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MHD Casson ternary hybrid nanofluid flow through a vertical porous plate with thermal radiation: A finite difference approach 流经垂直多孔板并伴有热辐射的 MHD Casson 三元混合纳米流体:有限差分法
Pub Date : 2024-05-25 DOI: 10.1002/zamm.202300571
K. Sakkaravarthi, I. Sakthi, P. Bala Anki Reddy
This entire study aims to investigate the impacts of linear thermal radiation and MHD Casson ternary hybrid nanofluid flows over a vertical porous plate for comparison of nanofluid, hybrid, and tri‐hybrid nanofluids with Newtonian and non‐Newtonian fluids. We used a ternary hybrid nanofluid, Blood contains three types of oxides and metals: spherical ferric oxide (Fe3O4), platelet‐shaped zinc (Zn), and cylindrically‐shaped gold (Au) nanoparticles. The coupled nonlinear dual partial differential equations (PDEs) are turned into PDEs using nondimensional quantities. The Finite Difference Method (FDM) and the Perturbation Method are then used to solve the PDEs. The impacts of different parameters on temperature, velocity, Nusselt number, and Skin friction profiles have been discussed. The increase in viscosity occurs because an increase in Gr also causes an increase in the velocity field for nanofluid, hybrid, and tri‐hybrid nanofluids. A tri‐hybrid nanofluids performs better among the three, such as nanofluid, hybrids and tri‐hybrid nanofluids. As the volume fractions (Fe3O4) increase, the temperature increase for both Newtonian and non‐Newtonian fluids. The increase in temperature is due to the thermal conductivity of nanoparticles, which is enhanced by growth estimates of the nanoparticle volume fraction. The high temperature of the fluid is observed for large estimates of nanoparticle volume fraction. An increase gold (Au) also increases the temperature for shapes (cylinder, platelet, and spherical). A spherical shape performs better among the three, such as cylinder, platelet, and spherical. In this model, biomedical applications such as antiviral and therapeutic, treatment of the COVID‐19 virus, cancer treatment, and anticancer medication delivery systems.
本研究旨在调查线性热辐射和 MHD Casson 三元混合纳米流体在垂直多孔板上流动的影响,以比较纳米流体、混合纳米流体和三元混合纳米流体与牛顿流体和非牛顿流体。我们使用了一种三元混合纳米流体,血液中含有三种氧化物和金属:球形氧化铁(Fe3O4)、板状锌(Zn)和圆柱形金(Au)纳米颗粒。耦合的非线性二元偏微分方程 (PDE) 使用非维量转化为 PDE。然后使用有限差分法(FDM)和扰动法求解 PDE。讨论了不同参数对温度、速度、努塞尔特数和皮肤摩擦曲线的影响。对于纳米流体、混合纳米流体和三混合纳米流体来说,粘度的增加也会导致速度场的增加。在纳米流体、混合纳米流体和三混合纳米流体等三种纳米流体中,三混合纳米流体的性能更好。随着体积分数(Fe3O4)的增加,牛顿流体和非牛顿流体的温度都会升高。温度升高的原因是纳米粒子的导热性,而纳米粒子体积分数的增长估算又增强了纳米粒子的导热性。纳米粒子体积分数估计值越大,流体温度越高。金(Au)的增加也会提高各种形状(圆柱形、血小板形和球形)的温度。在圆柱体、血小板和球形等三种形状中,球形的表现更好。在该模型中,生物医学应用包括抗病毒和治疗、COVID-19 病毒治疗、癌症治疗和抗癌药物输送系统。
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引用次数: 0
Spherical partial differential equation with non‐constant coefficients for modeling of nonlinear unsteady heat conduction in functionally graded materials 用于功能分级材料非线性非稳态热传导建模的非恒定系数球面偏微分方程
Pub Date : 2024-05-25 DOI: 10.1002/zamm.202300725
Amin Amiri Delouei, Amin Emamian, Saeed Ghorbani, Fuli He
The objective of this research paper is to propose an exact solution for resolving the transient conduction in a 2D sphere. The coefficients of governing equation are varied according to the material properties. The thermo‐physical properties are regarded as functions that follow a power‐law relationship concerning the radial direction. Both radial and angular thermal conductivity coefficients change with radius. Thermal boundary conditions are considered in a general state, which can cover different thermal conditions, including Dirichlet, Neumann, and Convection surface conditions. Laplace transform and Meromorphic function methods are used in the solution approach to the current unsteady problem. Two unsteady case studies with complex boundary conditions have been considered to show the credibility of the current solution. The results of both case studies have been successfully validated. The results confirm the high capability of the present solution in solving unsteady thermal problems of functionally graded materials in spherical coordinates.
