Physics Open最新文献_第6页

Bifurcation analysis and new waveforms and dynamical behaviors of the modified regularized long-wave equation 修正正则长波方程的分岔分析及新波形和动力学行为

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-10-23 DOI: 10.1016/j.physo.2025.100340

Attia Rani , Samia Munir , Muhammad Sohail , Salah Knani

The present article examines the modified regularized long-wave equation. The Sardar sub-equation approach is employed to conduct the investigation. Periodic, kink, and solitary solitons are among the many exact solutions that are obtained. Numerous physical structures found in analytical solutions are visually examined to show how they change dynamically in 3D, 2D and contour plots. The accuracy of the obtained findings is further validated by substituting the solutions into the governing equation using Maple software. The Galilean transformation is applied to derive the dynamical system of the proposed equation. The aforementioned model is then analyzed for bifurcation, chaotic, and sensitivity behaviors based on the principles of planar dynamical systems. The dynamics of the model exhibit periodic, quasi-periodic, and chaotic motions. The results demonstrate the effectiveness, efficiency, and simplicity of the integration methods used, suggesting that these methods can also be applied to investigate more complex nonlinear models in modern scientific and engineering applications. The originality of this study lies in its comprehensive analysis of the governmental model, revealing its intricate dynamics and diverse wave structures. Through the combination of bifurcation analysis, chaotic behavior, stability analysis, and waveform characteristics, this study also contributes to our understanding of nonlinear wave properties in shallow water.

本文研究了修正的正则化长波方程。采用Sardar子方程方法进行研究。周期孤子、扭结孤子和孤孤子是得到的许多精确解之一。在分析解决方案中发现的许多物理结构都进行了视觉检查，以显示它们如何在3D， 2D和等高线图中动态变化。通过使用Maple软件将解代入控制方程，进一步验证了所得结果的准确性。应用伽利略变换推导了所提方程的动力系统。基于平面动力系统原理，分析了该模型的分岔、混沌和灵敏度行为。模型的动力学表现为周期、准周期和混沌运动。结果证明了所采用的积分方法的有效性、效率和简单性，表明这些方法也可以应用于现代科学和工程应用中更复杂的非线性模型的研究。本研究的独创性在于对政府模型进行了全面的分析，揭示了其复杂的动力学和多样的波动结构。通过分岔分析、混沌行为、稳定性分析和波形特征的结合，本研究也有助于我们对浅水非线性波特性的理解。

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引用次数: 0

Enhanced leak detection in water distribution systems using GFCC-based signal processing techniques 利用基于gfcc的信号处理技术增强配水系统的泄漏检测

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-09-10 DOI: 10.1016/j.physo.2025.100324

Mohd Fairusham Ghazali , Nor Azinee Said , Muhammad Aminuddin Pi Remli , Erdiwansyah , Muhammad Hanafi Yusop , Rizalman Mamat

Leak detection in water distribution systems remains a significant challenge, especially for small-scale leaks masked by noise. This study proposes an advanced signal processing approach using Gammatone Frequency Cepstral Coefficients (GFCC) combined with a squeezing technique to enhance the detection of weak leak signals. Experiments were conducted using a 152-m MDPE pipeline under two water pressure levels (1 bar and 2 bar) and five leak sizes (1 mm–5 mm). The proposed method detected leak signals at low signal-to-noise ratio (SNR) levels as low as 95 dB, where conventional methods typically fail to do so. Specifically, the squeezing technique effectively amplified transient leak signals, enabling accurate identification of leak-induced spikes within high-noise environments. The analysis revealed a significant improvement in detection, with leak signals becoming distinguishable even under severe masking conditions. The proposed GFCC-based technique achieved consistent detection across 30 repeated datasets, validating its robustness and repeatability. The novelty of this study lies in integrating GFCC and squeezing, which were initially used in speech signal processing, into transient-based leak detection in pipelines, an area that has not been widely explored. This hybrid technique presents a promising solution for reliable and high-sensitivity leak detection in modern water distribution networks.

