International Journal of Heat and Mass Transfer最新文献_第4页

Close-contact melting of a cylindrical phase change material block on a heated surface 圆柱形相变材料块在受热表面上的紧密接触熔化

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-04 DOI: 10.1016/j.ijheatmasstransfer.2025.128175

Doron Sahray , Robert A. Stavins , Vivek S. Garimella , Elad Koronio , William P. King , Nenad Miljkovic , Gennady Ziskind

This study focuses on a basic configuration in which Close-Contact Melting (CCM) takes place, namely, a vertical cylindrical block of a Phase-Change Material (PCM), melting under its own weight on a heated horizontal surface while surrounded by air. The initial purpose is to demonstrate that the widely used enthalpy–porosity approach fails to address even this simple configuration properly, and to suggest practical ways to overcome this major drawback. Accordingly, to capture the dynamics of CCM and its inherent features without distortions, a numerical approach is developed that incorporates an additional source term directly into the momentum equation. The suggested method allows gravity to act selectively on the solid phase, enabling it to descend as a rigid body without deformation. Consequently, the model overcomes the damping limitations of the conventional mushy-zone parameter of the enthalpy–porosity approach, facilitating a realistic simulation of heat transfer, phase change, and liquid motion in the thin layer between the heated surface and solid PCM. The method is validated against experimental data and with several benchmark experimental datasets from the literature concerning in-depth CCM studies. The results demonstrate excellent agreement in solid descent, melting front evolution, and liquid layer behavior. In addition, a parametric study is performed to quantify the influence of sample geometry and applied heat flux on the melting rate, pressure distribution, and liquid layer thickness. On the theoretical side, it is argued that the problem in question is similar to the classical squeezing flow configuration, and some insights gained there are applicable in the current study. Thus, this research refines the enthalpy–porosity method and establishes a robust simulation framework for analyzing CCM. These outcomes provide a foundation for future studies of similar processes in thermal energy storage and thermal management solutions that involve PCMs, where extended surfaces and external loading may be used to further enhance the PCM thermal performance.

本研究的重点是密切接触熔化（CCM）发生的基本配置，即相变材料（PCM）的垂直圆柱形块，在加热的水平表面上以自身重量熔化，同时被空气包围。最初的目的是证明广泛使用的焓-孔隙度方法甚至不能正确地解决这种简单的配置，并提出克服这一主要缺点的实用方法。因此，为了在不失真的情况下捕捉CCM的动力学及其固有特征，开发了一种数值方法，该方法将额外的源项直接纳入动量方程。建议的方法允许重力选择性地作用于固体相，使其作为刚体下降而不变形。因此，该模型克服了传统焓孔方法的糊状区参数的阻尼限制，便于真实地模拟受热表面与固体PCM之间薄层中的传热、相变和液体运动。该方法通过实验数据和来自深入CCM研究文献的几个基准实验数据集进行了验证。结果表明，在固体下降、熔融锋演化和液层行为方面具有很好的一致性。此外，还进行了参数化研究，以量化样品几何形状和外加热通量对熔化速率、压力分布和液层厚度的影响。在理论方面，本文认为所讨论的问题类似于经典的挤压流构型，并且从中获得的一些见解适用于当前的研究。因此，本研究完善了焓孔法，建立了分析CCM的鲁棒模拟框架。这些结果为未来研究类似的热能储存过程和涉及PCM的热管理解决方案奠定了基础，其中扩展表面和外部负载可用于进一步提高PCM的热性能。

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引用次数: 0

Efficient thermal regulation using pumped two-phase flow 采用泵送两相流的高效热调节

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-04 DOI: 10.1016/j.ijheatmasstransfer.2025.128209

