Journal of Thermodynamics最新文献_第3页

Influence of Exhaust Gas Recirculation, and Injection Timing on the Combustion, Performance and Emission Characteristics of a Cylinder Head Porous Medium Engine 废气再循环及喷射正时对气缸盖多孔介质发动机燃烧、性能及排放特性的影响

Journal of Thermodynamics Pub Date : 2015-10-12 DOI: 10.1155/2015/927896

C. Kannan, T. Vijayakumar

引用次数: 1

Effect of Condenser Fouling on Performance of Vapor Compression Refrigeration System 冷凝器结垢对蒸汽压缩制冷系统性能的影响

Journal of Thermodynamics Pub Date : 2015-10-05 DOI: 10.1155/2015/756452

Naveen Solanki, A. Arora, S. Kaushik

{"title":"Effect of Condenser Fouling on Performance of Vapor Compression Refrigeration System","authors":"Naveen Solanki, A. Arora, S. Kaushik","doi":"10.1155/2015/756452","DOIUrl":"https://doi.org/10.1155/2015/756452","url":null,"abstract":"Effect of condenser fouling is evaluated on the performance of a vapour compression system with refrigerants HFO1234yf and HFO1234ze as an alternative to HFC134a. The condenser coolant temperature has been varied between 35 and 40°C to evaluate the effect of fouling at different condenser temperatures. A simulation model is developed in EES for computing the results. The results have been computed by varying condenser conductance. The same has been validated with literature available before calculating the results. It is observed that the condenser fouling has larger effect on compressor power (%) as it increases up to 9.12 for R1234yf and 7.41 for R1234ze, whereas for R134a its value increases up to 7.38. The cooling capacity (%) decreases up to 13.25 for R1234yf and 8.62 for R1234ze, whereas for R134a its value decreases up to 8.76. The maximum percentage of decrease in value of COP is up to 19.29 for R1234yf and 14.47 for R1234ze, whereas for R134a its value decreases up to 14.49. The second-law efficiency is also observed to decrease with decrease in the condenser conductance. The performance of HFO1234ze is found to be better under fouled conditions in comparison to R134a and R1234yf.","PeriodicalId":17290,"journal":{"name":"Journal of Thermodynamics","volume":"5 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2015-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78428531","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

Volumetric Behavior of Binary Mixtures of Alkoxyethanols and Some Selected Amines at 298.15 K 298.15 K时烷氧乙醇和某些选定胺二元混合物的体积行为

Journal of Thermodynamics Pub Date : 2015-02-23 DOI: 10.1155/2015/782138

A. Kemeakegha, G. .. Cookey, W. L. Izonfuo

{"title":"Volumetric Behavior of Binary Mixtures of Alkoxyethanols and Some Selected Amines at 298.15 K","authors":"A. Kemeakegha, G. .. Cookey, W. L. Izonfuo","doi":"10.1155/2015/782138","DOIUrl":"https://doi.org/10.1155/2015/782138","url":null,"abstract":"Densities of binary mixtures of 2-methoxyethanol (2-MeO-EtOH) and 2-ethoxyethanol (2-EtO-EtOH) with hexylamine (HLA), diethylamine (DEA), triethylamine (TEA), tert-butylamine (TBA), aniline (ANL), and benzylamine (BLA) have been determined at varying compositions of the alkoxyalkanols at 298.15 K. The excess molar volumes, VE, of the binary mixtures were calculated from the experimental density data of the mixtures and the component single solvents. The calculated excess molar volumes were fitted into the Redlich-Kister polynomial to obtain the fitting coefficients and standard deviations. The excess molar volumes of the binary mixtures of all the solvent systems investigated were negative over the entire range of the solvents composition. The negative values were attributed to stronger hydrogen bond formations between the unlike molecules of mixtures than those between the like molecules of the pure components. The magnitude of the excess molar volumes of the binary mixtures of 2-methoxyethanol and the aliphatic amines were in the order TBA > TEA > DEA > HEA. For the two aromatic amines, the magnitudes were in the order BLA > ANL. For binary mixtures of the amines and 2-ethoxyethanol, the magnitudes were in the order DEA > TEA > TBA > HEA at compositions where the mole fraction of 2-EtO-EtOH was ≤0.5 and TBA > TEA > DEA > HEA above 0.5 mole fraction of 2-EtO-EtOH.","PeriodicalId":17290,"journal":{"name":"Journal of Thermodynamics","volume":"5 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2015-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85096499","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: 10

