Pub Date : 2020-02-28DOI: 10.15587/1729-4061.2020.196763
N. Romanchenko, V. Romanchenko, N. Kundenko, Yuri Sanin
A heating system for predicting the thermal state, to control and regulate the heating of technologically active zones of production facilities has been proposed. This makes it possible to ensure a high-quality level of compliance with the standards of the thermal mode at production facilities through the use of energy-saving multifunctional systems of a multi-level heating system. At the same time, the heating devices of the resistor type are located below the floor level and their heaters are powered by traditional and non-traditional renewable energy sources.Modeling of thermal processes in the heating system, which was reduced to solving the problem of heat conductivity in the flat layer system, was carried out. A constituent part of this solution is to determine the floor surface temperature as a functional series, which establishes a relationship between the standards of floor surface heating and the power of energy flows in a multilevel heating system. This approach makes it possible to ensure the structural and functional control of energy flows and at the same time ensure the responsiveness and accuracy of compliance with the set standards of the thermal parameters of the microclimate of the technologically active area of industrial facilities for various functional purposes
{"title":"Creating a Micro-Climatic Thermal Mode by the Multilevel System for Heating Industrial Structures","authors":"N. Romanchenko, V. Romanchenko, N. Kundenko, Yuri Sanin","doi":"10.15587/1729-4061.2020.196763","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.196763","url":null,"abstract":"A heating system for predicting the thermal state, to control and regulate the heating of technologically active zones of production facilities has been proposed. This makes it possible to ensure a high-quality level of compliance with the standards of the thermal mode at production facilities through the use of energy-saving multifunctional systems of a multi-level heating system. At the same time, the heating devices of the resistor type are located below the floor level and their heaters are powered by traditional and non-traditional renewable energy sources.Modeling of thermal processes in the heating system, which was reduced to solving the problem of heat conductivity in the flat layer system, was carried out. A constituent part of this solution is to determine the floor surface temperature as a functional series, which establishes a relationship between the standards of floor surface heating and the power of energy flows in a multilevel heating system. This approach makes it possible to ensure the structural and functional control of energy flows and at the same time ensure the responsiveness and accuracy of compliance with the set standards of the thermal parameters of the microclimate of the technologically active area of industrial facilities for various functional purposes","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134397286","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}
The concept of committed warming has been neglected or understated in the climate change conversation, although climate scientists acknowledge that some additional global warming is “baked in” no matter how quickly the world switches to a clean-energy economy. The Earth’s climate is not equilibrated with anthropogenic climate forcing. Ignoring thermal inertia of the oceans, this study shows that stabilizing CO2 concentrations at today’s levels would still commit the earth to at least 0.5oC of additional warming in the next century. Due to past anthropogenic emissions the earth currently absorbs more heat than it emits, which induces a yet unrealized commitment. Even if the CO2 levels stopped increasing, the planet would have to warm further in order to balance solar energy absorbed with energy radiated back to space. This study incorporates a simplified, five-factor model (5FEBM) that uses only known or well-understood factors that drive global warming. These five key factors come close to accounting for the earth’s current radiative imbalance, as well as future temperatures predicted by global climate models. The factors include human greenhouse gas emissions, human generated aerosol emissions, human caused land surface alteration, water vapor feedback, and Planck radiation feedback. Published research on the topic of committed warming mostly corroborates the results of the 5FEBM model. Multiple sources predict a committed warming on the order of 1.5oC relative to pre-industrial conditions. This is particularly relevant to the IPCC’s recent call for more aggressive emission reduction targets to keep total warming below 1.5oC by the end of the 21st century. The evidence herein suggests that may not be possible. Ignoring other feedbacks that will surely worsen, the five factors listed above commit the earth to a global mean surface temperature (GMST) anomaly slightly more than 1.5oC in 2100. A numerical method is developed from the 5FEBM to estimate committed warming under constant concentration conditions. The method is validated by