International Communications in Heat and Mass Transfer最新文献

{"title":"Visualization analysis of heat transfer and flow behavior in flat-plate pulsating heat pipe with sintered powder wick layer","authors":"Yue Xie ,&nbsp;Yuliang Yin ,&nbsp;Shijie Zhou ,&nbsp;Xiangdong Liu ,&nbsp;Yang Pan","doi":"10.1016/j.icheatmasstransfer.2025.109326","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109326","url":null,"abstract":"<div><div>Within this work, a flat-plate pulsating heat pipe (FPPHP) utilizing sintered powder wicks on both the channel walls and bottom was proposed. Using visualization techniques, the vapor-liquid flow pattern evolution, quasi-steady flow motion modes, and heat transfer performance of the FPPHP with sintered powder wicks as well as a FPPHP with smooth channels were analyzed. And more, through comparison, the influence of the sintered powder wicks on the thermo-hydrodynamic characteristics of the FPPHPs was summarized. Results indicate that the vapor-liquid flow patterns existing in both FPPHPs predominantly consist of bubbly flow, slug flow, annular flow, along with the transitional flow from bubbly to slug flow. Under vertical orientation, the quasi-steady flow motion modes of the FPPHPs include stagnation (S), intermittent pulsation (S&amp;P), and small pulsations/large pulsations (P). These modes are accompanied by various vapor-liquid flow behaviors, such as bubble growth and aggregation, the coalescence between bubbles and slugs, and the fragmentation of extended slugs. After start-up, the thermal resistance of the FPPHP with sintered powder wicks is lower than that with smooth channels under different filling ratios, which demonstrates the beneficial influence of introducing capillary wicks on heat transfer of FPPHP.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109326"},"PeriodicalIF":6.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670950","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}

{"title":"Influence of graphene nanoplate size and heat flux on nanofluid heat exchanger performance: A molecular dynamics approach","authors":"Zhongxiu Yang ,&nbsp;Ali Basem ,&nbsp;Dheyaa J. Jasim ,&nbsp;Narinderjit Singh Sawaran Singh ,&nbsp;Salman Saeidlou ,&nbsp;Mohammed Al-Bahrani ,&nbsp;S. Mohammad Sajadi ,&nbsp;Soheil Salahshour ,&nbsp;Ali Mohammadi Hasanabad","doi":"10.1016/j.icheatmasstransfer.2025.109386","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109386","url":null,"abstract":"<div><div>This study aimed to enhance the thermal efficiency of nanofluid-based heat exchangers by exploring the simultaneous effects of external heat flux and graphene nanoplate sizes on thermal and structural characteristics. Effective heat transfer is a critical requirement for managing heat in microscale systems, where optimizing the thermal performance of nanofluids can improve device performance. Molecular dynamics simulations were carried out of a sinusoidal inner surface copper heat exchanger coated with silicon nanoparticles to demonstrate atomic-level interaction within the nanofluid. The significant findings showed that while an external rising heat flux decreased heat flux from 41.7 to 37.26 W/m² and thermal conductivity of nanofluid from 14.53 to 13.80 W/m·K, only an increase in viscosity from 0.32 to 0.49 mPa·s, the agglomeration time of nanoparticles decreased from 3.71 to 3.33 ns and friction coefficient from 0.022 to 0.015, could indicate a difference in particle behavior responding to the thermal stress. However, the size of the graphene nanoplate from 5 to 15 Å increases the heat flux from 40.05 to 46.77 W/m² and thermal conductivity of the nanofluid from 14.15 to 14.99 W/m·K, since the larger graphene nanoplate films can produce a more substantial covalent bonding and link interlayer coupling. In contrast, the larger nanoplate also enhanced viscosity from 0.30 to 0.39 mPa·s, aggregation time from 3.64 to 4.01 ns, and friction coefficient from 0.020 to 0.026, which indicated lower particle mobility. This study was the first of its kind to contribute to the existing knowledge gap by investigating the simultaneous effect of both the nanoplate size and external heat flux in an oscillating microchannel heat exchanger. The knowledge provided offers an experimental pathway in optimizing the nanofluid properties and the heat exchanger geometry for improved thermal management for compact and microscale applications.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109386"},"PeriodicalIF":6.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670636","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}