Tianhao Yuan , Xuan Zhang , Haiyang Liu , Chengbin Zhang

Efficient temperature control of compact electronic devices that intermittently emit short bursts of high heat flux presents a significant challenge. This paper proposes a promising and effective solution by the implementation of a pumped two-phase loop (PTL) system integrated with a latent heat storage (LHS) unit. A simulation study is conducted to examine the dynamic thermal response of the pumped two-phase loop during a thermal shock of 10 kW class, with a focus on the effects of varying heat loads, LHS unit configurations, and mass flow rates on system performance. The results indicate that the integration of an LHS unit into a PTL system significantly mitigates temperature and pressure fluctuations in response to transient high heat fluxes and reduces peak evaporator wall temperatures. The LHS configuration in which the phase change material (PCM) is stored inside the metal tube while the working fluid flows externally demonstrates superior heat transfer performance. The pumped two-phase loop consumes less power while maintaining efficient cooling performance when the dryness of the working fluid at the evaporator outlet is adjusted between 0.32 and 0.43.

间歇式发射高热流短脉冲的小型电子器件的有效温度控制是一个重大挑战。本文提出了一种有前途的有效解决方案，即将泵送两相回路（PTL）系统与潜热储存（LHS）装置集成在一起。为了研究10 kW级热冲击时泵送两相回路的动态热响应，进行了仿真研究，重点研究了不同热负荷、LHS机组配置和质量流量对系统性能的影响。结果表明，将LHS机组集成到PTL系统中，可以显著减轻瞬态高热流的温度和压力波动，降低蒸发器壁温度峰值。相变材料（PCM）储存在金属管内，而工作流体在外部流动的LHS结构显示出优越的传热性能。当蒸发器出口工作流体的干燥度在0.32 ~ 0.43之间调节时，泵送两相回路在保持高效冷却性能的同时消耗更少的功率。

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引用次数: 0

Modelling and analysis of induction preheating of moving filler wire for directed energy deposition 定向能沉积移动填充丝感应预热建模与分析

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-04 DOI: 10.1016/j.ijheatmasstransfer.2025.128192

Ruofeng Cao, Yongle Sun, Wojciech Suder, Xin Chen, Zhiyong Li, Stewart Williams

Induction preheating of filler wire is an emerging auxiliary process that allows precise control of wire temperature before melting by a main energy source in directed energy deposition (DED). This can enhance deposition rate and reduce defects. The induction heating mechanism for DED applications needs to be understood for establishing a robust process window that integrates coil design and key process parameters. This study investigates the evolution of electromagnetic and thermal fields during induction heating of a stainless-steel filler wire moving through a helical coil. A coupled electromagnetic-thermal model of a moving wire was developed to determine the magnetic flux, eddy current, temperature, and energy transfer efficiency. The wire temperatures predicted by the multiphysics model are consistent with experimental measurements under diverse conditions, with an error of less than 7 % after the heating reaches a steady state. The typical energy transfer efficiency for a wire diameter of 1.6 mm ranges in 3 %-9 %, which can be significantly enhanced through increasing the wire diameter and reducing the radial distance to the coil. The model enables a deeper understanding of the electromagnetic-thermal mechanisms governing both the transient and steady-state temperature distributions in the wire. In the steady state, the peak temperature is located immediately outside the exit end of the coil, and the temperature gradient across the wire diameter is marginal. A sensitivity analysis to identify dominant parameters was also carried out, showing that the wire feed speed (up to 150 mm/s), coil current (up to 700 A) and frequency (up to 500 kHz) are most influential. This study demonstrates an effective modelling approach to induction heating of moving wire, and it also provides critical insights for designing and optimising the induction coil and process for preheating filler wires in additive manufacturing and other similar processes (e.g. welding and cladding).

填充丝的感应预热是一种新兴的辅助工艺，可以在定向能沉积（DED）中通过主能量源精确控制丝的熔化前温度。这样可以提高沉积速度，减少缺陷。需要了解DED应用的感应加热机制，以便建立一个集成线圈设计和关键工艺参数的强大工艺窗口。本文研究了不锈钢填充丝在螺旋线圈中感应加热时电磁场和磁场的演变。建立了运动导线的电磁-热耦合模型，计算了运动导线的磁通、涡流、温度和能量传递效率。多物理场模型预测的导线温度在不同条件下与实验测量结果一致，加热达到稳态后误差小于7%。当线材直径为1.6 mm时，典型的能量传递效率在3% - 9%之间，通过增大线材直径和减小到线圈的径向距离可以显著提高能量传递效率。该模型能够更深入地了解控制导线中瞬态和稳态温度分布的电磁-热机制。在稳定状态下，峰值温度位于线圈的出口端外，并且沿线径的温度梯度是边缘的。还进行了灵敏度分析，以确定主要参数，表明送丝速度（高达150毫米/秒），线圈电流（高达700 A）和频率（高达500 kHz）是最具影响力的。本研究展示了一种有效的运动导线感应加热建模方法，并为增材制造和其他类似工艺（例如焊接和包覆）中预热填充导线的感应线圈和工艺的设计和优化提供了重要见解。

