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Investigation on the mechanical and tribological behavior of tungsten-reinforced Ti-5Al-2.5Sn composites 钨增强 Ti-5Al-2.5Sn 复合材料的机械和摩擦学行为研究
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-30 DOI: 10.1177/09544089241277692
M. Giridharadhayalan, T. Ramkumar, M. Selvakumar
The composite material under this investigation was fabricated using the microwave sintering process. The matrix materials chosen for the preparation of composite materials include pure titanium (Ti), aluminium (Al), and tin (Sn). Tungsten (W) is used as the reinforcing material, with variable weight percentages of 0.5%, 1%, 1.5%, 2%, and 2.5%. The purpose of this study is to assess the fundamental mechanical properties (microhardness, elastic moduli, fracture toughness, contact stiffness, etc.) and surface degradation properties (wear) of the composite materials that were fabricated. Furthermore, energy-dispersive X-ray spectroscopy with line mapping analysis were performed to verify the existence of reinforcement particles evenly distributed in the matrix material and scanning electron microscope (FE-SEM) examination was done on the wear tested samples. The density of the Ti-5Al-2.5Sn-2W composite material has been enhanced in comparison to the density of Ti-5Al-2.5Sn. The results of the Micro Vickers hardness test indicate that the Ti-5Al-2.5Sn-2W composite exhibits a hardness that is 3.1% higher than that of the Ti-5Al-2.5Sn material. In comparison to Ti-5Al-2.5Sn, the Ti-5Al-2.5Sn-2W composite displayed a 10% lower wear rate and 7% coefficient of friction, respectively. The findings show that increasing the weight percentage of tungsten (W) greatly enhances the mechanical and wear characteristics of the composites.
本次研究的复合材料是采用微波烧结工艺制作的。用于制备复合材料的基体材料包括纯钛(Ti)、铝(Al)和锡(Sn)。钨(W)用作增强材料,其重量百分比分别为 0.5%、1%、1.5%、2% 和 2.5%。本研究的目的是评估所制造的复合材料的基本机械性能(显微硬度、弹性模量、断裂韧性、接触刚度等)和表面降解性能(磨损)。此外,还进行了能量色散 X 射线光谱和线图分析,以验证是否存在均匀分布在基体材料中的增强粒子,并对磨损测试样品进行了扫描电子显微镜(FE-SEM)检查。与 Ti-5Al-2.5Sn 的密度相比,Ti-5Al-2.5Sn-2W 复合材料的密度有所提高。显微维氏硬度测试结果表明,Ti-5Al-2.5Sn-2W 复合材料的硬度比 Ti-5Al-2.5Sn 材料高 3.1%。与 Ti-5Al-2.5Sn 相比,Ti-5Al-2.5Sn-2W 复合材料的磨损率和摩擦系数分别降低了 10%和 7%。研究结果表明,增加钨(W)的重量百分比可大大提高复合材料的机械和磨损特性。
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引用次数: 0
Dissipative MHD flow of ternary hybrid Ag–TiO2–Al2O3/H2O nanofluid over an inclined sheet with activation energy 具有活化能的 Ag-TiO2-Al2O3/H2O 三元混合纳米流体在倾斜片上的耗散 MHD 流动
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-30 DOI: 10.1177/09544089241272918
B. Shankar Goud, Utpal Jyoti Das, Nayan Mani Majumdar
This study has been carried out to understand unsteady MHD slip flow of water-based ternary hybrid nanofluid, including platelet Ag, titanium dioxide [Formula: see text] and cylindrical [Formula: see text] nanoparticles, across an angled sheet. The complicated scenario above investigates how ternary hybrid nanofluid behaves when it stretched across an inclined surface in the existence of magnetic field. Understanding of this relationship is essential in complex thermal systems, such as energy-generating technologies and cooling mechanisms. This study can help optimise heat transfer rates, improve thermal conductivity and increase efficiency in real applications by adjusting flow parameters and temperature distribution. In the existence of first-order velocity slip, heat transfer has been examined, taking into account porous media, activation energy, and chemical reaction. The novel impacts of magnetic field and effective thermophysical properties of ternary nanofluid are considered, and a new model for heat transfer is successfully implemented. Oil extraction from hydrocarbon sources and smelting metal and semiconductor combinations to create semiconductor devices comprise two useful applications for this activity. The study is more accommodating due to the Soret effect. The relevant similarity transformations are applied in primary equations, and a built-in bvp4c program is employed for solutions. The effectiveness of the numerical approach is demonstrated by thorough agreement with results published in the past. Key conclusions are as follows: greater values of first-order slip parameter cause the flow to slow down; increase in the Soret number causes the flow to speed up; and fluid movement slips by higher values of the chemical reaction. Activation energy enhances the fluid concentration.
