International Journal of Thermodynamics最新文献_第10页

Enriched Oxygen for Crude Oil Preheating in Petroleum Refining 富氧用于石油炼制中原油预热

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-05-26 DOI: 10.5541/IJOT.880620

Y. Alqaheem, Abdulaziz A. Alomair

引用次数: 1

An Endoreversible Model for the Regenerators of Vuilleumier Refrigerators 维勒米耶制冷机蓄热器的内可逆模型

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International Journal of Thermodynamics Pub Date : 2021-05-26 DOI: 10.5541/IJOT.877687

R. Paul, A. Khodja, K. Hoffmann

引用次数: 9

Evaluation of Cancer Progression Using Dynamic Entropy Changes and Thermography 利用动态熵变和热成像技术评估癌症进展

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International Journal of Thermodynamics Pub Date : 2021-05-26 DOI: 10.5541/IJOT.885583

M. K. Manesh, A. Rezazadeh, Tayebeh Modaresi Movahed, H. Mirzaei

{"title":"Evaluation of Cancer Progression Using Dynamic Entropy Changes and Thermography","authors":"M. K. Manesh, A. Rezazadeh, Tayebeh Modaresi Movahed, H. Mirzaei","doi":"10.5541/IJOT.885583","DOIUrl":"https://doi.org/10.5541/IJOT.885583","url":null,"abstract":"Entropy is producing during any irreversible process. In the cancer cells, the entropy generation measures the irreversibility; so, the cancer cells have higher entropy generation than the healthy cells. The entropy generation rate shows the amount of robustness, progression, and invasion of the cancer cells. From a thermodynamic aspect, cancer's origin and growth is an irreversible process, and the thermodynamic variables such as the cell volume, temperature, and entropy will change during this process. In this paper, a procedure based on experimental data is proposed to calculate dynamic entropy generation in the tumoral tissues by dynamic thermography and measurement of tumor size. The dynamic changes in the volume, temperature, and entropy associated with tumor cells over time are tested and evaluated in this regard. An in vivo assay has been developed to measure and analyze these changes. This assay investigated the growth of 4T1 Breast Tumor in 55 BALB/c mice over time. Infrared thermography has been employed to evaluate dynamic temperature changes of the tumors. The computer code has been developed to gather important data from tumoral and healthy mice's images to compute considered temperature differences and entropy generation associated with tumoral tissues. To better evaluate tumor tissue, the Micro PET Images are used to verify volume changes of tumors. The relation between the volume and temperature gradient of tumor cells has detected by measuring during the experiment. The entropy of tumor cells was studying and calculating during the process of tumor changes. Results show that entropy generation as the main concept of thermodynamic is a strong tool for the analysis of cancer cells and has a strong relationship with cancer growth.","PeriodicalId":14438,"journal":{"name":"International Journal of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44929132","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

Augmentation on Heat Transfer and Friction Factor in Three Sides Solar Air Heaters Having an Arrangement of Multi-V and Transverse Wire Roughness on the Absorber Plate 多v布置和吸收板横向钢丝粗糙度对三面太阳能空气加热器传热和摩擦系数的增强

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-05-26 DOI: 10.5541/IJOT.796532

Dhananjay Kumar, L. Prasad

{"title":"Augmentation on Heat Transfer and Friction Factor in Three Sides Solar Air Heaters Having an Arrangement of Multi-V and Transverse Wire Roughness on the Absorber Plate","authors":"Dhananjay Kumar, L. Prasad","doi":"10.5541/IJOT.796532","DOIUrl":"https://doi.org/10.5541/IJOT.796532","url":null,"abstract":"This paper present the experimental inquiry on heat transfer and friction features enrichment adopting new-fangled of three side’s synthetically rugged rectangular duct solar air heaters (SAHs). The roughened rectangular SAH ducts has been an arrangement of multi-v and transverse wire (top wall multi-v and two side walls transverse) covered with glass on three sides. It has various appliances such as crop drying, seasoning of timber, space heating, industrial purpose, etc. The rectangular duct used has a width to height ratio, W/H, equal to 8, relative raggedness pitch, P/e, wide-ranging from 10 25, relative raggedness height, e/D, varied from 0.018 – 0.042 and flow Reynolds number, Re, occupied from 3500 – 12,000 for fixed values of relative raggedness width, W/w, of 6 and an angle of attack, αα, equal to 60°. The heat transmission and friction features of this roughened duct is compared with plane ones under identical working conditions. The maximum augmentation in heat transmission and friction feature is identified to be 6.42 and 6.44 times over the smooth duct respectively. The enhancement in air temperature streaming under three side’s synthetically rugged SAH duct is found to be 54.47% more than that of the smooth one. Three side’s artificially rugged rectangular duct SAHs are preferable over plane ones collectively and tentatively","PeriodicalId":14438,"journal":{"name":"International Journal of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48950899","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