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引用次数: 0

Improvement of heat-mass transfer performance of finned tube heat exchangers via superhydrophilic-superhydrophobic dot arrays for dehumidification in greenhouse environment 利用超亲疏水点阵改善温室除湿翅片管换热器的传热传质性能

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-04 DOI: 10.1016/j.ijheatmasstransfer.2025.128199

Wanling Hu , Changcong Jiang , Yong Guan , Xiuxiu Zhang , Jianyu Hao , Chengxu Wang , Juanli Ma

Greenhouses in high-altitude regions often encounter challenges of low temperature and excessive humidity. These result from structural and climatic constraints, leading to high energy consumption for dehumidification. Conventional finned-tube heat exchangers (FTHXs), as core components of refrigeration and dehumidification systems, suffer from inefficient heat transfer and condensate retention, which exacerbate operational losses. To address these limitations, this study proposes a novel finned-tube heat exchanger with superhydrophilic-superhydrophobic dot array (FTHX-SSDA) and introduces a heat and mass transfer enhancement factor (JF_hm). A numerical heat transfer model was developed, and computational fluid dynamics (CFD) simulations were conducted to analyze the thermal and hydraulic performance of the FTHX-SSDA under low-temperature, high-humidity conditions. The results demonstrate that, compared to a finned-tube heat exchanger with hydrophilic-surface (FTHX-HS), the FTHX-SSDA exhibits superior performance. Average enhancements include 31.89 % in the heat transfer factor (j_h), 21.37 % in the mass transfer factor (j_m), and a 1.19 % reduction in the friction factor (f). The JF_hm consistently exceeds unity, confirming the excellent thermal efficiency of the FTHX-SSDA. Furthermore, both j_h and j_m decrease with increasing air-side Reynolds number. However, higher inlet air temperature elevated relative humidity, or lower tube wall temperature improve heat and mass transfer performance. The fitted performance correlation equations for the FTHX-SSDA’s air-side performance under low-temperature, high-humidity conditions were derived. The average errors were 0.6 % (j_h), 0.24 % (j_m), and 0.1 % (f), indicating high predictive accuracy. These results provide valuable technical insights and serve as a reference for improving and optimizing dehumidification systems in greenhouse settings.

高海拔地区的温室经常面临低温、高湿的挑战。这是由于结构和气候的限制，导致高能耗的除湿。传统翅片管换热器（FTHXs）作为制冷和除湿系统的核心部件，存在传热效率低和冷凝水滞留的问题，加剧了运行损失。为了解决这些限制，本研究提出了一种新型的超亲疏水点阵列（FTHX-SSDA）翅片管换热器，并引入了传热传质增强因子（JFhm）。建立了FTHX-SSDA的数值传热模型，并进行了计算流体力学（CFD）模拟，分析了FTHX-SSDA在低温高湿条件下的热工性能和水力性能。结果表明，与具有亲水表面的翅片管换热器（FTHX-HS）相比，FTHX-SSDA具有更优越的性能。传热系数（jh）平均提高31.89%，传质系数（jm）平均提高21.37%，摩擦系数(f)平均降低1.19%。JFhm持续超过单位，证实了FTHX-SSDA的优异热效率。jh和jm随空气侧雷诺数的增加而减小。然而，较高的入口空气温度提高相对湿度，或较低的管壁温度改善传热传质性能。推导了低温、高湿条件下FTHX-SSDA空侧性能的拟合相关方程。平均误差分别为0.6% （jh）、0.24% （jm）和0.1% (f)，预测精度较高。这些结果提供了有价值的技术见解，并为改进和优化温室环境中的除湿系统提供了参考。

