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Hybrid lattice Boltzmann method for compressible flows at all Mach regimes 可压缩流的混合晶格玻尔兹曼方法
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2026.110649
Shaolong Guo , Chengming Wan , Yongliang Feng , Ziyi Xiong
Accurate and robust simulation of compressible flows across all speed regimes, particularly those involving strong discontinuities at high Mach numbers, remains a significant challenge for the lattice Boltzmann method (LBM). Hybrid recursive regularized lattice Boltzmann (HRR-LB) models provide a promising approach by coupling an LBM solver for density and momentum with a finite-volume method (FVM) for the energy equation. In this work, we present a new, easily implemented HRR-LB framework where the FVM solver for the total energy equation is fully colocated with the LBM solver. The enhanced robustness and accuracy of the proposed hybrid lattice Boltzmann method stem from two essential components: the recursive-regularized collision operator and a thermodynamically consistent hybrid coupling strategy. The performance of the proposed framework is systematically validated across eight challenging benchmarks, including high-Mach-number isentropic vortex convection, blast waves, and Mach 10 double-Mach reflection. The proposed hybrid lattice Boltzmann method demonstrates excellent stability and accuracy across a wide range of compressible-flow regimes, effectively overcoming the long-standing difficulty of applying standard nearest-neighbor streaming–collision LBM to high–Mach–number flows.
对于晶格玻尔兹曼方法(LBM)来说,准确而稳健地模拟所有速度范围内的可压缩流动,特别是那些在高马赫数下涉及强不连续的流动,仍然是一个重大挑战。混合递归正则晶格玻尔兹曼(HRR-LB)模型将密度和动量的LBM求解器与能量方程的有限体积方法(FVM)相结合,提供了一种很有前途的方法。在这项工作中,我们提出了一个新的,易于实现的HRR-LB框架,其中总能量方程的FVM解算器与LBM解算器完全重合。本文提出的混合晶格玻尔兹曼方法鲁棒性和精度的提高源于两个基本组成部分:递归正则化碰撞算子和热力学一致的混合耦合策略。该框架的性能在8个具有挑战性的基准测试中得到了系统验证,包括高马赫数等熵涡对流、冲击波和10马赫双马赫数反射。所提出的混合晶格玻尔兹曼方法在大范围的可压缩流型中表现出优异的稳定性和准确性,有效地克服了将标准最近邻流碰撞LBM应用于高马赫数流的长期困难。
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引用次数: 0
Alterations in swelling percentage, mechanical, and thermal characteristics of polyacrylamide hydrogel under varying Table initial pressures through molecular dynamics simulation 通过分子动力学模拟研究不同表初压力下聚丙烯酰胺水凝胶的溶胀率、力学和热特性的变化
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2026.110576
Kejun Zhu , Tong Lu , Xiaolin Gu , Yibin Wang , Xiong Liu , A. Rahimi
Despite extensive research on the swelling behavior and mechanical properties of hydrogels under various conditions, the nanoscale mechanisms linking initial pressure changes to both swelling dynamics and thermal transport properties have not been thoroughly investigated. Specifically, the influence of initial pressure on the structural, mechanical, and thermal characteristics of polyacrylamide-based hydrogels has not been comprehensively studied at the molecular level. This study aimed to fill this gap by utilizing molecular dynamics simulations to analyze how different initial pressures (0, 1, 2, and 5 bar) impact the swelling percentage, ultimate strength, Young's modulus, heat flux, and thermal conductivity of polyacrylamide hydrogels. Employing LAMMPS software, it was observed that increasing the initial pressure from 0 to 5 bar led to a reduction in the hydrogel's volume from 360,256 to 312,583 Å3, a decrease in thermal conductivity from 0.58 to 0.52 W/m·K, and an enhancement in mechanical strength and toughness, with ultimate strength increasing from 0.0305 MPa to 0.0396 MPa and toughness rising from 0.4108 to 0.4205. These results provide new insights into the interrelated mechanical and thermal behavior of hydrogels under pressure, thereby enhancing their potential applications across sectors such as petroleum, environmental protection, and beyond.