Energy, exergy, exergoeconomic, and exergoenvironmental analyses and multi-objective optimization of a CPC driven solar combined cooling and power cycle with different working fluids CPC驱动的不同工质太阳能联合冷却与动力循环的能量、火用、能量经济性和能量环境分析及多目标优化

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-05-26 DOI: 10.5541/IJOT.873456

S. Zandi, Kamyar Golbaten Mofrad, Afsane Moradifaraj, G. Salehi

{"title":"Energy, exergy, exergoeconomic, and exergoenvironmental analyses and multi-objective optimization of a CPC driven solar combined cooling and power cycle with different working fluids","authors":"S. Zandi, Kamyar Golbaten Mofrad, Afsane Moradifaraj, G. Salehi","doi":"10.5541/IJOT.873456","DOIUrl":"https://doi.org/10.5541/IJOT.873456","url":null,"abstract":"This paper aims to provide comprehensive 4E (energy, exergy, exergoeconomic, and exergoenvironmental) and advanced exergy analyses of the Refrigeration Cycle (RC) and Heat Recovery Refrigeration Cycle (HRRC) and comparison of the performance with R744 (CO2) and R744A (N2O) working fluids. Moreover, multi-objective optimization of the systems has been considered to define the optimal conditions and the best cycle from various perspectives. In HRRC, heat recovery is used as a heat source for an organic Rankine cycle. The energy and exergy analysis results show that utilizing HRRC with both refrigerants increases the coefficient of performance (COP) and exergy efficiency. COP and exergy efficiency for HRRC-R744 have been obtained 2.82 and 30.7%, respectively. Due to the better thermodynamic performance of HRRC, other analyses have been performed on this cycle. Exergoeconomic analysis results show that using R744A leads to an increase in the total product cost. Total product cost with R744 and R744A have been calculated by 1.56 $/h and 1.96$/h, respectively. Additionally, to obtain the processes' environmental impact, Life Cycle Assessment (LCA) is used. Exergoenvironmental analysis showed that using R744A increases the product environmental impact by 32%. Owning to the high amount of endogenous exergy destruction rate in the compressor and ejector compared to other equipment, they have more priority for improvement. Multi-objective optimization has been performed with exergy efficiency and total product cost objective functions as well as COP and product environmental impact for both refrigerants, which indicates that HRRC-R744 has better performance economically and environmentally. In optimal condition, the value of exergy efficiency, total product cost, COP, and the product environmental impact have been accounted for by 28.51%, 1.44 $/h, 2.76, and 149.01 mpts/h, respectively.","PeriodicalId":14438,"journal":{"name":"International Journal of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45864336","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: 8

Performance and Techno-Economic Analysis of Inlet Fogging System Implementation in Heavy Duty Industrial Gas Turbines 重型工业燃气轮机进气雾化系统的性能及技术经济分析

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-05-26 DOI: 10.5541/IJOT.782485

R. Agbadede, B. Kainga

引用次数: 3

Irreversibility Analysis of R407C, R404A, and R134A as an Alternatives of R22 in Vapor Compression Chiller under Cycling Conditions R407C、R404A和R134A作为R22替代品在循环条件下的不可逆性分析

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-02-28 DOI: 10.5541/IJOT.797614

Ayad Khudhair Al-Nadawi

引用次数: 3

SOLVING THE PROBLEM OF THERMODYNAMIC INEQUALITIES 热力学不等式问题的求解

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-02-28 DOI: 10.5541/IJOT.874737