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引用次数: 0

Experimental research on heat transfer enhancement and pressure drop in tube fitted with foam copper on the shape of twisted tape 扭曲带形泡沫铜管内强化传热和压降的实验研究

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-03 DOI: 10.1016/j.ijheatmasstransfer.2025.128194

Jin Xin , Zhou Zibo , Yin Hongyi , Yu Xueqian , Wu Yujuan

Based on the core flow theory and boundary layer theory, this study proposes a novel heat transfer enhancement element for tubular heat exchangers: a twisted tape fabricated from open-cell copper foam. Experimental investigations were conducted to analyze the heat transfer characteristics, resistance characteristics, and overall thermal-hydraulic performance of tubes equipped with these copper foam twisted tapes under turbulent flow conditions. Empirical correlations for the Nusselt number (Nu) and friction factor (f) were established. An experimental platform was designed and constructed, and its validity was confirmed through a benchmark case study. The platform was subsequently employed to simulate the performance of the proposed copper foam twisted tape inserts. Results indicate that, compared to solid thick twisted tapes, the copper foam twisted tapes significantly enhance the Nusselt number and the heat transfer effect, albeit with an associated increase in the pressure drop resistance coefficient. The experimental findings show good agreement with established empirical correlations within acceptable error margins. Furthermore, leveraging the experimental data and existing empirical formulas, this paper introduces a new mathematical model tailored for calculating the performance of the specific copper foam twisted tapes studied herein. This work presents, for the first time, a relevant computational mathematical model for tubular heat exchangers incorporating copper foam twisted tape inserts, offering a new design paradigm for such enhanced structures.

基于核心流动理论和边界层理论，提出了一种新型管式换热器强化传热元件：开孔泡沫铜扭曲带。通过实验研究，分析了在紊流条件下，装有这些泡沫铜扭带的管道的传热特性、阻力特性和整体热工性能。建立了努塞尔数（Nu）与摩擦因数(f)的经验相关关系。设计并搭建了实验平台，并通过基准案例分析验证了其有效性。随后，该平台被用于模拟所提出的泡沫铜扭曲带插入件的性能。结果表明，与固体厚扭带相比，泡沫铜扭带显著提高了努塞尔数和换热效果，但同时也增加了压降阻力系数。实验结果在可接受的误差范围内与已建立的经验相关性显示出良好的一致性。在此基础上，结合实验数据和已有的经验公式，提出了一种新的计算泡沫铜扭带性能的数学模型。这项工作首次提出了包含泡沫铜扭曲带插入的管式热交换器的相关计算数学模型，为这种增强结构提供了新的设计范式。

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引用次数: 0

Pseudo-boiling analysis of thermal boundary effects on supercritical CO2 cooling in Scramjets 超燃冲压发动机超临界CO2冷却热边界效应的拟沸腾分析

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-03 DOI: 10.1016/j.ijheatmasstransfer.2025.128207

Daoming Ye , Xiongzhou Xie , Jianyong Wang

Scramjet encounters increasingly thermal protection challenges during the prolonged hypersonic flights. To effectively address this critical issue, the novel cooling medium supercritical carbon dioxide (sCO₂) is employed with the closed Brayton cycle incorporated for advanced thermal management. This study uses RANS simulations based upon the SST k-ω turbulence model to systematically analyze the flow and heat transfer characteristics of sCO₂ in the cooling microchannels exposed to extreme heating of scramjet engine walls. Four typical thermal boundary conditions were imposed, their influences covering a range of operating conditions have been discussed, and the pseudo-boiling theory is invoked to elucidate the underlying mechanisms from in-depth fundamental aspects. Results indicate that the thermal boundary prominently influences sCO₂ flow and heat transfer in the cooling channel, in particular within the upstream region, where the VL (vapor-like) layer forms and develops characterized by the pseudo-boiling phenomenon. Variations in operating conditions bring about changes in impact level of thermal boundaries, with decreasing ṁ and increasing T_in and P of sCO₂ flows being likely to attenuate the boundaries’ influences, which is mainly attributed to the alteration in the phase change region and pseudo-boiling effects.

