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article

Thermodynamic model and viscosity of Na2O–MgO–CaO–SiO2 glasses

Mária Chromčíková, Marek Liška, Jan Macháček, Jozef Chovanec, more

Journal of Non-Crystalline Solids > 2014 > 401 > Complete > 237-240

The structure–viscosity relationship of 15Na ₂ O·xMgO·(10−x)CaO·75SiO ₂ (x=0, 2, 4, 6, 8, 10) glasses was studied. The structure of studied glasses was described by the thermodynamic model of Shakhmatkin and Vedishcheva. Thermodynamic modeling resulted in eight components with significant abundance in the studied glasses, i.e. SiO ₂ , 2MgO·SiO ₂ , MgO·SiO ₂ ...

article

Preparation and adsorption kinetics and thermodynamics of sodium humate‐modified diatomite

Hongye Chen, Ruqin Gao, Qiuhui Ma

International Journal of Applied Ceramic Technology > 21 > 3 > 1395 - 1407

Diatomaceous earth has been used as a nonorganic carrier to prepare a sodium humate modified diatomaceous space using the sol‐gel method. X‐ray diffraction, field emission scanning electron microscopy, transmission electron microscope, the Brunauer–Emmett–Teller (BET) method, and other methods were used to characterize its physio‐chemical properties. The effects of sodium humate/diatomite on the pH...

article

Optimized Tunability of Barium Strontium Titanate Thin Films onto Different Plates with Proper Buffer Layers

Hanting Dong, Liang Ke, Xiangjun Hui, Jiangfeng Mao, more

physica status solidi (b) > 260 > 2 > n/a - n/a

Misfit strain, polarization, permittivity, and tunability of Ba_xSr_1−xTiO₃ (BST) thin films on various substrates with varied buffer layers are calculated by a modified thermodynamic model. The lattice parameters of the LaAlO₃ (LAO), CaTiO₃ (CT), BaZr_0.25Ti_0.75O₃ (BZT), and MgO buffer layers grow consecutively as does the thermal expansion coefficient (TEC) of the Si, Ti, Ni, and stainless steel...

article

Thermodynamic Analysis of Precipitation Process of Complex Carbonitride TixV1-xCyN1-y in HSLA-Type Steel

Anna Wojtacha, Marek Opiela

Advances in Science and Technology. Research Journal > 2022 > Vol. 16, no 4 > 64--73

The paper presents a detailed analysis of the MX-type interstitial phase precipitation process and a thermodynamic analysis of the TixV1-xCyN1-y carbonitride precipitation in austenite. The subject of research analysis was the newly developed HSLA-type steel containing 0.175% C, 1.02% Si, 1.87% Mn, 0.0064% N, 0.22% Mo, and microadditions 0.022% V and 0.031% Ti. Analysis of the process of precipitation...

article

Cuprous‐based composite ionic liquids for the selective absorption of CO: Experimental study and thermodynamic analysis

Duan‐Jian Tao, Xue‐Cong An, Zi‐Teng Gao, Zhang‐Min Li, more

AIChE Journal > 68 > 5 > n/a - n/a

Three cuprous‐based composite ionic liquids (ILs) [EimH][OAc]–xCuOAc (x = 0.5, 0.6, 0.7) were prepared and employed for efficient absorption of CO. It is shown that the cuprous composite IL [EimH][OAc]–0.6CuOAc exhibited the largest absorption capacity for CO (0.031 g/g at 293.15 K and 1 bar) and had a record CO/N₂ selectivity of 967, which is better than most of common ILs and solvents reported in...

article

Thermodynamic model of ZnO‐Nb₂O₅‐P₂O₅ glasses – parameterization and validation

Marek Liška, Jan Macháček, Mária Chromčíková, Jana Holubová, more

International Journal of Applied Glass Science > 12 > 4 > 581 - 587

On the basis of experimental structural data ten system components were considered in the ZnO‐Nb₂O₅‐P₂O₅ thermodynamic model of Shakhmatkin and Vedishcheva – ZnO, Nb₂O₅, P₂O₅, ZnP₄O₁₁, Zn(PO₃)₂, Zn₂P₂O₇, Zn₃(PO₄)₂, NbO(PO₃)₃, (NbO)₄(P2O₇)₃, and NbOPO₄. The molar Gibbs energies of ZnO, Nb₂O₅, P₂O₅, and Zn₃(PO₄)₂ were taken from the FACT database. The unknown Gibbs energies of the other components were...

article

Development of a novel dual heated cascade supercritical carbon dioxide cycle and performance comparison with existing two configurations for waste heat recovery

