Applied and Computational Mechanics最新文献_第6页

Heat Transfer Enhancement and Boundary Layer Separations for a Hybrid Nanofluid Flow past an Isothermal Cylinder 混合纳米流体通过等温圆柱体的传热增强和边界层分离

Applied and Computational Mechanics Pub Date : 2021-08-03 DOI: 10.22055/JACM.2021.37795.3087

N. C. Roy, A. Akter

{"title":"Heat Transfer Enhancement and Boundary Layer Separations for a Hybrid Nanofluid Flow past an Isothermal Cylinder","authors":"N. C. Roy, A. Akter","doi":"10.22055/JACM.2021.37795.3087","DOIUrl":"https://doi.org/10.22055/JACM.2021.37795.3087","url":null,"abstract":"Unsteady magnetohydrodynamic mixed convection flow of an incompressible hybrid nanofluid (Cu-Al2O3/water) past an isothermal cylinder with thermal radiation effect has been studied. Appropriate non-dimensional variables are initiated to reduce the governing equations into a convenient form. By utilizing the procedure of finite difference, reduced equations are then solved for all time. Besides, series solutions are obtained using perturbation technique for short time and asymptotic method for long time which agree with the acquired numerical solution up to a good accuracy. When the mixed convection parameter Ri, radiation conduction parameter Rd, magnetic field parameter M and the volume fractions of nanoparticles ϕ1 and ϕ2 are increased, the local skin friction coefficient and the local Nusselt number are found to increase. Results revealed that the hybrid nanofluid (Cu-Al2O3/water) enhances the heat transfer about 28.28% in comparison to the Al2O3-water nanofluid and about 51.15% than the pure fluid. Contrary to this, the heat transfer of hybrid nanofluid is augmented about 41.76% than the Cu-water nanofluid and 71.41% than the base fluid. The streamlines and isotherms reveal that higher values of Ri, M and Rd delay the boundary layer separation and accordingly shrink the vortices. Moreover, the thermal boundary layer is thickened for the increment of aforesaid quantities. The surface temperature parameter augments the local skin friction coefficient, however, the reverse characteristic is observed for the local Nusselt number.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47851221","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}

引用次数: 0

A Modified Couple Stress-based Model for the Nonlinear Vibrational Analysis of Nano-disks using Multiple Scales Method 基于耦合应力的纳米圆盘非线性振动多尺度分析模型

Applied and Computational Mechanics Pub Date : 2021-07-26 DOI: 10.22055/JACM.2021.37637.3054

A. Alizadeh, M. Shishesaz, S. Shahrooi, Arash Reza

{"title":"A Modified Couple Stress-based Model for the Nonlinear Vibrational Analysis of Nano-disks using Multiple Scales Method","authors":"A. Alizadeh, M. Shishesaz, S. Shahrooi, Arash Reza","doi":"10.22055/JACM.2021.37637.3054","DOIUrl":"https://doi.org/10.22055/JACM.2021.37637.3054","url":null,"abstract":"In this article, the nonlinear vibrational behavior of a nano-disk was analyzed using the multiple scales method (MSM). The modified couple stress theory was used to consider the small-scale effect via the application of nonlocal parameter. Employing Hamilton's principle, two coupled nonlinear differential equations were derived based on the nonlinear von-Karman strain-displacement relation and the classical plate theory. The Galerkin-based procedure was utilized to obtain a Duffing-type nonlinear ordinary differential equation with a cubic nonlinear term and solved by the application of MSM. The effects of nonlocal parameter, aspect ratio, different boundary conditions, and the nonlinear shift frequencies, were obtained on the overall behavior of the nano-disk. Results indicate that increasing the central dimensionless amplitude of the nano-disk, the nonlinear frequency, and the shift index exhibit an increasing behavior, while the increase in the non-dimensional nonlocal parameter, causes a decrease in the nonlinear frequency ratios and the shift index. Additionally, the increase in h/r increases the effect of dimensionless central amplitude on the nonlinear frequencies ratios. Additionally, comparison of the current results with those previously published in the literature shows good agreements. This indicates that the MSM can ease up the solution, and hence, can be applied to the solution of nonlinear nano-disks with high accuracy.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45618092","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}