尽管人们对水凝胶在不同条件下的膨胀行为和力学性能进行了广泛的研究,但将初始压力变化与膨胀动力学和热输运性质联系起来的纳米尺度机制尚未得到深入研究。具体而言,初始压力对聚丙烯酰胺基水凝胶的结构、力学和热特性的影响尚未在分子水平上进行全面研究。本研究旨在通过分子动力学模拟来填补这一空白,分析不同初始压力(0、1、2和5 bar)对聚丙烯酰胺水凝胶的膨胀率、极限强度、杨氏模量、热流密度和导热系数的影响。利用LAMMPS软件观察到,将初始压力从0增加到5 bar,水凝胶体积从360,256减小到312,583 Å3,导热系数从0.58减小到0.52 W/m·K,机械强度和韧性均有所提高,极限强度从0.0305 MPa增加到0.0396 MPa,韧性从0.4108增加到0.4205。这些结果为水凝胶在压力下的相关力学和热行为提供了新的见解,从而增强了水凝胶在石油、环保等领域的潜在应用。
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引用次数: 0
Thermally reconfigurable VO2 grating metasurface for multifunctional infrared emission control 用于多功能红外发射控制的热可重构VO2光栅超表面
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2026.110653
Biyuan Wu , Xiqiao Huang , Daohong Yang , Shujuan Liu , Xiaohu Wu
Thermal emission is ubiquitous in nature and essential for applications including thermal management, thermophotovoltaics, infrared camouflage, and multispectral sensing. Realizing tunable control over the spectral, polarization, and angular characteristics of thermal emission is crucial for multifunctional and adaptive thermal photonic systems. Here, we propose a VO2-based grating metasurface emitter that enables polarization-selective, switchable emission bandwidths and directional control in the long-wave infrared (LWIR) region. In the metallic state of VO2, the emitter exhibits a broadband, wide-angle emission for both transverse electric (TE) and transverse magnetic (TM) polarizations. Upon transition to the insulating state, the emitter demonstrates a near-perfect, highly directional narrowband emission with a quality factor of 619 for TM polarization, whereas it remains low-emission (ε ≈ 0.06) for TE polarization. Besides, the electromagnetic field and power dissipation analyses reveal the underlying physical mechanisms. Specifically, the broadband high emission originates from the intrinsic loss of metallic VO2 together with the excitation of Fabry–Pérot cavity modes and surface plasmon-like hybrid modes, while narrowband emission arises from the magnetic polariton excitation in the insulating state. Furthermore, we investigate the influence of structural parameters on the performance of the emitter. The results show that the wavelength corresponding to the narrowband emission in the insulating state can be effectively tuned, while the broadband emission in the metallic state remains essentially unchanged. This work demonstrates a multifunctional grating metasurface emitter, providing a promising platform for tunable thermal radiation, infrared camouflage, and multispectral detection.
热发射在自然界中无处不在,对于热管理、热光伏、红外伪装和多光谱传感等应用至关重要。实现对热发射光谱、偏振和角度特性的可调控制是多功能和自适应热光子系统的关键。在这里,我们提出了一种基于vo2的光栅超表面发射器,它可以在长波红外(LWIR)区域实现偏振选择性,可切换的发射带宽和方向控制。在VO2的金属态下,发射器在横向电(TE)和横向磁(TM)极化下都表现出宽带、广角发射。在过渡到绝缘状态后,发射极表现出近乎完美的、高度定向的窄带发射,TM极化的质量因子为619,而TE极化的质量因子仍为低发射(ε≈0.06)。此外,电磁场和功耗分析揭示了其潜在的物理机制。其中,宽带高发射源于金属VO2的本征损耗以及法布里-帕姆罗特腔模式和表面类等离子体杂化模式的激发,窄带发射源于绝缘状态下的磁极化子激发。此外,我们还研究了结构参数对发射极性能的影响。结果表明,绝缘状态下窄带发射对应的波长可以有效调谐,而金属状态下的宽带发射基本保持不变。这项工作展示了一个多功能光栅超表面发射器,为可调谐热辐射、红外伪装和多光谱探测提供了一个有前途的平台。
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引用次数: 0
Investigations on thermal performance of lithium-ion cell with Fibonacci finned phase change material 斐波那契翅片相变材料对锂离子电池热性能的研究
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2026.110620
Sathyasree Nirmala , P.M. Sutheesh , Rohinikumar Bandaru
