Journal of Naval Architecture and Marine Engineering最新文献_第6页

MHD flow due to stretching sheet embedded in non Darcian porous medium with thermal stratification effects 具有热分层效应的非达西多孔介质中拉伸片引起的MHD流动

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2018-06-28 DOI: 10.3329/jname.v15i1.29692

A. Banshiwal, M. Goyal

引用次数: 0

Mathematical analysis of non-Newtonian nanofluid transport phenomena past a truncated cone with Newtonian heating 牛顿加热下非牛顿纳米流体通过截锥传输现象的数学分析

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2018-06-28 DOI: 10.3329/JNAME.V15I1.29966

Nagendra Nallagundla, Ch. Amanulla, M. Reddy

{"title":"Mathematical analysis of non-Newtonian nanofluid transport phenomena past a truncated cone with Newtonian heating","authors":"Nagendra Nallagundla, Ch. Amanulla, M. Reddy","doi":"10.3329/JNAME.V15I1.29966","DOIUrl":"https://doi.org/10.3329/JNAME.V15I1.29966","url":null,"abstract":"In the present study, we analyze the heat, momentum and mass (species) transfer in external boundary layer flow of Casson nanofluid past a truncated cone surface with Biot Number effect is studied theoretically. The effects of Brownian motion and thermophoresis are incorporated in the model in the presence of both heat and nanoparticle mass transfer Biot Number effect. The governing partial differential equations (PDEs) are transformed into highly nonlinear, coupled, multi-degree non-similar partial differential equations consisting of the momentum, energy and concentration equations via. Appropriate non-similarity transformations. These transformed conservation equations are solved subject to appropriate boundary conditions with a second order accurate finite difference method of the implicit type. The influences of the emerging parameters i.e. Casson fluid parameter (?), Brownian motion parameter (Nb) and thermophoresis parameter (Nt), Lewis number (Le), Buoyancy ratio parameter (N ), Prandtl number (Pr) and Biot number (Bi) on velocity, temperature and nano-particle concentration distributions is illustrated graphically and interpreted at length. Validation of solutions with a Nakamura tri-diagonal method has been included. The study is relevant to enrobing processes for electric-conductive nano-materials of potential use in aerospace and other industries.","PeriodicalId":55961,"journal":{"name":"Journal of Naval Architecture and Marine Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2018-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3329/JNAME.V15I1.29966","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48202816","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: 12

Natural convective flow in circular and arc cavities filled with water-cu nanofluid: a comparative study 水-铜纳米流体填充的圆形和弧形腔内自然对流的比较研究

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2018-06-28 DOI: 10.3329/JNAME.V15I1.33549

K. F. U. Ahmed, R. Nasrin, M. Elias

{"title":"Natural convective flow in circular and arc cavities filled with water-cu nanofluid: a comparative study","authors":"K. F. U. Ahmed, R. Nasrin, M. Elias","doi":"10.3329/JNAME.V15I1.33549","DOIUrl":"https://doi.org/10.3329/JNAME.V15I1.33549","url":null,"abstract":"The fluid flow and heat transfer mechanism on steady state solutions obtained in circular and arc-square enclosures filled with water/Cu nanofluid as well as base fluid has been investigated numerically by Galerkin's weighted residual finite element procedure. The left and right boundaries of the cavities are, respectively, heated and cooled at constant temperatures, while their horizontal walls are adiabatic. Effects of buoyancy force (Rayleigh number) and viscous force (Prandtl number) with a wide range of Ra (103 - 106) and Pr (4.2 - 6.2) on heat transfer phenomenon inside cavities are observed. The fluid flow and temperature gradient are shown by streamlines and isotherms patterns. From the investigation, it is reported that the Rayleigh and Prandtl numbers are playing significant role in heat transfer rate. The variation in heat transfer is calculated in terms of average Nusselt number. Heat transfer rate is found to be higher for water/Cu nanofluid with 2% solid volume fraction than pure water. About 2.7% higher heat transfer rate is obtained for circular cavity than that of arc cavity using water/Cu nanofluid at Ra = 104 and Pr = 5.8.","PeriodicalId":55961,"journal":{"name":"Journal of Naval Architecture and Marine Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2018-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3329/JNAME.V15I1.33549","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49185310","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

