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Nanoparticle shape effects on hydromagnetic flow of Cu‐water nanofluid over a nonlinear stretching sheet in a porous medium with heat source, thermal radiation, and Joule heating 在热源、热辐射和焦耳加热条件下,纳米颗粒形状对Cu - water纳米流体在多孔介质中非线性拉伸片上磁流的影响
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-28 DOI: 10.1002/zamm.202300188
C. M. Mohana, B. R. Kumar
In this article, the shape effects of copper‐water nanofluid on magnetohydrodynamic boundary layer flow and heat transfer over a nonlinear stretching sheet in a porous medium under the influence of radiation, a heat source, and Joule heating effects are studied. The primary objective of this study is to determine which shape of nanoparticle is most effective in terms of heat transfer rate and to analyze how nanoparticle shape affects it. The governing PDEs are transformed to ODEs through similarity variables, and the numerical solutions are computed with the help of MATLAB's built‐in bvp4c solver. Plots of the velocity and temperature profiles are shown for various key parameters. The stretching parameter decreases both velocity and temperature, whereas the magnetic parameter, porosity, Eckert number, radiation, and heat source escalate temperature profiles. The heat transfer rate of lamina‐shaped nanoparticles is higher than that of other shapes.
在本文中,研究了在辐射、热源和焦耳热效应的影响下,铜-水纳米流体的形状对多孔介质中非线性拉伸片的磁流体动力学边界层流动和传热的影响。本研究的主要目的是确定哪种形状的纳米颗粒在传热率方面最有效,并分析纳米颗粒形状如何影响传热率。通过相似变量将控制偏微分方程转换为偏微分方程,并利用MATLAB内置的bvp4c求解器计算数值解。给出了各关键参数的速度和温度分布图。拉伸参数降低了速度和温度,而磁性参数、孔隙度、Eckert数、辐射和热源使温度曲线升高。片状纳米颗粒的传热速率高于其他形状的纳米颗粒。
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引用次数: 1
Nonlinear flow of hybrid nanofluid with thermal radiation: A numerical investigation 热辐射混合纳米流体非线性流动的数值研究
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-28 DOI: 10.1002/zamm.202200170
Bilal Ahmad, Tasawar Abbas, Kiran Fatima, Faisal Z. Duraihem, S. Saleem
In this research, we investigate the mixed convection flow of hybrid nano fluid over nonlinear stretching sheet. By imposition of Cu‐Al2O3 as nanoparticles, water as base fluid. Impact of thermal radiation in the existence of magnetic field is considered. Similarity solution is obtained numerically by RK‐Fehlberg (RKF) Method. The velocity field is experimentally stronger due to the force of magnetic parameter. For the case of stretched and shrinkage aiding buoyancy force and opposite flow revealed the bifurcation solution. Velocity of hybrid nanofluid decreases in the presence of magnetic field, while temperature of nanofluid increases for thermal radiation.
本文研究了混合纳米流体在非线性拉伸薄片上的混合对流流动。通过施加Cu - Al2O3作为纳米颗粒,水作为基液。考虑了磁场存在时热辐射的影响。采用RK‐Fehlberg (RKF)方法数值求解相似解。在实验中,由于磁参量的作用力,速度场更强。在受拉伸和收缩的情况下,辅助浮力和逆流的情况下,给出了分岔解。混合纳米流体在磁场作用下速度降低,热辐射作用下温度升高。
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引用次数: 0
Development of convective heat transport in nanofluid flow of Oldroyd‐B model with magnetic dipole moment 基于磁偶极矩的Oldroyd - B纳米流体对流热传输模型的研究进展
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-27 DOI: 10.1002/zamm.202200564
Shuguang Li, S. Khan, Kamel Al-khaled, Ezzat A. Ali, M. Khan, K. M. A. Elamin, Bandar M. Fadhl, B. Makhdoum
The phenomenon of heat as well as mass transfer due to ferromagnetic flow of Oldroyd‐B nanofluid is addressed. The additional thermal source like heat source, thermal radiation, and activation energy features has been implemented to extend the dynamic of flow problem. The source of flow is moving stretching surface with magnetic dipole impact. The convective boundary conditions are implemented. The Boungrino nanofluid model is used to observe the thermophoresis and Brownian motion consequences. The mathematical modeling of problem in view of flow assumptions will be converted into the non‐dimensional form. The numerical shooting technique will be implemented for presenting the approximate simulations. After verifying the solution accuracy, the physical dynamic of problem with variation of parameter is presented. It is noticed that the velocity profile reduces due to ferrohydrodynamic interaction parameter. An enhanced thermal profile is observed due to relaxation time constant and ferrohydrodynamic interaction parameter. Furthermore, the concentration profile reduces for retardation time constant parameter.
