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Free convective heat transfer in Jeffrey fluid with suspended nanoparticles and Cattaneo–Christov heat flux 悬浮纳米颗粒与Cattaneo-Christov热通量在Jeffrey流体中的自由对流换热
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-05-04 DOI: 10.1177/2397791420912628
B. Vasu, A. Ray, R. Gorla
Free convection flow of Jeffrey nanofluid past a vertical plate with sinusoidal variations of surface temperature and species concentration is presented. The study of heat transfer and nanofluid transport has been done by employing Cattaneo–Christov heat flux model and Buongiorno model, respectively. Equations governing the flow are non-dimensionalized using appropriate transformations. Furthermore, the method of local similarity and local non-similarity is used to reduce the equations into non-linear coupled system of equations which are then solved by homotopy analysis method. The obtained results are validated by comparing with the existing results available in the literature. The numerical results are found to be in good agreement. The effects of varying the physical parameters such as Deborah Number, Prandtl number, Schmidt number, thermophoresis parameter, Brownian motion parameter and buoyancy ratio parameter are obtained and presented graphically. The effect of sinusoidal variation of surface temperature and species concentration on the skin friction coefficient, Nusselt number and Sherwood number is also shown. Velocity for Jeffrey nanofluid is more than the Newtonian nanofluid while temperature and nanoparticle concentration for Jeffrey nanofluid is less than the Newtonian nanofluid. Raising value of thermal relaxation times leads to an increase in the heat transfer coefficient. It is observed that temperature of Cattaneo–Christov heat flux model is less than that in classical Fourier’s model away from the vertical wall. These types of boundary layer flow problems are found in vertical film solar energy collector, grain storage, transportation and power generation, thermal insulation, gas production, petroleum resources, geothermal reservoirs.
研究了杰弗里纳米流体在垂直板上的自由对流流动及其表面温度和物质浓度的正弦变化。分别采用Cattaneo-Christov热流密度模型和Buongiorno热流密度模型对纳米流体的传热和输运进行了研究。控制流的方程使用适当的转换是无量纲化的。在此基础上,利用局部相似和局部非相似的方法,将方程简化为非线性耦合方程组,再用同伦分析法求解。通过与已有文献结果的比较,验证了所得结果的正确性。数值计算结果与计算结果吻合较好。得到了不同物理参数(如Deborah Number、Prandtl Number、Schmidt Number、热泳参数、布朗运动参数和浮力比参数)的影响,并给出了图形。并给出了表面温度和物种浓度的正弦变化对表面摩擦系数、努塞尔数和舍伍德数的影响。杰弗里纳米流体的速度大于牛顿纳米流体,而温度和纳米颗粒浓度小于牛顿纳米流体。热松弛时间的增大导致换热系数的增大。观察到,在远离垂直壁面的地方,Cattaneo-Christov热通量模型的温度比经典傅立叶模型的温度要低。这类边界层流动问题存在于垂直薄膜太阳能集热器、粮食储运发电、保温隔热、采气、石油资源、地热储层等领域。
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引用次数: 5
Nanoparticle shape effect on the thermal behaviour of moving longitudinal porous fin 纳米颗粒形状对移动纵向多孔翅片热性能的影响
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-05-02 DOI: 10.1177/2397791420915139
B. J. Gireesha, G. Sowmya, R. Gorla
A numerical examination of nanoliquid flow over a longitudinal porous fin moving with constant speed is undertaken in the current study. Nickel alloy is used as a nanoparticle, and engineered fluid HFE 7100 is used as a based fluid. In addition, various shapes of nanoparticles like sphere, disc and needle shapes are considered. The generated ordinary differential equation has been nondimensionalized and integrated by using the Runge–Kutta–Fehlberg method. The influence of suitable parameters on the enhancement of heat transfer has been discussed with the help of plotted graphs. Also, the influence of diverse shaped nanoparticle is analysed mathematically. It is found that sphere shaped nanoparticles show better transfer of heat than the disc and needle shapes.
