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Impacts of thermally stratified medium on transient convective heat transfer between co‐axial horizontal fixed pipes: Applications of the thermal stratification 热分层介质对同轴水平固定管道间瞬态对流传热的影响:热分层的应用
Pub Date : 2024-07-27 DOI: 10.1002/zamm.202400052
Hossam A. Nabwey, Bakhtawar Bibi, Muhammad Ashraf, Ahmed M. Rashad, Miad Abu Hawsah
Thermal stratification improves coaxial pipe systems’ efficiency and stability. Thermal stratification enables accurate temperature maintenance, reduces thermal stress, optimizes heat transmission performance, and minimizes usage of energy to guarantee the system's long‐term performance. The main aim of the current study is to investigate the impacts of thermal stratification on buoyancy force flow and thermal transmission between coaxial fixed pipes. In the present research, the applications of thermally stratified medium on transient convective heat transfer between two coaxial fixed pipes are studied. A two‐dimensional mathematical formulation in terms of mutually nonlinear partial differential equations is used to analyze the unsteady flow and temperature field between the co‐axial pipes, when the internal pipe is uniformly heated and the outer wall of the external pipe is placed at infinity from the surface of the inner fixed pipe. Flow is assumed along the axial direction of the internal pipe and stationary boundary condition is assumed at the surface of the inner pipe. The coupled equations of the simulated model are solved numerically by applying the Implicit Finite Difference Technique. The computed outcomes in the form of geometrical interpretation are highlighted by using the technically advanced software TECHPLOT‐360. Comprehensive detail of the obtained results for the non‐dimensional parameters included in the flow formulation is predicted for steady state velocity, temperature distribution, time‐dependent surface shearness and time‐dependent energy shearness in results and discussion section of the manuscript. The emphasis is placed on the thermal stratification parameter in the above mentioned chief quantities. From the obtained results, it is predicted that the fluid flow pattern and thermal distribution are both reduced for rising values of the thermal stratification parameter S = 0.001, 0.03, 0.05, and 0.07. Minimum flow and thermal profile are observed at S = 0.07. Further, the amplitude of the time‐dependent surface shearness is uniformly distributed throughout the medium and the amplitude of the time‐dependent energy shearness is reduced effectively for S = 1.0, 5.0, and 10.0.
热分层提高了同轴管道系统的效率和稳定性。热分层可实现精确的温度维持、减少热应力、优化热传递性能并最大限度地减少能源消耗,从而保证系统的长期性能。本研究的主要目的是探讨热分层对同轴固定管道间浮力流和热传导的影响。本研究探讨了热分层介质对两根同轴固定管道间瞬态对流传热的影响。当内部管道被均匀加热,外部管道的外壁距离内部固定管道的表面无穷远时,使用互非线性偏微分方程的二维数学公式来分析同轴管道之间的非稳态流动和温度场。假定流体沿内管轴向流动,内管表面假定有静止边界条件。模拟模型的耦合方程采用隐式有限差分技术进行数值求解。利用技术先进的软件 TECHPLOT-360 对计算结果进行了几何解释。手稿的结果和讨论部分全面详细地预测了流动公式中包含的非尺寸参数的稳态速度、温度分布、随时间变化的表面剪切力和随时间变化的能量剪切力。重点是上述主要量中的热分层参数。根据所得结果预测,当热分层参数 S = 0.001、0.03、0.05 和 0.07 的值上升时,流体流动模式和热分布都会减小。当 S = 0.07 时,流量和热分布均为最小值。此外,当 S = 1.0、5.0 和 10.0 时,随时间变化的表面剪切振幅在整个介质中均匀分布,随时间变化的能量剪切振幅有效减小。
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引用次数: 0
Numerical study of aphron drilling crosser fluids coating layer incorporated blood with zinc oxide (ZnO) nanoparticles injected in esophagus 食道中注入氧化锌(ZnO)纳米颗粒的阿弗龙钻井交叉液涂覆层融入血液的数值研究
Pub Date : 2024-07-25 DOI: 10.1002/zamm.202400313
Noreen Sher Akbar, M. Fiaz Hussain, Taseer Muhammad
This study aims to explore a novel cross model for peristaltic flow, which has not been previously addressed. The focus is on investigating the peristaltic flow of an incompressible nanofluid within a vertically uniform channel. The current model has application in drug delivery, biomedical engineering, lab on chip etc. Utilizing peristaltic flow for drug delivery systems in symmetric channels offers precise control over fluid motion, non‐Newtonian fluids, such as polymer solutions used in drug formulations, exhibit complex flow behavior that can be manipulated through peristaltic pumping mechanisms. This application has the potential to revolutionize targeted drug delivery, enhancing therapeutic efficacy and minimizing side effects. Studying peristaltic flow in symmetric channels for non‐Newtonian fluids offers interdisciplinary insights and innovative applications. Understanding fluid rheology, channel geometry, and peristaltic pumping can lead to novel strategies for fluid control, with implications for healthcare, biotechnology, and materials science advancements. To simplify the complex system of nonlinear partial differential equations governing the flow, we consider long wavelengths and low Reynolds numbers. Subsequently, we employ Shooting methods to solve this system of equations, providing a comprehensive evaluation of the numerical results for key parameters such as velocity, temperature, concentration, and pressure gradient. The findings are presented through graphical representations of significant flow parameters.