Effective thermal management is critical for lithium-ion (Li-ion) batteries in electric vehicles (EVs), particularly under high rate discharge conditions. This study presents a novel bio-inspired battery thermal management system (BTMS) integrating Fibonacci spiral-shaped fins with phase change material (PCM) to enhance heat dissipation. A three-dimensional numerical model is developed to evaluate the thermal performance of the proposed design under varying conditions. Comparative analysis is carried out against conventional straight-finned and finless configurations at discharge rates ranging from 1C to 5C, ambient temperatures from 300.15 K to 312.15 K, multiple PCM-fin material combinations, and fin counts from 2 to 6. Results show that the Fibonacci finned PCM BTMS significantly improves thermal regulation. The spiral geometry enhances heat conduction and promotes uniform melting, even with reduced PCM volume. Under 5C discharge and 306.15 K ambient, it limits the maximum cell temperature to 312.46 K and ensures a temperature difference below 1.86 K compared to 317.73 K and 6.37 K for the finless system. The copper fin and 1-tetradecanol PCM pairing delivers optimal thermal performance, while increasing fin count improves temperature uniformity but lowers latent heat capacity. PCM selection with a solidus temperature slightly below ambient improves phase change utilization. The proposed Fibonacci-finned BTMS, validated through experiments at the cell level, offers a promising solution for high-power battery packs. It establishes a foundation for scalable, bio-inspired thermal management strategies in EV applications under real-world operating conditions.
有效的热管理对于电动汽车中的锂离子(Li-ion)电池至关重要,特别是在高倍率放电条件下。本文提出了一种新型的生物电池热管理系统(BTMS),该系统将斐波那契螺旋形翅片与相变材料(PCM)相结合,以增强散热能力。建立了一个三维数值模型来评估该设计在不同条件下的热性能。在放电速率为1C ~ 5C、环境温度为300.15 ~ 312.15 K、多种pcm -鳍材料组合、鳍片数量为2 ~ 6的情况下,与传统的直鳍和无鳍配置进行了对比分析。结果表明,Fibonacci鳍状PCM BTMS显著改善了热调节。螺旋几何增强热传导和促进均匀熔化,即使减少PCM体积。在5C放电和306.15 K环境下,它将电池的最高温度限制在312.46 K,并确保与无翅片系统的317.73 K和6.37 K相比,温差低于1.86 K。铜翅片和1-十四醇PCM配对提供了最佳的热性能,而增加翅片数量改善了温度均匀性,但降低了潜热容量。选择固体温度略低于环境温度的PCM可以提高相变利用率。通过在电池水平上的实验验证,所提出的斐波那契鳍状BTMS为大功率电池组提供了一个有前途的解决方案。它为现实操作条件下电动汽车应用中可扩展的生物启发热管理策略奠定了基础。
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引用次数: 0
Thermal response and regulation mechanism of adaptive microchannels for electronic chips cooling under unsteady heat flux 非定常热流下电子芯片冷却自适应微通道的热响应及调节机制
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2026.110642
Liyuan Wang, Xiaoyu Diao, Wenfei Li, Ning Mao
The continuous advancement of electronic devices toward higher power densities and miniaturization poses increasing challenges for effective thermal management. Traditional microchannel heat sinks often lack the responsiveness required to handle rapid and localized thermal transients. In this study, an adaptive microchannel heat sink (A-MCHS) with thermally responsive pin-fins is proposed to enhance cooling performance under dynamic heat flux conditions. A coupled fluid–structure–thermal analysis is conducted using computational fluid dynamics (CFD), incorporating moving mesh techniques and user-defined functions to simulate the deformation of pin-fins in response to temperature rise. The thermal and flow performance of the A-MCHS is evaluated and compared with a conventional normal microchannel heat sink (N-MCHS) under varying heat flux levels, with specific attention to transient thermal events. Results show that the adaptive structure responds effectively to abrupt changes in heat flux by altering the internal flow distribution, enabling localized enhancement of convective heat transfer. At heat flux densities of 230 W/cm2 and 260 W/cm2, the A-MCHS reduced average surface temperatures by up to 2.75 K and improved the convective heat transfer coefficient and Nu by up to 9.91% and 10.10%, respectively. Additionally, the system exhibited faster response times and greater adaptability as the thermal load increased.