{"title":"Enhancing the thermal performance of a phase change energy storage assisted ventilation system via unit structure optimization for data center","authors":"Hongli Xu ,&nbsp;Jiri Zhou ,&nbsp;Xing Liang ,&nbsp;Xiaoyan Yi ,&nbsp;Hongwei Wu ,&nbsp;Ruiyong Mao ,&nbsp;Zujing Zhang","doi":"10.1016/j.icheatmasstransfer.2025.109396","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109396","url":null,"abstract":"<div><div>This numerical study aims to improve the melting uniformity of the phase change plate (PCP) by optimizing structure, enhancing the energy efficiency of PCP's application in the ventilation system of data centers. The anterior-to-posterior slope ratio (<em>W</em>_<em>r</em>), fin configuration, and volume of the PCP are optimized. For the practical application of the PCP with an optimized structure and configuration, the effects of ambient temperature, air supply velocity, phase change temperature and thermal conductivity have been studied. The main results are as follows: (i) When the PCP changes from a rectangular body to a trapezoidal body, the uniformity of melting is improved by 93 %. The average cooling range of PCP increases by 0.5 °C, and the energy-saving rate increases by 22 %. (ii) The structure of the PCP with the volume of 19 L, a <em>W</em>_<em>r</em> of 1.5 and double fin arranged horizontally parallel to the PCP effectively shorts the charging time from 14 h to 11.6 h. (iii) A nonlinear functional relationship between the cooling performance of the system and the main four variables is proposed. This work provides guidelines for the application of PCP in data center.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109396"},"PeriodicalIF":6.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670627","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}

{"title":"Prediction of multiple complex crude oil condensation points based on least squares support vector machine","authors":"Xiaoqin Xiong ,&nbsp;Ziwei Wang ,&nbsp;Xiaokai Xing ,&nbsp;Ning Xu ,&nbsp;Ziqiang Sun","doi":"10.1016/j.icheatmasstransfer.2025.109319","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109319","url":null,"abstract":"<div><div>The prediction of multiple complex crude oil condensation points has attracted great attention in oil and gas industry. In this paper, firstly, a least squares vector machine parameter optimization method based on Bayesian algorithm is proposed, and a prediction model is established and applied to predict the condensation point of various complex crude oils. Then, the proposed algorithm is compared with the existing condensation point prediction methods and the standard Least squares support vector machine (LSSVM) model. Thirdly, it confirms the feasibility of the proposed method for actual production processes, ensuring the safety and stability of crude oil transportation. Results show that: (a) The Bayesian algorithm uses probabilistic surrogate models and collection functions to effectively optimize the parameters of the model to the most suitable values. (b) The LSSVM algorithm based on Bayesian optimization increases the computation time and maximum absolute deviation (MAD) of the samples. (c) Although the method proposed in this article slightly increases computation time, it can achieve higher accuracy.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109319"},"PeriodicalIF":6.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672148","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}

{"title":"Generalized theory for wall shear stress measurement using circular-segment electrodiffusion probes","authors":"Vaclav Harrandt ,&nbsp;Yaroslav Bazaikin ,&nbsp;Florian Huchet ,&nbsp;Jaroslav Tihon ,&nbsp;Jaromir Havlica","doi":"10.1016/j.icheatmasstransfer.2025.109322","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109322","url":null,"abstract":"<div><div>The present work establishes a new theoretical framework for wall shear stress measurements with electrodiffusion probes composed of circular segments, a generalization of the theory previously derived for twin semicircular probes. This newly proposed probe design extends the capabilities of near-wall flow measurements and provides deeper insights into boundary layer behavior. By deriving analytical formulas for the mass transfer coefficients, the study quantifies how the probe geometry and fluid flow direction affect mass transfer to each segment of the probe. A numerical solution of the convection–diffusion equation confirms the validity of these analytical formulas. In addition, a practical methodology for evaluating experimental measurements is presented that allows the electrical currents collected by the probe to be converted into a wall shear stress vector. The influence of the insulation gap position on diagnostic performance is also discussed, highlighting how different probe geometries can refine the sensitivity and accuracy of the measurement. Overall, the proposed approach broadens the possibilities of electrodiffusion-based measurements, allowing for a more versatile and detailed characterization of near-wall transport phenomena.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109322"},"PeriodicalIF":6.4,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144670625","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}