本研究旨在探索一种新的蠕动流交叉模型,这是以前从未涉及过的。重点是研究不可压缩纳米流体在垂直均匀通道内的蠕动流动。目前的模型可应用于药物输送、生物医学工程、芯片实验室等领域。非牛顿流体(如药物制剂中使用的聚合物溶液)表现出复杂的流动行为,可通过蠕动泵机制加以控制。这种应用有可能彻底改变靶向给药方式,提高疗效并减少副作用。研究非牛顿流体在对称通道中的蠕动流动可提供跨学科见解和创新应用。对流体流变学、通道几何形状和蠕动泵的了解,可以为流体控制带来新的策略,对医疗保健、生物技术和材料科学的进步具有重要意义。为了简化控制流动的复杂非线性偏微分方程系统,我们考虑了长波长和低雷诺数。随后,我们采用射频方法求解该方程组,并对速度、温度、浓度和压力梯度等关键参数的数值结果进行了全面评估。研究结果将通过重要流动参数的图表形式呈现。
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引用次数: 0
Size‐dependent thermoelastic damping analysis in functionally graded graphene nanoplatelets reinforced composite microplate resonators based on Moore–Gibson–Thompson thermoelasticity 基于摩尔-吉布森-汤普森热弹性的功能分级石墨烯纳米片增强复合微板谐振器中与尺寸相关的热弹性阻尼分析
Pub Date : 2024-07-25 DOI: 10.1002/zamm.202301091
Wei Peng, Ashraf M. Zenkour, Yaru Gao, Xu Zhang, Tianhu He, Yan Li
Graphene nanoplatelets (GPLs) are considered to be a desirable reinforcing nanofillers for nanocomposite materials owing to their superior thermo‐mechanical properties. Meanwhile, thermoelastic damping (TED), as a dominant intrinsic dissipation mechanisms, is a major challenge in optimizing high‐performance micro/nano‐resonators. Nevertheless, the classical TED models fail at the micro/nano‐scale due to without considering the influences of the size‐dependent effect and the thermal lagging effect. The present work focuses on investigating TED analysis of functionally graded (FG) microplate resonators reinforced with GPLs based on the modified coupled stress theory (MCST) and the Moore–Gibson–Thompson (MGT) heat conduction model. Four patterns of GPLs distribution including the UD, FG‐O, FG‐X and FG‐A pattern distributions are taken into account and the effective mechanical properties of the plate‐type nanocomposite are evaluated based on the Halpin–Tsai model. The energy equation and the transverse motion equation in the Kirchhoff microplate model are formulated, and then, the closed‐from analytical solution of TED is solved by complex frequency method. The influences of the various parameters involving the material length‐scale parameter, the thermal phase lag of the heat flux and the total weight fraction of GPLs on the TED are discussed in detail. The obtained results show that the effects of the modified parameter on the TED are pronounced. This results provide a more reasonable theoretical approach to estimate TED in the design of FG microplate resonators reinforced with GPLs with high performance.