供水系统的泄漏检测仍然是一个重大挑战，特别是对于被噪音掩盖的小规模泄漏。本研究提出了一种利用伽玛酮频率倒谱系数（GFCC）与压缩技术相结合的先进信号处理方法，以增强对弱泄漏信号的检测。实验采用152 m MDPE管道，在2种水压水平（1 bar和2 bar）和5种泄漏尺寸（1 mm - 5 mm）下进行。该方法在低信噪比（SNR）水平（低至95 dB）下检测泄漏信号，而传统方法通常无法做到这一点。具体来说，压缩技术有效地放大了瞬态泄漏信号，从而能够在高噪声环境中准确识别泄漏引起的峰值。分析表明，在检测方面有了显著的改进，即使在严重的掩蔽条件下，泄漏信号也能被识别出来。提出的基于gfcc的技术在30个重复数据集上实现了一致的检测，验证了其鲁棒性和可重复性。本研究的新颖之处在于将最初用于语音信号处理的GFCC和压缩技术整合到基于瞬态的管道泄漏检测中，这是一个尚未被广泛探索的领域。这种混合技术为现代配水管网可靠、高灵敏度的泄漏检测提供了一种很有前景的解决方案。

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引用次数: 0

Enhancing traffic capacity of scale free networks by changing queuing strategy 通过改变排队策略提高无标度网络的通行能力

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-09-12 DOI: 10.1016/j.physo.2025.100322

Lingkang Kong, Jian Liu, Xinjian Chu

In this paper, we propose a new queuing strategy, which called multi-channel strategy, to improve traffic capacity. The multi-channel strategy is proposed according to the degree of the node. Compared with the previous strategy, single-channel strategy, in which each node has only one waiting queue so that packets can only transmit according to the order of packet queuing per unit time, the multi-channel strategy adjusts the number of waiting queue that each node has, that is, the number of waiting queue of each node is set according to the maximum amount of packets, the degree, that each node can handle per unit time. The pros and cons of the strategies can be compared by two indicators, one is traffic capacity improving, other one is traffic load. Lots of experimental simulations are conducted. In terms of improve traffic capacity, the multi-channel strategy is about 170% times that of the single-channel strategy. In terms of traffic load, the multi-channel strategy is more evenly distributed than the single-channel strategy. According to the experimental results, the multi-channel strategy is superior to the single-channel strategy.

本文提出了一种新的排队策略，称为多通道策略，以提高交通容量。根据节点的度，提出了多渠道策略。与之前的单通道策略相比，单通道策略中每个节点只有一个等待队列，数据包只能按照单位时间内数据包排队的顺序进行传输，而多通道策略则调整每个节点的等待队列数量，即每个节点在单位时间内可以处理的最大数据包数量，即程度来设置每个节点的等待队列数量。两种策略的优缺点可以通过两个指标来比较，一是交通能力的提高，另一个是交通负荷。进行了大量的实验模拟。在提高通行能力方面，多渠道策略是单渠道策略的170%左右。在流量负载方面，多通道策略比单通道策略分布更均匀。实验结果表明，多通道策略优于单通道策略。

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引用次数: 0

Adjustable acoustic labyrinthine metamaterials for multiband noise absorption 用于多波段噪声吸收的可调声学迷宫超材料

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-10-30 DOI: 10.1016/j.physo.2025.100342

Abas Dalvand, Reza Hedayati, Ali Asghar Jafari

Acoustic metamaterials offer promising solutions for mitigating noise pollution, but addressing noise sources that vary in frequqncy remains challenging. This study introduces an Adjustable Acoustic Labyrinthine Metamaterial (AALM), with a fixed thickness of 60 mm, designed for tunable, multiband sound absorption within the critical 100–2000 Hz frequency range. The AALM's acoustic properties are tuned via two mechanisms. The primary control involves changing the number of coiled-up spaces; as the number of channels is increased, the effective sound path lengthens, causing a significant decrease in the peak absorption frequency while also increasing the absorption coefficient. Second, fine-tuning and impedance matching are achieved by adjusting the cross-sectional area of the wave entrance: decreasing the opening size slightly reduces the absorption frequency but increases the peak absorption coefficient. Numerical simulations (FEM) and experimental impedance tube measurements validate the design. The AALM, configurable into 24 distinct modes, achieves near-perfect sound absorption (α ~ 1) at targeted frequencies across a wide spectrum from 220 Hz to 1750 Hz. Altering the coiled spaces enables major frequency adjustments (≈120–530 Hz shifts), while modifying the entrance area allows for finer tuning (≈10–50 Hz shifts). This adaptable design surpasses the limitations of conventional passive absorbers and shows significant potential for integration into smart systems capable of real-time noise adaptation.