研究了Oldroyd - B纳米流体铁磁流动引起的传热传质现象。引入热源、热辐射、活化能等附加热源特征,扩展了流动问题的动态性。流源为磁偶极子冲击下的运动拉伸面。实现了对流边界条件。利用Boungrino纳米流体模型观察了热泳动和布朗运动的结果。考虑流动假设的问题的数学模型将被转换为非量纲形式。采用数值射击技术进行近似模拟。在验证了解的精度后,给出了参数变化问题的物理动态。注意到由于铁流体动力相互作用参数的影响,速度剖面减小。由于松弛时间常数和铁流体动力相互作用参数的增加,热剖面得到了增强。此外,延迟时间常数参数降低了浓度分布。
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引用次数: 0
Entropy generation analysis of CNT‐based nanofluid flows induced by a moving plate 移动板诱导碳纳米管纳米流体流动的熵生成分析
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-27 DOI: 10.1002/zamm.202200555
M. Sarfraz, Masood Khan
Carbon nanotubes have garnered considerable interest from academia and industry due to their unique properties and potential applications. This study examines fluid flow induced by a plate moving at a constant velocity towards/receding from normal stagnation point flow. The plate's surface is immersed with ethylene glycol and two types of carbon nanotubes: single‐walled and multi‐walled. The Reynolds number, proportional to the plate's velocity, governs the flow. Thermal transport analysis includes Ohmic heating, heat source/sink effects for constant wall temperature and prescribed surface temperature, and entropy generation analysis. Similarity ansatz is used to obtain non‐dimensional ordinary differential equations, and numerical and asymptotic solutions are computed using MATLAB's bvp4c routine (finite difference‐based approach). By varying the relevant parameters, the study interprets the behavior of entropy generation, Bejan number, skin frictions, Nusselt number, flow, and energy profiles. The numerical solutions are observed to match their asymptotic behaviors within an intermediate range of small and large Reynolds numbers for the wall stress parameter. The magnetic parameter produces a resistive force that reduces fluid flow but enhances the system's energy. Moreover, understanding the flow and heat transfer characteristics of CNT‐based nanofluids induced by a moving plate can provide insights into the design and optimization of thermal systems, including efficient heat exchangers used in power generation, chemical, and petrochemical industries.
碳纳米管由于其独特的性能和潜在的应用前景,引起了学术界和工业界的极大兴趣。本研究考察了一个板块以恒定速度向正常驻点流动移动或从正常驻点流动后退所引起的流体流动。板的表面浸有乙二醇和两种类型的碳纳米管:单壁和多壁。雷诺数与板的速度成正比,控制着流动。热传递分析包括欧姆加热,恒定壁温和规定表面温度下的热源/汇效应,以及熵生成分析。相似性分析用于获得无维常微分方程,并使用MATLAB的bvp4c例程(基于有限差分的方法)计算数值解和渐近解。通过改变相关参数,该研究解释了熵生成、贝让数、表面摩擦、努塞尔数、流量和能量分布的行为。数值解在壁面应力参数的小雷诺数和大雷诺数中间范围内的渐近行为是一致的。磁性参数产生的阻力减少了流体流动,但提高了系统的能量。此外,了解由移动板引起的基于碳纳米管的纳米流体的流动和传热特性可以为热系统的设计和优化提供见解,包括用于发电,化工和石化工业的高效热交换器。
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引用次数: 0
Tumor spheroid with almost periodic nutrient and inhibitor supplies 肿瘤球体几乎具有周期性的营养和抑制剂供应
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-24 DOI: 10.1002/zamm.202200228
H. Díaz-Marín, O. Osuna
We describe the time‐evolution of a tumor spheroid without necrotic core using the quasi‐stationary reaction–diffusion approach. We assume that inhibitor and nutrient supplies are time‐dependent and oscillating by incorporating continuous almost periodic functions in the model. The functional form of the intensity of the mitosis is supposed to be the product of two linear functions depending on the nutrient concentration σ and of the inhibitor concentration, β, respectively. Under some mild conditions, we give criteria predicting two possible global asymptotic limits: either the tumor oscillates converging towards a stable global almost periodic solution or the tumor shrinks as time increases.