电子器件向高功率密度和小型化的不断发展,对有效的热管理提出了越来越大的挑战。传统的微通道散热器通常缺乏处理快速和局部热瞬变所需的响应性。在本研究中,提出了一种具有热响应鳍片的自适应微通道散热器(A-MCHS),以提高动态热流条件下的冷却性能。采用计算流体力学(CFD)方法,结合动网格技术和用户自定义函数,进行了流固热耦合分析,模拟了鳍片在温度升高时的变形。在不同的热通量水平下,对a - mchs的热性能和流动性能进行了评估,并与传统的普通微通道散热器(N-MCHS)进行了比较,特别关注了瞬态热事件。结果表明,自适应结构通过改变内部流动分布,有效地响应了热通量的突变,从而局部增强了对流换热。在热流密度为230 W/cm2和260 W/cm2时,A-MCHS使平均表面温度降低了2.75 K,对流换热系数和Nu分别提高了9.91%和10.10%。此外,随着热负荷的增加,系统表现出更快的响应时间和更强的适应性。
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引用次数: 0
Innovations in tubular solar still design: Optical, thermal, and material enhancements for superior desalination output 管式太阳能蒸馏器设计的创新:光学、热学和材料增强,用于卓越的脱盐输出
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2026.110565
Hasan A. Al-Asadi , Rassol Hamed Rasheed , Mariam E. Murad , Karrar A. Hammoodi , Saif Ali Kadhim , Ali M. Ashour , Waleed Muwafaq Al-Aloosi , Farhan Lafta Rashid
The tubular solar still (TSS) configuration presents an alternative technique for solar desalination by using elongated geometries which can lead to the increased capture of solar radiation and better heat management over conventional flat-basin setups. This arrangement minimizes reflection losses and leads to uniform irradiance distribution, making the implementation of engineering absorber structures and optical concentration techniques possible for much higher efficiency. Including PCMs within the basin represents a thermal mass, which could potentially sustain evaporation into night time and dampen storm-to-storm variability. The co-optimization of geometric parameters including the diameter, length and tilt angle of tubes has a simultaneous effect on optical and thermohydraulic performance. Meanwhile the choice of materials for glazing's and absorbers has an impact on energy generation efficiency, condensing efficiency and resistance to weathering. Recent advancements have come in the form of low-iron and anti-reflective glass, spectral-selective covers, wick-based systems for evaporation and ultra-shallow water films — all contributing to increased rate of evaporation and longer duration output. Long term durability afforded by anti-soiling and anti-scale coatings help capture the operational issues associated with fouling and scaling, preserving optical clarity and heat transfer over time. Performance evaluation techniques focus on thermal efficiency analysis and economic viewpoints such as the levelized cost of water and payback periods, which cover capital investment and yield increases. Connectivity to renewable sources such as solar and wind, can provide hybrid systems which enhance operations resilience and asset utilization. Based on the present results, future work emphasizes tubular multi-stage systems that recover the latent heat of condensation in a sequential evaporation-condensation process that seeks to maximize water yield with minimal mechanical complexity and maintenance. Taken together, these innovations make tubular solar stills flexible and low energy desalination systems that can be used in various environments that are affected by freshwater shortage.