integrating a differential equation involving temperature and time at constant CO2 concentration. The effect of this warming commitment on the year-to-year GMST anomaly is graphed. A sensitivity analysis demonstrates the solution is robust with respect to assumed initial conditions. There is some divergence among estimates of committed warming based partly on assumptions about emissions. Most studies assume constant composition commitment (CCC), but some envision zero emissions. Others assume continued emissions from current fossil fuel investments that would persist through the end of the investments’ useful life. Another scenario admits to an ongoing emissions commitment due to certain energy technologies for which there is currently no commercially available replacement. Presumably, the rationale for estimating committed warming is to portray an idealized but still reasonable picture of the current c
{"title":"Committed Warming Due to Earth’s Radiative Imbalance Using a Simple 5-Factor Energy Balance Model","authors":"Ronn Smith","doi":"10.2139/ssrn.3541353","DOIUrl":"https://doi.org/10.2139/ssrn.3541353","url":null,"abstract":"The concept of committed warming has been neglected or understated in the climate change conversation, although climate scientists acknowledge that some additional global warming is “baked in” no matter how quickly the world switches to a clean-energy economy. The Earth’s climate is not equilibrated with anthropogenic climate forcing. Ignoring thermal inertia of the oceans, this study shows that stabilizing CO2 concentrations at today’s levels would still commit the earth to at least 0.5oC of additional warming in the next century. Due to past anthropogenic emissions the earth currently absorbs more heat than it emits, which induces a yet unrealized commitment. Even if the CO2 levels stopped increasing, the planet would have to warm further in order to balance solar energy absorbed with energy radiated back to space. \u0000 \u0000This study incorporates a simplified, five-factor model (5FEBM) that uses only known or well-understood factors that drive global warming. These five key factors come close to accounting for the earth’s current radiative imbalance, as well as future temperatures predicted by global climate models. The factors include human greenhouse gas emissions, human generated aerosol emissions, human caused land surface alteration, water vapor feedback, and Planck radiation feedback. \u0000 \u0000Published research on the topic of committed warming mostly corroborates the results of the 5FEBM model. Multiple sources predict a committed warming on the order of 1.5oC relative to pre-industrial conditions. This is particularly relevant to the IPCC’s recent call for more aggressive emission reduction targets to keep total warming below 1.5oC by the end of the 21st century. The evidence herein suggests that may not be possible. Ignoring other feedbacks that will surely worsen, the five factors listed above commit the earth to a global mean surface temperature (GMST) anomaly slightly more than 1.5oC in 2100. \u0000 \u0000A numerical method is developed from the 5FEBM to estimate committed warming under constant concentration conditions. The method is validated by integrating a differential equation involving temperature and time at constant CO2 concentration. The effect of this warming commitment on the year-to-year GMST anomaly is graphed. A sensitivity analysis demonstrates the solution is robust with respect to assumed initial conditions. \u0000 \u0000There is some divergence among estimates of committed warming based partly on assumptions about emissions. Most studies assume constant composition commitment (CCC), but some envision zero emissions. Others assume continued emissions from current fossil fuel investments that would persist through the end of the investments’ useful life. Another scenario admits to an ongoing emissions commitment due to certain energy technologies for which there is currently no commercially available replacement. \u0000 \u0000Presumably, the rationale for estimating committed warming is to portray an idealized but still reasonable picture of the current c","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130971239","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}
This paper aims in re-designing an exhaust manifold by determining the thermal stresses and deflections exhibited under various operating conditions with different materials and temperatures. The objective is to ensure the suitability of the design for a particular material from the viewpoint of reliability and serviceability. Defects in the existing manifold are cracks usually occur due to prolonged exposure to extreme temperatures, defects in casting and repeated heat cycling. Welded regions and the curved profiles are the critical regions of failure. A methodology is developed to ensure the best-suited design and material for the given operating conditions. Manifold behavior in Cast Iron is analyzed. Redesigning the curved profiles can reduce the turbulence effect of the exhaust gases on the welds. The software used Creo 3.0 for preparing the CAD model of a 4-1 exhaust manifold.
