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The Open Thermodynamics Journal最新文献

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Design Charts for Circular Fins of Arbitrary Profile Subject to Radiation and Convection with Wall Resistances 受壁阻辐射和对流作用的任意截面圆鳍的设计图
The Open Thermodynamics Journal Pub Date : 2012-09-18 DOI: 10.2174/1874396X01206010015
G. Zhang, B. Chung
{"title":"Design Charts for Circular Fins of Arbitrary Profile Subject to Radiation and Convection with Wall Resistances","authors":"G. Zhang, B. Chung","doi":"10.2174/1874396X01206010015","DOIUrl":"https://doi.org/10.2174/1874396X01206010015","url":null,"abstract":"In this work, the optimization for a radiative-convective annular fin of arbitrary profile with base wall thermal resistances is considered. A fourth order Runge-Kutta method is used to solve the associated non-linear governing equa- tions. Further differentiations yield the optimum heat transfer and the optimum fin dimensions. To facilitate the thermal design, design charts for optimum dimensions are proposed. Furthermore, the fin effectiveness for the optimal annular ra- diative-convective fins is presented to check the practicality of the design.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116849380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Teaching the Third Law of Thermodynamics 教授热力学第三定律
The Open Thermodynamics Journal Pub Date : 2012-06-29 DOI: 10.2174/1874396X01206010001
A. Klimenko
{"title":"Teaching the Third Law of Thermodynamics","authors":"A. Klimenko","doi":"10.2174/1874396X01206010001","DOIUrl":"https://doi.org/10.2174/1874396X01206010001","url":null,"abstract":"This work gives a brief summary of major formulations of the third law of thermodynamics and their implications, including the impossibility of perpetual motion of the third kind. The last sections of this work review more advanced applications of the third law to systems with negative temperatures and negative heat capacities. The relevance of the third law to protecting the arrow of time in general relativity is also discussed. Additional information, which may be useful in analysis of the third law, is given in the Appendices. This short review is written to assist lecturers in selecting a strategy for teaching the third law of thermodynamics to engineering and science students. The paper provides a good summary of the various issues associated with the third law, which are typically scattered over numerous research publications and not discussed in standard textbooks.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"54 14","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113933801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
Correlation of Solute Transfer Into Toluene and Ethylbenzene from Water and from the Gas Phase Based on the Abraham Model 基于亚伯拉罕模型的溶质从水和气相向甲苯和乙苯转移的相关性
The Open Thermodynamics Journal Pub Date : 2011-12-30 DOI: 10.2174/1874396X01105010104
Timothy W. Stephens, M. Loera, Amanda N. Quay, Vicky Chou, C. Shen, Anastasia Wilson, W. Acree, M. Abraham
{"title":"Correlation of Solute Transfer Into Toluene and Ethylbenzene from Water and from the Gas Phase Based on the Abraham Model","authors":"Timothy W. Stephens, M. Loera, Amanda N. Quay, Vicky Chou, C. Shen, Anastasia Wilson, W. Acree, M. Abraham","doi":"10.2174/1874396X01105010104","DOIUrl":"https://doi.org/10.2174/1874396X01105010104","url":null,"abstract":"Experimental data have been compiled from the published literature on the partition coefficients of solutes and vapors into ethylbenzene and toluene at 298 K. The logarithms of the water-to-ethylbenzene and water-to-toluene partition coefficients, log P, and gas-to-ethylbenzene and gas-to-toluene partition coefficients, log K, were correlated with the Abraham solvation parameter model. The derived mathematical expressions described the observed log P and log K data for the two aromatic hydrocarbon solvents to within average deviations of 0.13 log units or less.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115574794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
A New Look at Optimum Design for Convecting-Radiating Annular Fins of Trapezoidal Profile 对梯形截面辐合环形翅片优化设计的新认识
The Open Thermodynamics Journal Pub Date : 2011-11-29 DOI: 10.2174/1874396X01105010093
B. Chung
{"title":"A New Look at Optimum Design for Convecting-Radiating Annular Fins of Trapezoidal Profile","authors":"B. Chung","doi":"10.2174/1874396X01105010093","DOIUrl":"https://doi.org/10.2174/1874396X01105010093","url":null,"abstract":"This paper deals with a controversial problem in answering the question \"Does the optimum fin design always exist? If not, what are the optimization ranges and limitations?\" These authors employ a general example of convecting- radiating trapezoidal annular fin with heat transfer at the tip and wall resistance at the interface. The present results indicate that the answer to the above first question is negative. The ranges of fin optimum design under different thermal and physical conditions are proposed. The effects of Biot number, radiation number, the heat loss at the tip, fin profile and overall wall resistance on fin optimization range are further investigated and discussed.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"2017 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134443955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