Symmetry Properties of Reciprocity Relations and Conditions for Minimum Entropy Production Law (In)validity 互易关系的对称性及最小熵产生律有效的条件

Journal of Thermodynamics Pub Date : 2015-02-23 DOI: 10.1155/2015/952343

M. Štrunc, M. Kheilová

引用次数: 1

Gibbs Thermodynamics of the Renninger-Wilemski Problem Renninger-Wilemski问题的Gibbs热力学

Journal of Thermodynamics Pub Date : 2015-02-11 DOI: 10.1155/2015/639572

V. Kurasov

引用次数: 3

Thermoacoustic, Volumetric, and Viscometric Investigations in Binary Liquid System of Cyclohexanone with Benzyl Benzoate at T = 308.15, 313.15, and 318.15 K 在T = 308.15、313.15和318.15 K条件下环己酮与苯甲酸苄酯二元液体体系的热声、体积和粘度研究

Journal of Thermodynamics Pub Date : 2014-12-29 DOI: 10.1155/2014/487403

S. Nayeem, M. Kondaiah, K. Sreekanth, D. Rao

{"title":"Thermoacoustic, Volumetric, and Viscometric Investigations in Binary Liquid System of Cyclohexanone with Benzyl Benzoate at T = 308.15, 313.15, and 318.15 K","authors":"S. Nayeem, M. Kondaiah, K. Sreekanth, D. Rao","doi":"10.1155/2014/487403","DOIUrl":"https://doi.org/10.1155/2014/487403","url":null,"abstract":"Ultrasonic velocities (), densities (), and viscosities () of binary liquid mixtures of cyclohexanone with benzyl benzoate, including pure liquids, over the entire composition range have been measured at 308.15 K, 313.15 K, and 318.15 K. Using the experimental results, parameters such as molar volume (), isentropic compressibility (), intermolecular free length (), acoustic impedance (), internal pressure (), enthalpy (), Gibbs free energy of activation of viscous flow (), and excess/deviation properties of these including partial molar volumes ( and ), excess partial molar volumes ( and ), partial molar volume of the components at infinite dilution (, ), and excess partial molar volume at infinite dilution (and ) have been computed. The observed negative values of , , , and and positive values of , , , , and for all the liquid mixtures studied clearly indicate the presence of strong dipole-dipole-type interactions, fitting of smaller molecules into bigger molecules. Further theoretical values of sound velocity and viscosity in the mixtures have been evaluated using various theories and have been compared with experimental values to verify the applicability of such theories to the systems studied.","PeriodicalId":17290,"journal":{"name":"Journal of Thermodynamics","volume":"27 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84849239","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: 25

Towards the Equation of State for Neutral (C2H4), Polar (H2O), and Ionic ([bmim][BF4], [bmim][PF6], [pmmim][Tf2N]) Liquids 中性(C2H4)、极性(H2O)和离子型([bmim][BF4]、[bmim][PF6]、[pmmim][Tf2N])液体的状态方程

Journal of Thermodynamics Pub Date : 2014-12-16 DOI: 10.1155/2014/496835

V. Rogankov, V. Levchenko

{"title":"Towards the Equation of State for Neutral (C2H4), Polar (H2O), and Ionic ([bmim][BF4], [bmim][PF6], [pmmim][Tf2N]) Liquids","authors":"V. Rogankov, V. Levchenko","doi":"10.1155/2014/496835","DOIUrl":"https://doi.org/10.1155/2014/496835","url":null,"abstract":"Despite considerable effort of experimentalists no reliable vapor-liquid coexistence at very small pressures and liquid-solid coexistence at high pressures have been until now observed in the working range of temperature / for ionic liquids. The measurements of high-pressure properties in low-temperature stable liquid are relatively scarce while the strong influence of their consistency on the phase equilibrium prediction is obvious. In this work we discuss the applicability of fluctuational-thermodynamic methodology and respective equation of state to correlate the properties of any (neutral, polar, ionic) liquids since our ultimate goal is the simple reference predictive model to describe vapor-liquid, liquid-liquid, and liquid-solid equilibria of mixtures containing above components. It is shown that the inconsistencies among existing volumetric measurements and the strong dependence of the mechanical and, especially, caloric derived properties on the shape of the functions chosen to fit the experimental data can be resolved in the framework of fluctuational-thermodynamic equation of state. To illustrate its results the comparison with the known experimental data for [bmim][BF4] and [bmim][PF6] as well as with the lattice-fluid equation of state and the methodology of thermodynamic integration is represented. It corroborates the thermodynamic consistency of predictions and excellent correlation of derived properties over the wide range of pressures /.","PeriodicalId":17290,"journal":{"name":"Journal of Thermodynamics","volume":"46 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"2014-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73263476","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