Xinxing Lin, Chonghui Chen, Likun Yin, Wen Su, more

International Journal of Energy Research > 45 > 10 > 15389 - 15408

As an efficient method for the waste heat recovery of gas turbine, supercritical carbon dioxide (S‐CO₂) power cycle has gained much attention, due to the high efficiency and compact structure. Thus, in this work, a novel S‐CO₂ power cycle is developed for the waste heat recovery via the modification of dual heated cascade cycle with an intercooler (intercooling cycle). Compared with the dual heated...

article

Modeling of the dynamic characteristics and performance of a four‐cylinder double‐acting Stirling engine

Chin‐Hsiang Cheng, Hang‐Suin Yang, Yi‐Han Tan, Jun‐Hong Li

International Journal of Energy Research > 45 > 3 > 4197 - 4213

In this article, a theoretical model that combines thermodynamic and dynamic models is proposed for predicting the performance and transient behavior of a double‐acting Stirling engine with four cylinders. A thermodynamic model is used for predicting the variation of thermal properties of working fluid. The temperature of a regenerator matrix is also solved. The volume variations of working chamber...

article

Temperature control strategy for polymer electrolyte fuel cells

Yuanxin Qi, Xiufei Li, Shian Li, Tingshuai Li, more

International Journal of Energy Research > 44 > 6 > 4352 - 4365

A polymer electrolyte fuel cell (PEFC) is an electrochemical device that converts chemical energy directly to electrical energy, and its performance greatly depends on its operating temperature. Therefore, in this paper, a novel thermodynamic PEFC model with the airflow cooling method is firstly developed for the PEFC system. Then, a novel model predictive control (MPC) controller is designed to control...

article

Models using in metallurgical process management

Pavlina Pustĕjovska, Edyta Kardas, Radek Toman, Dominik Bařina, more

Zarządzanie Przedsiębiorstwem > 2020 > Vol. 23, nr 3 > 16--19

The paper presents the possibilities of the application of different models for blast furnace operation management: thermodynamic and kinetic models and also coke degradation model. Thermodynamic and kinetic approaches in modelling metallurgical processes form are necessary basis for continuous analysis of the conditions under which the evaluated iron technology can actually work while achieving the...

article

Study and modeling of the liquid–solid equilibrium of the KCl–KNO₃–HCl–H₂O system at 283.15 K

Houpeng Wang, Zhiyong Zhou, Wei Qin, Yigui Li, more

AIChE Journal > 66 > 1 > n/a - n/a

In this work, the liquid–solid equilibrium of the KCl–KNO₃–HCl–H₂O system at 283.15 K was investigated. To calculate the solubility product constants of KCl and KNO₃ in HCl solution, the Pitzer equation was used to calculate the activity coefficient of the ionic species in aqueous solution. In addition, the thermodynamic model with the Pitzer equation was constructed to regress the temperature coefficient...

article

Comparison of model predictive controller and optimized min-max algorithm for turbofan engine fuel control

Morteza Montazeri-Gh, Ali Rasti

Journal of Mechanical Science and Technology > 2019 > 33 > 11 > 5483-5498

Min-max selector structure is traditionally used as the industrial control architecture of commercial turbofan engines. However, recent studies indicate that this structure with linear compensators suffers from lack of safety guarantee in fast demands. On the other hand, model predictive control (MPC) technique, which incorporates input/output constraints in its optimization process, has the potential...

article

The Generalized Local Composition Model: Its Features and Limitations

N. A. Kovalenko

Russian Journal of Physical Chemistry A > 2019 > 93 > 10 > 1918-1922

The possibility of using the four-parameter generalized local composition model (GLCM) for systems of different types is examined. Based on the results from describing the GLCM of aqueous alcoholic solutions, separating (immiscible) water/organic systems with low mutual solubility, and solutions of macromolecules, it is concluded that the model can describe the properties of solutions with pronounced...

article

Effects of alloying elements on thermal conductivity of pearlitic gray cast iron

Gui-quan Wang, Xiang Chen, Yan-xiang Li, Yuan Liu, more

Journal of Iron and Steel Research International > 2019 > 26 > 9 > 1022-1030

A quantitative model is proposed to describe the thermal conductivity of alloyed pearlitic gray cast iron. The model is built by combining the computational thermodynamics and effective medium theory. The volume fractions and concentrations of precipitated phases in as-cast structure are estimated in consideration of partial and para-equilibrium. The conductivity of alloyed ferrite is calculated,...

article

Temperature dependent Grüneisen parameter

Xun Zhang, Sheng Sun, Tao Xu, TongYi Zhang

Science China Technological Sciences > 2019 > 62 > 9 > 1565-1576

Grüneisen parameter is one of the most valuable quantities in thermodynamics, which links the material properties of bulk modulus, heat capacity at constant volume, thermal expansion coefficient, and volume together. A new thermodynamic model of temperature-dependent potential energy is proposed here to investigate the temperature dependent Grüneisen parameter of bulk material. The newly developed...

