International Communications in Heat and Mass Transfer最新文献

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Measurement of metal-sorbent heat transfer coefficients for the heat release stage of an adsorption heat pump: Pressure jump vs Temperature jump 吸附式热泵放热阶段金属吸附剂传热系数的测量:压力跃变vs温度跃变
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-02 DOI: 10.1016/j.icheatmasstransfer.2025.109748
A.D. Grekova, A.V. Cherpakova, M.M. Tokarev
{"title":"Measurement of metal-sorbent heat transfer coefficients for the heat release stage of an adsorption heat pump: Pressure jump vs Temperature jump","authors":"A.D. Grekova,&nbsp;A.V. Cherpakova,&nbsp;M.M. Tokarev","doi":"10.1016/j.icheatmasstransfer.2025.109748","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109748","url":null,"abstract":"<div><div>Adsorption heat pumping is eco-friendly application that enables energy saving. Process efficiency can be increased by heat transfer enhancement with adsorber-heat-exchanger optimization. Two different methods for measuring metal-sorbent heat transfer coefficients α are discussed: Large Temperature/Pressure Jump. Novel composite LiCl/highly-porous silica was used as sorbent. These methods simulate adsorption heat storage cycle and give possibility to measure α for grains with size D = 0.8–0.9, 0.4–0.5 and 0.2–0.25 mm. The coefficients measured by different methods are close: 160–170 W/m<sup>2</sup>K for the largest, 250–270 W/m<sup>2</sup>K for intermediate and 420–460 W/m<sup>2</sup>K for the smallest grains. The linear function connecting α and 1/D was found.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109748"},"PeriodicalIF":6.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216439","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
Mass transfer between CO2 and heavy hydrocarbon components in shale – Insights from the effect on flow 页岩中CO2和重烃组分之间的传质——对流体流动的影响
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-02 DOI: 10.1016/j.icheatmasstransfer.2025.109750
Zhuoying Dou , Zhengming Yang , Yongning Ma , Xi Zhang , Haibo Li , Chenyu Han
{"title":"Mass transfer between CO2 and heavy hydrocarbon components in shale – Insights from the effect on flow","authors":"Zhuoying Dou ,&nbsp;Zhengming Yang ,&nbsp;Yongning Ma ,&nbsp;Xi Zhang ,&nbsp;Haibo Li ,&nbsp;Chenyu Han","doi":"10.1016/j.icheatmasstransfer.2025.109750","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109750","url":null,"abstract":"<div><div>Physicochemical interactions between CO<sub>2</sub> and crude oil induce the deposition or blockage of heavy components. The integration of nuclear magnetic resonance (NMR) and theoretical calculations was employed to elucidate the pore-scale mass transfer mechanisms of CO<sub>2</sub>-heavy component interactions and quantify their impacts on flow. The results indicate that the interaction between CO<sub>2</sub> and heavy components exhibits a pressure threshold that exceeds the miscible pressure of CO<sub>2</sub> and heavy components. Thermal effect makes the impact of heavy components on flow approximately 1.8–2.5 times lower than low temperatures. When injection pressure is below the miscibility, low temperature and nano-confinement effect cause heavy components in micropores to gasify after CO<sub>2</sub> injection, leading their migration towards macropores for liquefaction and then adsorption or blockage. Conversely, macropores' heavy components migrate towards micropores with thermal effect, resulting in endothermic adsorption. When injection pressure exceeds the miscible pressure, heavy components extracted by CO<sub>2</sub> adsorb and form a boundary layer away from the pore wall. As injection pressure increases to the threshold, CO<sub>2</sub> repeatedly contacts and extracts this fluid phase, eventually migrating out with the gas flow. This process can increase the maximum flow capacity by 70.09 % and pore volume by 8.12 %.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109750"},"PeriodicalIF":6.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216438","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
Thermal behavior of gold nanoparticle-enhanced paraffin phase change materials: Insights from molecular dynamics simulation 金纳米颗粒增强石蜡相变材料的热行为:来自分子动力学模拟的见解
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109715
Yujun Cao , Xin Li , Soheil Salahshour , S. Eftekharmanesh , Ismat H. Ali , Melisa Acosta-Coll