本研究旨在了解水基三元混合纳米流体(包括板状银、二氧化钛[式:见正文]和圆柱形[式:见正文]纳米颗粒)在斜面上的非稳定 MHD 滑动流。上述复杂情景研究了三元混合纳米流体在磁场作用下穿过倾斜表面时的行为。了解这种关系对于复杂的热系统(如能源生成技术和冷却机制)至关重要。这项研究有助于在实际应用中通过调整流动参数和温度分布来优化传热率、改善导热性和提高效率。在存在一阶速度滑移的情况下,考虑到多孔介质、活化能和化学反应,对传热进行了研究。考虑了磁场和三元纳米流体有效热物理性质的新影响,并成功实现了一种新的传热模型。从碳氢化合物资源中提取石油以及熔炼金属和半导体组合以制造半导体器件是这项活动的两个有用的应用领域。由于索雷特效应,这项研究更具包容性。在主方程中应用了相关的相似变换,并使用内置的 bvp4c 程序进行求解。数值方法与过去发表的结果完全一致,这证明了数值方法的有效性。主要结论如下:一阶滑移参数值越大,流动速度越慢;索雷特数越大,流动速度越快;化学反应值越大,流体运动越缓慢。活化能提高了流体浓度。
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引用次数: 0
Sensitivity analysis-based quality optimization strategy for multi-correlation parameters in spinning process 基于灵敏度分析的纺纱过程多相关参数质量优化策略
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-28 DOI: 10.1177/09544089241270749
Sheng Hu, Di Wu, Xi Zhang, Pinjian Wang
To address the problem of quality optimization of multi-correlation parameters in the spinning process, this paper proposes a new method based on a sparrow search algorithm (SSA). Firstly, a generalized regression neural network (GRNN) is used to investigate the impact of the spinning process parameters on yarn quality, and quality forward modeling in the spinning process is established. And based on the coupling and correlation characteristics of spinning process parameters, sensitivity analysis is used to analyze the influence of each spinning process parameter on yarn quality, the correlation spinning process parameters for further analysis. Then a model of quality optimization with spinning process parameters is established, and SSA is used to solve the model of quality optimization with multi-correlation parameters in the spinning process. Finally, the effectiveness of the proposed method was validated through an instance. The results show that the optimal spinning process parameters combination generation of [32.159 5.2 0.8 14.8 24.540 8588.677 21.708] occurs in a configuration with a fitness value of 0.0003. The proposed sensitivity analysis-based quality optimization strategy reveals good performances in terms of both convergence speed and optimization accuracy, which will provide guidance for improving yarn quality.