Ultimate strength formulation of stiffened panels under in-plane compression or tension with cracking damage 带裂纹损伤的平面内压缩或拉伸加筋板的极限强度公式

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2018-06-28 DOI: 10.3329/JNAME.V15I1.31668

M. Zareei, M. Iranmanesh

引用次数: 2

Computational hydrodynamic analysis of a highly skewed marine propeller 大偏斜船用螺旋桨的计算水动力分析

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2018-06-19 DOI: 10.20944/preprints201806.0307.v1

Houari Hussein, K. Boumediene, S. E. Belhenniche, O. Imine, M. Bouzit

{"title":"Computational hydrodynamic analysis of a highly skewed marine propeller","authors":"Houari Hussein, K. Boumediene, S. E. Belhenniche, O. Imine, M. Bouzit","doi":"10.20944/preprints201806.0307.v1","DOIUrl":"https://doi.org/10.20944/preprints201806.0307.v1","url":null,"abstract":" The objective of the current paper is to study the flow around Seiun Maru Highly Skewed (HSP) marine propeller by assessment of blade forces and moments under non-cavitating case. The calculations are performed in open water (steady case) and non-uniform ship wake (Unsteady case). The governing equations based on Reynolds Averaged Navier-Stokes Equation (RANSE) are solved using Finite Volume Method. Ansys Fluent 14.0 is used to implement the simulation. For the steady case, Moving Reference Frame (MRF) is selected while sliding mesh technique is adopted for the unsteady case. Calculated open water performances in terms of thrust and torque coefficients fit very well with experimental data for a wide range of advance ratio. In the unsteady calculations, axial velocities, deduced from the nominal wake, are introduced in the Ansys fluent code. To locate suitably the non-uniform wake in the propeller front plane, three positions of inlet wake have been taken into account to determine their effects on the accuracy of the results. Obtained results show that computed performances are improved compared to panel method when the inlet is close to the propeller. \u0000 ","PeriodicalId":55961,"journal":{"name":"Journal of Naval Architecture and Marine Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2018-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43522369","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: 3

A molecular dynamic study of change in thermodynamic functions of silicon FCC cell with the change in temperature 硅催化裂化电池热力学函数随温度变化的分子动力学研究

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2017-12-28 DOI: 10.3329/JNAME.V14I2.30128

A. Bari, S. Rubaiee, Anas Ahmed, A. Masud

{"title":"A molecular dynamic study of change in thermodynamic functions of silicon FCC cell with the change in temperature","authors":"A. Bari, S. Rubaiee, Anas Ahmed, A. Masud","doi":"10.3329/JNAME.V14I2.30128","DOIUrl":"https://doi.org/10.3329/JNAME.V14I2.30128","url":null,"abstract":"In modern days silicon is being extensively used in making electronic semiconductor-based chips and ICs. In this research, the change in different thermodynamic properties of silicon like lattice heat capacity, molar enthalpy and Debye temperature at constant pressure, with the change in temperature, has been investigated by using molecular dynamics (MD) simulation method. Knowing silicon thermodynamic functions are quite important, because many electronic companies are nowadays trying a lot to reduce the heat generated by their semiconductor chips as excessive heating of the chip not only warms up the device quickly but also reduces the chip life. The results obtained from this simulation help engineers to design electronic chips more efficiently. For simulation Accelrys Materials Studio (Version 5.0) software has been used. The simulation was run for silicon FCC diamond structured cell. The analysis tool used in the simulation is known as CASTEP (Cambridge Sequential Total Energy Package). This tool is specialized for performing molecular level thermodynamic analysis to generate data and graphs for the change in different temperature dependent properties of the molecular system. The interaction between silicon atoms was expressed by the Kohn-Sham potential and MD calculation was conducted on crystalline state of silicon at temperatures between 0 and 1000 K. Here, density function theory (DFT) based tool has been used to derive density of state relations. Results obtained by the simulation were compared with published experimental values and it was found that the simulation results were close to the experimental values.","PeriodicalId":55961,"journal":{"name":"Journal of Naval Architecture and Marine Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2017-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3329/JNAME.V14I2.30128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45705108","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

Numerical analysis of heat and mass transfer along a stretching wedge surface 拉伸楔表面传热传质的数值分析