{"title":"Thermal behavior of gold nanoparticle-enhanced paraffin phase change materials: Insights from molecular dynamics simulation","authors":"Yujun Cao ,&nbsp;Xin Li ,&nbsp;Soheil Salahshour ,&nbsp;S. Eftekharmanesh ,&nbsp;Ismat H. Ali ,&nbsp;Melisa Acosta-Coll","doi":"10.1016/j.icheatmasstransfer.2025.109715","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109715","url":null,"abstract":"<div><div>Phase change materials (PCMs) exhibit exceptional performance in thermal energy storage, as they absorb and release Heat during phase changes. However, their application is always limited due to their low thermal conductivity. This study uses molecular dynamics simulation to assess the effects of gold nanoparticles (Au-NPs) on paraffin-based PCMs. The simulation results demonstrate that Au nanoparticles (Au-NPs) greatly enhance the thermal performance of the material. For example, the temperature stabilized at 844 K (from 806 K w/o Au-NPs), the thermal conductivity increased from 1.03 to 1.14 W/m·K, the heat flux improved from 7.56 to 8.03 W/m<sup>2</sup> (to transfer heat faster), increases maximum velocity from 0.075 to 0.082 Å/ps (which suggests a faster molecular motion), and a slight reduction in density from 0.0149 to 0.0146 atom/Å<sup>3</sup> (which is the result of molecular restructuring when integrating Au-NPs). Through these enhancements, the paper demonstrates the importance of Au-NPs in addressing the issue of low thermal conductivity in PCMs. The results add significant understanding for designing and optimizing nanoparticle-enhanced PCMs for renewable energy storage, electronics cooling, and sustainable thermal management systems. This understanding of molecular behavior opens possibilities for improving efficiency and reliability in thermal energy storage technology.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109715"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216551","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
Active contraction-integrated FSI: Numerical modeling of cardiac pumping 主动收缩集成FSI:心脏泵送的数值模拟
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109730
Xinzhe Chen, Jiqing Chen, Fengchong Lan, Xiong Li
{"title":"Active contraction-integrated FSI: Numerical modeling of cardiac pumping","authors":"Xinzhe Chen,&nbsp;Jiqing Chen,&nbsp;Fengchong Lan,&nbsp;Xiong Li","doi":"10.1016/j.icheatmasstransfer.2025.109730","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109730","url":null,"abstract":"<div><div>This study develops a fluid–structure interaction (FSI) model of the cardiovascular system to simulate the heart’s pumping action and hemodynamics. The model integrates an active contraction mechanism to accurately represent cardiac function. To capture the passive mechanical properties of the heart muscle, an anisotropic hyperelastic model is used. The active contraction is described by incorporating force–length and force–velocity relationships, which are calibrated with experimental data, alongside a time-dependent activation function based on cellular action potentials. The Arbitrary Lagrangian–Eulerian (ALE) method governs the FSI between the blood and the deforming ventricle and aorta. An immersed boundary method is employed to manage the FSI boundary and prevent numerical issues like leakage, while physiological pressure conditions are applied at the outlets. The model’s predictions for aortic flow, pressure, and left ventricular contraction were validated against existing experimental data. The results show the model successfully predicts cardiac pumping and contractile behavior. This demonstrates its potential for future applications in simulating heart diseases and studying cardiovascular trauma.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109730"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216554","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
Machine learning-based Bayesian regularization algorithm for thermal analysis of tri-hybrid nanofluid flow over a stretched sheet 基于机器学习的三混合纳米流体在拉伸薄片上流动的贝叶斯正则化算法
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109761
Muhammad Imran , Mohib Hussain , Wantao Jia , Nehad Ali Shah , Bagh Ali
{"title":"Machine learning-based Bayesian regularization algorithm for thermal analysis of tri-hybrid nanofluid flow over a stretched sheet","authors":"Muhammad Imran ,&nbsp;Mohib Hussain ,&nbsp;Wantao Jia ,&nbsp;Nehad Ali Shah ,&nbsp;Bagh Ali","doi":"10.1016/j.icheatmasstransfer.2025.109761","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109761","url":null,"abstract":"<div><div>Tri-hybrid nanofluids, which consist of three different nanoparticles dispersed in a base fluid, have shown excessive potential as a new generation of thermal materials because of their exceptional heat transfer properties. These fluids are particularly useful for next-generation thermal systems, such as microfluidic cooling devices, solar collectors, aerospace heat exchangers, and nuclear reactor cooling systems. In this article, the heat transfer characteristics of a Williamson-type tri-hybrid nanofluid over a bidirectional stretching sheet under the influence of thermal radiation, magnetic field, and porosity are explored. The main objective is to build and test an effective hybrid framework that combines conventional numerical methods with artificial intelligence to reliably forecast the flow and thermal