石墨烯纳米片(GPLs)因其优异的热机械性能而被认为是纳米复合材料的理想增强纳米填料。同时,热弹性阻尼(TED)作为一种主要的内在耗散机制,是优化高性能微/纳米谐振器的一大挑战。然而,由于没有考虑尺寸相关效应和热滞后效应的影响,经典的 TED 模型在微米/纳米尺度上失效。本研究以修正耦合应力理论(MCST)和摩尔-吉布森-汤普森(MGT)热传导模型为基础,重点研究用 GPL 加固的功能分级(FG)微板谐振器的 TED 分析。考虑了四种 GPL 分布模式,包括 UD、FG-O、FG-X 和 FG-A 模式分布,并基于 Halpin-Tsai 模型评估了平板型纳米复合材料的有效力学性能。建立了 Kirchhoff 微板模型中的能量方程和横向运动方程,然后用复频法求解了 TED 的闭合解析解。详细讨论了材料长度尺度参数、热通量的热相位滞后和 GPL 总重量分数等各种参数对 TED 的影响。结果表明,修改后的参数对 TED 的影响非常明显。这一结果为在设计使用 GPL 增强的高性能 FG 微板谐振器时估算 TED 提供了更合理的理论方法。
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引用次数: 0
Robin and zero‐mass diffusion analysis for radiated unsteady flow of Maxwell nanofluid due to porous stretched regime: Analytical simulations 麦克斯韦纳米流体在多孔拉伸状态下的辐射不稳定流的罗宾和零质量扩散分析:分析模拟
Pub Date : 2024-07-25 DOI: 10.1002/zamm.202300421
Manzoor Ahmad, Sami Ullah Khan, Qudsia Bibi, Muhammad Taj, Iskander Tlili, Faisal Mehmood Butt
Owing to the multidisciplinary applications of nanomaterials, a wide range of research has been conducted on this topic recently. The aim of current research is to analyze the enhancement of heat transfer due to the unsteady flow of Maxwell nanofluid associated with the zero mass thermal constraints. The applications of the radiated phenomenon and magnetic force are contributed to the current flow problem. The analysis is subject to the implementation of Robin and zero‐mass diffusion constraints. A bidirectional moving porous surface endorsed the flow. The appropriate variables are taken for simplifying the system. The homotopy analysis method (HAM) is used to compute the solution procedure. The obtained results are confirmed with already performed studies. It has been observed that the temperature and nanoparticle concentration distributions decrease for higher unsteady parameter values.
由于纳米材料的多学科应用,最近对这一主题进行了广泛的研究。当前研究的目的是分析与零质量热约束相关的麦克斯韦纳米流体的非稳态流动对传热的促进作用。辐射现象和磁力的应用有助于解决当前的流动问题。分析受制于罗宾和零质量扩散约束的实施。一个双向移动的多孔表面认可了流动。采用适当的变量来简化系统。同调分析法(HAM)用于计算求解过程。所得结果与已进行的研究结果相吻合。据观察,当非稳态参数值越高时,温度和纳米粒子浓度分布越小。
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引用次数: 0
Significance of variable thermal conductivity and suction/injection in unsteady MHD mixed convection flow of Casson Williamson nanofluid through heat and mass transport with gyrotactic microorganisms 在卡森-威廉姆森纳米流体的非稳态 MHD 混合对流中,可变导热系数和抽吸/注入对陀螺仪微生物热量和质量传输的影响
Pub Date : 2024-07-23 DOI: 10.1002/zamm.202300501
Abdelmooty Mohamed Abd‐Alla, Esraa N. Thabet, Hany A. Hosham, S. M. M. El‐Kabeir
The present paper explores a two‐dimensional mixed bio‐convective unsteady viscous hydro‐magnetic Casson Williamson nanofluid flow model with heat and mass transport incorporating motile microorganisms towards a stretchy spinning disc. The flow concept is accomplished by rotating a stretched disc with a time‐varying angular velocity. By applying a magnetic field normal to the axial direction, a magnetic interaction is taken into consideration. The Casson Williamson nanofluid contains nanosized particles suspended with swimming motile microorganisms and the rotation of the disc is exhibited by buoyancy forces, thermophoresis, suction/injection, zero mass flux conditions, variable thermal conductivity, Joule heating and so forth. The obtained flow narrating differential equations of the model are transformed into ordinary differential system. This is accomplished by simulating boundary value problems using the shooting technique using the ‘ND‐Solve’ approach included in the Mathematica software (Mathematica 12). The implications of the engaged parameters such as Williamson fluid parameter, Casson fluid (CF) parameter, thermophoresis parameter, Brownian motion parameter and so forth, on both axial and radial velocities, temperature, concentration of nanoparticles and microorganisms are explained by means of graphical and tabular constructions. This paper's validity has been confirmed and its findings align with those of other previously published papers. Furthermore, it is found that both the axial and radial velocity profiles are seen to be diminishing functions of the CF parameter. The identified observation may have theoretical implications for a number of engineering procedures, solar energy systems, biofuel cells and extrusion system improvement. Moreover, this work finds application in micro‐fabrication techniques and the chemical industry.