声学超材料为减轻噪声污染提供了有前途的解决方案，但解决不同频率的噪声源仍然具有挑战性。本研究介绍了一种可调声学迷宫超材料（AALM），其厚度为60 mm，可在100-2000 Hz的临界频率范围内进行可调的多波段吸声。AALM的声学特性通过两种机制进行调节。主要控制包括改变盘绕空间的数量；随着通道数的增加，有效声路延长，导致峰值吸收频率显著降低，同时吸收系数也增加。其次，通过调节波入口横截面积实现微调和阻抗匹配：减小开孔尺寸会略微降低吸收频率，但会增加峰值吸收系数。数值模拟和阻抗管实验验证了设计的正确性。AALM可配置为24种不同的模式，在220 Hz至1750 Hz的宽频谱范围内的目标频率上实现近乎完美的吸声（α ~ 1）。改变线圈空间可以实现主要的频率调整（≈120-530赫兹的位移），而修改入口区域允许更精细的调谐（≈10-50赫兹的位移）。这种适应性强的设计超越了传统被动吸收器的局限性，并显示出集成到能够实时适应噪声的智能系统中的巨大潜力。

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引用次数: 0

Computational insights into the optoelectronic and thermoelectric properties of cubic LaScO3 under pressure-induced bandgap transition 压力诱导带隙跃迁下立方LaScO3的光电和热电性质的计算见解

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-09-02 DOI: 10.1016/j.physo.2025.100320

Zoha Afzal , Sajid Butt , Nimra Naeem , Muhammad Irfan , Muhammad Rizwan , Muhammad Usman , Farhan Mudasar

Using density functional theory, we explore the pressure-induced transformation of LaScO₃ perovskite highlighting its potential for optoelectronic and thermoelectric applications. Our calculations reveal a stable cubic structure that undergoes a widening and transition of bandgap from an indirect to a direct with increasing pressure. Optical properties like conductivity, refractive index, absorption and dielectric function are calculated at various pressures ranging from 0 GPa to 12 GPa with a step size of 4 GPa. Thermoelectric performance was assessed at 300–1300 K using BoltzTraP code. A peak power factor of 2.22 × 10⁷ W/m·K² was observed at 4 GPa while the figure of merit attained a maximum value of 0.75 at 12 GPa. This study demonstrates that LaScO₃ under pressures exhibits remarkable thermoelectric properties making it a prime candidate for highly efficient energy conversion devices.

利用密度泛函理论，我们探索了LaScO3钙钛矿的压力诱导转化，突出了其在光电和热电应用方面的潜力。我们的计算揭示了一个稳定的立方结构，它经历了从间接带隙到直接带隙的加宽和转变。在0 ~ 12 GPa的不同压力下，计算了电导率、折射率、吸收和介电函数等光学性质，步长为4 GPa。使用BoltzTraP代码在300-1300 K下评估热电性能。在4 GPa时，峰值功率因数为2.22 × 107 W/m·K2，而在12 GPa时，优点系数达到最大值0.75。这项研究表明，在压力下LaScO3表现出显著的热电特性，使其成为高效能量转换装置的主要候选者。

引用次数: 0

Photoionization and photoabsorption study of Ne-like Mg2+, Al3+ and Si4+ ions using the relativistic configuration interaction method 用相对论组态相互作用方法研究类ne Mg2+， Al3+和Si4+离子的光电离和光吸收

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-08-22 DOI: 10.1016/j.physo.2025.100317

G.A. Alna'washi , O. Abu-Haija , S.M. Hamasha

This paper presents comprehensive calculations of resonance energies for photoabsorption and photoionization of Ne-like Mg²⁺, Al³⁺ and Si⁴⁺ ions. We report ionization threshold limits, resonance energies, wavelengths, transition rates, and oscillator strengths for 1s² 2s 2p⁶ (²S_1/2) np (¹P₁), 1s 2s² 2p⁶ (²S_1/2) np (¹P₁), 2s² 2p⁵ (²P) ns, and 2s² 2p⁵ (²P) nd Rydberg series. All the calculations were performed using the relativistic configuration interaction (RCI) method within the Flexible Atomic Code (FAC). The RCI results show very good agreement with existing theoretical and experimental values reported in literature. Moreover, we present new tabulations of K-shell photoexcitation for Mg²⁺, Al³⁺ and Si⁴⁺ ions, as well as unreported outer-shell resonance features to highly excited states. This provides an improved description of the photoabsorption spectrum, which are important for high-precision spectral modeling in astrophysical plasmas.