本文对纳米液体在等速运动的纵向多孔翅片上的流动进行了数值模拟。镍合金被用作纳米颗粒,工程流体HFE 7100被用作基流体。此外,还考虑了各种形状的纳米颗粒,如球形、圆盘状和针状。对生成的常微分方程进行了无因次化处理,并用龙格-库塔-费贝格方法进行了积分。本文还通过作图讨论了合适的参数对强化传热的影响。同时,从数学上分析了不同形状纳米颗粒的影响。结果表明,球形纳米颗粒的传热性能优于圆盘状和针状纳米颗粒。
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引用次数: 15
Investigation of biological mechanisms during flow of nano-Bingham–Papanastasiou fluid through a diseased curved artery 纳米bingham - papanastasiou流体通过病变弯曲动脉的生物学机制研究
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-04-13 DOI: 10.1177/2397791420911265
F. Sultan, N. A. Khan, M. I. Afridi
This study aims to explore the biological flow mechanisms in a diseased curved artery during the flow of nano-Bingham–Papanastasiou fluid. The occurrence of stenosis and aneurysm is common in the arterial system, caused by narrowing or dilation of arteries owing to the development of abnormal tissues such as atherosclerotic plaques. The growth of these cells into the lumen of the artery disturbs the flow through the artery. For the treatments of hematological diseases and manufacturing nanoscale biomedical devices, nanofluids are very effective and gaining a lot of attention. In this study, Buongiorno’s nanofluid model is used for nanoscale effects and Bingham–Papanastasiou fluid is employed to study the hemodynamic rheology. An appropriate geometric expression is formulated to project two diseased segments in a curved artery. The coupled nonlinear partial differential equations are formulated for the case of mild stenosis. To solve the governing equations, an explicit finite difference scheme is used. The biological flow mechanisms are depicted through graphs, and flow patterns are presented for important flow parameters.
本研究旨在探讨纳米bingham - papanastasiou液体在病变弯曲动脉内流动的生物学机制。狭窄和动脉瘤的发生在动脉系统中很常见,这是由于动脉粥样硬化斑块等异常组织的发展导致动脉狭窄或扩张造成的。这些细胞在动脉腔内的生长扰乱了通过动脉的血流。在血液疾病的治疗和纳米生物医学器件的制造方面,纳米流体非常有效,受到了广泛的关注。本研究采用Buongiorno纳米流体模型研究纳米级效应,采用Bingham-Papanastasiou流体研究血流动力学流变学。一个适当的几何表达式是制定投影两个病变段在弯曲的动脉。在轻度狭窄情况下,建立了耦合非线性偏微分方程。为了求解控制方程,采用了显式有限差分格式。通过图形描述了生物流动机理,并给出了重要流动参数的流动模式。
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引用次数: 8
Effects of nano-engineered surfaces on osteoblast adhesion, growth, differentiation, and apoptosis 纳米工程表面对成骨细胞粘附、生长、分化和凋亡的影响
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-03-01 DOI: 10.1177/2397791419886778
R. Miralami, J. Sharp, F. Namavar, Curtis W. Hartman, K. Garvin, G. Thiele
Modifying implant surfaces to improve their biocompatibility by enhancing osteoblast activation, growth, differentiation, and induction of greater bone formation with stronger attachments should result in improved outcomes for total joint replacement surgeries. This study tested the hypothesis that nano-structured surfaces, produced by the ion beam-assisted deposition method, enhance osteoblast adhesion, growth, differentiation, bone formation, and maturation. The ion beam-assisted deposition technique was employed to deposit zirconium oxide films on glass substrates. The effects of the ion beam-assisted deposition technique on cellular functions were investigated by comparing adhesion, proliferation, differentiation, and apoptosis of the human osteosarcoma cell line SAOS-2 on coated versus uncoated surfaces. Ion beam-assisted deposition nano-coatings enhanced initial cell adhesion assessed by the number of 4′,6-diamidino-2-phenylindole–stained nuclei on zirconium oxide nano-coated surfaces compared to glass surfaces. This nano-modification also increased cell proliferation as measured by mitochondrial dehydrogenase activity. Moreover, the ion beam-assisted deposition technique improved cell differentiation as determined by the formation of mineralized bone nodules and by the rate of calcium deposition, both of which are in vitro indicators of the successful bone formation. However, programmed cell death assessed by Annexin V staining and flow cytometry was not statistically significantly different between nano-surfaces and glass surfaces. Overall, the results indicate that nano-crystalline zirconium oxide surfaces produced by the ion beam-assisted deposition technique are superior to uncoated surfaces in supporting bone cell adhesion, proliferation, and differentiation. Thus, surface properties altered by the ion beam-assisted deposition technique enhanced bone formation and may increase the biocompatibility of bone cell–associated surfaces.