超燃冲压发动机在长时间的高超声速飞行中面临越来越多的热防护挑战。为了有效解决这一关键问题，采用了新型冷却介质超临界二氧化碳（sCO2），并采用了封闭的布雷顿循环，以实现先进的热管理。本研究采用基于SST k-ω湍流模型的RANS模拟，系统分析了超燃冲压发动机壁面极端加热下冷却微通道中sCO2的流动和换热特性。施加了四种典型的热边界条件，讨论了它们对一系列操作条件的影响，并援引拟沸腾理论从基本方面深入阐明了其潜在机制。结果表明，热边界显著影响冷却通道内sCO2的流动和换热，特别是在上游区域，VL（蒸汽样）层的形成和发展以伪沸腾现象为特征。操作条件的变化会导致热边界影响程度的变化，sCO2流动Tin和P的降低和增加可能会减弱热边界的影响，这主要是由于相变区的改变和伪沸腾效应。

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引用次数: 0

Effect of biopolymer treatment on soil thermal conductivity under varying moisture conditions by AH-FBG 生物聚合物处理对不同湿度条件下土壤导热系数的影响

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-03 DOI: 10.1016/j.ijheatmasstransfer.2025.128200

Peng Wu , Jin Liu , Mengya Sun , Wenyue Che , Xingping Shi , Tingwei Huang , Miao Jing , Runqi Zhang

Research on the thermal properties of biopolymer treated soils remains limited despite their significance in regulating heat and moisture transfer. This study employed actively heated fiber Bragg grating (AH-FBG) technology to explore the thermal behavior of biopolymer treated soil under varying moisture contents and biopolymer (locust bean gum, LBG) concentrations. Thermal response experiments and microscopic analyses were conducted to examine the effects of moisture content and biopolymer concentration on soil thermal conductivity. The key findings are follows: the optimal heating parameters are 19.2 W/m and 20 min, striking a balance between measurement accuracy and minimal moisture migration. Both parameters and biopolymer concentration jointly affecting the position and shape of the moisture–temperature response curves. The Côté and Konrad model effectively captures the relationship between thermal conductivity and moisture content, with the conductivity increasing by about 2.8 times as moisture content rises from 6 % to 30 % at a 1 % biopolymer concentration. The effect of biopolymer on thermal conductivity is influenced by moisture content. At low moisture content, biopolymer shows a negligible effect on thermal conductivity. However, as moisture content increases, thermal conductivity initially increases with biopolymer concentration but decreases after reaching an inflection point at 1 %. Biopolymer interacts with soil particles through adhesion and bridging, suppressing the formation of large-sized pores. Biopolymer regulates soil thermal conductivity through two mechanisms: enhancing the heat transfer pathways and breaking the water bridge. Both mechanisms contribute comparably at a low moisture content; as the moisture content increases, the breakdown in water bridge gradually becomes dominant.

尽管生物聚合物处理土壤在调节热湿传递方面具有重要意义，但对其热特性的研究仍然有限。本研究采用主动加热光纤布拉格光栅（AH-FBG）技术研究了不同含水量和生物聚合物（刺槐豆胶，LBG）浓度下生物聚合物处理土壤的热行为。通过热响应实验和微观分析研究了土壤含水量和生物聚合物浓度对土壤导热系数的影响。主要发现如下：最佳加热参数为19.2 W/m和20 min，在测量精度和最小水分迁移之间取得了平衡。参数和生物聚合物浓度共同影响湿温响应曲线的位置和形状。Côté和Konrad模型有效地捕获了导热系数和水分含量之间的关系，在1%的生物聚合物浓度下，当水分含量从6%增加到30%时，导热系数增加了约2.8倍。生物聚合物对导热性能的影响受其含水率的影响。在低水分含量下，生物聚合物对导热性的影响可以忽略不计。然而，随着水分含量的增加，导热系数最初随着生物聚合物浓度的增加而增加，但在达到1%的拐点后下降。生物聚合物通过黏附和桥接与土壤颗粒相互作用，抑制大孔的形成。生物聚合物通过增强传热途径和破坏水桥两种机制调节土壤热导率。两种机制在低含水率下都有相当的贡献；随着含水率的增加，水桥击穿逐渐占主导地位。

