Applied Thermal Engineering最新文献_第4页

Numerical assessment on a hybrid axial throughflow cooling scheme applied to the thermal management of bump-type gas foil bearings 应用于凸点式气膜轴承热管理的混合轴向通流冷却方案的数值评估

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-25 DOI: 10.1016/j.applthermaleng.2024.125044

Qi-hong Gao , Wen-jing Sun , Jing-zhou Zhang , Jian-zhong Li , Jing-yang Zhang

{"title":"Numerical assessment on a hybrid axial throughflow cooling scheme applied to the thermal management of bump-type gas foil bearings","authors":"Qi-hong Gao , Wen-jing Sun , Jing-zhou Zhang , Jian-zhong Li , Jing-yang Zhang","doi":"10.1016/j.applthermaleng.2024.125044","DOIUrl":"10.1016/j.applthermaleng.2024.125044","url":null,"abstract":"<div><div>Axial throughflow cooling is a practical thermal management solution for gas foil bearings (GFBs) with ultrahigh rotational speeds and small bearing clearances. The present study conducted a numerical investigation to assess a hybrid axial-throughflow cooling design (both inner cooling flow passing through the hollow shaft and outer cooling flow passing through the rotor–stator gap) for a specific radial bump-type gas foil bearing using the fluid–solid coupled modelling methodology. First, the individual effects of each cooling flow (i.e., the outer cooling mode only and the inner cooling mode only) on the GFB thermal behaviours are directly compared under a fixed rotational speed of <em>ω</em> = 1 × 10<sup>5</sup> rpm with a preset eccentricity ratio of <em>ε</em> = 0.9. The outer cooling mode exhibited superior cooling efficiency compared with the inner cooling mode with the same cooling air usage, albeit at the cost of a significantly greater flow pressure drop. Second, the conjugate roles of the hybrid cooling flows on the GFB thermal behaviours are related to the total cooling air mass flow rate of <em>m</em><sub>total</sub> = 10 kg/h. Nine flow distribution relationships were comparatively studied between the two cooling flows under the same preset static bearing load of <em>F</em> = 31 N, wherein the percentage of the outer cooling flow (<em>m</em><sub>outer</sub><em>/m</em><sub>total</sub>) varied from 10 % to 90 %. The heat removal pathway of the outer cooling flow was found to be dominant. The outer cooling flow exhibited a heat removal proportion close to 60 % when its distribution percentage was 30 %. The results of a comprehensive performance evaluation that considered the peak temperature reduction and cooling air pressure drop suggest a favourable distribution percentage of the outer cooling flow in the range of 30–40 %.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125044"},"PeriodicalIF":6.1,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142697558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Harnessing acoustic energy with liquid metal triboelectric nanogenerators: A promising approach for moving-parts-free power generation

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-24 DOI: 10.1016/j.applthermaleng.2024.125048

Fawad Ahmed , Junxiang Wang , Rui Yang , Guoyao Yu , Shunmin Zhu , Wei Tang , Ercang Luo

{"title":"Harnessing acoustic energy with liquid metal triboelectric nanogenerators: A promising approach for moving-parts-free power generation","authors":"Fawad Ahmed , Junxiang Wang , Rui Yang , Guoyao Yu , Shunmin Zhu , Wei Tang , Ercang Luo","doi":"10.1016/j.applthermaleng.2024.125048","DOIUrl":"10.1016/j.applthermaleng.2024.125048","url":null,"abstract":"<div><div>Heat-driven acoustic engines (HDAEs) offer a promising approach to energy generation without solid moving parts. However, integrating linear alternators for acoustic-to-electric conversion introduces moving components, diminishing this advantage. To tackle this issue, we investigate using an acoustically-driven liquid–metal triboelectric generator (LM-TEG) within HDAEs for acoustic-to-electric conversion. Experiments were conducted in three settings: mechanically-driven LM-TEGs under atmospheric and pressurized gas conditions, and acoustically-driven LM-TEGs. Results from mechanically-driven LM-TEG tests show that using FEP material, increasing LM-TEG contact area, stacking TEGs in parallel, and using pressurized gas enhance performance. Acoustically-driven LM-TEG experiments demonstrate significant improvements with pressurized nitrogen, achieving a short-circuit current approximately 4.5 times higher than with helium at equivalent pressures. Notably, charge and power densities reached 388 μC/m<sup>2</sup> and 1.7 W/m<sup>2</sup>, respectively, surpassing typical values from conventional TEGs. Importantly, these results were obtained with a complete, fully integrated acoustically driven LM-TEG system. This study represents the first investigation in the literature of acoustically driven LM-TEGs, offering a distinct power generation system with no solid moving parts. The findings validate the feasibility of integrating LM-TEGs with HDAEs and suggest their potential for large-scale power generation, moving beyond the small-scale applications that have dominated prior TEG research.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125048"},"PeriodicalIF":6.1,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of an off-grid photovoltaic heat pump collection system with heat collecting as a core 以集热为核心的离网光伏热泵收集系统的实验研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-24 DOI: 10.1016/j.applthermaleng.2024.125004