V. Etkin

{"title":"SOLVING THE PROBLEM OF THERMODYNAMIC INEQUALITIES","authors":"V. Etkin","doi":"10.5541/IJOT.874737","DOIUrl":"https://doi.org/10.5541/IJOT.874737","url":null,"abstract":"It is shown that the combined equation of the 1st and 2nd principles of classical thermodynamics does not transform into inequality in the case of irreversible processes, if the external energy exchange of the system is expressed in terms of energy carrier flows. This means that thermodynamic inequalities are generated by attempts to take into account the irreversibility of real (non-static) processes, without taking into account explicitly its reasons - the inhomogeneity of the system and the presence of internal sources not only for entropy, but also for other parameters. On this basis, exact expressions of heat and work in open nonequilibrium systems, as well as their dissipative function, are obtained. The physical meaning of entropy as a thermal impulse and the unprovability of the principle of its increase in the framework of equilibrium systems are revealed. Non-entropy criteria for evolution are proposed and the latter is shown to be incompatible not only with the second law of thermodynamics, but also with the laws of conservation of energy carriers. The elimination of thermodynamic inequalities opens up the possibility of applying the equations of thermodynamics, taking into account energy dissipation, to other fundamental disciplines.","PeriodicalId":14438,"journal":{"name":"International Journal of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43710930","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

Fractional order heat conduction and thermoelastic response of a thermally sensitive rectangular parallelopiped 热敏矩形平行六面体的分数阶热传导和热弹性响应

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-02-28 DOI: 10.5541/IJOT.849663

V. Srinivas, V. R. Manthena, J. Bikram, G. D. Kedar

{"title":"Fractional order heat conduction and thermoelastic response of a thermally sensitive rectangular parallelopiped","authors":"V. Srinivas, V. R. Manthena, J. Bikram, G. D. Kedar","doi":"10.5541/IJOT.849663","DOIUrl":"https://doi.org/10.5541/IJOT.849663","url":null,"abstract":"In the present paper, the problem of finite dimensional rectangular parallelepiped in isotropic thermoelastic medium with convective type heating is considered. The heat conduction equation (HCE) of the region is described by time HC of fractional order with Caputo derivative form. The non-linear form of heat conduction equation is converted to linear form with Kirchhoff’s transformation. Integral transform technique is used to deal with the spatial variables and Laplace transform technique is used to deal with Caputo type time fractional derivative. Inverse Laplace transform and inverse finite Fourier transform are employed to expose the solution in the transformed domain. Numerical results are obtained for temperature distribution, deflection, stress resultants and thermal stress distribution for different values of time fractional order parameter. These results are presented graphically and discussed for various values of time fractional parameters. The obtained results show significant influence of the time fractional order derivative on the temperature as well as stress distribution. Thermosensitivity plays a vital role in the analysis of any real thermoelastic problems and one should consider their effect while dealing with materials in high temperature environment.","PeriodicalId":14438,"journal":{"name":"International Journal of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48828339","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

Multi-physics evaluation of the steady-state operation of an Aqueous Homogeneous Reactor for producing Mo-99 for the Brazilian demand 为满足巴西需求而生产Mo-99的含水均质反应器稳态运行的多物理场评价

IF 0.8

International Journal of Thermodynamics Pub Date : 2021-02-28 DOI: 10.5541/IJOT.790728

D. M. Pérez, D. Pérez, Liván Hernández Pardo, D. Lorenzo, C. D. O. Lira

{"title":"Multi-physics evaluation of the steady-state operation of an Aqueous Homogeneous Reactor for producing Mo-99 for the Brazilian demand","authors":"D. M. Pérez, D. Pérez, Liván Hernández Pardo, D. Lorenzo, C. D. O. Lira","doi":"10.5541/IJOT.790728","DOIUrl":"https://doi.org/10.5541/IJOT.790728","url":null,"abstract":"The studies summarized in this paper aims to predict the steady state operation of a low-enriched uranium fuel ARGUS type aqueous homogeneous reactor for producing 99Mo to meet the domestic demand of Brazil through a coupled multi-physics (Neutronics + Thermal-hydraulics) evaluation. The coupled multi-physics evaluation included aspects related to the neutronic behavior such as fission induced energy deposition profile, medical isotopes production; and the thermal-hydraulic behavior such as temperature, velocities and gas volume fraction profiles. The methodology followed for the multi-physics and multi-scale coupling of the neutronic and thermal-hydraulic codes (MCNP + ANSYS-CFX), discussed in detail in this paper, represent one of the main outcomes of the current study. The methodology was tested for two different operating configurations of the ARGUS reactor, the original high-enriched uranium configuration used since 1981, and the new low-enriched uranium configuration after the conversion process during 2012-2014. The calculations carried out showed that the reactor, in the studied configuration, is able to produce 246.5 six days Curie of 99Mo in operation cycles of five days. Which is equivalent to more than a third of the estimated Brazilian demand for 2025.","PeriodicalId":14438,"journal":{"name":"International Journal of Thermodynamics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45967103","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