{"title":"Investigation and Design Modification in Exhaust Manifold","authors":"Amit Chandak","doi":"10.2139/ssrn.3524751","DOIUrl":"https://doi.org/10.2139/ssrn.3524751","url":null,"abstract":"This paper aims in re-designing an exhaust manifold by determining the thermal stresses and deflections exhibited under various operating conditions with different materials and temperatures. The objective is to ensure the suitability of the design for a particular material from the viewpoint of reliability and serviceability. Defects in the existing manifold are cracks usually occur due to prolonged exposure to extreme temperatures, defects in casting and repeated heat cycling. Welded regions and the curved profiles are the critical regions of failure. A methodology is developed to ensure the best-suited design and material for the given operating conditions. Manifold behavior in Cast Iron is analyzed. Redesigning the curved profiles can reduce the turbulence effect of the exhaust gases on the welds. The software used Creo 3.0 for preparing the CAD model of a 4-1 exhaust manifold.","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125804533","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}
In this paper, various solar position parameters to estimate the solar position throughout the year at individual hours have been calculated. A stepwise procedure to calculate various solar parameters like declination angle, hour angle, solar elevation, solar azimuth angles, etc. has also been given. A north eastern city of India, Agartala with latitude 23.80 N and longitude 91.50 E has been chosen as the target location. The equation of time has been calculated in this paper which plays a major role in locating the sun’s position. An algorithm has been designed to calculate the solar parameter angles that specify the sun’s position at any location, at any instant of time. The variations of the respective angles that specify the sun’s position are also given graphically for a particular hour throughout the year.
{"title":"Estimation and Analysis of Solar Parameters in North-East India","authors":"A. Bhowmik, D. Dey, S. Mukherjee","doi":"10.2139/ssrn.3492866","DOIUrl":"https://doi.org/10.2139/ssrn.3492866","url":null,"abstract":"In this paper, various solar position parameters to estimate the solar position throughout the year at individual hours have been calculated. A stepwise procedure to calculate various solar parameters like declination angle, hour angle, solar elevation, solar azimuth angles, etc. has also been given. A north eastern city of India, Agartala with latitude 23.80 N and longitude 91.50 E has been chosen as the target location. The equation of time has been calculated in this paper which plays a major role in locating the sun’s position. An algorithm has been designed to calculate the solar parameter angles that specify the sun’s position at any location, at any instant of time. The variations of the respective angles that specify the sun’s position are also given graphically for a particular hour throughout the year.","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124504048","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}
Pub Date : 2019-09-30DOI: 10.34218/ijaret.10.5.2019.001
Mohammed Fazal Ur Rahman, Prof. Syed Nawazish Mehdi, Praveen Kumar B
In this paper, description of vibration analysis method used for condition monitoring of 500MW steam turbine (Kraftwork Union, Germany) has been discussed. The importance and critical role of this technique in predictive maintenance used in thermal power plant is evaluated based on possible type of failures that can be detected at early stage before any unexpected, unscheduled breakdown during operation of steam turbine.
Efforts are being made for most of the steam turbines in power generation thermal plants to run or operate them at Ideal condition by regular technical consultations resulting in continuous generation of power and reasonable increase in operational life span of these turbines. This paper deals with one such effort. In this paper real time condition monitoring of 500MW turbine, which was carried out by them at NTPC-Ramagundum power plant, using vibration analysis, has been discussed without disturbing its operational working condition and the causes for increase in the vibrations and its practical diagnosis by spectrum analysis, Interpretations and recommended steps to be taken to minimize the vibrations.
{"title":"Performance Optimization of 500MW Steam Turbine by Condition Monitoring Technique Using Vibration Analysis Method","authors":"Mohammed Fazal Ur Rahman, Prof. Syed Nawazish Mehdi, Praveen Kumar B","doi":"10.34218/ijaret.10.5.2019.001","DOIUrl":"https://doi.org/10.34218/ijaret.10.5.2019.001","url":null,"abstract":"In this paper, description of vibration analysis method used for condition monitoring of 500MW steam turbine (Kraftwork Union, Germany) has been discussed. The importance and critical role of this technique in predictive maintenance used in thermal power plant is evaluated based on possible type of failures that can be detected at early stage before any unexpected, unscheduled breakdown during operation of steam turbine.<br><br>Efforts are being made for most of the steam turbines in power generation thermal plants to run or operate them at Ideal condition by regular technical consultations resulting in continuous generation of power and reasonable increase in operational life span of these turbines. This paper deals with one such effort. In this paper real time condition monitoring of 500MW turbine, which was carried out by them at NTPC-Ramagundum power plant, using vibration analysis, has been discussed without disturbing its operational working condition and the causes for increase in the vibrations and its practical diagnosis by spectrum analysis, Interpretations and recommended steps to be taken to minimize the vibrations.","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123782855","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}