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引用次数: 0

Experimental investigation of flow characteristics and heat transfer in dual synthetic jets laterally over a heating plate 双合成射流在加热板上横向流动特性及传热的实验研究

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-03 DOI: 10.1016/j.ijheatmasstransfer.2025.128202

Yuanyuan Liu, Zhenbing Luo, Ying Kang, Wenqiang Peng, Zhijie Zhao, Xinyu Liang

As one of the most promising active flow control technologies, the synthetic jet has garnered significant attention in heat transfer enhancement. However, the heat transfer performance of the synthetic jet exhibits a strong dependence on the impingement distance. This study proposes a novel configuration of dual synthetic jets laterally over a heating plate to address the limitation on installation height. The flow and heat transfer characteristics were investigated using particle image velocimetry and an infrared camera. The experimental results show that the jet Reynolds number (Re_j) and operating frequency (f_A) govern the vortex evolution. The primary vortex (PV) formed at f_A = 600 Hz (Re_j = 1200–1500) directly induces the separation of the wall shear layer, and gradually breaks into secondary vortices during its downstream evolution. Such mechanisms result in periodic flow separation within the wall shear layer, thereby enhancing heat transfer. In contrast, the PV formed at f_A = 800 and 1000 Hz (Re_j = 700–950) exhibits strong vortices breaking and merging, keeping the wall shear layer in a state of flow separation throughout the actuator excitation cycle, thereby enhancing heat transfer. The dual synthetic jets can be considered as low-Reynolds-number turbulence, with heat transfer performance approximately 4–5 times that of a laminar boundary layer at the same stream Reynolds number. The temperature non-uniformity of the lateral configuration is 0.3–2.0 °C, and the area efficiency is at least twice that of the vertical configuration. Overall, the lateral configuration demonstrates a smaller installation height, a larger heat transfer area, and uniform temperature distribution.

合成射流作为一种极具发展前景的主动流动控制技术，在强化换热方面受到了广泛的关注。然而，合成射流的传热性能表现出强烈的依赖于撞击距离。本研究提出了一种新的配置双合成射流横向加热板，以解决安装高度的限制。利用粒子图像测速仪和红外摄像机对其流动和传热特性进行了研究。实验结果表明，射流雷诺数（Rej）和工作频率（fA）控制着涡的演化。在fA = 600 Hz （Rej = 1200 ~ 1500）下形成的一次涡（PV）直接导致了壁面剪切层的分离，并在其下游演化过程中逐渐破裂为二次涡。这种机制导致壁面剪切层内的周期性流动分离，从而增强传热。相比之下，fA = 800和1000 Hz （Rej = 700-950）形成的PV表现出强烈的旋涡破裂和合并，使壁面剪切层在整个激励周期内处于流动分离状态，从而增强了传热。双合成射流可视为低雷诺数湍流，其换热性能约为相同流雷诺数下层流边界层的4-5倍。横向配置的温度不均匀性为0.3 ~ 2.0℃，面积效率至少是垂直配置的2倍。总体而言，横向配置具有较小的安装高度，较大的传热面积和均匀的温度分布。

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引用次数: 0

Modelling laminar flow in V-shaped filters integrated with catalyst technologies for atmospheric pollutant removal 结合催化剂技术的v型过滤器层流模拟用于大气污染物去除

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-03 DOI: 10.1016/j.ijheatmasstransfer.2025.128206

Samuel D. Tomlinson , Aliki M. Tsopelakou , Tzia Ming Onn , Steven R.H. Barrett , Adam M. Boies , Shaun Fitzgerald

