Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems最新文献

{"title":"Theoretical analysis of SWCNT- MWCNT/ H 2 O hybrid flow over an upward/downward moving rotating disk","authors":"R. J. P. Gowda, R. Naveenkumar, J. Madhukesh, B. Prasannakumara, R. Gorla","doi":"10.1177/2397791420980282","DOIUrl":"https://doi.org/10.1177/2397791420980282","url":null,"abstract":"The flow-through various disk movement has wide range of applications in manufacturing processes like, computer storage equipment’s, rotating machines, electronic and various types of medical equipment’s. Inspired from these applications, here we scrutinised the consequences of homogeneous-heterogeneous reactions and uniform heat source/sink on the three-dimensional (3D) hybrid SWCNT-MWCNT’s flow on time dependent moving upward/downward rotating disk. The renowned innovation of this paper is the application of the hybrid nanofluid made up of SWCNT and MWCNT’s. Heat generation/absorption effect for the disk that does not move up or down creates a dual flow on the disk. Alternatively, the rotation and upright motion of the disk creates a 3D flow on the surface which has not been considered in the open literature. The modelled PDE’s are reduced in to ODE’s by opting suitable similarity variables and boundary constraints. Here, we used RKF-45 method to obtain the numerical approximations by adopting shooting technique. The analysis of rate of heat transfer is done through graphs. Further, change in velocity, thermal and concentration profiles for various non-dimensional parameters are deliberated briefly and illustrated with the help of suitable plots. The results reveal that, the, rise in values of homogeneous and heterogeneous reaction parameters improve the rate of reaction which results in reduction of the distribution rate and diminishes the concentration gradient. An increase in expansion/contraction parameter enhances the velocity and thermal gradients.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"17 1","pages":"97 - 106"},"PeriodicalIF":6.0,"publicationDate":"2021-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85539673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magneto convective flow of casson nanofluid due to Stefan blowing in the presence of bio-active mixers","authors":"V. Puneeth, S. Manjunatha, B. J. Gireesha, R. Gorla","doi":"10.1177/23977914211016692","DOIUrl":"https://doi.org/10.1177/23977914211016692","url":null,"abstract":"The induced magnetic field for three-dimensional bio-convective flow of Casson nanofluid containing gyrotactic microorganisms along a vertical stretching sheet is investigated. The movement of these microorganisms cause bioconvection and they act as bio-active mixers that help in stabilising the nanoparticles in the suspension. The two forces, Thermophoresis and Brownian motion are incorporated in the Mathematical model along with Stefan blowing. The resulting model is transformed to ordinary differential equations using similarity transformations and are solved using RKF − 45 method. The Velocity, Induced Magnetic field, Temperature, Concentration of Nanoparticles, and Motile density profiles are interpreted graphically. It is observed that the Casson parameter decreases the flow velocity and enhances the temperature, concentration, and motile density profiles and also it is noticed that the blowing enhances the nanofluid profiles whereas, suction diminishes the nanofluid profiles. On the other hand, it is perceived that the rate of heat conduction is enhanced with Thermophoresis and Brownian motion.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"54 1","pages":"83 - 95"},"PeriodicalIF":6.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88117323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Varied layer thickness improves structural properties of YSZ thin film","authors":"Nur Fathirah Mohd Rahimi, Sathiabama T. Thirugnana, S. K. Ghoshal, R. Muhammad","doi":"10.1177/23977914211015854","DOIUrl":"https://doi.org/10.1177/23977914211015854","url":null,"abstract":"In this study, the Yttrium Stabilized Zirconia (YSZ) thin films were deposited on the sapphire substrate (Al2O3) by dip-coating method using simple ethanol-based YSZ suspension. The layer thickness of YSZ films were varied by sintering at 1300°C. Phase change and structural evolution in YSZ films were observed by conducting X-ray diffraction (XRD) analyses. The microstructures and the surface morphology of the deposited films were examined using Atomic Force Microscope (AFM) and Field Emission Scanning Electron Microscope (FESEM). The XRD pattern revealed a phase change from cubic to monoclinic with an increase in YSZ layer thickness. The crystallite size was varied in the range of 9.68–42.98 nm with the changes in the layer thickness. Meanwhile, the AFM image analyses showed a layer thickness-dependent variation in the grain size (205.83–373.77 nm) and the RMS surface roughness (16.72–36.44 nm). The FESEM images of the achieved film exhibited the occurrence of a dense morphology. It was concluded that by controlling the layer thickness of the deposited films, their improved structure and morphology can be achieved.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"10 1","pages":"49 - 54"},"PeriodicalIF":6.0,"publicationDate":"2021-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85775098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Special issue on mathematical and computational modeling of nanoscopic structures","authors":"E. Ghavanloo","doi":"10.1177/2397791421993784","DOIUrl":"https://doi.org/10.1177/2397791421993784","url":null,"abstract":"Nanoscopic structures are small structures formed from a countable number of atoms or molecules. Novel properties and functions are associated with nanoscopic structures due to reduction in their dimensionalities. These small structures have promoted a revolution in science and technology, and they are utilized in making new devices as well as leading to new technologies. Furthermore, Nature has already employed nanoscopic structures to perform vital biological functions. Hence, these exotic