EDITORIAL - Phase Equilibrium Challenges and Modern Practice 编辑-相平衡的挑战和现代实践
The Open Thermodynamics Journal Pub Date : 2011-11-04 DOI: 10.2174/1874396X01105010016
R. Stateva
{"title":"EDITORIAL - Phase Equilibrium Challenges and Modern Practice","authors":"R. Stateva","doi":"10.2174/1874396X01105010016","DOIUrl":"https://doi.org/10.2174/1874396X01105010016","url":null,"abstract":"Thermodynamic modeling and phase equilibria are at the heart of chemical process design. For example, (70 to 90) % of the equipment and energy costs in modern chemical plants are related to separation and purification processes and they are designed largely on the basis of thermodynamic equilibrium. More importantly, new chemical engineering processes often involve multicomponent, non-ideal system, which can exhibit a variety of possible phase equilibria. Furthermore, the processes are often performed at pressures and temperatures near the critical point or near the phase boundary, which further complicates the solution of the phase equilibrium problem. Last, but not least, phase equilibria calculations are executed nowadays not only as stand-alone calculations, but also as a part of a more general simulation, synthesis or design case, performed by a process simulator, where they are run thousands of times. In these cases the reliability and robustness of phase equilibria calculations is of utmost importance since their failure at any stage will disrupt completely the solution process.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130992475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prediction of Phase Behavior for the System Methane-Carbon Dioxide- Hydrogen Sulfide-Water with the PR and PC-SAFT Equations of State 用PR和PC-SAFT状态方程预测甲烷-二氧化碳-硫化氢-水体系的相行为
The Open Thermodynamics Journal Pub Date : 2011-11-04 DOI: 10.2174/1874396X01105010063
German A. Avila-Mendez, D. Justo-García, Fernando arcia-Sanchez, B. E. García-Flores
{"title":"Prediction of Phase Behavior for the System Methane-Carbon Dioxide- Hydrogen Sulfide-Water with the PR and PC-SAFT Equations of State","authors":"German A. Avila-Mendez, D. Justo-García, Fernando arcia-Sanchez, B. E. García-Flores","doi":"10.2174/1874396X01105010063","DOIUrl":"https://doi.org/10.2174/1874396X01105010063","url":null,"abstract":"In this work, we present the predicted multiphase behavior (vapor-liquid, liquid-liquid, and vapor-liquid-liquid equilibria) for a quaternary mixture containing methane, carbon dioxide, hydrogen sulfide, and water. The capabilities of the PR (Peng-Robinson) and PC-SAFT (Perturbed-Chain Statistical Associating Fluid Theory) equations of state (EoS) to predict the phase behavior exhibited by this mixture were compared and analyzed. The computer algorithm used for isothermal multiphase flash calculations is based on the minimization of the Gibbs energy along with stability analysis to find the most stable state of the system. The binary interaction parameters used with the PR EoS for modeling this system were taken from the literature whereas the interaction parameters for the PC-SAFT were obtained from the regression of binary vapor-liquid equilibrium data. The results obtained differ from each other and demonstrate different capabilities and accuracies of the present thermodynamic models in the predictions.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115396198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Analysis of Predictive Thermodynamic Models for Estimation of Polycyclic Aromatic Solid Solubility in Hot Pressurized Water 多环芳烃固体在热压水中溶解度的预测热力学模型分析
The Open Thermodynamics Journal Pub Date : 2011-11-04 DOI: 10.2174/1874396X01105010040
T. Fornari, E. Ibáñez, G. Reglero, R. Stateva
{"title":"Analysis of Predictive Thermodynamic Models for Estimation of Polycyclic Aromatic Solid Solubility in Hot Pressurized Water","authors":"T. Fornari, E. Ibáñez, G. Reglero, R. Stateva","doi":"10.2174/1874396X01105010040","DOIUrl":"https://doi.org/10.2174/1874396X01105010040","url":null,"abstract":"The ability of two thermodynamic approaches to predict the solubility of solid compounds in hot pressurized water is studied and compared. The Regular Solution Theory, based on the solubility parameter concept, and UNIFAC- based models were applied to calculate the solute activity coefficient and then, solubility predictions were compared with experimental data reported in the literature. The analysis was carried out considering polycyclic aromatic hydrocarbons as model substances, i.e. substances which contain only the aromatic AC and ACH groups, and for which reliable pure physical properties such as melting point, fusion enthalpy and molar volume are available in the literature. The solubility values predicted with the UNIFAC-based models were considerably better than those obtained with the solubility parameter approach. Particularly, the modified Dortmund UNIFAC model presented an appropriate functionality of solubility with temperature, and the extension of this model to other type of aromatic compounds also provided a satisfactory prediction of solubility data.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128311619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Some Observations Regarding the SAFT-VR-Mie Equation of State 关于SAFT-VR-Mie状态方程的一些观察