Atmospheric pollution from particulate matter, volatile organic compounds and greenhouse gases is a critical environmental and public health issue, leading to respiratory diseases and climate change. A potential mitigation strategy involves utilising ventilation systems, which process large volumes of indoor and outdoor air and remove particulate pollutants through filtration. However, the integration of catalytic technologies with filters in ventilation systems remains underexplored, despite their potential to simultaneously remove particulate matter and gases, as seen in flue gas treatment and automotive exhaust systems. In this study, we develop a predictive, long-wave model for V-shaped filters, with and without separators. The model, validated against experimental and numerical data, provides a framework for enhancing flow rates by increasing fibre diameter and porosity while reducing aspect ratio and filter thickness. These changes lead to increased permeability, which lowers energy requirements. However, they also reduce the pollutant removal efficiency, highlighting the trade-off between flow, filtration performance and operational costs. Leveraging the long-wave model alongside experimental results, we estimate the maximum potential removal rate (

4.5 \times 1 0^{- 3}

GtPM_2.5,

6.4 \times 1 0^{- 3}

GtNO_x,

2.0 \times 1 0^{- 2}

GtCH₄ per year;

1.6 \times 1 0^{0}

GtCO₂e per year, 20-year GWP for CH₄) and minimum cost ($

3.4 \times 1 0^{3}

per tNO_x, $

1.1 \times 1 0^{3}

per tCH₄; $

1.3 \times 1 0^{1}

per tCO₂e) if a billion V-shaped filters integrated with catalytic enhancements were deployed in operation. These findings highlight the feasibility of catalytic filters as a scalable, high-efficiency solution for improving air quality and mitigating atmospheric pollution.

来自颗粒物、挥发性有机化合物和温室气体的大气污染是一个严重的环境和公共卫生问题，导致呼吸系统疾病和气候变化。一个潜在的缓解策略包括利用通风系统，它处理大量的室内和室外空气，并通过过滤去除颗粒污染物。然而，将催化技术与通风系统中的过滤器相结合的探索仍然不足，尽管它们有可能同时去除颗粒物质和气体，如在烟气处理和汽车排气系统中看到的那样。在这项研究中，我们开发了一个预测的v型过滤器长波模型，有和没有分离器。该模型通过实验和数值数据进行了验证，为通过增加纤维直径和孔隙度，同时减小长径比和过滤器厚度来提高流速提供了框架。这些变化导致渗透率增加，从而降低了能量需求。然而，它们也降低了污染物去除效率，突出了流量、过滤性能和运营成本之间的权衡。利用长波模型和实验结果，我们估计了如果投入使用10亿具催化增强功能的v形过滤器，最大潜在去除率（4.5×10 - 3 GtPM2.5, 6.4×10 - 3 GtNOx， 2.0×10 - 2 GtCH4 /年；1.6×100 GtCO2e /年，CH4的20年GWP）和最低成本（3.4×103 / tNOx, 1.1×103 / tCH4, 1.3×101 / tCO2e）。这些发现突出了催化过滤器作为一种可扩展的、高效的改善空气质量和减轻大气污染的解决方案的可行性。

