This research undertakes a numerical investigation of an axisymmetric double-jet semi-confined annular flow produced by a burner. The endeavor aims to thoroughly decipher the behavior of these turbulent flows within a double annular jet, with a focus on characterizing the mixing and recirculation regions. Analyses of the annular jet were conducted for three distinct Reynolds numbers (6683, 8874, and 11065). Numerical simulations were performed using a computational fluid dynamics (CFD) calculation code, employing two turbulence models-k-epsilon and SST k-ω. The governing differential equations, discretized for the flow, were solved via the finite volume method, utilizing the semi-implicit method algorithm for pressure-linked equations. Findings revealed the existence of three recirculation zones separated by the annular jets. The first, a minute zone, is situated between the two annular jets. The second, a medium-sized zone, resides just behind the nozzle near the injection axis, below the primary jet. The third, a large zone, is positioned near the upper wall of the combustion chamber. It was observed that the size of the initial small recirculation zone exhibited negligible variation with changes in the Reynolds number. However, the second medium-sized zone experienced notable alterations with the Reynolds number. The third large zone generated an extensive toroidal vortex at higher Reynolds numbers. These recirculation zones offer potential for control to optimize fuel-air mixing, aiming to achieve near-perfect combustion while minimizing pollutant emissions. The numerical simulation results generally exhibited strong agreement with experimental findings.
{"title":"Numerical Prediction of a Turbulent Flow with Double Annular Jets for Different Reynolds Numbers","authors":"Feraoun Ali, Merouane Habib, Sahnoun Rachid","doi":"10.18280/ijht.410521","DOIUrl":"https://doi.org/10.18280/ijht.410521","url":null,"abstract":"This research undertakes a numerical investigation of an axisymmetric double-jet semi-confined annular flow produced by a burner. The endeavor aims to thoroughly decipher the behavior of these turbulent flows within a double annular jet, with a focus on characterizing the mixing and recirculation regions. Analyses of the annular jet were conducted for three distinct Reynolds numbers (6683, 8874, and 11065). Numerical simulations were performed using a computational fluid dynamics (CFD) calculation code, employing two turbulence models-k-epsilon and SST k-ω. The governing differential equations, discretized for the flow, were solved via the finite volume method, utilizing the semi-implicit method algorithm for pressure-linked equations. Findings revealed the existence of three recirculation zones separated by the annular jets. The first, a minute zone, is situated between the two annular jets. The second, a medium-sized zone, resides just behind the nozzle near the injection axis, below the primary jet. The third, a large zone, is positioned near the upper wall of the combustion chamber. It was observed that the size of the initial small recirculation zone exhibited negligible variation with changes in the Reynolds number. However, the second medium-sized zone experienced notable alterations with the Reynolds number. The third large zone generated an extensive toroidal vortex at higher Reynolds numbers. These recirculation zones offer potential for control to optimize fuel-air mixing, aiming to achieve near-perfect combustion while minimizing pollutant emissions. The numerical simulation results generally exhibited strong agreement with experimental findings.","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"15 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931687","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}
{"title":"Examining the influence of thermal stress on the seismic resilience of prefabricated box culverts","authors":"Hua Wang, Xuetao Zhao, Yixiang Deng","doi":"10.18280/ijht.410516","DOIUrl":"https://doi.org/10.18280/ijht.410516","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"151 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931929","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}
{"title":"Thermodynamic Modelling for Heat Analysis and Prediction in Precision Transmission Systems: A Focus on Gear Operation","authors":"Suzhen Wu, Min Han","doi":"10.18280/ijht.410522","DOIUrl":"https://doi.org/10.18280/ijht.410522","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931281","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 the realm of global manufacturing, the proliferation of Laser Powder Bed Fusion (LPBF) technologies has necessitated an in-depth understanding of the dynamics between thermal flow and stress fields during its operative procedures. Interactions between these fields have been observed to induce thermal distortions in components, potentially jeopardizing the structural integrity and operational efficiency of the end products. Insights have been garnered through conventional finite element methods and empirical models, yet these methodologies encounter evident constraints when deciphering highly nonlinear, multi-scale systems. This research delves into the employment of deep learning techniques for the cooperative modelling of the aforementioned fields, suggesting an innovative approach to thermal distortion predictions. The outcomes derived from this inquiry are foreseen to unveil novel optimization strategies for laser melting manufacturing methodologies, propelling the evolution of this specialized field.