Xiaodong Dong, Yue Liu, Zewei Pu, Lusang Zhang

{"title":"Experimental investigation of an off-grid photovoltaic heat pump collection system with heat collecting as a core","authors":"Xiaodong Dong, Yue Liu, Zewei Pu, Lusang Zhang","doi":"10.1016/j.applthermaleng.2024.125004","DOIUrl":"10.1016/j.applthermaleng.2024.125004","url":null,"abstract":"<div><div>In this study, an off-grid solar photovoltaic heat pump collection system with heat collection as a core is proposed and experimentally verified. The proposed system consists of coupled photovoltaic and heat pump (HP) systems. In the proposed design, intelligent control strategies are used to ensure that during the day, under high temperature and low humidity conditions, solar energy can be converted into thermal energy. The electricity generated by solar photovoltaic (PV) modules is used to drive an HP for heat collection with a high efficiency. By using an energy storage battery, the proposed system can temporarily store abundant solar energy in the form of electrical energy, thus supplementing the energy required by the HP when solar radiation is insufficient, which improves the PV conversion efficiency. Furthermore, an energy output ratio is introduced to characterize the off-grid photovoltaic heat pump collection system’s operational status. In practical applications, the PV module number has a significant effect on the operating time of HP systems, directly affecting the system’s comprehensive heat collection efficiency (CHCE). A test-bed set up in Lasa, Xizang, China, is used in this study, and a series of all-day experiments are performed to analyze the operational characteristics of the proposed system. This study also discusses the influence of the PV module number and the HP start-up time on the system’s CHCE value. Moreover, an analysis is conducted to determine the relationship between the PV module number and the HP start-up time. The experimental results show that the proposed system has high CHCE and good operational stability when transforming solar energy into heat. The maximum instantaneous CHCE of the proposed system can reach 93 %, and the daily CHCE can reach 72 %. This verifies that the proposed system has research and practical significance, as well as significant application potential.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125004"},"PeriodicalIF":6.1,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Battery energy storage systems for ancillary services in renewable energy communities 用于可再生能源社区辅助服务的电池储能系统

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-24 DOI: 10.1016/j.applthermaleng.2024.124988

Tommaso Ferrucci , Davide Fioriti , Davide Poli , Stefano Barberis , Francesco Roncallo , Valeria Gambino

{"title":"Battery energy storage systems for ancillary services in renewable energy communities","authors":"Tommaso Ferrucci , Davide Fioriti , Davide Poli , Stefano Barberis , Francesco Roncallo , Valeria Gambino","doi":"10.1016/j.applthermaleng.2024.124988","DOIUrl":"10.1016/j.applthermaleng.2024.124988","url":null,"abstract":"<div><div>Renewable Energy Communities can become relevant flexibility actors thanks to their capability of gathering under the same ecosystem, different energy assets, such as generation, and storage, and deferrable and controllable devices such as heavy appliances and computing assets. Particularly thanks to the integration of different energy storages RECs can therefore become a relevant grid operator. This document presents a review of storage and flexibility services alongside a quantitative methodology to analyze its benefits, using the Julia-based EnergyCommunity.jl package. The renewable energy community in Savona in collaboration with the University of Genova campus has been simulated to assert the battery energy storage systems potential. The study compares the outcomes of cooperative approaches with and without flexibility services to a scenario where users do not cooperate. The study concludes that storage systems can create new flexible instruments for the grid and a tool for citizens, which could make batteries financially viable. The study suggests that greater transparency and information on hourly energy sales and purchase prices would facilitate awareness among community members and stimulate discussion of technologies such as batteries to cover the most expensive nighttime periods for users.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 124988"},"PeriodicalIF":6.1,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated multi-objective optimization of a horizontal evaporator structure in domestic refrigerators: Comparison between the semi-empirical model and GMDH neural networks for enhanced pareto frontiers 家用冰箱水平蒸发器结构的综合多目标优化：半经验模型与 GMDH 神经网络在增强帕累托前沿方面的比较