{"title":"Study on the enhancement of phase change thermal storage performance by biomimetic horseshoe (BH) shaped pipe structure coupled with fins and nanoparticles","authors":"Baofeng Li ,&nbsp;Xinle Yang ,&nbsp;Ning Yu ,&nbsp;Weikang Li ,&nbsp;Tao Jiang ,&nbsp;Shaoyi Suo ,&nbsp;Jia Liu ,&nbsp;Linsong Jiang ,&nbsp;Xin Wang ,&nbsp;Yan Lv ,&nbsp;Guifu Tang","doi":"10.1016/j.icheatmasstransfer.2025.109393","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109393","url":null,"abstract":"<div><div>Effective energy storage technology is needed due to rising worldwide industrialization. Although phase change materials (PCM) have great energy storage density, their low thermal conductivity limits their use. The single enhancement method struggles to tackle multi-scale thermal resistance. For this, a multi-scale cooperative system of “bionic horseshoe-shaped tube-fin-nanofluid” is developed, and multi-physics coupling technology simulates the phase transition. The results show that the 7 horseshoe-shaped structure shortens the melting time of PCM by 36.11 % and increases the heat transfer efficiency by 43.29 % by expanding the heat exchange area and inducing the flow field disturbance, which confirms the key role of geometric optimization in thermal enhancement. In addition, the 10 mm V-shaped fin reduced the melting time by 19.84 %, demonstrating a quantitative relationship between fin diameter and convection efficiency. The system with 0.01 volume fraction of SiO₂ nanofluids reduces melting time to 27 min, a 21.28 % improvement over pure PCM, demonstrating the benefits of nano-reinforcement and structural optimization. At 363.15 K, it increases thermal efficiency by 66.86 % and enhances heat storage uniformity. This research introduces a multi-scale collaborative design for latent heat storage systems, advancing the efficient use of renewable energy.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109393"},"PeriodicalIF":6.4,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662780","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}

{"title":"Optimization of water spray parameters for an infrared suppression (IRS) device based on regression orthogonal design and AHP-entropy method","authors":"Yitao Zou ,&nbsp;Chenghui Qiu ,&nbsp;Nenglin Yuan ,&nbsp;Hong Shi ,&nbsp;Benben Kong ,&nbsp;Yanlong Jiang","doi":"10.1016/j.icheatmasstransfer.2025.109378","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109378","url":null,"abstract":"<div><div>As an advanced infrared suppression technique, water spray can significantly reduce the ship exhaust temperature, but its application may cause flow loss and bring additional energy consumption to the ship engine. In this study, the regression orthogonal design is combined with the analytic hierarchy process-entropy (AHP-entropy) method, and is innovatively used for the multi-objective optimization of water spray setting of a marine infrared suppression (IRS) device. Relations between optimization objectives and spray parameters are developed based on the regression orthogonal experiment. The influences of droplet diameter (<em>x</em>₁), droplet velocity (<em>x</em>₂), water flow rate (<em>x</em>₃), and spray angle (<em>x</em>₄) on the device infrared radiation and pressure loss are revealed by visual analysis of the regression eqs. A comprehensive assessment for the importance of device performance indicators is conducted with the combination of AHP and entropy methods. Under the consideration of both subjective and objective effects, the indicator weights are reasonably allocated. The final optimization results show that at the spray setting of <em>x</em>₁ = 20 μm, <em>x</em>₂ = 80 m/s, <em>x</em>₃ = 2.032 kg/s, and <em>x</em>₄ = 30°, compared with no-spray case, the radiation intensity of the device can decrease by 69.62 % with only 1.90 % increase of the pressure drop coefficient.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109378"},"PeriodicalIF":6.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655034","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}