针对纺纱过程中多相关参数的质量优化问题,本文提出了一种基于麻雀搜索算法(SSA)的新方法。首先,利用广义回归神经网络(GRNN)研究纺纱工艺参数对纱线质量的影响,建立纺纱工艺质量前向模型。并根据纺纱工艺参数的耦合性和相关性特点,采用灵敏度分析法分析各纺纱工艺参数对纱线质量的影响,对相关纺纱工艺参数作进一步分析。然后建立了带纺纱工艺参数的质量优化模型,并利用 SSA 对纺纱工艺中多相关参数的质量优化模型进行求解。最后,通过实例验证了所提方法的有效性。结果表明,最优纺纱工艺参数组合生成[32.159 5.2 0.8 14.8 24.540 8588.677 21.708]的配置,适配值为 0.0003。所提出的基于灵敏度分析的质量优化策略在收敛速度和优化精度方面都有很好的表现,这将为提高纱线质量提供指导。
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引用次数: 0
A new strategy for manufacturing, modeling, and optimization of 3D printed polylactide based on multiple nonlinear neuro regression analysis and stochastic optimization methods 基于多重非线性神经回归分析和随机优化方法的 3D 打印聚乳酸制造、建模和优化新策略
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-28 DOI: 10.1177/09544089241272909
Melih Savran, Levent Aydin, Asil Ayaz, Tuğrul Uslu
Although there are many studies related to design, modeling, and optimization of fused deposition modeling (FDM) process parameters in the literature, the absence of a systematic approach to increase the reliability of model selection and optimization results is an important shortcoming that must be addressed. To make up for this deficiency, a new strategy was proposed to obtain desired quality on mechanical properties by adjusting FDM process parameters. This attempt involves manufacturing, modeling, and optimization point of view. The D-optimal method was employed to form experiment set, including process parameters. A hybrid approach neuro regression combining artificial neural network (ANN) and regression analysis together was used for modeling of FDM process. The most significant advantage of the neuro-regression approach compared to ANN is that the mathematical models can be used directly without needing any transformation. This is not possible in neural networks and, therefore, significantly limits and complicates the use of models obtained using ANN. The present study aims at optimization of the FDM process parameters, including infill density, infill pattern, layer thickness, and print speed on ultimate strength, fracture strength, and fracture strain for polylactide (PLA). In this regard, modified versions of the optimization algorithms Differential Evolution, Nelder Mead, and Simulated Annealing were used to find the best or elite designs. Linear or nonlinear models consisting of polynomial, trigonometric, and logarithmic expressions and their hybrid forms were employed to define the strength and strain behavior of PLA. It is concluded that (a) implementations of the optimization algorithms provide a 19% improving the minimum strain value if it is compared with the experimental results, (b) infill pattern types ( x2) were found as honeycomb, triangle, and cubic for the designs in terms of maximum fracture strength, minimum strain, and maximum ultimate tensile strength respectively, (c) many alternatives near optimum local designs could be obtained based on Nelder Mead algorithm for fracture strength and ultimate strength parameters. Thus, this allows work in a wide range of applications without depending on a single result for production.