引用次数: 4

Analysis of Axisymmetric Vibration of Functionally-Graded Circular Nano-Plate Based on the Integral Form of the Strain Gradient Model 基于应变梯度模型积分形式的功能梯度圆形纳米板轴对称振动分析

Applied and Computational Mechanics Pub Date : 2021-07-21 DOI: 10.22055/JACM.2021.37461.3021

Mortaza Pourabdy, M. Shishesaz, S. Shahrooi, S. A. S. Roknizadeh

{"title":"Analysis of Axisymmetric Vibration of Functionally-Graded Circular Nano-Plate Based on the Integral Form of the Strain Gradient Model","authors":"Mortaza Pourabdy, M. Shishesaz, S. Shahrooi, S. A. S. Roknizadeh","doi":"10.22055/JACM.2021.37461.3021","DOIUrl":"https://doi.org/10.22055/JACM.2021.37461.3021","url":null,"abstract":"In this paper, it is aimed to analyze the linear vibrational behavior of functionally-graded (FG) size-dependent circular nano-plates using the integral form of the non-local strain gradient (NSG) model. The linear axisymmetric vibration of the circular FG nano-plates based on the non-local strain gradient (NSG) model is the focal point of this study. In this regard, the non-local elasticity theory (NET) and strain gradient (SG) models are used in conjunction with Hamilton's principle to obtain the governing equations. Discretization of the obtained governing equations is performed with the help of generalized differential quadrature rule (GDQR) and Galerkin weighted residual method (GWRM). The analysis is focused on the effect of non-local and material parameters, as well as the aspect ratio, heterogeneity index of FG material, different boundary conditions, and frequency number on the overall behavior of nano-plate. On using the Galerkin method, a system of linear differential equations is obtained and solved to determine the natural linear frequencies and mode shapes. The obtained results are then compared with the existing results in the literature. On using the proposed procedure in this paper, the dynamic behavior of nano-plate under different boundary conditions can be well described. In addition, the existing deficiencies in other non-local theories can be eliminated. The results of this investigation can be considered as a turning point in the improvement of theoretical results for achieving a better prediction of vibrational behavior in nanostructures.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48571618","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}

引用次数: 8

Frequency Separation in Architected Structures using Inverse Methods 基于逆方法的体系结构频率分离

Applied and Computational Mechanics Pub Date : 2021-07-16 DOI: 10.22055/JACM.2021.37807.3093

D. Inman, Aishwarya Gunasekar

引用次数: 0

Theoretical Study of Convective Heat Transfer in Ternary Nanofluid Flowing past a Stretching Sheet 三元纳米流体通过拉伸片对流换热的理论研究

Applied and Computational Mechanics Pub Date : 2021-07-07 DOI: 10.22055/JACM.2021.37698.3067

S. Manjunatha, V. Puneeth, B. J. Gireesha, Ali J. Chamkha

引用次数: 73

Two-Solid Deposition in Fluid Column using Immersed Boundary-Lattice Boltzmann Method 浸入式边界-晶格玻尔兹曼法在流体柱中的双固体沉积

Applied and Computational Mechanics Pub Date : 2021-07-01 DOI: 10.22055/JACM.2021.37140.2969

M. R. Arbie, U. Fauzi, F. Latief, E. Mustopa

引用次数: 0

Weighted Dual Approach to an Equivalent Stiffness-based Load Transfer Model for Jacked Open-ended Pile 基于等效刚度的顶顶敞开式桩荷载传递模型的加权双重方法

Applied and Computational Mechanics Pub Date : 2021-07-01 DOI: 10.22055/JACM.2021.37430.3013

N. N. Linh, Ngoc A. Nguyen, Kuu Van Nguyen, D. Nguyen

引用次数: 1

The Dynamics of the Working Body of the Tubular Conveyor with the Chain Drive 链式管式输送机工作体的动力学

Applied and Computational Mechanics Pub Date : 2021-07-01 DOI: 10.22055/JACM.2021.35725.2719