properties of complicated nanofluid systems. The primary objective is to develop and validate a hybrid numerical-machine learning algorithm that integrates MATLAB's BVP4C solver and an Artificial Neural Network with Bayesian Regularization (ANN-BRA) for estimating velocity and temperature distributions under varying physical parameters. The partial differential equations governing (PDEs) are transformed to ordinary differential equations (ODEs) via similarity variables and numerically resolved to train the ANN. This is the first use of ANN-BRA trained on BVP4C-generated data to simulate tri-hybrid nanofluids inside a Williamson fluid framework. The ANN-BRA model obtains exact regression (<em>R</em> = 1) and a mean squared error (MSE) less than 10<sup>−11</sup>, which reflects high precision and generalization. Outcomes indicate that an increased magnetic field (<span><math><mi>M</mi></math></span>) and porosity (<span><math><mi>ϕ</mi></math></span>) decrease the flow velocity, while an elevated volume fraction of nanoparticles (<span><math><msub><mi>ϕ</mi><mi>n</mi></msub></math></span>) strengthens thermal boundary layers. The Eckert number (<span><math><mi>Ec</mi></math></span>), Biot number (<span><math><mi>Bi</mi></math></span>), and thermal radiation (<span><math><mi>Rd</mi></math></span>) are indicated to have strong influences on heat transfer rates. This work presents both numerical and physical understanding of tri-hybrid nanofluid behavior and a useful modeling methodology to optimize practical thermal engineering applications.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109761"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216566","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
Machine learning-assisted modeling of mixed convection in tangent hyperbolic nanofluid with non-Fourier and non-Fickian transport 非傅立叶和非菲克输运切线双曲纳米流体混合对流的机器学习辅助建模
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109709
M. Nasir , M. Waqas , Nurnadiah Zamri , Arij Alfaidi , Sarra Ayouni , Amjad A. Alsuwaylimi
{"title":"Machine learning-assisted modeling of mixed convection in tangent hyperbolic nanofluid with non-Fourier and non-Fickian transport","authors":"M. Nasir ,&nbsp;M. Waqas ,&nbsp;Nurnadiah Zamri ,&nbsp;Arij Alfaidi ,&nbsp;Sarra Ayouni ,&nbsp;Amjad A. Alsuwaylimi","doi":"10.1016/j.icheatmasstransfer.2025.109709","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109709","url":null,"abstract":"<div><div>This investigation elaborates quadratic dual convection features in stretching sheet induced hyperbolic-tangent nanoliquid deploying modern fluxes based on generalized mass and heat transmission models. The modeled nonlinear transport expression accounts temperature-dependent conductivity, thermal generation and concentration-dependent diffusivity. Buongiorno nanomaterial diffusion model is modified in view of modern thermosolutal fluxes. The governing mathematical expressions derived subject to traditional boundary-layer concept are transfigured to ordinary differential framework by utilizing apposite similarity constraints. The numerical bvp4c approach is then utilized to solve the nonlinear equations, enabling the simulation to be precise. The intelligent ANNs-LMM model is trained and validated by utilizing reference dataset attained from the numerical Bvp4c approach with the help of MATLAB software, which proficiently handles the coupled nonlinear system of equations. Furthermore, the reference dataset is designed to cover the flow range of functional parameters scenarios, empowering all-inclusive testing, optimal validation and training performance of the neural network system. To show the various effects of functional parameters on the performance of proposed ANNs-LMM, histogram errors, mean square errors and regression plots are visualized for each case. The absolute errors between the reference dataset ranges from <span><math><msup><mn>10</mn><mrow><mo>−</mo><mn>8</mn></mrow></msup><mspace></mspace></math></span>to<span><math><mspace></mspace><msup><mn>10</mn><mrow><mo>−</mo><mn>10</mn></mrow></msup></math></span>, reports the excellent accuracy of the intelligent ANNs-LMM approach. It is perceived that velocity profile escalates for increasing mixed convection parameter whereas it declines for higher values of power-law index parameter. The present findings are relevant in constructing nanoliquid-based systems in state-of-the-art manufacturing and coating technologies.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109709"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216567","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
Thermo-fluidic symmetry breaking in auxiliary-branched pulsating heat pipe: gravity-adaptive oscillation enhances heat transfer dynamics 辅助分支脉动热管中的热流体对称破缺:重力自适应振荡增强传热动力学
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109798