本文综合计算了类ne Mg2+、Al3+和Si4+离子的光吸收和光电离共振能。我们报道了1s2 2s 2p6 (2S1/2) np （1P1）、1s 2s2 2p6 (2S1/2) np （1P1）、2s2 2p5 (2P) ns、2s2 2p5 （2P）和Rydberg系列的电离阈值、共振能量、波长、跃迁速率和振荡器强度。所有计算均使用柔性原子代码（FAC）中的相对论组态相互作用（RCI）方法进行。RCI结果与现有文献报道的理论和实验值非常吻合。此外，我们提出了Mg2+， Al3+和Si4+离子的k壳光激发的新表格，以及未报道的高激发态的外壳共振特征。这为天体物理等离子体的高精度光谱建模提供了一种改进的光吸收光谱描述方法。

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引用次数: 0

Error analysis of polarization imaging system based on Mueller matrix 基于Mueller矩阵的偏振成像系统误差分析

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-10-10 DOI: 10.1016/j.physo.2025.100334

Juncai He, Tingyu Yan, Yi Chen

This study investigates the influence mechanisms of achromatic and non-achromatic properties on polarization detection errors in polarization imaging technology. Its primary objective is to quantitatively analyze how retarder thickness, retarder material, and Stokes vector parameters affect polarization imaging accuracy. Additionally, this study examines polarization detection errors stemming from retarder design and their influence on detection accuracy within polarization imaging systems based on Mueller matrix modulation. By varying parameters including the thickness and material of the retarder, as well as Stokes vector parameters, this study investigates the discrepancy between the Stokes vector in the non-achromatic scenario and that reconstructed using achromatic methods. Simulation results revealed that the error curves of S0 and S2, plotted against retarder thickness for both achromatic and non-achromatic scenarios, exhibit low sensitivity to thickness variations. Specifically, when the thickness changes, their error values remain nearly constant, showing an almost flat trend. In contrast, S1 and S3 errors are more sensitive to thickness fluctuations, with noticeable variations occurring at certain specific thicknesses. The peaks in these error curves arise because, at these critical thicknesses, the cosine of the phase delay for S1 approaches 0, while the sine of the phase delay for S3 approaches 0, both of which lead to larger errors. Based on these findings, it is concluded that within specific thickness ranges, non-achromatic retarders may serve as a viable alternative to achromatic ones under the experimental angle combinations examined.

研究了偏振成像技术中消色差和非消色差特性对偏振检测误差的影响机理。其主要目的是定量分析缓速器厚度、缓速器材料和斯托克斯矢量参数对偏振成像精度的影响。此外，本研究还探讨了由缓速器设计引起的偏振检测误差及其对基于穆勒矩阵调制的偏振成像系统检测精度的影响。通过改变缓速器的厚度和材料等参数，以及Stokes矢量参数，研究了非消色差情况下Stokes矢量与用消色差方法重建的Stokes矢量之间的差异。仿真结果表明，在消色差和非消色差两种情况下，S0和S2的误差曲线对厚度变化的敏感性较低。具体而言，当厚度变化时，它们的误差值几乎保持不变，呈现出几乎平坦的趋势。相比之下，S1和S3误差对厚度波动更为敏感，在某些特定厚度下会出现明显的变化。这些误差曲线的峰值出现是因为，在这些临界厚度处，S1的相位延迟的余弦值接近于0，而S3的相位延迟的正弦值接近于0，两者都会导致更大的误差。基于这些发现，得出结论，在特定的厚度范围内，在实验角度组合下，非消色差缓滞剂可以作为消色差缓滞剂的可行替代方案。

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引用次数: 0

Investigation of structural, electrical, and magnetic anisotropy studies of the rare earth (Tb3+) ion substituted Mg-Ni nanocrystalline ferrites for spintronic applications 自旋电子应用中稀土（Tb3+）离子取代Mg-Ni纳米晶铁氧体的结构、电学和磁各向异性研究

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-08-08 DOI: 10.1016/j.physo.2025.100308