structures have occupied the center stage in pure and applied research due to their widespread applications in various fields of nanoscience, nanoengineering, nanotechnology, materials science and technology, medical physics, biomedical engineering, biotechnology, molecular biology and genetics, and neural science and neural engineering. Following this invention, various types of biological and nonbiological nanoscopic structures with various morphologies and functionalities have been discovered, synthesized, and reported during the past four decades. Phenomenological study of nanoscopic structures, either as single isolated structures or as components in nanoscale machines and systems, forms an active research area in applied science and engineering. Understanding the mechanical properties and behavior of a material system at nanoscale level is a necessary requirement for an efficient and accurate design, fabrication and assembly of nanoscale systems, nanomaterials, nanodevices, and nanodrugs. Accordingly, the development of well-understood mathematical and computational frameworks for characterizing the mechanical structure and behavior of the nanoscopic structures is very desirable, and it poses a huge number of challenges for researchers in this field. This Special Issue contains five papers by a number of expert researchers from China, India, Iran, Italy, and Poland. They have presented recent findings in mathematical and computational modeling of various nanoscopic structures with different morphologies. Below, we briefly introduce the papers featured in this Special Issue. In the first paper, size-dependent mechanical properties of twin graphene, a novel 2D planar semiconducting carbon allotrope, have been investigated using Molecular Dynamics simulations. The encapsulation of monocyclic carbon rings inside single-walled carbon nanotubes has investigated using continuum approximation in the second paper. In another paper, size-dependent free-vibration of viscoelastic carbon nanotubes conveying fluid and resting on viscoelastic foundation has studied on the basis of fractional viscoelasticity. Nonlinear bending analysis of a double-layered graphene sheet which contains a geometrical imperfection has simulated in the fourth paper. Finally, the static behavior of elastic curved beams has been investigated by stress-driven two-phase integral elasticity. We hope readers will find the special issue interesting and that the content will contribute to the deve","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"14 1","pages":"3 - 3"},"PeriodicalIF":6.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81985235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stress-driven two-phase integral elasticity for Timoshenko curved beams","authors":"M. S. Vaccaro, F. P. Pinnola, F. M. de Sciarra, M. Čanadija, R. Barretta","doi":"10.1177/2397791421990514","DOIUrl":"https://doi.org/10.1177/2397791421990514","url":null,"abstract":"In this research, the size-dependent static behaviour of elastic curved stubby beams is investigated by Timoshenko kinematics. Stress-driven two-phase integral elasticity is adopted to model size effects which soften or stiffen classical local responses. The corresponding governing equations of nonlocal elasticity are established and discussed, non-classical boundary conditions are detected and an effective coordinate-free solution procedure is proposed. The presented mixture approach is elucidated by solving simple curved small-scale beams of current interest in Nanotechnology. The contributed results could be useful for design and optimization of modern sensors and actuators.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"577 1","pages":"52 - 63"},"PeriodicalIF":6.0,"publicationDate":"2021-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76412205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of ZrO2 nano particles on the behavior of mechanical and tribological properties of the AA7075 composite","authors":"M. Reddy, H. Raju, N. Banapurmath, V. V. Meti","doi":"10.1177/2397791420981525","DOIUrl":"https://doi.org/10.1177/2397791420981525","url":null,"abstract":"A well-known AA7075 alloy used for most of the structural, aerospace, and automobile applications due to its excellent properties such as high strength, corrosion-resistant, and low density. To encourage industrialists, the physical and mechanical properties of the composite has to improve by reinforcing hard ceramic particles. In this investigation varying wt.% of hard ZrO2 (zirconium dioxide) particles (0.75, 1, 1.25, 1.5, 1.75, and 2 wt.%) are reinforced in AA7075 matrix alloy to form a composite. Motorized stir casting technique induced to distribute reinforcement particles homogeneously. The SEM micrographs reveal that uniform distribution of ZrO2 particles can be achieved after inducing motorized stir casting technique into the molten composite. The experimental test results revealed that the addition of ZrO2 particles enhanced the hardness and tensile strength of the AA7075/ZrO2 composite as compared to base matrix material. Among all composites, AA7075/1.5ZrO2 show higher hardness and strength.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"61 1","pages":"55 - 62"},"PeriodicalIF":6.0,"publicationDate":"2020-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90528809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size-dependent mechanical properties of twin graphene","authors":"Fangyan Zhu, Jiantao Leng, Zhengrong Guo, Tienchong Chang","doi":"10.1177/2397791420972553","DOIUrl":"https://doi.org/10.1177/2397791420972553","url":null,"abstract":"Twin Graphene, a novel 2D planar semiconducting carbon allotrope predicted recently, has attracted tremendous attention due to its potential applications in nano electromechanical systems (NEMS). In this paper, we use Molecular Dynamics simulations to investigate the mechanical properties of twin graphene. By performing uniaxial tensile loading, we find that the Young’s modulus, failure stress and fracture strain of a twin graphene sheet are strongly dependent on its size. Rectangular sheets show more apparent anisotropy of mechanical properties than square sheets. Our results also demonstrate that the fracture pattern of twin graphene is dependent on its geometry, as a result of its diverse bond types and orientations. These findings present an in-depth understanding of size dependent mechanical properties of twin graphene, and may benefit its future applications as building blocks of NEMS devices.