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2017-12-28 DOI: 10.3329/JNAME.V14I2.30633

M. Ali, M. A. Alim, R. Nasrin, M. Alam

{"title":"Numerical analysis of heat and mass transfer along a stretching wedge surface","authors":"M. Ali, M. A. Alim, R. Nasrin, M. Alam","doi":"10.3329/JNAME.V14I2.30633","DOIUrl":"https://doi.org/10.3329/JNAME.V14I2.30633","url":null,"abstract":"In this work, the effects of dimensionless parameters on the velocity field, thermal field and nanoparticle concentration have been analyzed. In this respect, the magnetohydrodynamic (MHD) boundary layer nanofluid flow along a moving wedge is considered. Therefore, a similarity solution has been derived like Falkner Skan solution and identified the point of inflexion. So the governing partial differential equations transform into ordinary differential equations by using the similarity transformation. These ordinary differential equations are numerically solved using fourth order RungeKutta method along with shooting technique. The present results have been shown graphically and in tabular form. From the graph, the results indicate that the velocity increases with increasing values of pressure gradient, magnetic induction and velocity ratio. The temperature decreases for velocity ratio, Brownian motion and Prandtl number but opposite result arises for increasing values of thermophoresis. The nanoparticle concentration decreases with an increase in pressure gradient, Brownian motion and Lewis number, but increases for thermophoresis. Besides, the solution of nanoparticle concentration exists in the case of Brownian motion is less than 0.2, thermophoresis is less than 0.14 and lewis number is greater than 1.0. Finally, for validity and accuracy the present results have been compared with previous work and found to be in good agreement.","PeriodicalId":55961,"journal":{"name":"Journal of Naval Architecture and Marine Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2017-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3329/JNAME.V14I2.30633","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44673139","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: 9

Numerical simulation of vortex induced vibration in heat exchanger tube bundle at low Reynolds number 低雷诺数下换热器管束涡激振动数值模拟

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2017-12-28 DOI: 10.3329/JNAME.V14I2.25894

Asif Khan, S. Khushnood, N. Saqib, I. Shahid

{"title":"Numerical simulation of vortex induced vibration in heat exchanger tube bundle at low Reynolds number","authors":"Asif Khan, S. Khushnood, N. Saqib, I. Shahid","doi":"10.3329/JNAME.V14I2.25894","DOIUrl":"https://doi.org/10.3329/JNAME.V14I2.25894","url":null,"abstract":"It is sound recognized that when the tube is forced to vibrate or is naturally excited to sufficient amplitudes by flow-induced forces, cyclones peeling phenomena arises at downstream of a tube which clues to vibration in the tube. Two-dimensional numerical recreation model for the computation of flow induced vibration of heat exchanger tube bundle imperiled to cross- flow is proficient in current research. Computational Fluid Dynamics (CFD) tool, GAMBIT (grid generation) and ANSYS FLUENT (fluid flow analysis) are operated during numerical investigations. k-epsilon model is used to solve the Navier Stokes equations. Lift coefficient graph derived from analysis is used to predict the vortex shedding frequency using Fast Fourier Transform (FFT). The results of flow rate, Strouhal number, Reduced velocity, Natural frequency of tube as found from the experimental data has been verified numerically for a Reynolds number range of 4.45 × 104<Re <4.65 × 104 . It is concluded that experimental results are well in agreement with the numerical results.","PeriodicalId":55961,"journal":{"name":"Journal of Naval Architecture and Marine Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2017-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3329/JNAME.V14I2.25894","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43186163","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

Wave interaction with Floating platform of different shapes and supports using BEM approach 基于边界元法的波浪与不同形状和支撑的浮动平台的相互作用

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2017-12-28 DOI: 10.3329/JNAME.V14I2.28267

A. Shirkol, Nasar Thuvanismail

引用次数: 0

Heat and mass transfer with viscous dissipation in horizontal channel partially occupied by porous medium in the presence of oscillatory suction 振荡吸力作用下部分被多孔介质占据的水平通道中具有粘性耗散的传热传质

IF 1.8

Journal of Naval Architecture and Marine Engineering Pub Date : 2017-12-28 DOI: 10.3329/JNAME.V14I2.25584

P. Sharma, R. Saboo

引用次数: 5