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-24 DOI: 10.1016/j.applthermaleng.2024.124949

Chenxi Ni , Haihong Huang , Peipei Cui , Qingdi Ke , Shiyao Tan , Kim Tiow Ooi , Zhifeng Liu

{"title":"Integrated multi-objective optimization of a horizontal evaporator structure in domestic refrigerators: Comparison between the semi-empirical model and GMDH neural networks for enhanced pareto frontiers","authors":"Chenxi Ni , Haihong Huang , Peipei Cui , Qingdi Ke , Shiyao Tan , Kim Tiow Ooi , Zhifeng Liu","doi":"10.1016/j.applthermaleng.2024.124949","DOIUrl":"10.1016/j.applthermaleng.2024.124949","url":null,"abstract":"<div><div>In this paper, an Integrated Multi-Objective Optimization for optimising the horizontal evaporator structure of a domestic refrigerator is proposed by comparing the semi-empirical formulation model with the Group Method of Data Handling (GMDH) neural network model. Using STAR-CCM+ for 3D simulation and Amesim for a 1D system model, it examines the pressure drop, flow rate, and heat transfer of a horizontally finned tubes evaporator with trapezoidal fins. It compares the adaptability of a semi-empirical formula model and the GMDH model. The semi-empirical formulas uses row distance and fin pitch to model air-side flow rate and pressure drop, while the GMDH models uses six design parameters (tube distance, row distance, tube outer diameter, fin pitch, number of units, and fan speed) for its calculations. The semi-empirical models and GMDH models employ multi-objective optimization algorithms with friction factor (<em>f</em>) and heat transfer coefficient (<em>j</em>) as objectives. The design Pareto fronts of both methods do not overlap, creating a comprehensive Pareto front. The unification of these Pareto fronts provides a comprehensive design space to analyze. The evaluation using LINMAP, TOPSIS, and Shannon’s entropy methods showed that LINMAP and TOPSIS provided superior solutions for the more linear semi-empirical model. In contrast, the Shannon entropy method offered a more robust solution for the highly nonlinear and complex GMDH model, making it more suitable for conditions with high uncertainty. The optimal design point in the GMDH model was selected using the Shannon entropy method, with <em>f</em> and <em>j</em> values of 0.174 and 19.430, respectively.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 124949"},"PeriodicalIF":6.1,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A surrogate model method for aircraft cabin thermal analysis based on equivalent heat sink

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-24 DOI: 10.1016/j.applthermaleng.2024.125061

Chuang Sun , Yinan Wang , Qian Luo , Xuejun Yang , Xue Chen , Xinlin Xia

{"title":"A surrogate model method for aircraft cabin thermal analysis based on equivalent heat sink","authors":"Chuang Sun , Yinan Wang , Qian Luo , Xuejun Yang , Xue Chen , Xinlin Xia","doi":"10.1016/j.applthermaleng.2024.125061","DOIUrl":"10.1016/j.applthermaleng.2024.125061","url":null,"abstract":"<div><div>Thermal analysis of an aircraft cabin is challenging to simulate accurately because of the complexity of the involved heat transfer processes. The natural convection heat transfer coefficient, a critical parameter for thermal analysis, is difficult to determine reliably through direct numerical simulation or experimental measurement, largely because of the presence of numerous instruments and unknown operational conditions. To overcome these challenges, a surrogate model with physical significance was proposed, in which the instruments are represented as equivalent heat sinks. The parameters required for the surrogate model were determined by analyzing the heat transfer processes within the cabin. Using a set of real temperature field data, genetic algorithms were employed to identify the relevant surrogate model parameters, including the natural convection heat transfer coefficient, heat transfer surface area, volume, and heat generation power.</div><div>To validate the proposed surrogate model, the temperature field predicted by the surrogate model was compared with experimental results from the real aircraft cabin. It was found that the surrogate model can accurately predict the temperature data of the real aircraft cabin, and the more data utilized in the parameter identification process, the more accurate the temperature prediction. Additionally, as long as the cabin structure remains unchanged, the surrogate model is applicable across different scenarios, significantly improving the efficiency of thermal analysis. Finally, temperature predictions under various boundary conditions were performed and compared with directly simulated temperature fields. The maximum error of the convective heat transfer coefficient obtained through parameter identification was approximately 6 %, while the maximum error of the temperature field predicted by the surrogate model was 2.2 K.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125061"},"PeriodicalIF":6.1,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation on charging and discharging performance of finned shell and tube device containing pentaerythritol for low and medium temperature thermal energy storage 含季戊四醇的翅片壳管装置中低温热能储存充放电性能实验研究