本文探讨了一种二维混合生物对流非稳态粘性水磁卡逊-威廉姆森纳米流体模型,该模型具有热量和质量传输功能,将运动微生物融入到一个拉伸旋转圆盘中。流动概念是通过以随时间变化的角速度旋转拉伸圆盘来实现的。通过在轴向施加法向磁场,考虑了磁场相互作用。卡森-威廉姆森纳米流体包含悬浮着游动微生物的纳米颗粒,圆盘的旋转受到浮力、热泳、吸力/喷射、零质量通量条件、可变热导率、焦耳热等因素的影响。得到的模型流动微分方程被转换成常微分系统。这是通过使用 Mathematica 软件(Mathematica 12)中的 "ND-Solve "方法,使用射击技术模拟边界值问题来实现的。本文通过图表说明了威廉姆森流体参数、卡森流体(CF)参数、热泳参数、布朗运动参数等参与参数对轴向和径向速度、温度、纳米颗粒和微生物浓度的影响。本文的有效性已得到证实,其研究结果与之前发表的其他论文一致。此外,本文还发现轴向和径向速度曲线都是 CF 参数的递减函数。这一发现可能对许多工程程序、太阳能系统、生物燃料电池和挤压系统的改进具有理论意义。此外,这项工作还可应用于微细加工技术和化学工业。
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引用次数: 0
Exact analysis of hydromagnetic non‐Gray optically thick heat absorbing fluid with nonlinear parabolic ramped conditions 具有非线性抛物线斜坡条件的水磁非灰色光学厚吸热流体的精确分析
Pub Date : 2024-07-22 DOI: 10.1002/zamm.202300451
Rajdeep Bordoloi, Nazibuddin Ahmed, Kalyan Chamuah, Ali J. Chamkha
The article presents a solution to a complex problem involving a transient MHD‐free convective chemically reactive flow. The flow involves a viscous incompressible electrically conducting non‐Gray optically thick fluid moving past a semi‐infinite vertical plate that has suddenly started but is temporarily accelerated. The plate has nonlinear parabolic ramped conditions, and the flow is exposed to thermal radiation, heat absorbing sink, and diffusion‐thermo effect. For the current study, the model fluid being used is moist air. The governing equations are obtained using the Laplace transform technique with the help of the Heaviside step function. This study is the first to consider parabolic ramped motion, temperature and concentration simultaneously. Effects of the pertinent parameters on the Sherwood number and Nusselt number are visualized using 3D surface plotting. Findings of the problem manifest that concentration, temperature, and velocity profiles in case of ramped conditions are less than in isothermal conditions. The rate of heat transfer of mercury is less than oxygen, air, water, and ethanol at a room temperature of 22°C–25°C. The ramped plate has the tendency to augment the heat transfer rate. The present study is of great interest in numerous fields of industry and machine‐building applications.
文章提出了一个涉及瞬态无 MHD 对流化学反应流的复杂问题的解决方案。该流动涉及粘性不可压缩导电非灰色光学厚流体流过半无限垂直板,该板突然启动但暂时加速。板具有非线性抛物线斜坡条件,流动受到热辐射、吸热沉降和扩散-热效应的影响。本次研究使用的模型流体为湿空气。在 Heaviside 阶跃函数的帮助下,利用拉普拉斯变换技术获得了控制方程。本研究首次同时考虑了抛物线斜坡运动、温度和浓度。相关参数对舍伍德数和努塞尔特数的影响通过三维曲面图直观显示。研究结果表明,斜坡运动条件下的浓度、温度和速度曲线小于等温条件下的曲线。在 22°C-25°C 的室温条件下,汞的传热速率低于氧气、空气、水和乙醇。斜板有提高传热速率的趋势。本研究对许多工业和机械制造应用领域具有重大意义。
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引用次数: 0
Rheological effects in peristaltic flow of Prandtl fluid through elliptical duct: A comprehensive analysis 普朗特流体蠕动流经椭圆管道时的流变学效应:综合分析
Pub Date : 2024-07-22 DOI: 10.1002/zamm.202400094
Muhammad Hasnain Shahzad, Aziz Ullah Awan, Sohail Nadeem, N. Ameer Ahammad, Haneen Hamam, Ahmed Alamer, Sidra Shafique
This research venture comprehends a theoretical examination of non‐Newtonian fluid flowing peristaltic via an elliptical channel. Furthermore, the Prandtl fluid method for this elliptic duct problem is thoroughly considered. This mathematical inquiry adopts a non‐Newtonian Prandtl fluid model. A polynomial methodology is used to analyze partial differential equations that appear in nondimensional form and deliver an exact analytical solution for the temperature and velocity profile. This study is the first to utilize a novel order polynomial of degree eight having eleven constants to precisely solve the temperature equation for Prandtl fluid flow via an elliptic domain. A comprehensive graphical analysis is also provided to understand the mathematical conclusions fully. The graphs of the velocity profiles clearly show that the non‐Newtonian effects are more potent along the minor axis of the elliptical duct. The streamlined graphs accentuating the trapping phenomenon show specific closed contours close to the boundary wall of the peristaltic duct.