Shilong Fan , Zhiming Xu , Wei Li , YiKe Liu , Hongliang Chang
{"title":"Thermo-fluidic symmetry breaking in auxiliary-branched pulsating heat pipe: gravity-adaptive oscillation enhances heat transfer dynamics","authors":"Shilong Fan ,&nbsp;Zhiming Xu ,&nbsp;Wei Li ,&nbsp;YiKe Liu ,&nbsp;Hongliang Chang","doi":"10.1016/j.icheatmasstransfer.2025.109798","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109798","url":null,"abstract":"<div><div>This study develops an innovative branched-tandem symmetric pulsating heat pipe (BT-PHP) for thermal management of proton exchange membrane fuel cells (PEMFCs), addressing critical challenges in heat transfer efficiency, thermal response, and temperature uniformity. The experimental and numerical simulations were conducted to investigate the thermal-hydraulic performance under three representative orientations (<em>x</em>, <em>y</em>, and <em>z</em>-axis). The results show that the secondary bubble pumping effect generated by the auxiliary branch significantly enhances the working fluid flow capability, and successful start-up of three typical orientations can be achieved at 80 W heat input power; Layouts using <em>z</em> and <em>x</em>-axis orientations readily induce localized high-pressure zones (due to synergistic effects of branch channels and gravity), while <em>y</em>-axis orientation exhibit a 66 % reduction in pressure differential, optimal flow uniformity, and effective prevention of local dry-out. Under steady-state operation at 140 W, the bubble pump effect reduces thermal resistance by 20 % in <em>y</em>-axis orientation relative to <em>z</em>-axis orientation, while gravity-assisted <em>x</em>-axis orientation enhances the mitigation to 32 %. <em>y</em> and <em>x</em>-axis orientations exhibit periodic high-low pressure oscillations that sustain fluid pulsation characteristics, whereas <em>z</em>-axis orientation requires greater thermal accumulation to overcome localized high-pressure constraints. This study provides an efficient thermal management solution for PEMFC systems.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109798"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216550","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 chromosome inspired fin structure for microchannel heat sinks: CFD driven XGBR, ANN, and MLR models for thermal and fluid flow prediction 染色体启发的微通道散热器翅片结构:CFD驱动的XGBR、ANN和MLR模型用于热和流体流动预测
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109763
Rahikim Tanzim , Arup Das , Syed Nasif Zaman , Tasmia Azmi Lia , Syeda Tanjila Sarwar
{"title":"A chromosome inspired fin structure for microchannel heat sinks: CFD driven XGBR, ANN, and MLR models for thermal and fluid flow prediction","authors":"Rahikim Tanzim ,&nbsp;Arup Das ,&nbsp;Syed Nasif Zaman ,&nbsp;Tasmia Azmi Lia ,&nbsp;Syeda Tanjila Sarwar","doi":"10.1016/j.icheatmasstransfer.2025.109763","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109763","url":null,"abstract":"<div><div>Microchannel heat sinks are eminent for thermal management in microscale systems. The performance of these systems is greatly enhanced through geometric optimization and advanced nanofluids. Using water and two nanofluids (SWCNT and SWCNT-Cu) at volume fractions of 0.01 and 0.02, this work examines four new chromosome-shaped pin fin topologies, both perforated and non-perforated, embedded within a microchannel. <em>Nu</em>, pressure drop, friction factor and overall thermal performance (OTP) are assessed through numerical simulations across a range of Reynolds numbers, from 150 to 350. Results show that perforated fins perform better than non-perforated ones. The top-view perforated chromosome fin utilizing SWCNT (<em>φ</em> = 0.02) improves its <em>Nu</em> by 25 % and significantly enhances thermal uniformity. Additionally, the nanofluids' enhanced flow distribution through perforations results in a pressure drop reduction of up to 39.79 %. Perforated designs demonstrate more uniform cooling and lower peak temperatures, according to thermal studies. Results indicate that the friction factor decreases with Reynolds number and remains largely unaffected by nanofluid type. It is influenced by fin geometry rather than perforations. Three ML models are trained using simulation data to forecast performance measures. Among them, the MLR model performs exceptionally well in estimating both pressures drop (R<sup>2</sup> = 0.9999, rRMSE = 0.74 %) and Nusselt number (R<sup>2</sup> = 0.9999, rRMSE = 0.26 %). These outcomes support the integration of ML based prediction and geometry optimization for effective and scalable MCHS design. Additionally, KFold cross validation has been conducted to find the mean CV score (k = 5). To confirm the performance evaluation and cross validation, hyperparameter sensitivity analysis has been executed as well.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109763"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216568","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