{"title":"Flow and heat transfer performance of supercritical CO2 compact receivers with cylindrical fins under sidewall heating condition","authors":"Zhen-Dong Zhang ,&nbsp;Kun Wang ,&nbsp;Yan-Jun Liu ,&nbsp;Xiao-Long Li ,&nbsp;Yuan-Hong Fan ,&nbsp;Chun-Hua Min","doi":"10.1016/j.icheatmasstransfer.2025.109351","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109351","url":null,"abstract":"<div><div>Compact receiver with discontinuous cylindrical fins is one of the most promising configurations for supercritical CO₂ (S-CO₂) solar receivers. However, the high heat flux and the dramatic thermophysical property variations of S-CO₂ induce significant buoyancy and thermal acceleration. Furthermore, due to the discontinuous channel and the horizontal flow with sidewall heating conditions, the buoyancy will not only affect flow in the near-wall region, but also cause the changes of the main flow direction, leading to complex flow and heat transfer phenomenon. To solve this issue, the effect of buoyancy in the cylindrical fin compact receiver was numerically analyzed from two aspects: the main flow inclination and the near-wall flow field. The results showed that the flow inclination mainly affects the heat transfer by changing the streamwise spacing of the fin. The near-wall flow field analysis indicated that the boundary layer thickening and reduction of turbulent kinetic energy induced by the buoyancy caused local heat transfer deterioration. Thermal acceleration increased the thickening of the boundary layer, leading to further deterioration in heat transfer. The critical thresholds for buoyancy and thermal acceleration are identified as <em>Ri</em> = 5.7 × 10⁻³ and <em>Ac</em> = 5.8 × 10⁻⁷, respectively. A new heat transfer correlation was developed with a maximum error of 8.4 %.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109351"},"PeriodicalIF":6.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662777","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}

{"title":"Heat transfer assessment and performance enhancement of a Jaggery production unit using CFD simulations and field studies","authors":"Alok Kumar ,&nbsp;Krishnakant Agrawal ,&nbsp;Devershi Mourya ,&nbsp;S.K. Tyagi","doi":"10.1016/j.icheatmasstransfer.2025.109361","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109361","url":null,"abstract":"<div><div>Energy efficiency in traditional bagasse-fired furnaces for jaggery production is essential to reduce bagasse consumption and associated air pollution. In the present study, numerical analysis of heat transfer phenomena in a four-pan jaggery unit in rural India is conducted and validated using field data. The detailed spatial distribution of various thermal and flow-field quantities is provided by numerical simulations. It has been found that for the high temperature firing involved in these traditional units, radiation is the dominant mode of heat transfer to the pans rather than convection. Design modifications, such as adjusting inlet position and area, had minimal effects due to convection's limited role. However, implementing a deep-pan strategy significantly improved thermal efficiency by 1.3 times, primarily due to increased radiative heat transfer area. Furthermore, the comparative benefit of adding a ceramic blanket of varying thickness from 1 to 4 inches has been assessed in the model and is found to be modest. It is found that 2 inches insulation thickness is sufficient above which there is no additional benefit and will be most effective at the furnace top wall (at sides of pans). These findings can help rural entrepreneurs to design more efficient and cleaner jaggery production systems.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109361"},"PeriodicalIF":6.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662775","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}

{"title":"Analysis of the effect of wavy fin configuration and wavy fin splitting on the behavior of hydrothermal approach in a double pipe - Heat exchanger","authors":"Basim Freegah,&nbsp;Dhamyaa Saad Khudhur,&nbsp;Ammar A. Hussain Al-Taee,&nbsp;Haya Hussein","doi":"10.1016/j.icheatmasstransfer.2025.109385","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109385","url":null,"abstract":"<div><div>This study delves into the influence of wavy and split fin configurations on Double-Pipe Heat Exchangers (DPHEs) using experimental and numerical analyses via ANSYS Fluent 2022 R1. By creating 3-D models to assess the Nusselt (<em>Nu</em>) number, friction coefficient, and thermal resistance, the research underscores the substantial impact of fin arrangement on DPHE performance. Notably, Model A (wavy fins, eight fins) demonstrates a remarkable 43.98 % increase in Nusselt number and an average Overall Performance Factor (O.P·F.) of around 1.3278. The study affirms the efficacy of wavy and split fin designs in enhancing heat transfer efficiency, offering valuable insights for heat exchanger systems. The novelty lies in quantifying the significant performance gains achievable through specific fin configurations, thus contributing to the optimization of heat exchanger design beyond previous efforts in the literature.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"167 ","pages":"Article 109385"},"PeriodicalIF":6.4,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655061","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}