管状太阳能蒸馏器(TSS)配置通过使用细长的几何形状提供了太阳能脱盐的替代技术,可以增加太阳辐射的捕获,并且比传统的平面盆地设置更好的热管理。这种安排最大限度地减少了反射损失,并导致均匀的辐照度分布,使工程吸收结构和光学集中技术的实施成为可能,以获得更高的效率。包括盆地内的pcm代表了一个热质量,它可能在夜间维持蒸发,并抑制风暴到风暴的变化。管的直径、长度和倾斜角度等几何参数的协同优化对光学和热液性能都有影响。同时,玻璃和吸收材料的选择对能源产生效率、冷凝效率和耐风化性都有影响。最近的进步体现在低铁和抗反射玻璃、光谱选择罩、基于灯芯的蒸发系统和超浅水薄膜等方面,所有这些都有助于提高蒸发速度和延长输出时间。防污和防垢涂层提供的长期耐用性有助于解决与污垢和结垢相关的操作问题,保持光学清晰度和长期传热。性能评估技术侧重于热效率分析和经济观点,如水的平准化成本和投资回收期,包括资本投资和收益增加。与太阳能和风能等可再生能源的连接可以提供混合系统,从而提高运营弹性和资产利用率。基于目前的研究结果,未来的工作将重点放在管状多级系统上,该系统可以在顺序蒸发-冷凝过程中回收冷凝潜热,从而以最小的机械复杂性和维护来最大化产水量。综上所述,这些创新使管式太阳能蒸馏器具有灵活性和低能耗的海水淡化系统,可用于受淡水短缺影响的各种环境。
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引用次数: 0
A comprehensive hydrothermal-economy-environmental analysis of flat solar heaters featuring a novel helically canaliculated absorber tube and windowed design turbulator 采用新型螺旋管和开窗设计紊流器的平板太阳能加热器的水热经济环境综合分析
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2025.110462
Sarminah Samad , Ali Alamry , Gabriel Garleanu , Delia Garleanu , Khaled S. AlQdah , Salman Saeidlou
Flat plate solar collectors provide a cost-effective solution for residential water heating due to their simple design and low production cost. However, their inherently low thermal efficiency limits wider adoption. To address this, the present study proposes a passive enhancement method combining a helically canaliculated flat absorber tube (HCFT) with a novel windowed ramp-shaped turbulator (WRST) to improve heat transfer performance. The design aims to disrupt the thermal boundary layer and promote turbulence, significantly enhancing thermal efficiency. A parametric analysis investigated the effects of channel depth (1–3 mm) and window area (0–56 mm2) on thermal-hydraulic behavior, economic characteristics, and CO₂ emission reduction. Results demonstrated a maximum Nusselt number enhancement of 4.53 times compared to a conventional circular tube, achieved at a 2 mm channel depth and zero window area. This configuration also delivered the lowest levelized cost of energy (0.122 $/kWh), shortest payback period (0.81 years), and highest CO₂ emission reduction (122.3 tons/lifetime), marking it as the optimal economic and environmental choice. From a hydrothermal perspective, the highest performance evaluation criterion (PEC = 1.82) was observed with a 2 mm channel depth and a 56 mm2 windowed WRST, illustrating the trade-off between heat transfer improvement and pressure drop.
平板太阳能集热器由于其设计简单,生产成本低,为住宅热水供暖提供了一种经济有效的解决方案。然而,其固有的低热效率限制了其更广泛的应用。为了解决这一问题,本研究提出了一种将螺旋管扁平吸收管(HCFT)与新型窗口坡道形湍流器(WRST)相结合的被动增强方法来提高传热性能。该设计旨在破坏热边界层,促进湍流,显著提高热效率。参数分析研究了通道深度(1-3 mm)和窗口面积(0-56 mm2)对热工性能、经济特性和CO₂减排的影响。结果表明,与传统圆管相比,在2 mm通道深度和零窗口面积下,最大努塞尔数增强了4.53倍。该配置还具有最低的能源成本(0.122美元/千瓦时)、最短的投资回收期(0.81年)和最高的二氧化碳减排(122.3吨/寿命),是经济和环境的最佳选择。从热液的角度来看,当通道深度为2 mm,窗口WRST为56 mm2时,获得了最高的性能评价标准(PEC = 1.82),说明了传热改善与压降之间的权衡。
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引用次数: 0
Interfacial thermal transport in the presence of gaps filled with an interstitial fluid 在充满间隙流体的间隙中存在的界面热传递
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-30 DOI: 10.1016/j.icheatmasstransfer.2025.110464
Ankur Jain
The problem of thermal contact resistance due to roughness-induced gaps between two mating materials has been well-studied through analytical modeling, numerical simulations as well as measurements. However, most of such theoretical past work completely neglects thermal conduction through the gaps and/or approximates the gaps to be circular in shape. This work presents derivation of thermal contact resistance between two mating materials due to arbitrarily-shaped interfacial gaps filled with a stationary fluid. The energy conservation equation is solved for a problem in which the spatial ditribution of thermal conductivity is represented by Heaviside functions. A series solution that accounts for the gap shape and thermal conductivity is derived for the temperature field and, therefore, the thermal contact resistance. Excellent agreement is demonstrated with past work for a simplified special case, and also with independent numerical simulations. Under certain conditions, thermal contact resistance is found to be a strong function of the gap thermal conductivity. The effect of contact fraction and gap shape on thermal contact resistance is analyzed. Thermal contact resistance is determined for non-circular gaps, including a gap with discretely defined shape, such as from a profilometer measurement. This work solves a very general form of the thermal contact resistance problem. Results may find applications in a variety of interface-dominated thermal transport problems.
