 1575-1582
Author(s):  
E. G. Iskenderov ◽  
V. I. Dvoryanchikov ◽  
Ya. A. Dibirov
Keyword(s):  
Thermal Analysis ◽  
Sampling Method ◽  
Time Sampling ◽  
Condensed Media

The effect of Argon pressure dependent V thin film on the phase transition process of (020) VO2 thin film

2018 ◽  
Vol 427 ◽  
pp. 304-311 ◽  
Author(s):  
Yifan Meng ◽  
Kang Huang ◽  
Zhou Tang ◽  
Xiaofeng Xu ◽  
Zhiyong Tan ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Transition Process ◽  
Argon Pressure ◽  
Phase Transition Process

Exploration of Doubly Thermal Phase Transition Process of PDEGA-b-PDMA-b-PVCL in Water

Langmuir ◽  
2016 ◽  
Vol 32 (26) ◽  
pp. 6691-6700 ◽  
Author(s):  
Zhangxin Ye ◽  
Youcheng Li ◽  
Zesheng An ◽  
Peiyi Wu
Keyword(s):  
Phase Transition ◽  
Transition Process ◽  
Thermal Phase Transition ◽  
Phase Transition Process ◽  
Thermal Phase

scholarly journals INFLUENCE OF SOME PARAMETERS IN THE RESULTS OF THERMAL ANALYSIS OF POLYVINYL ALCOHOL

2019 ◽  
Vol 16 (31) ◽  
pp. 235-241
Author(s):  
Mariana Fornazier BORGES
Keyword(s):  
Thermal Analysis ◽  
Polyvinyl Alcohol ◽  
Heating Rate ◽  
Synthetic Polymer ◽  
Qualitative And Quantitative ◽  
Physical Form ◽  
Series Of Experiments ◽  
Rate Type ◽  
Tga And Dsc ◽  
Dsc Curves

The present work seeks to demonstrate through a series of experiments such as the parameters heating rate, type of stand and physical form of the sample, can influence the qualitative and quantitative aspects of the results of the thermal analyzes of TGA and DSC. To do this, polyvinyl alcohol, a synthetic polymer was used as a model and its thermal behavior was discussed by the results obtained by the thermogravimetric (TGA) and DSC curves, showing the effect of the alteration of each parameter, such as the displacement at the temperature at which the thermal events occur in the TGA curves, related to the alteration of the physical form of the sample; the intensification of the DSC peaks due to the increase of the heating rate, the change in the heat flow by changing the stand and masking some events such as the glass transition temperature.

A New Lattice Boltzmann Model for Phase Transition Process

2009 ◽  
Author(s):  
Longjian Li ◽  
Jianbang Zeng ◽  
Quan Liao ◽  
Wenzhi Cui
Keyword(s):  
Phase Transition ◽  
Lattice Boltzmann ◽  
Equations Of State ◽  
Density Ratio ◽  
Transition Process ◽  
Lattice Boltzmann Model ◽  
New Model ◽  
Phase Transition Process ◽  
Simulation Results ◽  
Boltzmann Model

A new lattice Boltzmann model, which is based on Shan-Chen (SC) model, is proposed to describe liquid-vapor phase transitions. The new model is validated through simulation of the one-component phase transition process. Compared with the simulation results of van der Waals fluid and the Maxwell equal-area construction, the results of new model are closer to the analytical solutions than those of SC model and Zhang model. Since the range of temperature and the maximum density ratio are increased, and the value of maximum spurious current is between those of SC and Zhang models, it is believed that this new model has better stability than SC and Zhang models. Therefore, the application scope of this new model is expanded. According to the principle of corresponding states in Engineering Thermodynamics, the simulations of water and ammonia phase transition process are implemented by using this new model with different equations of state. Compared to the experimental data of water and ammonia, the results show that the Peng-Robinson equation of state is more suitable to describe the water, ammonia and other substances phase transition process. Therefore, these simulation results have great significance for the real engineering applications.

CROSSOVER FROM RABI TO JOSEPHSON DYNAMICS IN TWO-COUPLED BOSE–EINSTEIN CONDENSATES AS A PHASE TRANSITION PROCESS

2002 ◽  
Vol 16 (27) ◽  
pp. 1021-1026 ◽  
Author(s):  
ARANYABHUTI BHATTACHERJEE ◽  
MAN MOHAN
Keyword(s):  
Phase Transition ◽  
Mean Field ◽  
Perturbation Expansion ◽  
Transition Process ◽  
Field Energy ◽  
Linear Perturbation ◽  
Small Oscillations ◽  
Phase Transition Process ◽  
Tunneling Matrix Element ◽  
Bose Einstein

Crossover from individual Rabi dynamics to collective Josephson dynamics in two-coupled Bose–Einstein condensates is studied as a phase transition process. We obtain the critical value of the parameter Λ (ratio of the mean field energy to the tunneling matrix element) for the π-phase oscillations from the non-linear perturbation expansion of small oscillations around the saddle point of the first-order Euclidean (imaginary time) differential equations for polar and azimuthal angles θ and ϕ without approximation.

Packing Characteristics and Its Effect on Heat Transfer Characteristics in Melting of Granular Packed Bed Subject to Horizonal Forced Convection

2002 ◽  
Author(s):  
Y. L. Hao ◽  
Y.-X. Tao
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Melting Process ◽  
Packed Bed ◽  
Time Interval ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Ice Particles ◽  
Different Types ◽  
Series Of Experiments

A series of experiments are conducted to investigate the characteristics and its effect on the melting and heat of a packed bed consisting of melting ice particles to horizontal forced convection. The volumes and situations of the melting ganular packed beds are by the visualization observations and measurements digital camcorders within the range of Re = 71 ~ 2291, Gr/Re2 = 1.48×10−5 ~ 17.32, and Ste = 0.0444 ~ 0.385, respectively. The mass of ice particles is measured at the time interval during the melting process. Two types of pattern can be found under the different conditions. The different types of heat transfer characteristics emerge in type of packing pattern. The correlations for each type of pattern are obtained based on the experimental results.

Simulation of phase transition process using lattice Boltzmann method

2009 ◽  
Vol 54 (24) ◽  
pp. 4596-4603 ◽  
Author(s):  
JianBang Zeng ◽  
LongJian Li ◽  
Quan Liao ◽  
WenZhi Cui ◽  
QingHua Chen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Transition Process ◽  
Phase Transition Process ◽  
Boltzmann Method
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