article

Evaluation of Molar Volume of Silicate Systems Using a Structural Model

Antonio Romero-Serrano, Josué López-Rodríguez, Aurelio Hernández-Ramírez, Miguel Pérez-Labra, more

Glass Physics and Chemistry > 2019 > 45 > 3 > 195-201

A structural based model is proposed to represent the molar volume of silicate melts in terms of both temperature and composition. The model links the molar volume to the internal structure of melts through the concentrations of non-bridging oxygen present in the slag. A previous proposed structural thermodynamic model is used to calculate the content of oxygen ions. The molar volume model requires...

article

An Approximate Model of Heat Treatment and Ignition of Coal in Small Cyclones

P. A. Shchinnikov, A. A. Frantseva, A. I. Dvortsevoy

Thermal Engineering > 2019 > 66 > 7 > 505-512

An approximate physical model of coal heat pretreatment with external heat input in a cyclone-type unit is presented and its governing principles are examined. The model makes it possible to predict the time of moisture release from the fuel (or evaporation), the temperature of gas suspension and of fuel combustion, and the composition and volume of the combustion products. This enables one to determine...

article

Analysis of equilibrium CO₂ solubility and thermodynamic models for aqueous 1‐(2‐hydoxyethyl)‐piperidine solution

Min Xiao, Wenchao Zheng, Helei Liu, Paitoon Tontiwachwuthikul, more

AIChE Journal > 65 > 6 > n/a - n/a

1‐(2‐Hydoxyethyl)‐piperidine (1‐(2HE)‐PP) is a new tertiary amine with desirable properties and can be potentially used to formulate superior absorbents for CO₂ capture. The equilibrium CO₂ solubility of 1‐(2HE)‐PP solution is measured over temperatures from 298 to 333 K, CO₂ partial pressures from 8.1 to 101.3 kPa and initial amine concentrations from 1 to 5 M. Two thermodynamic models, namely semiempirical...

article

A new thermodynamic model for solid metals under elastic deformations

Dalia S. Bertoldi, Pablo Ochoa

Continuum Mechanics and Thermodynamics > 2019 > 31 > 5 > 1425-1437

We present a theoretical model of the free Helmholtz energy (F) for solid metals that incorporates three contributions: the elastic part through a local strain description, the vibrational energy within a quasi-harmonic Einstein model with volume-dependent cohesive energy, and the electronic contribution in the free electron gas setting. To get F, we introduce discrete approximations of the Helmholtz...

article

Analyzing the Influence of Temperature on the Electrophysical Characteristics of a Complementary Pair of Vertical Bipolar Transistors

M. O. Hrapov, A. V. Gluhov, V. A. Gridchin, S. V. Kalinin

Russian Microelectronics > 2018 > 47 > 7 > 472-478

The influence of temperature on the most important electrical parameters of a complementary bipolar pair of vertical transistors is numerically investigated in the thermodynamic and drift-diffusion models. The advantage of the thermodynamic model in analyzing high-power transistors due to the fact that this model takes into account the self-heating effect is demonstrated;. The simulation results are...

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Search results

Thermodynamic model and viscosity of Na2O–MgO–CaO–SiO2 glasses

Preparation and adsorption kinetics and thermodynamics of sodium humate‐modified diatomite

Optimized Tunability of Barium Strontium Titanate Thin Films onto Different Plates with Proper Buffer Layers

Thermodynamic Analysis of Precipitation Process of Complex Carbonitride TixV1-xCyN1-y in HSLA-Type Steel

Cuprous‐based composite ionic liquids for the selective absorption of CO: Experimental study and thermodynamic analysis

Thermodynamic model of ZnO‐Nb₂O₅‐P₂O₅ glasses – parameterization and validation

Development of a novel dual heated cascade supercritical carbon dioxide cycle and performance comparison with existing two configurations for waste heat recovery

Modeling of the dynamic characteristics and performance of a four‐cylinder double‐acting Stirling engine

Temperature control strategy for polymer electrolyte fuel cells

Models using in metallurgical process management

Study and modeling of the liquid–solid equilibrium of the KCl–KNO₃–HCl–H₂O system at 283.15 K

Comparison of model predictive controller and optimized min-max algorithm for turbofan engine fuel control

The Generalized Local Composition Model: Its Features and Limitations

Effects of alloying elements on thermal conductivity of pearlitic gray cast iron

Temperature dependent Grüneisen parameter

Evaluation of Molar Volume of Silicate Systems Using a Structural Model

An Approximate Model of Heat Treatment and Ignition of Coal in Small Cyclones

Analysis of equilibrium CO₂ solubility and thermodynamic models for aqueous 1‐(2‐hydoxyethyl)‐piperidine solution

A new thermodynamic model for solid metals under elastic deformations

Analyzing the Influence of Temperature on the Electrophysical Characteristics of a Complementary Pair of Vertical Bipolar Transistors

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