我们使用准平稳反应扩散方法描述了无坏死核心的肿瘤球体的时间演化。我们假设抑制剂和营养供应是时间依赖的,并且通过在模型中加入连续的几乎周期函数来振荡。有丝分裂强度的函数形式应该是两个分别依赖于营养物浓度σ和抑制剂浓度β的线性函数的乘积。在一些温和的条件下,我们给出了预测两种可能的全局渐近极限的准则:肿瘤振荡收敛于稳定的全局概周期解或肿瘤随着时间的增加而缩小。
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引用次数: 0
Photothermal interactions in a semiconducting fiber‐reinforced elastic medium with temperature‐dependent properties under dual‐phase‐lag model 双相位滞后模型下半导体纤维增强弹性介质中温度相关特性的光热相互作用
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-22 DOI: 10.1002/zamm.202300316
Shilpa Chaudhary, K. K. Kalkal, Sandeep Singh Sheoran
This article highlights the study of photothermoelastic interactions in a semiconducting fiber‐reinforced anisotropic medium with temperature‐dependent properties. The model is studied in the context of the photothermal transport process with dual‐phase‐lag theory of generalized thermoelasticity. The governing equations describe the interactions between elastic and plasma thermal waves. The normal mode analysis is employed to procure the exact expressions of the physical fields under investigation. A mechanical load is applied at the outer free surface of the medium to obtain the complete solution of the displacements, stresses, temperature, and carrier density distributions. Numerical results are obtained and displayed graphically with the help of MATLAB software. Some special cases of interest have been deduced from the present study and comparisons are also made among the different theories of thermoelasticity.
本文重点研究了具有温度依赖性的半导体纤维增强各向异性介质中的光热弹性相互作用。利用广义热弹性的双相滞后理论,在光热输运过程中对该模型进行了研究。控制方程描述了弹性热波和等离子体热波之间的相互作用。采用正态分析得到了所研究的物理场的精确表达式。在介质的外自由表面施加机械载荷,以获得位移、应力、温度和载流子密度分布的完整解。利用MATLAB软件进行了数值计算,并以图形化的方式显示了结果。从本文的研究中推导出一些值得注意的特殊情况,并对不同的热弹性理论进行了比较。
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引用次数: 0
Size‐dependent Levinson beam theory for thermal vibration of a nanobeam with deformable boundary conditions 具有可变形边界条件的纳米梁热振动的尺寸依赖Levinson梁理论
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-17 DOI: 10.1002/zamm.202300336
Ö. Civalek, B. Deliktas, B. Uzun, M. Yaylı
In this study, an eigen‐value problem for deformable boundary conditions in nonlocal elasticity is described using Levinson beam theory. Firstly, the nanobeam has been modeled by placing two springs that can be deformed in the downward direction. These springs control the amount of downward displacement at the ends. In the analytical solution, the displacement points are defined by two coefficients and the interior part of the nanobeam deflection is expressed by Fourier sine series. Stokes’ transformation is preferred to enforce the boundary conditions to the desired point. After the mathematical operations, a matrix of coefficients including the general elastic spring constants has been found. The eigenvalues of this coefficient matrix give the frequencies of the Levinson nanobeam. The effect of some parameters on the free vibration frequencies is shown in a series of graphs and tables.