尽管文献中有许多与熔融沉积建模(FDM)工艺参数的设计、建模和优化相关的研究,但缺乏一种系统的方法来提高模型选择和优化结果的可靠性,这是一个必须解决的重要缺陷。为了弥补这一不足,我们提出了一种新策略,通过调整 FDM 工艺参数来获得理想的机械性能质量。这一尝试涉及制造、建模和优化三个方面。我们采用了 D-optimal 方法来形成实验集,包括工艺参数。结合人工神经网络(ANN)和回归分析的混合方法神经回归被用于 FDM 工艺建模。与人工神经网络相比,神经回归方法的最大优势在于数学模型无需任何转换即可直接使用。这在神经网络中是不可能实现的,因此极大地限制了使用 ANN 所获模型的使用并使其复杂化。本研究旨在优化 FDM 工艺参数,包括填充密度、填充图案、层厚度和打印速度对聚乳酸(PLA)极限强度、断裂强度和断裂应变的影响。在这方面,使用了差分进化、奈德米德和模拟退火等优化算法的改进版本,以找到最佳或优秀的设计。采用由多项式、三角函数和对数表达式及其混合形式组成的线性或非线性模型来定义聚乳酸的强度和应变行为。结果表明:(a) 与实验结果相比,优化算法的实施使最小应变值提高了 19%;(b) 就最大断裂强度、最小应变和最大极限抗拉强度而言,发现蜂窝状、三角形和立方体填充图案类型 ( x2) 的设计;(c) 基于 Nelder Mead 算法,可以获得许多接近最佳局部设计的断裂强度和极限强度参数。因此,这样就可以在广泛的应用领域开展工作,而不必依赖于单一的生产结果。
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引用次数: 0
Impact of deposition pressure on the structural, nanomechanical, and tribological properties of δ-TaN coatings deposited via magnetron sputtering on Ti6Al7Nb alloy 沉积压力对通过磁控溅射沉积在 Ti6Al7Nb 合金上的δ-TaN 涂层的结构、纳米力学和摩擦学特性的影响
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-28 DOI: 10.1177/09544089241272870
Vivek Singh, Rajesh Kumar Sharma, Rakesh Sehgal
In the present study, δ-TaN thin films were deposited by reactive magnetron sputtering (physical vapour deposition) on Ti6Al7Nb alloy by varying the deposition pressure (0.8–0.2 Pa). Their crystalline structure, chemical composition, surface roughness, and surface morphology were investigated by using grazing incidence X-ray diffraction, energy dispersive spectroscopy, scanning probe microscope, and field emission scanning electron microscopy (FESEM), respectively. Structural analysis results confirmed the deposition of cubic δ-TaN thin films along the (111) basal plane; moreover, spherical dome-like surface morphology was observed by FESEM. Further, to analyze the nanomechanical properties of the deposited δ-TaN coatings, such as hardness (H) and modulus (E), scratch tests were performed utilizing the nanomechanical system. Moreover, friction and wear properties of the coating and bare sample (substrate) were investigated on nano-tribometer equipment using a rotary ball-on-disk type configuration. The stainless steel (SS-316) and silicon nitride (Si3N4) balls were used as the counter materials for the tribological tests. The observations of nanomechanical tests revealed that H (GPa), E (GPa), and H/E ratio values increased from 11.83 to 28.30 GPa, 176.02 to 248.45 GPa, and 0.06 to 0.11, respectively, with the decrease of the deposition pressure. In the scratch test, the highest critical load (cohesion failure) was found for δ-TaN coating deposited at the lowest deposition pressure (0.2 Pa). Tribological results of δ-TaN coatings demonstrated average coefficient of friction (COF) value ranges between 0.066–0.092 and 0.072–0.029 against steel and Si3N4 balls, respectively. The wear rate values were observed to vary from 8.15 × 10−5 to 7.56 × 10−6 and from 1.77 × 10−3 to 8.99 × 10−6 against steel and Si3N4 balls, respectively. Generally, the average COF and wear rate decreased against 316 SS and Si3N4 balls as the deposition pressure of coatings decreased. However, the coating deposited at 0.8 and 0.6 Pa against Si3N4 ball showed early delamination of the coating, resulting in the sudden fluctuation in COF plots and higher wear rate in the range of 10−3 mm3/N.m.