Pub Date : 2017-08-30DOI: 10.15587/2313-8416.2017.108935
Vitalij Babak, A. Zaporozhets, O. Nazarenko, O. Redko
The principle of functioning of a bomb calorimeter and methods of determining the heat of fuel combustion are studied. Experimental studies are conducted to determine the heat of combustion of wooden pellets. Based on the conducted studies, potential zones for reducing the time of establishing the results of measuring the bomb calorimeter are shown. The method of reducing the measuring time of heat of fuel combustion is proposed and its probabilistic characteristics are analyzed
{"title":"Аналіз апроксимації результатів вимірюваннь теплового потоку бомбового калориметра в нестаціонарному режимі (Approximation Analysis of Measurement of Heat Flow Bomb Calorimeter in Non-Stationary Mode)","authors":"Vitalij Babak, A. Zaporozhets, O. Nazarenko, O. Redko","doi":"10.15587/2313-8416.2017.108935","DOIUrl":"https://doi.org/10.15587/2313-8416.2017.108935","url":null,"abstract":"The principle of functioning of a bomb calorimeter and methods of determining the heat of fuel combustion are studied. Experimental studies are conducted to determine the heat of combustion of wooden pellets. Based on the conducted studies, potential zones for reducing the time of establishing the results of measuring the bomb calorimeter are shown. The method of reducing the measuring time of heat of fuel combustion is proposed and its probabilistic characteristics are analyzed","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122340336","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}
Hyun Hee Kim, Karam Han, Jihoon Jang, Sang Bin Park, Young Joo Kim, H. Park, Jin K. Park
The possibility of co-firing spent coffee grounds (SCG) with pulverized coal was investigated with a pilot combustion test facility in terms of pulverization performance, combustion and emission characteristics. A coal and two SCG-coal blends having SCG 5 and 10 wt. % in the blend were used for the tests. The thermal behaviors of fuels tested were also evaluated with a thermogrvimetric analyzer.The pyrolysis and combustion behaviors of SCG were very similar to those of woody biomass. The addition of SCG to coal decreased the activation energy of the blend, and improved the reactivity during pyrolysis and combustion. The pilot mill tests showed that SCG-coal blends, compared to coal, produced the higher pressure difference in the mill, and subsequently resulted in the higher mill power consumption, the less amount of fuel pulverized and the finer particle size distribution. The co-firing of SCG with coal improved the burnout of coal and increased gas temperature in the pilot test furnace, and NOx and SOx emissions were somewhat increased, compared to those in solely burning of coal.
{"title":"Possibility of Using Spent Coffee Grounds as a Fuel for Co-Firing Application","authors":"Hyun Hee Kim, Karam Han, Jihoon Jang, Sang Bin Park, Young Joo Kim, H. Park, Jin K. Park","doi":"10.2139/ssrn.3899843","DOIUrl":"https://doi.org/10.2139/ssrn.3899843","url":null,"abstract":"The possibility of co-firing spent coffee grounds (SCG) with pulverized coal was investigated with a pilot combustion test facility in terms of pulverization performance, combustion and emission characteristics. A coal and two SCG-coal blends having SCG 5 and 10 wt. % in the blend were used for the tests. The thermal behaviors of fuels tested were also evaluated with a thermogrvimetric analyzer.The pyrolysis and combustion behaviors of SCG were very similar to those of woody biomass. The addition of SCG to coal decreased the activation energy of the blend, and improved the reactivity during pyrolysis and combustion. The pilot mill tests showed that SCG-coal blends, compared to coal, produced the higher pressure difference in the mill, and subsequently resulted in the higher mill power consumption, the less amount of fuel pulverized and the finer particle size distribution. The co-firing of SCG with coal improved the burnout of coal and increased gas temperature in the pilot test furnace, and NOx and SOx emissions were somewhat increased, compared to those in solely burning of coal.","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122673070","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}
Lili Liu, Cai Chen, Youchang Jiang, Chunjun Shu, Chenglin He
Metasurface-based devices are utilized to achieve high absorption in the determined target frequency band and applied in sensing. The dielectric properties of the vanadium dioxide (VO2) can be modulated by temperature. The development of metasurface devices based on the tunability of VO2 has attracted a lot of attention. In this work, the coupling effect between bright modes results in an absorption peak at 7.71THz at room temperature. This absorption peak is enhanced through optimizing parameters P or D in experiments. As the parameter P increases, the absorption peak is strengthened and moved to high frequencies. Conversely, when the parameter D is increased, this absorption peak is moved to low frequencies. An LC mode is suggested to reveal the influence of structural parameters (P, D) on the absorption properties. Two measured FOM (19.4, and 29) are obtained based on liquid sensing at room temperature. Since the resonance property of the VO2 layer is temperature reversible, the absorption performance of the metasurface is repeatable in the heating and cooling process. In the final experiments, the absorption peak is controlled in the heating and cooling process. Such a metasurface can be applied in liquid sensing and temperature sensing.