The Open Thermodynamics Journal Pub Date : 2011-11-04 DOI: 10.2174/1874396X01105010018
V. Kalikhman, D. Kost, I. Polishuk
{"title":"Some Observations Regarding the SAFT-VR-Mie Equation of State","authors":"V. Kalikhman, D. Kost, I. Polishuk","doi":"10.2174/1874396X01105010018","DOIUrl":"https://doi.org/10.2174/1874396X01105010018","url":null,"abstract":"This study demonstrates that the advanced theoretical basis and the consequential numerical complexity do not always guarantee the success of EOS models in predicting the experimental thermodynamic property data. Although one of the best versions of SAFT, namely SAFT-VR-Mie might have doubtless advantages in predicting the data of non- spherical molecules, once again it is shown that there is a price to pay for the excessive model's complexity. In particular, the present study reveals a previously unnoticed kind of numerical pitfalls, yet generated by the chain term of the SAFT- VR-Mie EOS. A possible way of avoiding the numerical pitfall under consideration is proposed.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123035647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
A review on global optimization methods for phase equilibrium modeling and calculations 相平衡建模与计算的全局优化方法综述
The Open Thermodynamics Journal Pub Date : 2011-11-04 DOI: 10.2174/1874396X01105010071
Haibo Zhang, A. Bonilla-Petriciolet, G. P. Rangaiah
{"title":"A review on global optimization methods for phase equilibrium modeling and calculations","authors":"Haibo Zhang, A. Bonilla-Petriciolet, G. P. Rangaiah","doi":"10.2174/1874396X01105010071","DOIUrl":"https://doi.org/10.2174/1874396X01105010071","url":null,"abstract":"The phase equilibrium modeling for multi-component systems is essential in process systems engineering. In particular, phase stability analysis, Gibbs free energy minimization and estimation of parameters in thermodynamic models are challenging global optimization problems involved in phase equilibrium calculations and modeling for both reactive and non-reactive systems. To date, many significant works have been performed in the area of global optimization, and several algorithms and computational contributions of global optimization have been used for solving these problems; global optimization methods used include both deterministic and stochastic algorithms. To the best of our knowledge, there is no review in the literature that focuses on the global optimization methods and their applications to phase equilibrium modeling and calculations. In this paper, we briefly describe selected deterministic and stochastic optimization algorithms, and then review their use for phase stability analysis, Gibbs free energy minimization and parameter estimation in phase equilibrium models. In short, we provide a general overview of global optimization for modeling and calculating the phase behavior of systems with and without chemical reactions including the prediction of azeotropes and critical points.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127615895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 64
Analysis and Refinement of the TRC-QSPR Method for Vapor Pressure Prediction 蒸汽压预测的TRC-QSPR方法分析与改进
The Open Thermodynamics Journal Pub Date : 2011-11-04 DOI: 10.2174/1874396X01105010029
Inga Paster, N. Brauner, M. Shacham
{"title":"Analysis and Refinement of the TRC-QSPR Method for Vapor Pressure Prediction","authors":"Inga Paster, N. Brauner, M. Shacham","doi":"10.2174/1874396X01105010029","DOIUrl":"https://doi.org/10.2174/1874396X01105010029","url":null,"abstract":"Various aspects associated with the use of the TRC-QSPR method (Shacham et al., Ind. Eng. Chem. Res. 49, 900-912, 2010, Ref. (1)) for the prediction of vapor pressure are investigated using a test set of 12 compounds from the n- alkane series. This test set is used to check the consistency of the parameter values of the Wagner and Riedel equations and the resulting vapor pressure values in the full range between the triple point and critical point. Inconsistency has been detected in the parameters of the commonly used version of the Riedel equation as well as the calculated vapor pressure values near the critical point, TR >0.9. Vapor pressures prediction studies are carried out for the cases of interpolation, short and long range extrapolation and using either the acentric factor (�), or number of C atoms (nC ), or the VEA1 descriptor in the TRC-QSPR equation. It is concluded that the prediction error is the lowest and within the experimental error limits over the entire temperature range, using the Wagner's equation andwithin the TRC-QSPR framework. Replacingby nC or by the descriptor VEA1 increases the prediction error, however good prediction accuracy is retained in the regions where experimental data are available for the predictive compounds. It is demonstrated that reliable vapor pressure predictions can be obtained using only nC for characterization of the target compound.","PeriodicalId":238681,"journal":{"name":"The Open Thermodynamics Journal","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123302770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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