通过分析建模、数值模拟和测量,对两种配合材料之间由粗糙度引起的间隙引起的热接触电阻问题进行了很好的研究。然而,大多数过去的理论工作完全忽略了通过间隙的热传导和/或将间隙近似为圆形。这项工作提出了两种配合材料之间的热接触电阻的推导,由于任意形状的界面间隙充满了固定流体。针对热导率空间分布用Heaviside函数表示的问题,求解了能量守恒方程。考虑间隙形状和热导率的一系列解决方案被导出为温度场,因此,热接触电阻。对于一种简化的特殊情况,与以往的工作结果以及独立的数值模拟结果非常吻合。在一定条件下,发现热接触电阻是间隙导热系数的强函数。分析了接触分数和间隙形状对接触热阻的影响。热接触电阻用于非圆形间隙,包括具有离散定义形状的间隙,例如来自轮廓仪的测量。这项工作解决了热接触电阻问题的一种非常普遍的形式。结果可以在各种界面主导的热传输问题中找到应用。
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引用次数: 0
Insight into the leakage-phase change- diffusion characteristics from a small hole in buried liquid ammonia pipelines based on soil porous media modeling: A numerical study 基于土壤多孔介质模型的埋地液氨管道小孔泄漏相变扩散特性研究
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-29 DOI: 10.1016/j.icheatmasstransfer.2026.110630
Fang Rao , Changjun Li , Caigong Zhang , Donghao Yang , Chao Chen
As a critical hydrogen carrier, ammonia is gaining increasing attention in the global energy transition and is primarily transported by pipeline in liquid form. If a leak occurs during pipeline operation, liquid ammonia will rapidly flash-vaporize as atmospheric pressure is considerably lower than the operating pressure, leading to a decrease in ambient temperature. The vaporized ammonia first permeates through the soil before overcoming surface resistance to diffuse into the air. This process not only endangers the safety of liquid ammonia transportation but also imposes severe environmental hazards. However, current research mainly focuses on the leakage and diffusion characteristics of liquid ammonia in air. Until now, the characteristics of liquid ammonia leakage, the phase change of liquid ammonia in porous soil, and the coupled diffusion in soil and air remain poorly understood. In this work, we develop a CFD model based on the Eulerian model, the porous media model, the Lee model, and the species transport model to reveal the leakage-phase change-diffusion characteristics. We comprehensively investigate the distribution of volume fraction, temperature, and pressure under pipeline operating pressure of 3.5 MPa, ambient temperature of 293.15 K, and a leak hole of 30 mm. Moreover, we discuss the effects of soil properties, wind speed, and ambient temperature on the leakage-phase change-diffusion characteristics. The results indicate that three distinct regions are formed after the liquid ammonia leakage: a liquid region near the leakage source, a transitional vaporization region in the soil, and a dense gas cloud dispersion region in the air. Temperature evolution involves an initial flash evaporation-dominated stage, followed by a dynamic equilibrium stage. Soil resistance is negatively correlated with both the diffusion rate into the air and the temperature drop rate. The wind speed mainly affects the diffusion pattern of vapor ammonia in the air. The minimum temperatures under different ambient temperatures eventually stabilize at similar steady-state values.