在本研究中,通过改变沉积压力(0.8-0.2 Pa),采用反应磁控溅射(物理气相沉积)在 Ti6Al7Nb 合金上沉积了 δ-TaN 薄膜。利用掠入射 X 射线衍射、能量色散光谱、扫描探针显微镜和场发射扫描电子显微镜分别研究了它们的晶体结构、化学成分、表面粗糙度和表面形貌。结构分析结果证实,δ-TaN薄膜沿(111)基面沉积为立方体;此外,场发射扫描电子显微镜还观察到了球形圆顶状的表面形貌。此外,为了分析沉积的 δ-TaN 涂层的纳米机械性能,如硬度(H)和模量(E),利用纳米机械系统进行了划痕测试。此外,还使用旋转球盘式配置的纳米测距仪设备研究了涂层和裸样品(基底)的摩擦和磨损特性。摩擦学测试使用了不锈钢(SS-316)和氮化硅(Si3N4)球作为对抗材料。纳米力学测试结果表明,随着沉积压力的降低,H(GPa)、E(GPa)和 H/E 比值分别从 11.83 GPa 增加到 28.30 GPa、176.02 GPa 增加到 248.45 GPa 和 0.06 增加到 0.11。在划痕试验中,在最低沉积压力(0.2 Pa)下沉积的δ-TaN 涂层的临界载荷(内聚失效)最高。摩擦学结果表明,δ-TaN 涂层与钢球和 Si3N4 球的平均摩擦系数(COF)值分别在 0.066-0.092 和 0.072-0.029 之间。对钢球和 Si3N4 球的磨损率值分别为 8.15 × 10-5 至 7.56 × 10-6 和 1.77 × 10-3 至 8.99 × 10-6。一般来说,随着涂层沉积压力的降低,316 SS 和 Si3N4 球的平均 COF 和磨损率都有所下降。然而,在 0.8 Pa 和 0.6 Pa 下沉积的涂层对 Si3N4 球的磨损率较高,导致 COF 图的突然波动和 10-3 mm3/N.m 范围内的磨损率增加。
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引用次数: 0
Exploring the machining characteristics of aluminum 6061 using nanosecond pulse fiber laser machine 使用纳秒脉冲光纤激光加工机探索铝 6061 的加工特性
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-28 DOI: 10.1177/09544089241276337
Guddakesh Kumar Chandan, Mohd Aslam, Subhankar Saha, Brajesh Kumar Kanchan
The present study aims to probe the influence of nanosecond laser parameters on the surface quality of aluminum material (Al 6061) using a full factorial design approach. Additionally, the study utilizes the Harris Hawks optimization (HHO) algorithm to determine the optimized laser parameters for achieving desirable surface features on straight-cut aluminum samples. Subsequently, the machined samples are analyzed through optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The evaluation criteria for the present study are taper, surface roughness, and heat-affected zone (HAZ) thickness. The results revealed that average laser power significantly impacted the taper (17.01%), and scanning speed contributed significantly to the taper (26.62%). The average power and scanning speed combined showed the most substantial influence on taper (47.76%). Furthermore, the average power had the most significant effect on the heat-affected zone (77.76%) and surface roughness (SR) (72.22%). The optimal conditions determined by the HHO were a pulse frequency of 100 Hz, a scanning speed of 10 mm/s, and an average power of 40 W, resulting in heat-affected zone = 36.047, surface roughness = 5.496, and taper angle = 23.188. These findings hold significant implications for enhancing the surface characteristics of aluminum in laser machining processes, thereby benefiting industries such as aerospace, automotive, and electronics.
本研究采用全因子设计方法,旨在探究纳秒激光参数对铝材料(Al 6061)表面质量的影响。此外,本研究还利用哈里斯-霍克斯优化(HHO)算法确定优化的激光参数,以便在直切铝样品上获得理想的表面特征。随后,通过光学显微镜、扫描电子显微镜(SEM)和能量色散光谱(EDS)对加工样品进行分析。本研究的评估标准是锥度、表面粗糙度和热影响区(HAZ)厚度。结果显示,平均激光功率对锥度的影响很大(17.01%),扫描速度对锥度的影响很大(26.62%)。平均功率和扫描速度之和对锥度的影响最大(47.76%)。此外,平均功率对热影响区(77.76%)和表面粗糙度(SR)(72.22%)的影响最大。HHO 确定的最佳条件是脉冲频率为 100 Hz,扫描速度为 10 mm/s,平均功率为 40 W,结果热影响区 = 36.047,表面粗糙度 = 5.496,锥角 = 23.188。这些发现对于在激光加工过程中提高铝的表面特性具有重要意义,从而有利于航空航天、汽车和电子等行业。
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引用次数: 0
Internal flow stability analysis of vertical mixed-flow pump device based on EGT and FFT 基于 EGT 和 FFT 的立式混流泵设备内部流量稳定性分析
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-28 DOI: 10.1177/09544089241271782
Xiaoyu Jin, Fan Yang, Shengjie Sun, Rongsheng Xie, Guangxin Zhou, Fangping Tang
With the purpose of researching the internal flow stability of the vertical mixed-flow pump device (VMFPD), the entire flow field was solved through the very large-eddy simulation (VLES) k- ω model and the internal flow characteristics of the pump device were quantitatively analyzed with the use of the energy gradient theory (EGT) along with the physical parameters of the flow field. The research elucidates the variety rule of the pressure along the VMFPD and the energy gradient function K as well as the time-frequency features of the pressure pulsation (PP) in the impeller and guide vane. The results demonstrate that the solid wall restriction of the guide vane and the impeller rotation cause a significant shift in the velocity and direction of the water flow. This causes a significant pressure difference between the water bodies, which makes it easier to create an unstable flow. The suction surface of the impeller blade possesses the great concentration of the area with energy gradient function K > 107, which is the critical area influencing the internal flow stability of the pump device.