这项研究对通过椭圆形通道蠕动流动的非牛顿流体进行了理论研究。此外,还全面考虑了针对该椭圆形管道问题的普朗特流体方法。该数学研究采用了非牛顿普朗特流体模型。多项式方法用于分析以非线性形式出现的偏微分方程,并为温度和速度曲线提供精确的解析解。这项研究首次利用具有十一个常数的八度新阶多项式,通过椭圆域精确求解普朗特流体流动的温度方程。为了充分理解数学结论,研究还提供了全面的图形分析。速度剖面图清楚地表明,沿着椭圆形管道的次轴,非牛顿效应更为强烈。突出截留现象的流线型图形显示了靠近蠕动管道边界壁的特定封闭轮廓。
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引用次数: 0
A high‐order numerical method for solving non‐periodic scattering problems in three‐dimensional bi‐periodic structures 求解三维双周期结构非周期性散射问题的高阶数值方法
Pub Date : 2024-07-21 DOI: 10.1002/zamm.202300650
Tilo Arens, Nasim Shafieeabyaneh, Ruming Zhang
In this paper, we focus on scattering of non‐periodic incident fields in three‐dimensional bi‐periodic structures, as they can not be solved by the classical methods used for the quasi‐periodic scattering problems. To solve such non‐periodic scattering problems, the Floquet–Bloch transform, which decomposes the unbounded problem into a family of periodic problems in a bounded unit cell, has been applied together with a numerical method by Lechleiter and Zhang (2017). However, its theoretical result indicates that the computational order is too low. Hence, our aim is to propose a high‐order numerical approach by using the Floquet–Bloch transform. To this end, the first crucial part is to analyze the regularity of the transformed solution with respect to the Floquet parameter. The second challenging part is to propose a high‐order tailor‐made quadrature method adapted to singularities of the transformed solution formed by a finite number of circular arcs. Afterwards, we obtain the error estimation of the proposed numerical approach. Eventually, the accuracy and efficiency of the mentioned approach are revealed by several numerical examples.
本文重点研究三维双周期结构中的非周期性入射场散射问题,因为这些问题无法用准周期散射问题的经典方法解决。为了解决这类非周期性散射问题,Lechleiter 和 Zhang(2017 年)将 Floquet-Bloch 变换与数值方法一起应用,该变换将无界问题分解为有界单元格中的周期性问题族。然而,其理论结果表明计算阶数太低。因此,我们的目标是利用 Floquet-Bloch 变换提出一种高阶数值方法。为此,第一个关键部分是分析变换后的解相对于 Floquet 参数的正则性。第二个具有挑战性的部分是提出一种高阶定制正交方法,以适应由有限数量圆弧形成的变换解的奇异性。随后,我们获得了所提数值方法的误差估计。最后,通过几个数值示例揭示了上述方法的准确性和效率。
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引用次数: 0
A comprehensive study of stability analysis for nonlinear Mathieu equation without a perturbative technique 无需扰动技术的非线性马修方程稳定性分析综合研究
Pub Date : 2024-07-21 DOI: 10.1002/zamm.202400047
Yusry O. El‐Dib
The present research focuses on the challenges engineers face in predicting the behavior of nonlinear vibration systems accurately. The nonperturbative method is highlighted as a solution that provides insights into chaos, bifurcation, resonance response, and stability attributes. Specifically, the study delves into the dynamic analysis of the nonlinear Mathieu equation. The research involves a complex and extensive analytical exploration, transitioning from a nonlinear state to a linear one through various stages. The introduced computational method aims to examine the resonance response of the nonlinear Mathieu equation and offer innovative solutions for the Mathieu–Duffing–type oscillator. The nonperturbative approach remains essential in gaining a deeper understanding of nonlinear vibration systems.