{"title":"Deep Learning-Based Cooperative Modelling of Thermal Flow and Stress Fields in Laser Powder Bed Fusion","authors":"Shuang Huang, Dan Huang","doi":"10.18280/ijht.410512","DOIUrl":"https://doi.org/10.18280/ijht.410512","url":null,"abstract":"In the realm of global manufacturing, the proliferation of Laser Powder Bed Fusion (LPBF) technologies has necessitated an in-depth understanding of the dynamics between thermal flow and stress fields during its operative procedures. Interactions between these fields have been observed to induce thermal distortions in components, potentially jeopardizing the structural integrity and operational efficiency of the end products. Insights have been garnered through conventional finite element methods and empirical models, yet these methodologies encounter evident constraints when deciphering highly nonlinear, multi-scale systems. This research delves into the employment of deep learning techniques for the cooperative modelling of the aforementioned fields, suggesting an innovative approach to thermal distortion predictions. The outcomes derived from this inquiry are foreseen to unveil novel optimization strategies for laser melting manufacturing methodologies, propelling the evolution of this specialized field.","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"7 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931490","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}
{"title":"Influence of Microwave Energy and Agitation on the Physicochemical Properties of Natural Mineral Water","authors":"Tatyana Viktorovna Shevchenko, Yulia Vladislavovna Ustinova, Anatoliy Mikhailovich Popov, Evgenia Olegovna Ermolaeva, Gleb Borisovich Uzunov, Natalia Leonidovna Gryaznova, Ekaterina Dmitrievna Khakimova","doi":"10.18280/ijht.410514","DOIUrl":"https://doi.org/10.18280/ijht.410514","url":null,"abstract":"","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"23 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931628","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}
Ahmed Sabah Thaker, Fawziea M. Hussien, Johain J. Faraj
An innovative indirect solar dryer, designed for banana dehydration, was developed and assessed, utilizing the Ansys software for simulation. The system comprises a vacuum tube water heater and a drying chamber, the latter of which incorporates phase-change materials (PCMs), thus enhancing the drying performance. A fan positioned within the chamber synergizes with the PCMs, effectively abbreviating the drying time. Computational simulations were executed to refine the system design and operational parameters. A sorption isotherm was constructed to delineate the optimal moisture content and water activity, fundamental parameters for efficient drying. The integrated solar collector facilitates the transformation of solar energy into heat, while the drying chamber, accommodating two baskets of produce, optimizes the heat distribution. Our system demon strated the capacity to generate high drying temperatures, especially efficient for items exhibiting lower moisture content than bananas. The system achieved a predicted maximum efficiency of 67.40%, operating optimally within a temperature range of 60-65℃. Experimental results were congruent with computational simulations, reinforcing the efficacy o f the drying chamber. This study introduces a novel, sustainable method for efficient fruit dehydration, spotlighting its potential applicability beyond bananas to other produce.