为了研究立式混流泵装置(VMFPD)的内部流动稳定性,通过超大涡模拟(VLES)k- ω模型求解了整个流场,并利用能量梯度理论(EGT)结合流场物理参数定量分析了泵装置的内部流动特性。研究阐明了 VMFPD 沿线压力的变化规律和能量梯度函数 K,以及叶轮和导叶中压力脉动 (PP) 的时频特征。结果表明,导叶的实壁限制和叶轮旋转会导致水流速度和方向发生显著变化。这会导致水体之间产生明显的压力差,从而更容易产生不稳定流。叶轮叶片的吸入面是能量梯度函数 K > 107 的集中区域,是影响水泵装置内部流动稳定性的关键区域。
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引用次数: 0
Study on a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder 正流量泵先导液压缸非线性动态特性研究
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-28 DOI: 10.1177/09544089241271864
Weiqi Sun, Yong Sang, Lianjie Liao, Luming Jiang, Guoshuai Li, Fuhai Duan
The displacement of the positive flow pump is controlled by its pilot hydraulic cylinder. The tracking performance of the pump displacement directly affects the energy saving of the hydraulic excavator through power matching. In this article, a nonlinear dynamic characteristic of the positive flow pump in its pilot hydraulic cylinder is studied to improve the mathematical model for controller design. The concept of relative water hammer is first proposed to describe the relative pressure wave acting on the hydraulic piston to illustrate the mechanism of the nonlinearity. Chaotic motion can be generated by the relative water hammer when the hydraulic piston is in a partial stroke. The mathematical model is derived and its critical parameters are analyzed. The simulation and experimental results verify the existence of the relative water hammer and the effect of each critical parameter on the pilot hydraulic cylinder and the positive flow pump.
正流量泵的排量由其先导液压缸控制。通过功率匹配,泵排量的跟踪性能直接影响液压挖掘机的节能效果。本文研究了正流量泵先导液压缸的非线性动态特性,以改进控制器设计的数学模型。首先提出了相对水锤的概念来描述作用在液压活塞上的相对压力波,以说明非线性的机理。当液压活塞处于部分行程时,相对水锤会产生混沌运动。推导出了数学模型,并对其关键参数进行了分析。仿真和实验结果验证了相对水锤的存在以及各关键参数对先导液压缸和正流量泵的影响。
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引用次数: 0
Prediction models for seal performance of a space seal considering atomic oxygen effects 考虑原子氧效应的空间密封件密封性能预测模型
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-28 DOI: 10.1177/09544089241274053
Chuanjun Liao, Mingzhao Xu, Wei Da, Hailiang Sun
A low impact docking system with advanced capabilities has been developing for future spacecrafts, and its main interface docking seal (MIDS) is both a critical component and a research topic of interest. It is a typical design for the MIDS that adopts the elastomer seal-on-seal structure made of silicone rubbers, and the atomic oxygen (AO) in space had been found to take great effects on the sealing performance by previous experimental studies, especially for the seal leak, seal adhesion, and compression set. Exposure to AO may cause obvious changes on the sealing surface of the MIDS, and some characteristic parameters of morphology are proposed to characterize the changes in this study, including of the porosity, roughness and radius of curvature. Both the leakage model and the adhesion model of the MIDS are further developed to predict the sealing performance considering AO effects, which had been confirmed by the application experiments. The experimental data are in good agreement with the calculation data. The effects of AO on the sealing performance are simulated and analyzed by the proposed prediction models. The results are beneficial to the developments of the MIDS and other space seals.