本研究论文的目的是为解决二维球体中的瞬态传导问题提出一个精确的解决方案。指导方程的系数根据材料特性而变化。热物理性质被视为在径向遵循幂律关系的函数。径向和角向导热系数均随半径变化。热边界条件是在一般状态下考虑的,可以涵盖不同的热条件,包括迪里夏特条件、诺伊曼条件和对流表面条件。在当前非稳态问题的求解方法中,使用了拉普拉斯变换和Meromorphic函数方法。考虑了两个具有复杂边界条件的非稳态案例研究,以显示当前解决方案的可信度。两个案例研究的结果都得到了成功验证。结果证实了当前解决方案在解决球面坐标下功能分级材料的非稳态热问题方面具有很强的能力。
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引用次数: 0
Issue Information: ZAMM 5/2024 发行信息:ZAMM 5/2024
Pub Date : 2024-05-09 DOI: 10.1002/zamm.202402004
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引用次数: 0
An investigation on the torsional vibration of a FG strain gradient nanotube 对 FG 应变梯度纳米管扭转振动的研究
Pub Date : 2024-05-02 DOI: 10.1002/zamm.202301093
Büşra Uzun, Mustafa Özgür Yaylı, Ömer Civalek
In this work, an attention is paid to the prediction of torsional vibration frequencies of functionally graded porous nanotubes based on the Lam strain gradient elasticity theory. The nanotubes are formed of functionally graded porous nanomaterials that vary in the radial direction. This study also aims to obtain the analytical solution of the strain gradient model presented by Lam for torsional vibration response, in a simple manner, for different rigid or restrained boundary conditions. The torsion angle of a functionally graded nanotube is defined by an infinite Fourier series. Then, the Stokes’ transformation is applied to force the boundary conditions to the desired state. An eigenvalue problem is established with the help of the two systems of equations obtained. This eigenvalue problem, which includes deformable springs at both ends of the nanotube, appears as a general analytical solution that can find torsional vibration frequencies. It is shown that the vibrational responses can be significantly influenced by the through‐radius gradings of material, material length scale parameters and deformable springs of the functionally graded nanotubes and consequently can be predicted by giving proper values to torsional spring parameters.
本研究基于拉姆应变梯度弹性理论,对功能分级多孔纳米管的扭转振动频率进行了预测。纳米管由径向变化的功能分级多孔纳米材料构成。这项研究还旨在以一种简单的方式,获得 Lam 提出的应变梯度模型在不同刚性或约束边界条件下的扭转振动响应的解析解。功能分级纳米管的扭转角由无穷傅里叶级数定义。然后,应用斯托克斯变换将边界条件强制到所需状态。借助所得到的两个方程组,可以建立一个特征值问题。这个特征值问题包括纳米管两端的可变形弹簧,是一个可以找到扭转振动频率的通用解析解。研究表明,振动响应会受到功能分级纳米管的材料通径分级、材料长度尺度参数和可变形弹簧的显著影响,因此可以通过给定适当的扭转弹簧参数值来预测振动响应。
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引用次数: 0
On the dynamic Coulomb's frictional contact problem for thermo‐piezoelectric materials 论热压电材料的动态库仑摩擦接触问题
Pub Date : 2024-05-01 DOI: 10.1002/zamm.202300891
Mohammed Alaoui, EL‐Hassan Essoufi, Abdelhafid Ouaanabi, Mustapha Bouallala
In this work, we study, from a variational point of view, a dynamic contact problem between a thermo‐piezoelectric body and a thermally conductive foundation. The normal compliance contact condition and Coulomb's friction law are employed to model the contact. We provide existence and uniqueness results of a weak solution to the model using adequate auxiliary problems, an abstract result on nonlinear first‐order evolution inequalities and Banach fixed point argument. Finally, the continuous dependence of the solution on the surface traction force and the surface electrical charge is studied.