通过增强成骨细胞的激活、生长、分化和诱导更大的骨形成和更强的附着体来改善种植体表面以提高其生物相容性,可以改善全关节置换术的结果。本研究验证了一种假设,即通过离子束辅助沉积方法产生的纳米结构表面可以增强成骨细胞的粘附、生长、分化、骨形成和成熟。采用离子束辅助沉积技术在玻璃衬底上沉积氧化锆薄膜。通过比较离子束辅助沉积技术对人骨肉瘤细胞系SAOS-2在涂膜和未涂膜表面的粘附、增殖、分化和凋亡的影响,研究了离子束辅助沉积技术对细胞功能的影响。与玻璃表面相比,离子束辅助沉积纳米涂层增强了氧化锆纳米涂层表面上4′,6-二氨基-2-苯基吲哚染色细胞核的数量。这种纳米修饰也增加了线粒体脱氢酶活性的细胞增殖。此外,离子束辅助沉积技术通过矿化骨结节的形成和钙沉积的速率来改善细胞分化,这两者都是成功骨形成的体外指标。然而,通过Annexin V染色和流式细胞术评估的程序性细胞死亡在纳米表面和玻璃表面之间没有统计学上的显著差异。总之,研究结果表明,离子束辅助沉积技术制备的纳米氧化锆表面在支持骨细胞粘附、增殖和分化方面优于非涂层表面。因此,离子束辅助沉积技术改变的表面特性增强了骨的形成,并可能增加骨细胞相关表面的生物相容性。
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引用次数: 0
The impact of the Marangoni convection and magnetic field versus blood-based carbon nanotube nanofluids 马兰戈尼对流和磁场对血液基碳纳米管纳米流体的影响
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-03-01 DOI: 10.1177/2397791419872892
T. Gul, R. Akbar, Zafar Zaheer, I. Amiri
The mutual result of the magnetic field and Marangoni convection against the thin liquid film of Casson fluid, blood-based carbon nanotube nanofluid has been fruitfully discussed in this article. The influence of various model constraints is focused on velocity, heat transfer, pressure distribution, skin friction and Nusselt number through graphical illustration. In addition, we witness that the thermal field of liquid raises with the growing value of φ and this upsurge is more in single-walled carbon nanotubes and is more dominant than multi-walled carbon nanotubes. The controlling approach of the homotopy analysis method has been used for velocity and temperature distribution. For authentication, the achieved results have been associated with the numerical (ND-Solve) method and displayed. This investigation shows that the velocity profile in the case of Casson fluid single-walled carbon nanotube–blood nanofluid is comparatively less affected and the temperature field of single-walled carbon nanotube–blood nanofluid dominates multi-walled carbon nanotube–blood nanofluid.
本文对磁场和马兰戈尼对流作用于卡森流体的薄液膜——血基碳纳米管纳米流体的相互作用结果进行了卓有成效的讨论。通过图形说明,着重讨论了各种模型约束对速度、传热、压力分布、表面摩擦和努塞尔数的影响。此外,我们还看到液体的热场随着φ值的增大而升高,并且这种升高更多地发生在单壁碳纳米管中,并且比多壁碳纳米管更具优势。采用同伦分析法控制速度和温度分布。为了验证,已获得的结果已与数值(ND-Solve)方法相关联并显示。研究表明,卡森流体单壁碳纳米管-血纳米流体的速度分布受影响较小,单壁碳纳米管-血纳米流体的温度场优于多壁碳纳米管-血纳米流体。
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引用次数: 13
A space structural mechanics model of silicene 硅烯的空间结构力学模型
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-03-01 DOI: 10.1177/2397791420905237
M. Motamedi
The two-dimensional nanostructures such as graphene, silicene, germanene, and stanene have attracted a lot of attention in recent years. Many studies have been done on graphene, but other two-dimensional structures have not yet been studied extensively. In this work, a molecular dynamics simulation of silicene was done and stress–strain curve of silicene was obtained. Then, the mechanical properties of silicene were investigated using the proposed structural molecular mechanics method. First, using the relations governing the force field and the Lifson–Wershel potential function and structural mechanics relations, the coefficients for the BEAM elements was determined, and a structural mechanics model for silicene was proposed. Then, a silicene sheet with 65 Å × 65 Å was modeled, and Young’s modulus of silicene was obtained. In addition, the natural frequencies and mode shapes of silicene were calculated using finite element method. The results are in good agreement with reports by other papers.