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-23 DOI: 10.1016/j.applthermaleng.2024.125029

Xuanxuan Wang , Yuting Wu , Chuan Li , Yuanwei Lu , Cancan Zhang , Qi Li , Zhigang Liu , Shi Liu

{"title":"Experimental investigation on charging and discharging performance of finned shell and tube device containing pentaerythritol for low and medium temperature thermal energy storage","authors":"Xuanxuan Wang , Yuting Wu , Chuan Li , Yuanwei Lu , Cancan Zhang , Qi Li , Zhigang Liu , Shi Liu","doi":"10.1016/j.applthermaleng.2024.125029","DOIUrl":"10.1016/j.applthermaleng.2024.125029","url":null,"abstract":"<div><div>This work concerns the investigation of the charging and discharging performance of a finned shell and tube device that utilized for low and medium temperature thermal energy storage application. An experimental rig is built for evaluation in which a so-called solid–solid phase change material of pentaerythritol is used as energy storage substance and air is employed as heat transfer fluid. The PE has tested to have a melting temperature range of 185-205℃ and a latent heat of 290 kJ/kg. The study first examines the effect of fin number on the device thermal performance by considering configurations with 4, 6, 8, and 10 fins. Then the impact of fin height is evaluated where four different fin heights of 9 mm, 14 mm, 19 mm and 24 mm is investigated, and finally the influence of heat transfer fluid working condition is explored. The results indicate that the PE could be ideal PCM utilized in shell-tube typed thermal energy storage device. The enhancement of fin number and fin heigh can largely improve both the charging and discharging performance of the device. For a given air inlet pressure of 0.1 MPa, the device having fin number of 10 and fin height of 19 mm could be identified as the optimal configuration for heat transfer, and at such working conditions, the device achieves a charging efficiency of 91.49 % and a discharging efficiency of 86.4 %.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125029"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142697557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photothermal superhydrophobic coupled functional surface with active anti/de-icing performance 具有主动防/除冰性能的光热超疏水耦合功能表面

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-23 DOI: 10.1016/j.applthermaleng.2024.125031

Xiuzhang Qin , Qian Cong , Jin Xu , Tingkun Chen , Jingfu Jin , Chaozong Liu , Mingqing Wang

{"title":"Photothermal superhydrophobic coupled functional surface with active anti/de-icing performance","authors":"Xiuzhang Qin , Qian Cong , Jin Xu , Tingkun Chen , Jingfu Jin , Chaozong Liu , Mingqing Wang","doi":"10.1016/j.applthermaleng.2024.125031","DOIUrl":"10.1016/j.applthermaleng.2024.125031","url":null,"abstract":"<div><div>Ice adhesion has caused serious impacts on the engineering field, such as the safety and efficiency of equipment operation. Photothermal superhydrophobic surfaces are a potentially effective anti/de-icing method by combining solar heat with low-energy hydrophobic surfaces to prevent icing formation or accelerate ice melting. During the present study, the photothermal superhydrophobic was prepared on the aluminum alloy surface, as well as polypropylene coating and photothermal coating. The light absorption, wettability, and anti/de-icing properties of different surfaces were systematically investigated. The photothermal superhydrophobic coating has good light absorption efficiency and can increase the surface temperature by approximately 35 °C within the same illumination time. The contact angle of the photothermal superhydrophobic coating is 162°, which not only demonstrates good anti/de-icing performance but also can delay the freezing time of attached water independent of the refrigeration method. After 50 mechanical stability tests and chemical stability tests, the photothermal superhydrophobic coating still maintains good durability. The present study demonstrates that photothermal superhydrophobic surface is a promising anti/de-icing coating with stable performance for engineering applications.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125031"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142697556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new parameter unifying criterion for rectangular surface structure influences on vaporization nucleation: A molecular dynamics study