在这项工作中,我们从变分的角度研究了热压电体与导热地基之间的动态接触问题。我们采用法向顺应接触条件和库仑摩擦定律来模拟接触。我们利用适当的辅助问题、非线性一阶演化不等式的抽象结果和巴拿赫定点论证,给出了模型弱解的存在性和唯一性结果。最后,研究了解对表面牵引力和表面电荷的连续依赖性。
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引用次数: 0
Construction and investigation of differential hierarchical models for the Newtonian fluids 牛顿流体微分层次模型的构建与研究
Pub Date : 2024-05-01 DOI: 10.1002/zamm.202300251
George Jaiani
We construct mathematical hierarchical models in Eulerian coordinates for an ideal and a Newtonian viscous fluid flow in the prismatic shell‐like domains. The peculiarities of well‐posedness of boundary conditions for angular domains are discussed.
我们以欧拉坐标为棱柱壳状域中的理想流体和牛顿粘性流体流动构建了数学层次模型。讨论了角域边界条件拟合的特殊性。
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引用次数: 0
On a lack of stability of parametrized BV solutions to rate‐independent systems with nonconvex energies and discontinuous loads 关于具有非凸能量和不连续负载的速率无关系统的参数化 BV 解缺乏稳定性的问题
Pub Date : 2024-04-26 DOI: 10.1002/zamm.202300654
Merlin Andreia, Christian Meyer
We consider a rate‐independent system with nonconvex energy under discontinuous external loading. The underlying space is finite‐dimensional and the loads are functions in . We investigate the stability of various solution concepts w.r.t. a sequence of loads converging weakly* in with a particular emphasis on the so‐called normalized, ‐parametrized balanced viscosity solutions. By means of three counterexamples, it is shown that common solution concepts are not stable w.r.t. weak* and even intermediate (or strict) convergence of loads in the sense that a limit of a sequence of solutions associated with these loads need not be a solution corresponding to the load in the limit. We moreover introduce a new solution concept, which is stable in this sense, but our examples show that this concept necessarily allows “solutions” that are physically meaningless.
我们考虑的是一个与速率无关的系统,它在不连续的外部载荷作用下具有非凸能量。底层空间是有限维的,载荷是 。我们研究了各种解概念在一连串弱*收敛于 的载荷下的稳定性,并特别强调了所谓的归一化、参数化平衡粘性解。通过三个反例,我们发现常见的解概念在弱*甚至中间(或严格)载荷收敛时并不稳定,因为与这些载荷相关的解序列的极限并不一定是与极限载荷相对应的解。此外,我们还引入了一个新的解概念,它在这个意义上是稳定的,但我们的例子表明,这个概念必然允许无物理意义的 "解"。
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引用次数: 0
Numerical simulation of the ferrohydrodynamics flow using an unconditionally stable second‐order scheme 使用无条件稳定的二阶方案对铁流体力学流动进行数值模拟
Pub Date : 2024-04-19 DOI: 10.1002/zamm.202400025
Aytura Keram, Pengzhan Huang
In this paper, we design a decoupled, linear, unconditionally stable and fully discrete numerical scheme for a ferrohydrodynamics system with second‐order temporal accuracy. This scheme is based on a second‐order backward difference formula for time derivative terms and linearization extrapolation for nonlinear terms, which produces a series of decoupled linear equations and solves effectively this nonlinear and multiphysical coupled system. Meanwhile, we show that the scheme is unconditionally stable. Finally, some numerical experiments are provided to verify the theoretical finding and illustrate the accuracy and efficiency of the proposed scheme.