本研究的重点是工程师在准确预测非线性振动系统行为时所面临的挑战。非扰动方法作为一种解决方案,能深入揭示混沌、分岔、共振响应和稳定性属性,因此得到了重点关注。具体而言,该研究深入探讨了非线性马修方程的动态分析。研究涉及复杂而广泛的分析探索,通过不同阶段从非线性状态过渡到线性状态。引入的计算方法旨在研究非线性马修方程的共振响应,并为马修-达芬型振荡器提供创新的解决方案。非微扰方法对于深入理解非线性振动系统仍然至关重要。
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引用次数: 0
Thermal performance analysis of oriented MHD convective flow and entropy production of hybrid nanofluids in a cavity induced by semicircles at different radii ratios 不同半径比的半圆诱导空腔中混合纳米流体的定向 MHD 对流和熵产生的热性能分析
Pub Date : 2024-07-19 DOI: 10.1002/zamm.202400015
Basma Souayeh
The current study numerically treats the magnetic field impacts on the natural convection flow and entropy generation in a square cavity filled with hybrid nanofluid and induced by two isothermally heated semicircles at the bottom and left walls of the cavity. The cavity is filled by hybrid nanofluid (titanium oxide/silver‐water) and oriented under different inclination angles with the applied magnetic field. The simulations in this study were executed via a home‐made code written in the FORTRAN programing language. The numerical methodology considered to solve the coupled equations of continuity, momentum, energy, and entropy generation equations with the associated boundary conditions is the finite volume method and the full multigrid acceleration. Various wake parameters are considered in this research study, namely, the inclination angle of the cavity (α), the magnetic field inclination (γ), the Hartmann number (Ha), the Rayleigh number (Ra), the volume fraction of the hybrid nanofluid (ϕ) and the internal semicircles radii ratio (β). The major findings issued from the impact of these parameters on the fluid flow and heat transfer characteristics reveal that heat transfer and entropy generation are a decreasing function of the Hartmann parameter. Moreover, the total entropy generation is intensified by 85.23% from Ra = 103 to Ra = 106 for Ha = 10, by 85.818% for Ha = 50 and 83.813% for Ha = 100. Besides, the flow magnitude is found decreasing with increasing the radii ratio β of the semicircles. It is also found that optimal heat transfer rates deducted from the variation of average Nusselt number versus Ra for different volume fractions of the hybrid nanoparticles are obtained for the extreme values of the pertinent parameters (β = 1, ϕ = 8%, Ra = 106). Hence, the present work offers a useful tool and a parametric study for the research community and engineers on the design and optimization of thermal management systems used in a variety of industrial applications, such as heat exchangers, nuclear reactors, and energy systems.
本研究以数值方法处理了磁场对充满混合纳米流体的方形空腔中自然对流和熵产生的影响,空腔底部和左侧壁上的两个等温加热半圆诱导了自然对流和熵产生。空腔由混合纳米流体(氧化钛/银-水)填充,并与外加磁场成不同的倾斜角。本研究中的模拟是通过用 FORTRAN 编程语言编写的自制代码执行的。为求解连续性、动量、能量和熵生成方程的耦合方程以及相关的边界条件,采用的数值方法是有限体积法和全多网格加速法。本研究考虑了多种唤醒参数,即空腔倾角 (α)、磁场倾角 (γ)、哈特曼数 (Ha)、瑞利数 (Ra)、混合纳米流体的体积分数 (ϕ) 和内部半圆半径比 (β)。这些参数对流体流动和传热特性的影响得出的主要结论表明,传热和熵的产生是哈特曼参数的递减函数。此外,当哈特曼参数为 10 时,从 Ra = 103 到 Ra = 106,总熵增大了 85.23%;当哈特曼参数为 50 时,总熵增大了 85.818%;当哈特曼参数为 100 时,总熵增大了 83.813%。此外,随着半圆半径比 β 的增大,流动幅度也在减小。研究还发现,在相关参数的极值(β = 1,j = 8%,Ra = 106)下,不同体积分数的混合纳米粒子的平均努塞尔特数对 Ra 的变化可获得最佳传热率。因此,本研究为研究界和工程师设计和优化热管理系统提供了有用的工具和参数研究,这些热管理系统可用于各种工业应用,如热交换器、核反应堆和能源系统。
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引用次数: 0
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ZAMM - Journal of Applied Mathematics and Mechanics
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