CFD modeling of buoyancy-driven methane diffusion from buried pipelines into manholes: Quantifying concentration stratification and early-warning thresholds 浮力驱动甲烷从埋地管道扩散到人孔的CFD建模:量化浓度分层和预警阈值
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109768
Xuemei Wang , Xin Ba , Tianlai Hou , Yufei Tan
{"title":"CFD modeling of buoyancy-driven methane diffusion from buried pipelines into manholes: Quantifying concentration stratification and early-warning thresholds","authors":"Xuemei Wang ,&nbsp;Xin Ba ,&nbsp;Tianlai Hou ,&nbsp;Yufei Tan","doi":"10.1016/j.icheatmasstransfer.2025.109768","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109768","url":null,"abstract":"<div><div>Methane leakage from buried pipelines into adjacent confined manholes poses significant explosion hazards. Understanding transient diffusion dynamics for concentration buildup is crucial for timely detection, yet quantitative analysis of key parameters remains limited. This study establishes a validated CFD model to investigate buoyancy-driven transient methane migration from soil into manholes, focusing on impacts of gas inlet velocity, crack characteristics (size, location), and venthole dimensions on spatiotemporal concentration evolution (especially vertical stratification) and multi-tiered early-warning thresholds. Numerical simulations reveal persistent vertical stratification with higher concentrations in upper regions due to buoyancy. Inlet velocity and crack size exert exponential and strong nonlinear influences, respectively, accelerating accumulation and reducing warning times (e.g., increasing inlet velocity from 10<sup>−5</sup> m/s to 0.1 m/s shortened Level-III warning time by over 80 %; doubling crack diameter from 10 mm to 20 mm reduced alarm time by 84 %). Conversely, cracks near the base prolonged detection, while larger ventholes delayed thresholds via enhanced atmospheric exchange. These quantified relationships provide insights into mass transport in confined subsurface spaces, forming a basis for optimizing leak monitoring and risk assessment in urban infrastructure.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109768"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216552","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
Synthesis and properties of shape-stabilized composite phase change material based on biochar via molten salt thermal treatment 熔融盐热处理生物炭形状稳定复合相变材料的合成与性能研究
IF 6.4 2区 工程技术
International Communications in Heat and Mass Transfer Pub Date : 2025-10-01 DOI: 10.1016/j.icheatmasstransfer.2025.109782
Tian Xie , Jing He , Zhao Zhou , Shuaijie Yu , Ting Yan , Hongyun Hu , Hong Yao
{"title":"Synthesis and properties of shape-stabilized composite phase change material based on biochar via molten salt thermal treatment","authors":"Tian Xie ,&nbsp;Jing He ,&nbsp;Zhao Zhou ,&nbsp;Shuaijie Yu ,&nbsp;Ting Yan ,&nbsp;Hongyun Hu ,&nbsp;Hong Yao","doi":"10.1016/j.icheatmasstransfer.2025.109782","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109782","url":null,"abstract":"<div><div>To address the challenges of liquid leakage and low thermal conductivity in phase change materials (PCMs), this study synthesis high-performance shape-stable composite PCMs (ss-CPCM) using activated biochar (AC) derived from a molten salt thermal treatment as the support material. Biomass was carbonized and simultaneously activated in a NaOH/Na<sub>2</sub>CO<sub>3</sub> mixed molten salt system, yielding AC with an high specific surface area (2491.6 m<sup>2</sup>∙g<sup>−1</sup>), large pore volume (1.334 cm<sup>3</sup>∙g<sup>−1</sup>), uniform meso-micropores (∼2 nm), good thermal transfer performance (7.045 W∙m<sup>−1</sup>∙K<sup>−1</sup>) and abundant hydroxyl groups. 1-Tetradecanol (TD) was selected as the PCM and incorporated into the AC via vacuum impregnation. The ss-CPCM exhibited a high PCM loading ratio (80 %), large latent heat capacity (164.99 kJ∙kg<sup>−1</sup>) and excellent cyclic stability, retaining 93.81 % of its latent heat after 100 cycles. Meanwhile, thermal conductivity was raised by 21.9 % and 456.4 % at 25 °C and 35 °C, respectively. Theoretical calculations such as DFT, ESP, and IGMH analysis were employed to elucidate the loading mechanism and visualize the weak interactions between PCM and AC. This work presents a scalable and energy-efficient strategy for constructing carbon-based ss-CPCM with outstanding thermal conductivity and reliability, offering strong potential for low-temperature thermal energy storage applications in solar thermal utilization.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"169 ","pages":"Article 109782"},"PeriodicalIF":6.4,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216553","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
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