O. Lyashuk, B. Sokil, R. Hevko, V. Aulin, L. Serilko, Y. Vovk, D. Serilko, Andriy Dovbysh

{"title":"The Dynamics of the Working Body of the Tubular Conveyor with the Chain Drive","authors":"O. Lyashuk, B. Sokil, R. Hevko, V. Aulin, L. Serilko, Y. Vovk, D. Serilko, Andriy Dovbysh","doi":"10.22055/JACM.2021.35725.2719","DOIUrl":"https://doi.org/10.22055/JACM.2021.35725.2719","url":null,"abstract":"The theoretical calculations of the dynamics of the conveyor drive chain oscillations for different speeds of bulk material movement as a result of motion internal perturbations have been presented in the article. Resonant oscillations have been studied. It has been established that the amplitude of the transition through the resonance is greater for higher speeds of the conveyor drive chain and the maximum dynamic tension in the chain increases with increasing speed of transportation of bulk material. The dependences of the natural frequency of the system \"drive chain of the conveyor line - grain\" on the parameters of the system and the amplitude, as well as the amplitude of the resonant oscillations of the system on the speed of grain movement have been obtained. The dependence of the resonance amplitude of the system \"conveyor chain drive - grain mass\" on the speed of the drive chain at certain parameters has been determined. Taking into account the obtained theoretical data, an improved construction of a tubular chain conveyor with various working bodies and stand equipment using the Altivar 71 frequency converter for complex tasks of the electric drive from 0.75 to 630 kW has been developed. The experimental researches have been carried out and the dependences for definition of productivity and a rotation moment at transportation by the tubular scraper conveyor on curvilinear routes for loose material (wheat and peas) have been received.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":"7 1","pages":"1710-1718"},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43490442","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}

引用次数: 1

A General Purpose Variational Formulation for Boundary Value Problems of Orders Greater than Two 二阶以上边值问题的一个通用变分公式

Applied and Computational Mechanics Pub Date : 2021-07-01 DOI: 10.22055/JACM.2021.37244.2987

Xuefeng Li

引用次数: 0

Numerical Investigation of Tissue-Temperature Controlled System in Thermal Ablation: A Finite Element Approach 热烧蚀组织温度控制系统的数值研究:有限元方法

Applied and Computational Mechanics Pub Date : 2021-07-01 DOI: 10.22055/JACM.2021.36020.2819

Mridul Sannyal, A. Mukaddes

{"title":"Numerical Investigation of Tissue-Temperature Controlled System in Thermal Ablation: A Finite Element Approach","authors":"Mridul Sannyal, A. Mukaddes","doi":"10.22055/JACM.2021.36020.2819","DOIUrl":"https://doi.org/10.22055/JACM.2021.36020.2819","url":null,"abstract":"In thermal ablation, several techniques of treating infected cell in human tissue are being used by the physicians. Transferring heat to the infected cell is one of them. The purpose of this research is to investigate the tissue-temperature controlled system in thermal ablation and compare with two different point heating processes, namely constant and step heating. For this purpose, the finite element model of Penne’s bio-heat equation has been developed to measure the temperature within the two-dimensional tissue model embedded with a small tumor. The tissue temperature-controlled heating was designed to restrict the healthy tissue temperature below the damage threshold temperature. Using the temperature profile, tissue damage index was measured with the help of Arrhenius rate equation. The results show that the tissue temperature-controlled system reduces the temperature of healthy tissue nearby the infected cell to 40% compare to constant and step point heating. This system keeps the healthy tissue within the threshold value (43oC) up to 1000s when it is 100s for other two techniques. After 200s, healthy tissue nearby the infected cell start to damage for constant and step point heating. But temperature-controlled system always keep the healthy tissue safe. The results of this research conclude the temperature-controlled system a better heating technique to remove the infected cell. The information published in this paper will be helpful for the physicians and bio-medical engineers to treat the infected cell or to design medical equipment.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":"7 1","pages":"1826-1835"},"PeriodicalIF":0.0,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47286721","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}

引用次数: 0