本文利用Levinson梁理论,讨论了非局部弹性中可变形边界条件的本征值问题。首先,通过放置两个可以向下变形的弹簧来模拟纳米梁。这些弹簧控制着两端向下位移的量。在解析解中,位移点由两个系数定义,纳米梁挠度的内部部分由傅里叶正弦级数表示。最好使用Stokes变换将边界条件强制到所需点。经过数学运算,得到了包含弹性弹簧一般常数的系数矩阵。该系数矩阵的特征值给出了列文森纳米梁的频率。一些参数对自由振动频率的影响用一系列的图表表示出来。
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引用次数: 0
An influence of radiation and magnetohydrodynamic flow of hybrid nanofluid past a stretching/shrinking sheet with mass transpiration 辐射和磁流体动力学对混合纳米流体通过具有质量蒸腾的拉伸/收缩薄片的影响
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-08 DOI: 10.1002/zamm.202300140
T. Maranna, U. S. Mahabaleshwar, S. N. Ravichandra Nayakar, I. Sarris, B. Souayeh
This research focuses on energy convention and mass transpiration in magnetohydrodynamic hybrid nanofluid (Al2O3–Cu) flows driven by a moving surface, which build numerous applications such as inducing hypothermia in cancer tumors, reducing bleeding in severe injuries, and performing magnetic resonance imaging are only a few medical applications applying magnetohydrodynamics A similarity transformation describes the representational construction of the steady two‐dimensional nonlinear partial differential equations (PDEs) to a set of nonlinear ordinary differential equations (ODEs). Above equations subject to corresponding boundary conditions are analytically solved. Specifically, the energy equation with radiation effect is solved analytically using incomplete Gamma function. Moreover, the graphs included physical representations of the measurement can be found in this paper. In summary, our findings demonstrate that mass‐transfer induced slip has a non‐negligible impact on flows driven by a moving sheet. Mass transfer induced slip may even be able to dominate the flow driven effect of the moving sheet by changing the flow directions to flow against the sheet motion and also thermal radiation parameter increases as thermal boundary layer increases.
这项研究的重点是由移动表面驱动的磁流体动力混合纳米流体(Al2O3-Cu)流动中的能量聚集和质量蒸发,它建立了许多应用,如在癌症肿瘤中诱导低温,减少严重损伤中的出血,相似变换描述了稳定的二维非线性偏微分方程(PDEs)到一组非线性常微分方程(ode)的表征结构。在相应的边界条件下,对上述方程进行解析求解。具体来说,利用不完全伽玛函数解析求解具有辐射效应的能量方程。此外,在本文中还可以找到包含测量物理表示的图形。总之,我们的研究结果表明,质量传递引起的滑移对移动板驱动的流动具有不可忽视的影响。传质引起的滑移甚至可以通过改变流动方向,使流动方向与运动板相反,从而支配运动板的流动驱动效应,并且随着热边界层的增加,热辐射参数也会增加。
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引用次数: 1
Gradient estimates for the insulated conductivity problem with inclusions of the general m‐convex shapes 具有一般m -凸形状内含物的绝缘电导率问题的梯度估计
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-08-02 DOI: 10.1002/zamm.202200324
Zhiwen Zhao
In this paper, the insulated conductivity model with two touching or close‐to‐touching inclusions is considered in with . We establish the pointwise upper bounds on the gradient of the solution for the generalized m‐convex inclusions under these two cases with , which show that the singular behavior of the gradient in the thin gap between two inclusions is described by the first non‐zero eigenvalue of an elliptic operator of divergence form on . Finally, the sharpness of the estimates is also proved for two touching axisymmetric insulators, especially including curvilinear cubes.
本文考虑了含两个接触或接近接触夹杂物的绝缘电导率模型。在这两种情况下,我们建立了广义m -凸包涵解的梯度的点上界,证明了在两个包涵之间的狭缝中梯度的奇异性可以用散度形式为on的椭圆算子的第一个非零特征值来描述。最后,对两个接触轴对称绝缘子,特别是包含曲线立方体的绝缘子,证明了估计的锐性。
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引用次数: 1
Uniform anti‐plane stress field within two nonlinear elastic non‐elliptical inhomogeneities 两个非线性弹性非椭圆不均匀性中的均匀反平面应力场
IF 2.3 4区 工程技术 Q2 Mathematics Pub Date : 2023-07-29 DOI: 10.1002/zamm.202300443
Xu Wang, P. Schiavone
We investigate the uniformity of anti‐plane stresses inside two interacting p‐Laplacian nonlinear elastic non‐elliptical inhomogeneities embedded in an infinite linear elastic matrix subjected to uniform remote anti‐plane stresses. In our discussion, the two inhomogeneities have a common nonlinear shear modulus. The uniformity of the internal stresses is accomplished through the numerical solution of a single non‐linear equation.
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引用次数: 0
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Zamm-zeitschrift Fur Angewandte Mathematik Und Mechanik
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