石墨烯、硅烯、锗烯、斯坦烯等二维纳米结构近年来引起了人们的广泛关注。对石墨烯的研究很多,但对其他二维结构的研究还不够广泛。本文对硅烯进行了分子动力学模拟,得到了硅烯的应力-应变曲线。然后,采用本文提出的结构分子力学方法对硅烯的力学性能进行了研究。首先,利用控制力场的关系、Lifson-Wershel势函数和结构力学关系,确定了BEAM单元的系数,并提出了硅烯的结构力学模型;然后,对尺寸为65 Å × 65 Å的硅烯薄片进行建模,得到了硅烯的杨氏模量。此外,用有限元法计算了硅烯的固有频率和振型。研究结果与其他文献的报道基本一致。
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引用次数: 6
Examining the role of hexagonal boron nitride nanoparticles as an additive in the lubricating oil and studying its application 考察了六方氮化硼纳米颗粒作为润滑油添加剂的作用,并对其应用进行了研究
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-03-01 DOI: 10.1177/2397791420911811
Sangharatna M. Ramteke, H. Chelladurai
Lubricating oil plays an important role in minimizing the friction and wear of many mechanical systems. The additives present in the conventional lubricant are inadequate to reduce the friction and wear of today’s mechanical systems. However, the use of these additives has a significant effect on the environment due to their fast chemical degradation. In recent years, nanoparticle-based lubricant has attracted great attention due to their friction reduction behavior. Therefore, it is of great importance to examine the role of nanoparticle addition in the conventional lubricant and its influence on the tribological characteristics of the mechanical systems. Hence, this research work focused on the formulation of hexagonal boron nitride nanoparticle-based nanofluids and its effect on the tribological characteristics of cylinder liner and piston rings of a realistic diesel engine. The different concentrations of hBN nanoparticle-based nanofluids were formulated and characterized using the ultraviolet–visible spectroscopy and the thermal gravimetric analysis. The results of the experimental analysis showed that hBN nanoparticles as an additive in the lubricating oil exhibited better anti-wear and friction reduction behavior than the conventional base oil 20W40.
润滑油在减少许多机械系统的摩擦和磨损方面起着重要作用。传统润滑剂中的添加剂不足以减少当今机械系统的摩擦和磨损。然而,由于这些添加剂的快速化学降解,它们的使用对环境产生了重大影响。近年来,纳米颗粒基润滑剂因其摩擦减量特性而受到广泛关注。因此,研究纳米颗粒在常规润滑剂中的作用及其对机械系统摩擦学特性的影响具有重要意义。因此,本文主要研究了六方氮化硼纳米颗粒纳米流体的制备及其对柴油机缸套和活塞环摩擦学特性的影响。制备了不同浓度的hBN纳米颗粒基纳米流体,并用紫外可见光谱和热重分析对其进行了表征。实验分析结果表明,hBN纳米颗粒作为润滑油添加剂比常规基础油20W40具有更好的抗磨减摩性能。
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引用次数: 16
Effects of chemical reaction and activation energy on a Carreau nanoliquid past a permeable surface under zero mass flux conditions 零质量通量条件下化学反应和活化能对卡罗纳米液体通过可渗透表面的影响
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-03-01 DOI: 10.1177/2397791419881090
G. Ramesh, K. G. Kumar, Ali J. Chamkha, R. Gorla
Arrhenius condition has been broadly utilized as a model of the temperature impact on the rate compound responses and organic procedure. Hence, our aim of this article is to examine the effects of chemical reaction and activation energy on a Carreau nanoliquid in a permeable surface. For thermal and mass transport curiosities, the cumulative upgrade of convective type condition and zero mass transition have been considered. The overseeing sets of partial differential equations are rendered into coupled nonlinear ordinary differential equations. The arrangement of the subsequent ordinary differential equations is acquired with the assistance of the Runge-Kutta-Fehlberg-fourth-fifth order (RKF-45) procedure. The influence of relevant parameters and physical quantities is investigated. The results show that the presence of reaction rate and energy activation term decelerates the temperature and concentration gradients.