Entropy Growth Is the Manifestation of Spontaneity 熵增长是自发性的表现

Journal of Thermodynamics Pub Date : 2014-12-07 DOI: 10.1155/2014/387698

Lin-shu Wang

{"title":"Entropy Growth Is the Manifestation of Spontaneity","authors":"Lin-shu Wang","doi":"10.1155/2014/387698","DOIUrl":"https://doi.org/10.1155/2014/387698","url":null,"abstract":"Every student of thermodynamics grasps entropy growth in terms of dissipation of energy. The real nature of energy and entropy is subtle. This critical review of the evolution of thermodynamic thought uncovers the remarkable advance on our understanding of energy made by Kelvin with his dissipation of energy proposition. Maxwell and Planck, however, pointed out that dissipation of energy does not exhaust growth of entropy (i.e., the idea of spontaneity), and in fact, as it is shown here, Kelvin’s proposition of dissipation of energy (1852) is subsumed under the principle of the increase of entropy (Clausius, 1865). It is necessary, therefore, for thermodynamics to become a coherent conceptual system, to introduce spontaneity as an independent concept. Instead of the heat-work dyad framework, the introduction of spontaneity entails energy transformation to be viewed in terms of a triad framework of heat (from the reservoir)-work-spontaneity. Spontaneity is the new energy in the triad framework, and it is also clear that energy commodity (fungible energy or energy carriers) is only one kind of spontaneity, stock spontaneity; the other kind is ongoing spontaneity, the consideration of which is necessary for comprehending problems of homeostasis in both the organic and inorganic worlds.","PeriodicalId":17290,"journal":{"name":"Journal of Thermodynamics","volume":"26 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80842899","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

Separation of Methylene Blue Dye from Aqueous Solution Using Triton X-114 Surfactant Triton X-114表面活性剂对亚甲基蓝染料水溶液的分离

Journal of Thermodynamics Pub Date : 2014-12-02 DOI: 10.1155/2014/670186

Arunagiri Appusamy, P. Purushothaman, K. Ponnusamy, A. Ramalingam

{"title":"Separation of Methylene Blue Dye from Aqueous Solution Using Triton X-114 Surfactant","authors":"Arunagiri Appusamy, P. Purushothaman, K. Ponnusamy, A. Ramalingam","doi":"10.1155/2014/670186","DOIUrl":"https://doi.org/10.1155/2014/670186","url":null,"abstract":"In this study, the interaction energy between Triton X-114 surfactant + methylene blue or water and methylene blue + water was investigated using Hartree-Fock (HF) theory with 6- basis set. The results of structures and interaction energies show that these complexes have good physical and chemical interactions at atom and molecular levels. However, the Triton X-114 surfactant + methylene blue complex shows stronger molecular interaction compared to other complexes systems. The order of the interaction energy is 4303.472023 (Triton X-114 surfactant + water) > 1222.962 (methylene blue + water) > 3573.28 (Triton X-114 surfactant + methylene blue) kJ·mole−1. Subsequently, the cloud point extraction was carried out for 15 ppm of methylene blue in a mixture at 313.15 and 323.15 K over the surfactant concentration range from 0.01 M to 0.1 M. From the measured data, the excess molar volume was calculated for both phases. The results show a positive deviation in the dilute phase and a negative deviation in the surfactant rich phase. It is confirmed that the interaction between Triton X-114 and methylene blue is stronger than other complex systems due to the presence of chemical and structural orientation. The concentration of dyes and surfactant in the feed mixture and temperature effect in both phases has been studied. In addition, the thermodynamics feasibility and efficiency of the process have also been investigated.","PeriodicalId":17290,"journal":{"name":"Journal of Thermodynamics","volume":"11 1","pages":"1-16"},"PeriodicalIF":0.0,"publicationDate":"2014-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84302024","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: 7

Thermohydraulic Performance of a Series of In-Line Noncircular Ducts in a Parallel Plate Channel 平行板槽内串联非圆形管道的热水力性能

Journal of Thermodynamics Pub Date : 2014-09-21 DOI: 10.1155/2014/670129

Siddharth D. Mhaske, Soby P. Sunny, S. L. Borse, Yash Parikh

引用次数: 0