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"33 1","pages":"4 - 11"},"PeriodicalIF":6.0,"publicationDate":"2020-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81195449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Encapsulation of monocyclic carbon clusters into carbon nanotubes: A continuum modeling approach","authors":"Cheriyacheruvakkara Owais, Mahroof Kalathingal, R. Swathi","doi":"10.1177/2397791420964002","DOIUrl":"https://doi.org/10.1177/2397791420964002","url":null,"abstract":"Carbon clusters are challenging to produce and isolate due to their highly reactive nature. One of the strategies for their isolation is to encapsulate the clusters into carbon nanotubes (CNTs) of appropriate radii. Herein, we have investigated the energetics for the encapsulation of the monocyclic carbon rings, C n ( n = 10 , 12 , 14 , 16 , 18 , 20 , and 22 ) into CNTs of various radii using the continuum approximation. The encapsulation is driven by the non-covalent interactions between the carbon rings and the CNTs. The analyzes of the axial forces and the interaction energies at various orientations and positions of centers of mass of the rings with respect to the CNT axes clearly suggested the role of the tube radius in governing the energetics of encapsulation. Estimation of the acceptance and the suction energies as a function of CNT radius led to the prediction that the CNTs with radii of 5.38 Å, 5.83 Å, 6.25 Å, 6.68 Å, 7.07 Å, 7.51 Å, and 7.90 Å can efficiently encapsulate C10, C12, C14, C16, C18, C20, and C22 rings, respectively. In the limit of large tube radii, the numerical results lead to those obtained for carbon ring adsorption on graphene. Furthermore, the continuum approach enabled us to explore the potential energy surfaces thereby arriving at the equilibrium configurations of the rings inside the CNTs. Such an analysis is invaluable because of the enormous computational cost associated with quantum chemical calculations.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"10 1","pages":"12 - 29"},"PeriodicalIF":6.0,"publicationDate":"2020-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89243937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Molecular dynamics study on the effect of hydrophilicity on thin film evaporation over biphilic surface","authors":"Sudipta Paul, Md. Ragib Rownak, M. Hasan","doi":"10.1177/2397791420946639","DOIUrl":"https://doi.org/10.1177/2397791420946639","url":null,"abstract":"The objective of this study is to understand the effect of surface wettability and how nano-scale heat transfer is affected by different surface wetting conditions over biphilic surface by molecular dynamics simulations. The system of 3 nm liquid Argon film over Platinum surface is equilibrated at 90 K and then wall temperature is raised to higher value to study the effect of temperature. According to this study at low wall temperature and low surface wetting conditions, liquid temperature increases proportionally with the increment of hydrophilic portion but at higher wall temperature and better surface wetting conditions, maximum value of liquid Argon temperature increases with increasing hydrophobic portion. Evaporation number, evaporative mass flux and heat flux increase significantly with slight increment of hydrophilic portion. Inception time decreases with increasing hydrophilic portion and surface wettability. Also, for better surface wetting conditions, average evaporative mass flux is more sensitive to wall temperature and increases significantly at higher wall temperature.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"6 1","pages":"107 - 117"},"PeriodicalIF":6.0,"publicationDate":"2020-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80262811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetohydrodynamic bio-nano-convective slip flow with Stefan blowing effects over a rotating disc","authors":"Fatema Tuz Zohra, M. J. Uddin, Md Faisal Md Basir, A. Ismail","doi":"10.1177/2397791419881580","DOIUrl":"https://doi.org/10.1177/2397791419881580","url":null,"abstract":"Microfluidic-related technologies and micro-electromechanical systems–based microfluidic devices have received applications in science and engineering fields. This article is the study of a mathematical model of steady forced convective flow past a rotating disc immersed in water-based nanofluid with microorganisms. The boundary layer flow of a viscous nanofluid is studied with multiple slip conditions and Stefan blowing effects under the magnetic field influence. The microscopic nanoparticles move randomly and have the characteristics of thermophoresis, and it is being considered that the change in volume fraction of the nanofluid does not affect the thermo-physical properties. The governing equations are nonlinear partial differential equations. At first, the nonlinear partial differential equations are converted to system of nonlinear ordinary differential equations using suitable similarity transformations and then solved numerically. The influence of relevant parameters on velocities, temperature, concentration and motile microorganism density is illustrated and explained thoroughly. This investigation indicated that suction provides a better medium to enhance the transfer rate of heat, mass and microorganisms compared to blowing. This analysis has a wide range engineering application such as electromagnetic micro pumps and nanomechanics.","PeriodicalId":44789,"journal":{"name":"Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems","volume":"1 1","pages":"83 - 97"},"PeriodicalIF":6.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88659750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}