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-23 DOI: 10.1016/j.applthermaleng.2024.125053

Xiaojia Li , Wei Deng , Song Ni , Guopeng Yu , Jiyun Zhao , Pingjian Ming

{"title":"A new parameter unifying criterion for rectangular surface structure influences on vaporization nucleation: A molecular dynamics study","authors":"Xiaojia Li , Wei Deng , Song Ni , Guopeng Yu , Jiyun Zhao , Pingjian Ming","doi":"10.1016/j.applthermaleng.2024.125053","DOIUrl":"10.1016/j.applthermaleng.2024.125053","url":null,"abstract":"<div><div>This study investigates the nucleation behavior on nanostructured surfaces and its impact on heat transfer efficiency. The significance of this research lies in the fact that accurate characterization of surface effects is crucial for optimizing heat transfer systems, which have profound implications for various industrial applications. Using molecular dynamics methods, we systematically analyze the influence of rectangular surface structures with varying heights, widths, and densities on nucleation behavior. Our findings reveal that traditional surface roughness metrics fail to capture critical surface details, limiting their ability to accurately describe the effects of different surfaces on nucleation. Furthermore, we observe that surface structures significantly influence nucleation by altering local liquid film thicknesses. To address these limitations, we propose a novel parameter that combines corrected effective liquid film thickness with surface roughness to provide a more comprehensive characterization of the nucleation process. Through computational modeling, we validate the effectiveness of this parameter in predicting heat flux density, heat transfer coefficient, and surface thermal resistance across different rectangular surface structures. The results of this study clarify the mechanisms through which surface structures affect nucleation, offering a more precise tool for characterizing these effects. This enhanced understanding not only advances the theoretical framework of nucleation science but also has practical implications for the design of more efficient heat transfer systems in various industrial settings. The novelty of this work lies in the introduction of a new parameter that surpasses previous efforts in the literature by providing a more accurate quantitative prediction of the impact of surface structures on nucleation and heat transfer efficiency.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125053"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study on temperature and thermal stress behaviors in silicon carbide heating elements within high-temperature annealing furnaces

IF 6.1 2区工程技术

Applied Thermal Engineering Pub Date : 2024-11-23 DOI: 10.1016/j.applthermaleng.2024.125047

Takhyun Chun , Sooin Kim , Jaewon Chung , Hookyung Lee

{"title":"Numerical study on temperature and thermal stress behaviors in silicon carbide heating elements within high-temperature annealing furnaces","authors":"Takhyun Chun , Sooin Kim , Jaewon Chung , Hookyung Lee","doi":"10.1016/j.applthermaleng.2024.125047","DOIUrl":"10.1016/j.applthermaleng.2024.125047","url":null,"abstract":"<div><div>In response to global sustainability goals, the transition from fossil fuel-based to electric silicon carbide (SiC) heating elements in continuous annealing furnaces is critical for reducing emissions, enhancing safety, and improving operational environments in the steel industry. This study investigates the cross-sectional temperature profiles and the resultant thermal stress of hollow cylindrical SiC heating elements under varied design conditions. To independently analyze the complex effects of multiple factors, both theoretical and numerical analyses were conducted using simplified boundary conditions in two dimensions, which closely simulate the actual temperature profiles observed in heaters within a continuous annealing line. The results indicate that the radial temperature gradient and resulting thermal stress in these elements are directly proportional to the surface heating load, with the maximum axial tensile stress occurring at the outer surface of the heater. Scenarios involving closely spaced multiple heaters or the introduction of cold steel strips lead to increased axial thermal stress due to additional circumferential temperature gradients. Conversely, the application of shield tubes, despite increasing the heater’s temperature, reduces thermal stress by homogenizing radiation within the tube. Consequently, optimizing heater configuration and operational conditions is essential in furnace design to effectively manage heaters’ temperature and thermal stress, thereby ensuring both efficiency and service longevity of the heating elements.</div></div>","PeriodicalId":8201,"journal":{"name":"Applied Thermal Engineering","volume":"260 ","pages":"Article 125047"},"PeriodicalIF":6.1,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0