Jettiboyina Anjaneyulu , K.V. Ramesh , D. Venkatesh , Bimaleswar Sahu

Tb³⁺ ion-doped Mg-Ni nanocrystalline ferrites with the chemical formula Mg_0.2Ni_0.8Tb_xFe_2-xO₄ (x = 0.00 to 0.25) were synthesized using the sol-gel auto-combustion method. The structural properties of all samples were analyzed using X-ray diffraction, FTIR, and UV–visible spectroscopy. XRD studies confirmed the existence of a secondary phase in samples with x = 0.15 to higher concentrations. The lattice constant decreased, and the X-ray density increased with increasing Tb³⁺ ions. The two prominent absorption bands observed in the FTIR spectra confirmed the spinel structure. The direct band gap obtained from the UV–vis investigation was in the range of 1.85–1.67 eV, confirming semiconducting behavior. The grain size calculated using FESEM increased with increasing Tb³⁺ concentration. DC electrical conductivity measurements also indicated the semiconducting characteristics of the samples. Magnetic measurements were performed using VSM. The addition of Tb³⁺ ions resulted in a decrease in the saturation magnetization from 29.32 (x = 0.00) to 8.61 (x = 0.25) emu/g. In addition, the anisotropy constant and anisotropy field decreased with increasing Tb³⁺ ion content because of secondary phase formation. Tunable magnetic softening, semiconducting nature, and anisotropy control are essential for tailoring materials for spintronic applications.

采用溶胶-凝胶自燃烧法合成了化学式为Mg0.2Ni0.8TbxFe2-xO4 （x = 0.00 ~ 0.25）的Tb3+离子掺杂Mg-Ni纳米晶铁氧体。用x射线衍射、红外光谱和紫外可见光谱分析了所有样品的结构特性。XRD研究证实，在x = 0.15至更高浓度的样品中存在二次相。随着Tb3+离子的增加，晶格常数减小，x射线密度增大。在FTIR光谱中观察到的两个突出的吸收带证实了尖晶石结构。紫外-可见研究得到的直接带隙在1.85-1.67 eV范围内，证实了半导体行为。FESEM计算的晶粒尺寸随着Tb3+浓度的增加而增大。直流电导率测量也表明了样品的半导体特性。磁测量采用VSM进行。Tb3+离子的加入使饱和磁化强度从29.32 （x = 0.00）降低到8.61 (x = 0.25) emu/g。此外，各向异性常数和各向异性场均随着Tb3+离子含量的增加而减小。可调磁软化，半导体性质和各向异性控制是必不可少的裁剪材料自旋电子应用。

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引用次数: 0

The role of Mn2+ ions on structural, morphological, optical, electrochemical and antibacterial properties of Zn0.9Sn0.1S nanoparticles Mn2+离子对Zn0.9Sn0.1S纳米粒子结构、形貌、光学、电化学和抗菌性能的影响

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-11-08 DOI: 10.1016/j.physo.2025.100346

A. Krishnamoorthy , I. Devadoss , Pandurengan Sakthivel , V.M. Suntharavel Muthaiah , A. Muthukrishnaraj , R. Selvam

A straightforward and economical co-precipitation technique was used to synthesize Zn_0.9-xSn_0.1Mn_xS (x = 0.01, 0.03, 0.05) nanoparticles (NPs). By varying the Mn²⁺ concentrations in the reaction solution, the structural, electrochemical, optical properties and antibacterial activity of Zn_0.9-xSn_0.1Mn_xS NPs were investigated. X-ray diffraction (XRD) analysis confirmed the formation of a cubic crystal structure, with the crystallite size showing a strong dependence on Mn²⁺ incorporation. The Scherer's method revealed that the crystallite size increased from 1.92 nm to 2.42 nm when the Mn²⁺ doping percentage increased. The optical bandgap (E_g) decreased from 4.028 eV to 3.837 eV for the increase of Mn dopant. Electrochemical analysis revealed that the specific capacitance of pure Zn_0.9Sn_0.1S NPs was 159.30 mF g⁻¹ at a scan rate of 80 mV s⁻¹. Upon Mn²⁺ incorporation, the capacitance initially decreased to 111.09 mF g⁻¹ at 1 % doping but increased markedly to 227.47 mF g⁻¹ and 246.71 mF g⁻¹ at 3 % and 5 % Mn²⁺ respectively. Photoluminescence (PL) spectra exhibited a prominent emission peak at 610 nm, with the PL intensity maximized at 1 % Mn²⁺ doping and quenched at higher concentrations. Antibacterial activity improved remarkably, with inhibition zones against E. coli (1.2–1.9 mm) and Streptococcus pneumoniae (1.5–2.3 mm). Mn²⁺-doped Zn₀.₉Sn₀.₁S NPs exhibited enhanced optical and antibacterial activity, with the optimum performance observed at 3 % Mn²⁺ doping.