{"title":"Modelling laminar flow in V-shaped filters integrated with catalyst technologies for atmospheric pollutant removal","authors":"Samuel D. Tomlinson , Aliki M. Tsopelakou , Tzia Ming Onn , Steven R.H. Barrett , Adam M. Boies , Shaun Fitzgerald","doi":"10.1016/j.ijheatmasstransfer.2025.128206","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.128206","url":null,"abstract":"<div><div>Atmospheric pollution from particulate matter, volatile organic compounds and greenhouse gases is a critical environmental and public health issue, leading to respiratory diseases and climate change. A potential mitigation strategy involves utilising ventilation systems, which process large volumes of indoor and outdoor air and remove particulate pollutants through filtration. However, the integration of catalytic technologies with filters in ventilation systems remains underexplored, despite their potential to simultaneously remove particulate matter and gases, as seen in flue gas treatment and automotive exhaust systems. In this study, we develop a predictive, long-wave model for V-shaped filters, with and without separators. The model, validated against experimental and numerical data, provides a framework for enhancing flow rates by increasing fibre diameter and porosity while reducing aspect ratio and filter thickness. These changes lead to increased permeability, which lowers energy requirements. However, they also reduce the pollutant removal efficiency, highlighting the trade-off between flow, filtration performance and operational costs. Leveraging the long-wave model alongside experimental results, we estimate the maximum potential removal rate (<span><math><mrow><mn>4</mn><mo>.</mo><mn>5</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span> GtPM<sub>2.5</sub>, <span><math><mrow><mn>6</mn><mo>.</mo><mn>4</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span> GtNO<sub>x</sub>, <span><math><mrow><mn>2</mn><mo>.</mo><mn>0</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span> GtCH<sub>4</sub> per year; <span><math><mrow><mn>1</mn><mo>.</mo><mn>6</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>0</mn></mrow></msup></mrow></math></span> GtCO<sub>2</sub>e per year, 20-year GWP for CH<sub>4</sub>) and minimum cost ($<span><math><mrow><mn>3</mn><mo>.</mo><mn>4</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> per tNO<sub>x</sub>, $<span><math><mrow><mn>1</mn><mo>.</mo><mn>1</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> per tCH<sub>4</sub>; $<span><math><mrow><mn>1</mn><mo>.</mo><mn>3</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>1</mn></mrow></msup></mrow></math></span> per tCO<sub>2</sub>e) if a billion V-shaped filters integrated with catalytic enhancements were deployed in operation. These findings highlight the feasibility of catalytic filters as a scalable, high-efficiency solution for improving air quality and mitigating atmospheric pollution.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"257 ","pages":"Article 128206"},"PeriodicalIF":5.8,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145683089","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 surface-based heat source model for thermomechanical simulation of additive friction stir deposition process 添加剂搅拌摩擦沉积过程热力学模拟的表面热源模型

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer

Pub Date : 2025-12-03 DOI: 10.1016/j.ijheatmasstransfer.2025.128204

Tahmidul Haque Ruvo , Apurba Sarker , Shuheng Liao , Sourav Saha

Additive friction stir deposition (AFSD) is a solid-state manufacturing technique that uses frictional heat to soften and plastically deform metal feedstock for layer-by-layer deposition. This work introduces a novel thermal model in which heat generated at the tool–feed rod interfaces is applied as a surface flux boundary condition rather than the conventional volumetric heat source. This formulation, grounded in the rich literature of friction stir welding, captures the underlying physics more faithfully and enables accurate prediction of thermal history. The thermal model is one-way coupled with an implicit elastoplastic model that uses combined hardening to compute residual stresses, and is implemented on GPU-accelerated high-performance computing platforms for large-scale simulations. Validation against experiments for thin-wall build shows excellent agreement in temperature and stress evolution. Parametric analyses on a 4-layer build made of AA2024 alloy reveal that peak temperature increases with rotational speed and applied pressure, while dwell time has minimal influence. Residual stresses depend on both process parameters and cooling history. The article further outlines possible extensions and future direction of this work. All code and data are released via GitHub to promote reproducibility and facilitate future AFSD process modeling.

添加剂搅拌摩擦沉积（AFSD）是一种固态制造技术，它利用摩擦热来软化和塑性变形金属原料，进行逐层沉积。这项工作引入了一种新的热模型，其中在刀具-进给杆界面产生的热量被用作表面通量边界条件，而不是传统的体积热源。这个公式，在丰富的文献摩擦搅拌焊接接地，捕捉潜在的物理更忠实，使热历史的准确预测。热模型是单向耦合的隐式弹塑性模型，使用组合硬化计算残余应力，并在gpu加速的高性能计算平台上实现大规模模拟。对薄壁结构的实验验证表明，温度和应力演化具有很好的一致性。对AA2024合金4层构件的参数分析表明，峰值温度随转速和施加压力的增加而增加，而停留时间对峰值温度的影响最小。残余应力取决于工艺参数和冷却历史。文章进一步概述了这项工作的可能扩展和未来方向。所有代码和数据都通过GitHub发布，以提高可重复性，并为未来的AFSD过程建模提供便利。

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引用次数: 0