{"title":"Active Modulation of Absorption Properties of a Heat-Sensitive Metasurface Based on Vanadium Dioxide","authors":"Lili Liu, Cai Chen, Youchang Jiang, Chunjun Shu, Chenglin He","doi":"10.2139/ssrn.3928097","DOIUrl":"https://doi.org/10.2139/ssrn.3928097","url":null,"abstract":"Metasurface-based devices are utilized to achieve high absorption in the determined target frequency band and applied in sensing. The dielectric properties of the vanadium dioxide (VO2) can be modulated by temperature. The development of metasurface devices based on the tunability of VO2 has attracted a lot of attention. In this work, the coupling effect between bright modes results in an absorption peak at 7.71THz at room temperature. This absorption peak is enhanced through optimizing parameters P or D in experiments. As the parameter P increases, the absorption peak is strengthened and moved to high frequencies. Conversely, when the parameter D is increased, this absorption peak is moved to low frequencies. An LC mode is suggested to reveal the influence of structural parameters (P, D) on the absorption properties. Two measured FOM (19.4, and 29) are obtained based on liquid sensing at room temperature. Since the resonance property of the VO2 layer is temperature reversible, the absorption performance of the metasurface is repeatable in the heating and cooling process. In the final experiments, the absorption peak is controlled in the heating and cooling process. Such a metasurface can be applied in liquid sensing and temperature sensing.","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124570950","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}
Predictive models for grain growth of nanocrystalline binary alloys are designed to select appropriate solutes and assess thermodynamic stabilization in nanoscale alloy systems. The available models incorporate concepts of free energy, solute segregation, size-misfit elastic strain energy, grain boundary energy and phase field framework. Besides the above factors, the present work proposes a novel cellular automaton model by considering normal grain boundary (GB) diffusion, triple junction GB kinetics and grain misorientation. The experimental data for two kinds of binary alloy system were used to validate the reasonability of the proposed model. For nanocrystalline Fe-4% Zr alloy with large atomic size mismatch and negative mixing enthalpy, compared with the available models, the proposed model shows a better fit to the experimental results for grain size as a function of annealing temperatures. For another binary alloy system with small atomic size mismatch and positive mixing enthalpy, the proposed model also captures well the measurements for grain size of nanocrystalline W-20% Ti alloy. The comparisons reveal that the proposed model has a wide application in addressing the thermal stabilization of nanocrystalline grain size.
{"title":"Simulating Thermodynamic Stabilization in Nanocrystalline Binary Alloys Using a Novel Cellular Automaton Model","authors":"S. Cai, S. Kadambi, S. Patala, C. Koch","doi":"10.2139/ssrn.3655867","DOIUrl":"https://doi.org/10.2139/ssrn.3655867","url":null,"abstract":"Predictive models for grain growth of nanocrystalline binary alloys are designed to select appropriate solutes and assess thermodynamic stabilization in nanoscale alloy systems. The available models incorporate concepts of free energy, solute segregation, size-misfit elastic strain energy, grain boundary energy and phase field framework. Besides the above factors, the present work proposes a novel cellular automaton model by considering normal grain boundary (GB) diffusion, triple junction GB kinetics and grain misorientation. The experimental data for two kinds of binary alloy system were used to validate the reasonability of the proposed model. For nanocrystalline Fe-4% Zr alloy with large atomic size mismatch and negative mixing enthalpy, compared with the available models, the proposed model shows a better fit to the experimental results for grain size as a function of annealing temperatures. For another binary alloy system with small atomic size mismatch and positive mixing enthalpy, the proposed model also captures well the measurements for grain size of nanocrystalline W-20% Ti alloy. The comparisons reveal that the proposed model has a wide application in addressing the thermal stabilization of nanocrystalline grain size.","PeriodicalId":256429,"journal":{"name":"EngRN: Thermal Engineering (Topic)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134189768","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}
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