在本文中,我们为铁流体力学系统设计了一种解耦的、线性的、无条件稳定的、完全离散的数值方案,具有二阶时间精度。该方案基于时间导数项的二阶后向差分公式和非线性项的线性化外推法,产生了一系列解耦线性方程,有效地求解了这个非线性和多物理耦合系统。同时,我们还证明了该方案是无条件稳定的。最后,我们提供了一些数值实验来验证理论结论,并说明了所提方案的准确性和高效性。
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引用次数: 0
Polynomial stability for Lord–Shulman porous elasticity with microtemperature and strong time delay 具有微温和强时间延迟的 Lord-Shulman 多孔弹性的多项式稳定性
Pub Date : 2024-04-19 DOI: 10.1002/zamm.202300323
Anderson J. A. Ramos, Anderson L. A. Araujo, Mirelson M. Freitas, Manoel J. Dos Santos, Alberto S. Noé
In this paper, we study a porous thermoelastic system with microtemperature and strong time delay acting on the volume fraction equation. The thermal effect of microtemperature is based on the Lord–Shulman theory (J Mech Phys Solids. 15(5) (1967), 299–309.), while the strong delay is motivated by Makheloufi's et al. recent work (Math Meth Appl Sci. 44 (2021), 6301–6317.). To prove the well‐posedness of the system, lack of exponential stability and the polynomial decay with optimal rate, we use the semigroup theory of linear operators.
本文研究了一个多孔热弹性系统,该系统具有微温度和作用于体积分数方程的强时间延迟。微温的热效应基于 Lord-Shulman 理论(J Mech Phys Solids.15(5)(1967),299-309.),而强延迟则是由 Makheloufi 等人最近的研究成果(Math Meth Appl Sci.为了证明系统的好求解性、缺乏指数稳定性以及多项式衰减的最佳速率,我们使用了线性算子的半群理论。
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引用次数: 0
Analytical analysis of water and engine oil base nanofluid flow with the influence of viscous dissipation and variable viscosity on stretching surface 拉伸表面粘性耗散和可变粘性影响下的水和发动机油基纳米流体流动分析
Pub Date : 2024-04-11 DOI: 10.1002/zamm.202300773
Ali Rehman, Ma Chau Khun, Mustafa Inc, Lakhdar Ragoub, Shahram Rezapour, Taseer Muhammad
In this study, we will look at the analytical characterization of water and motor oil‐based nanofluid flow and the effects of viscous dissipation and variable viscosity on stretching surfaces. The primary goal of this research is to improve heat transfer efficiency in a range of systems, including cooling applications, refrigeration systems, and heat exchangers. The addition of nanoparticles to the base fluid increases its thermal conductivity, which boosts heat transfer rates. The flow system considers the impact of viscous dissipation. In addition, this methodology accounts for temperature and velocity slips during stretching. We utilized the proper transformations to convert a set of PDEs to NLODEs. To solve this system of equations, we use hybrid nanofluid. The impact of different parameters obtained from temperature and velocity equations involving the porosity parameter, power law number, ratio velocity, dynamic viscosity, Forchheimer parameter, and Eckert number input factors are shown in the form of graphs.
在本研究中,我们将探讨水和机油基纳米流体流动的分析特性,以及粘性耗散和可变粘度对拉伸表面的影响。这项研究的主要目标是提高一系列系统的传热效率,包括冷却应用、制冷系统和热交换器。在基础流体中添加纳米粒子可提高其热传导率,从而提高传热率。流动系统考虑了粘性耗散的影响。此外,该方法还考虑了拉伸过程中的温度和速度滑移。我们利用适当的变换将一组 PDE 转换为 NLODE。为了求解这个方程组,我们使用了混合纳米流体。从温度和速度方程中获得的不同参数,包括孔隙度参数、幂律数、速度比、动态粘度、福克海默参数和埃克特数输入因子的影响,以图表的形式显示出来。
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引用次数: 0
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ZAMM - Journal of Applied Mathematics and Mechanics
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