目前正在为未来的航天器开发一种具有先进功能的低冲击对接系统,其主界面对接密封件(MIDS)既是一个关键部件,也是一个值得关注的研究课题。MIDS 的典型设计是采用硅橡胶制成的弹性体密封对密封结构,以往的实验研究发现,太空中的原子氧(AO)对密封性能有很大影响,尤其是在密封泄漏、密封粘附和压缩永久变形方面。暴露于 AO 会使 MIDS 的密封面发生明显变化,本研究提出了一些形态特征参数来表征这些变化,包括孔隙率、粗糙度和曲率半径。考虑到 AO 的影响,进一步建立了 MIDS 的泄漏模型和粘附模型,以预测其密封性能。实验数据与计算数据非常吻合。提出的预测模型模拟并分析了 AO 对密封性能的影响。这些结果有利于 MIDS 和其他空间密封件的开发。
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引用次数: 0
Impact of the Brownian motion and thermophoretic diffusion during the radiative MHD hybrid nanofluid flow past a stretching sheet 辐射 MHD 混合纳米流体流经拉伸片时布朗运动和热泳扩散的影响
IF 2.4 4区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-08-26 DOI: 10.1177/09544089241272751
Humaira Gul, Muhammad Ayaz, Saeed Islam, Asad Ullah, Emad A. A. Ismail, Fuad A. Awwad
The article aims to analyze the effects of thermophoretic and Brownian motion on steady three-dimensional magnetohydrodynamics with fully developed natural convective hybrid nanofluid flow past a bidirectionally extending sheet. We assumed the water-based copper and aluminum nanoparticles suspension under the influence of the rotational effect, nonlinear chemical reaction, thermal radiations, viscous dissipation, and heat source. The flow field is modeled with the help of the basic equations. Furthermore, the problem is reduced to ordinary differential equations (ODEs) with the similarity variables. The reduced system of ODEs is solved with the semianalytical method (homotopy analysis method). The results for the state variables are displayed through graphs tables for various pertinent parameters. The thermal profile falls with the higher values of the Brownian and thermophoresis parameters, while the concentration profile shows an opposite trend with the increasing values of the Brownian parameter. Also, the slip parameter decreases both the thermal and concentration profiles as well as the surface drag. The velocity profiles along both directions fall with the higher magnetic strength and porosity parameters. The heat source and radiations parameter enhances the thermal profile with increasing values. The study also recommends the opposite trends for the axial and transverse velocities with increasing value of the stretching ratio factor. The proposed method convergence is present through [Formula: see text] curves for the regions [Formula: see text] [Formula: see text] [Formula: see text] and [Formula: see text] The skin friction and Nusselt number are displayed through tables numerically for various values of volume fraction and other important parameters.
文章旨在分析热泳运动和布朗运动对流经双向延伸薄片的稳定三维磁流体动力学的影响。我们假设水基铜铝纳米颗粒悬浮液受到旋转效应、非线性化学反应、热辐射、粘性耗散和热源的影响。借助基本方程对流场进行建模。此外,该问题被简化为具有相似变量的常微分方程(ODE)。用半解析法(同调分析法)求解简化的 ODE 系统。状态变量的结果通过各种相关参数的图表显示出来。热曲线随着布朗参数和热泳参数值的增加而下降,而浓度曲线则随着布朗参数值的增加而呈现相反的趋势。此外,滑移参数会降低热剖面和浓度剖面以及表面阻力。磁强度和孔隙度参数越高,沿两个方向的速度剖面都会下降。热源和辐射参数的数值越大,热剖面越明显。研究还发现,随着拉伸比系数的增加,轴向速度和横向速度的趋势相反。
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Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
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