采用简单经济的共沉淀法合成了Zn0.9-xSn0.1MnxS （x = 0.01, 0.03, 0.05）纳米粒子（NPs）。通过改变反应溶液中Mn2+的浓度，研究了Zn0.9-xSn0.1MnxS NPs的结构、电化学、光学性能和抗菌活性。x射线衍射（XRD）分析证实其形成立方晶体结构，晶粒尺寸与Mn2+掺入有很强的依赖性。Scherer's方法表明，随着Mn2+掺杂比例的增加，晶体尺寸从1.92 nm增加到2.42 nm。随着Mn掺杂量的增加，光学带隙（Eg）从4.028 eV减小到3.837 eV。电化学分析表明，在扫描速率为80 mV s−1时，纯Zn0.9Sn0.1S NPs的比电容为159.30 mF g−1。当掺杂Mn2+时，电容在掺杂率为1%时下降到111.09 mF g−1，而在掺杂率为3%和5%时，电容分别显著增加到227.47 mF g−1和246.71 mF g−1。光致发光（PL）光谱在610 nm处有一个突出的发射峰，在Mn2+掺杂浓度为1%时发光强度最大，在Mn2+掺杂浓度较高时发光强度被猝灭。抑菌活性明显提高，对大肠杆菌（1.2 ~ 1.9 mm）和肺炎链球菌（1.5 ~ 2.3 mm）均有抑菌带。Mn2+掺杂的Zn0.9Sn0.1S纳米粒子具有较强的光学和抗菌活性，其中以3% Mn2+掺杂的纳米粒子性能最佳。

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引用次数: 0

Investigation of time-dependent MHD flow characteristics of Williamson nanofluid across a heated, permeable and inclined stretching sheet within a porous medium Williamson纳米流体在多孔介质中加热、渗透和倾斜拉伸片上的MHD随时间流动特性研究

IF 1.4 Q2 Physics and Astronomy

Physics Open

Pub Date : 2025-12-01 Epub Date: 2025-11-14 DOI: 10.1016/j.physo.2025.100349

Berihun Gizachew , Hunegnaw Dessie , Eshetu Haile , Tadesse Walelign

In this work, the unsteady magnetohydrodynamic (MHD) flow of a Williamson nanofluid via a heated, inclined stretching sheet that is permeable and imbedded in a porous media is examined. The present model includes simultaneously buoyancy forces, Joule heating, Dufour-Soret cross-diffusion, heat generation/absorption, an obliquely applied magnetic field and viscous dissipation. The governing nonlinear partial differential equations for momentum, energy and concentration are transformed into a system of coupled ordinary differential equations using similarity variables. For a semi-analytical analysis of this system, the robust Homotopy Analysis Method (HAM) is used in the Mathematica environment. Due to heightened Lorentz resistance, parametric investigation shows that raising the magnetic field inclination from 30° to 60° lowers the primary flow velocity by an estimated 8–19 %. The effect of species-driven energy diffusion is highlighted by the temperature distribution increasing by about 17 % as the Dufour number grows from 0.2 to 0.6. A significant thermo-diffusive mass transfer is demonstrated by the concentration profile escalating by over 25 % as the Soret effect increases from 0.1 to 0.5. On the other hand, the local Nusselt number is boosted by about 60 % when the Prandtl number is raised from 1.0 to 3.0, which greatly improves wall heat transfer. These revelations offer a useful theoretical foundation for maximizing transport efficiency in advanced heat control and material processing systems with porous and inclined configurations employed within intricate multi-physical situations.

在这项工作中，研究了Williamson纳米流体通过加热的、倾斜的可渗透拉伸片并嵌入多孔介质中的非定常磁流体动力学（MHD）流动。该模型同时包括浮力、焦耳加热、dufoursoret交叉扩散、热产生/吸收、斜施加磁场和粘性耗散。将控制动量、能量和浓度的非线性偏微分方程转化为使用相似变量的耦合常微分方程系统。在Mathematica环境下，采用鲁棒同伦分析法对该系统进行了半解析分析。由于洛伦兹阻力的增加，参数研究表明，将磁场倾角从30°提高到60°，估计会使初级流速度降低8 - 19%。当Dufour数从0.2增加到0.6时，温度分布增加了约17%。当Soret效应从0.1增加到0.5时，浓度曲线上升了25%以上，证明了显著的热扩散传质。另一方面，当普朗特数从1.0提高到3.0时，局部努塞尔数提高了约60%，极大地改善了壁面换热。这些发现为在复杂的多物理环境中采用多孔和倾斜结构的先进热控制和材料处理系统中最大限度地提高传输效率提供了有用的理论基础。

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引用次数: 0