{"title":"Numerical Simulation of an Indirect Solar Dryer Equipped with Thermal Conduction Enhancer Augmented Phase Change Materials (PCMs) for Banana Drying","authors":"Ahmed Sabah Thaker, Fawziea M. Hussien, Johain J. Faraj","doi":"10.18280/ijht.410506","DOIUrl":"https://doi.org/10.18280/ijht.410506","url":null,"abstract":"An innovative indirect solar dryer, designed for banana dehydration, was developed and assessed, utilizing the Ansys software for simulation. The system comprises a vacuum tube water heater and a drying chamber, the latter of which incorporates phase-change materials (PCMs), thus enhancing the drying performance. A fan positioned within the chamber synergizes with the PCMs, effectively abbreviating the drying time. Computational simulations were executed to refine the system design and operational parameters. A sorption isotherm was constructed to delineate the optimal moisture content and water activity, fundamental parameters for efficient drying. The integrated solar collector facilitates the transformation of solar energy into heat, while the drying chamber, accommodating two baskets of produce, optimizes the heat distribution. Our system demon strated the capacity to generate high drying temperatures, especially efficient for items exhibiting lower moisture content than bananas. The system achieved a predicted maximum efficiency of 67.40%, operating optimally within a temperature range of 60-65℃. Experimental results were congruent with computational simulations, reinforcing the efficacy o f the drying chamber. This study introduces a novel, sustainable method for efficient fruit dehydration, spotlighting its potential applicability beyond bananas to other produce.","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"62 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931435","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}
Kadhim K. Idan Al-Chlaihawi, Bahjat Hassan Alyas, Abdullah A. Badr
ABSTRACT
{"title":"CFD Based Numerical Performance Assessment of a Solar Air Heater Duct Roughened by Transverse - Trapezoidal Sectioned Ribs","authors":"Kadhim K. Idan Al-Chlaihawi, Bahjat Hassan Alyas, Abdullah A. Badr","doi":"10.18280/ijht.410517","DOIUrl":"https://doi.org/10.18280/ijht.410517","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"4 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931206","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}
{"title":"Enhanced Heat Transfer Mechanisms in a Horizontal Annular Heat Exchanger Utilizing a Central Tubular Heater","authors":"Mustaza Ma’a, Indro Pranoto, Samsul Kamal","doi":"10.18280/ijht.410523","DOIUrl":"https://doi.org/10.18280/ijht.410523","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931270","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}
With the evolution of industrial technology, the role of valves in multifarious systems has been accentuated. Traditional methodologies for valve design and fabrication predominantly depended on tangible laboratory tests to ascertain their hydrodynamic and thermodynamic properties. Such methodologies, although resource-intensive, often fall short in accurately predicting valve performance under genuine operational environments due to inherent experimental limitations. Presented in this study is a simulation system for valve design that seamlessly integrates virtual reality with fluid dynamics. This system's primary objective is the emulation and comprehensive assessment of valves' hydrodynamic and thermodynamic responses under a variety of operational conditions within a virtual environment. Such an approach considerably diminishes both the temporal and monetary costs of testing and provides design engineers with an intuitive, precise feedback mechanism. This, in turn, fosters enhanced design strategies ensuring the efficiency and safety of valve operations. Moreover, the amalgamation of thermodynamic principles with fluid dynamics models has been elucidated, proffering a more solid theoretical framework for the efficient design and pragmatic application of valves.
{"title":"Virtual Reality-Enhanced Fluid Dynamics for Thermodynamic and Hydrodynamic Evaluation in Valve Design","authors":"Guangke Qi, Zhiliang Xia","doi":"10.18280/ijht.410531","DOIUrl":"https://doi.org/10.18280/ijht.410531","url":null,"abstract":"With the evolution of industrial technology, the role of valves in multifarious systems has been accentuated. Traditional methodologies for valve design and fabrication predominantly depended on tangible laboratory tests to ascertain their hydrodynamic and thermodynamic properties. Such methodologies, although resource-intensive, often fall short in accurately predicting valve performance under genuine operational environments due to inherent experimental limitations. Presented in this study is a simulation system for valve design that seamlessly integrates virtual reality with fluid dynamics. This system's primary objective is the emulation and comprehensive assessment of valves' hydrodynamic and thermodynamic responses under a variety of operational conditions within a virtual environment. Such an approach considerably diminishes both the temporal and monetary costs of testing and provides design engineers with an intuitive, precise feedback mechanism. This, in turn, fosters enhanced design strategies ensuring the efficiency and safety of valve operations. Moreover, the amalgamation of thermodynamic principles with fluid dynamics models has been elucidated, proffering a more solid theoretical framework for the efficient design and pragmatic application of valves.","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931416","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}
{"title":"Optimisation of Numerical Control Tool Cutting Parameters Based on Thermodynamic Response and Machine Learning Algorithms","authors":"Nanyang Zhang","doi":"10.18280/ijht.410430","DOIUrl":"https://doi.org/10.18280/ijht.410430","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136034863","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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