氨作为一种重要的氢载体,在全球能源转型中越来越受到重视,主要以液态形式通过管道输送。如果在管道运行过程中发生泄漏,由于大气压力大大低于运行压力,液氨会迅速闪蒸,导致环境温度下降。蒸发的氨首先渗透到土壤中,然后克服表面阻力扩散到空气中。这一过程不仅危及液氨运输安全,而且造成严重的环境危害。然而,目前的研究主要集中在液氨在空气中的泄漏和扩散特性。迄今为止,人们对液氨泄漏特性、液氨在多孔土壤中的相变以及液氨在土壤和空气中的耦合扩散仍知之甚少。本文建立了基于欧拉模型、多孔介质模型、Lee模型和物质输运模型的CFD模型来揭示泄漏-相变-扩散特性。综合考察了管道工作压力为3.5 MPa、环境温度为293.15 K、泄漏孔为30 mm时的体积分数、温度和压力分布。此外,我们还讨论了土壤性质、风速和环境温度对泄漏-相变-扩散特性的影响。结果表明,液氨泄漏后形成了三个不同的区域:泄漏源附近的液体区、土壤中的过渡汽化区和空气中的密集气云分散区。温度演化包括一个以闪蒸为主的初始阶段,随后是一个动态平衡阶段。土壤阻力与空气扩散速率和温度下降速率均呈负相关。风速主要影响水蒸气氨在空气中的扩散方式。不同环境温度下的最低温度最终稳定在相似的稳态值。
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引用次数: 0
Study on explosion overpressure and flame propagation characteristics of micrometer-level aluminum powder with different particle size in large-scale pipeline 微米级不同粒径铝粉在大型管道中的爆炸超压及火焰传播特性研究
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-29 DOI: 10.1016/j.icheatmasstransfer.2026.110656
Niu Yihui , Jiang Lingui , Wang Lei , He Sha , Liao Feilong , Mi Hongfu
To investigate the explosion propagation characteristics of aluminum powder in dust removal pipelines, a large-diameter horizontal pipeline explosion experimental system measuring 20 m in length with a diameter of 180 mm was constructed. The propagation characteristics of overpressure and flame following a methane explosion, which triggered an aluminum powder explosion, were analyzed under varying micrometer-level aluminum powder particle sizes. Results show that the peak overpressure and flame propagation speed rise initially and then decline as the propagation distance increases. In the case of aluminum powder with particle sizes ranging from 12 μm to 30 μm, as particle size decreases, the peak overpressure, flame propagation speed, and overpressure attenuation velocity increase, whereas the flame attenuation velocity decreases. Compared with aluminum powder having a particle size of 12 μm, the 6 μm aluminum powder exhibits lower explosion peak overpressure, flame propagation speed, and overpressure attenuation velocity, but a higher flame attenuation velocity. The flame propagation speed in the explosion can reach up to 357.12 m/s. The positive feedback relationship between the overpressure and flame in aluminum powder explosions leads to the synergistic increase or decrease in peak overpressure and flame propagation speed. These findings contribute to reducing industrial dust explosion accidents.
为研究铝粉在除尘管道中的爆炸传播特性,搭建了长20 m、直径180 mm的大直径卧式管道爆炸实验系统。分析了不同微米级铝粉粒径下甲烷爆炸引发铝粉爆炸后的超压和火焰传播特性。结果表明:随着传播距离的增加,峰值超压和火焰传播速度呈先上升后下降的趋势;对于粒径为12 μm ~ 30 μm的铝粉,随着粒径的减小,峰值超压、火焰传播速度和超压衰减速度增大,火焰衰减速度减小。与粒径为12 μm的铝粉相比,6 μm铝粉的爆炸峰值超压、火焰传播速度和超压衰减速度均较低,但火焰衰减速度较高。爆炸中火焰传播速度可达357.12 m/s。铝粉爆炸中超压与火焰的正反馈关系导致峰值超压与火焰传播速度协同增减。这些发现有助于减少工业粉尘爆炸事故。
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International Communications in Heat and Mass Transfer
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