Arrhenius条件已被广泛用作温度对速率、化合物反应和有机过程影响的模型。因此,我们这篇文章的目的是研究化学反应和活化能对可渗透表面上的卡罗纳米液体的影响。对于热输运和质量输运好奇心,考虑了对流型条件的累积升级和零质量转变。将偏微分方程的监督集转化为耦合的非线性常微分方程。利用runge - kutta - fehlberg -4 - 5阶(RKF-45)程序,得到了后续常微分方程的排布。研究了相关参数和物理量的影响。结果表明,反应速率和能量激活项的存在减缓了温度梯度和浓度梯度。
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引用次数: 4
Theoretical investigation of porous hydrostatic journal bearing under micropolar fluid lubrication 微极流体润滑下多孔静压滑动轴承的理论研究
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2020-03-01 DOI: 10.1177/2397791420905236
B. Bhattacharjee, P. Chakraborti, Kishan Choudhuri
The features of micropolar fluid (a non-Newtonian fluid)–lubricated short single-layered porous hydrostatic journal bearing are analyzed theoretically by an iterative method. To investigate hydrostatic journal bearing characteristics, a modified Reynolds equation in the case of micropolar fluid is derived and solved numerically. The obtained results in this work are validated by comparing the same with previously published results with Newtonian and non-Newtonian lubricants in the form of design charts. The static stiffness and load-carrying capacity of the investigated bearing are 80% and 75% higher than conventional hydrostatic bearings. The porous hydrostatic journal bearing exhibits more economical performance as it requires 40% low flow rate and low pump power, and it generates 50% less heat in contrast with other hydrostatic bearings.
采用迭代法对微极流体(非牛顿流体)润滑短层多孔静压滑动轴承的特性进行了理论分析。为了研究静压滑动轴承的特性,推导了微极流体情况下的修正雷诺方程,并对其进行了数值求解。通过与先前发表的牛顿和非牛顿润滑油的结果进行比较,以设计图的形式验证了本工作的结果。所研究的轴承的静刚度和承载能力分别比常规静压轴承高80%和75%。多孔静压滑动轴承具有较好的经济性,因为它需要40%的低流量和较低的泵功率,并且与其他静压滑动轴承相比,它产生的热量减少了50%。
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引用次数: 10
Fully developed magnetohydrodynamics natural convection flow in a vertical micro-porous-channel with Hall effects 具有霍尔效应的垂直微孔通道中磁流体力学的充分发展
IF 6 Q2 NANOSCIENCE & NANOTECHNOLOGY Pub Date : 2019-08-03 DOI: 10.1177/2397791419863596
B. Jha, P. Malgwi, B. Aina
An exact solution is presented for the steady hydromagnetic fully developed natural convection flow in a vertical microporous channel due to asymmetric heating. The governing momentum and energy equations are presented in dimensionless form and solved analytically using the method of undetermined coefficient. The effects of Hall current and suction/injection parameters on the primary and secondary velocity, volume flow rates, and skin frictions are discussed with the help of line graphs and tables. It is observed that injection accelerates the flow, whereas suction retards the flow in both the primary and secondary flow directions.
给出了垂直微孔通道中由于不对称加热而形成的稳定磁完全自然对流的精确解。控制动量和能量方程以无因次形式提出,并采用待定系数法进行解析求解。利用折线图和表格讨论了霍尔电流和吸注参数对初级和次级速度、体积流量和表面摩擦力的影响。观察到,在一次流和二次流方向上,注射加速了流动,而吸力减慢了流动。
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引用次数: 7
期刊
Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems
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