检索结果-南通市图书馆

Lattice Boltzmann method formulation for simulation of thermal radiation effects on non-Newtonian Al_(2)O_(3) free convection in entropy determination

引用

Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 1085-1106页

作者： M.NEMATI M.SEFID A.KARIMIPOUR a.j.chamkha Faculty of Mechanical Engineering Yazd UniversityYazd ***Iran Department of Mechanical Engineering Najafabad BranchIslamic Azad UniversityNajafabad ***Iran Faculty of Engineering Kuwait College of Science and TechnologyDoha 35004Kuwait

The simultaneous investigation on the parameters affecting the flow of electrically conductive fluids such as volumetric radiation,heat absorption,heat generation,and magnetic field(MF)is very vital due to its existence in various sectors of industry and *** present research focuses on mathematical modeling to simulate the cooling of a hot component through power-law(PL)nanofluid convection *** temperature reduction of the hot component inside a two-dimensional(2D)inclined chamber with two different cold wall shapes is *** formulation of the problem is derived with the lattice Boltzmann method(LBM)by code writing via the FORTRAN *** variables such as the radiation parameter(0–1),the Hartmann number(0–75),the heat absorption/generation coefficient(−5–5),the fluid behavioral index(0.8–1.2),the Rayleigh number(103–105),the imposed MF angle(0°–90°),the chamber inclination angle(−90°–90°),and the cavity cold wall shape(smooth and curved)are *** findings indicate that the presence of radiation increases the mean Nusselt number value for the shear-thickening,Newtonian,and shear thinning fluids by about 6.2%,4%,and 2%,*** most cases,the presence of nanoparticles improves the heat transfer(HT)rate,especially in the cases where thermal conduction dominates *** is the lowest cooling performance index and MF effect for the cavity placed at an angle of 90°.The application in the design of electronic coolers and solar collectors is one of the practical cases of this numerical research.

关键词： thermal performance analysis heat absorption/generation power-law(PL)Al_(2)O_(3)nanofluid magnetohydrodynamics natural convection volumetric radiation inclined cavity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimal treatment of stratified Carreau and Casson nanofluids flows in Darcy-Forchheimer porous space over porous matrix

引用

Applied Mathematics and Mechanics(English Edition) 2020年第11期41卷 1651-1670页

作者： R.KUMAR R.KUMAR S.A.SHEHZAD a.j.chamkha Department of Mathematics Central University of Himachal PradeshDharamshala 273001India Department of Mathematics COMSATS University IslamabadSahiwal 57000Pakistan Institute of Research and Development Duy Tan UniversityDa Nang 550000Vietnam Institute of Theoretical and Applied Research(ITAR) Duy Tan UniversityHanoi 100000Vietnam

A comparative three-dimensional(3D)analysis for Casson-nanofluid and Carreau-nanofluid flows due to a flat body in a magnetohydrodynamic(MHD)stratified environment is *** is estimated to be suspended in a Darcy-Forchheimer *** and Dufour responses are also accommodated in the flow field.A moving(rotating)coordinate system is exercised to examine the bidirectionally stretched flow fields(flow,heat transfer,and mass transfer).Nanofluid is compounded by taking ethylene glycol/sodium alginate as base fluid and ferric-oxide(Fe3O4)as *** equations are handled by the application of optimal homotopy asymptotic method(OHAM),where convergence parameters are optimized through the classical least square *** novel mechanism(hidden physics)due to appearing parameters is explored with the assistance of tabular and graphical *** reveal the double behavior state for temperature field with thermal stratification/Dufour number,and for concentration field with Soret number due to the presence of turning points.

关键词： thermal-solutal stratification Soret-Dufour effect Casson-Carreau nanofluid model porous matrix

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of velocity and thermal wall slip on magnetohydrodynamics(MHD)boundary layer viscous flow and heat transfer of a nanofluid over a non-linearly-stretching sheet:a numerical study

引用

Propulsion and Power Research 2018年第2期7卷 182-195页

作者： Dodda Ramya R.Srinivasa Raju j.Anand Rao a.j.chamkha Department of Mathematics University College of ScienceOsmania UniversityHyderabad 500007Telangana StateIndia Department of Engineering Mathematics GITAM UniversityHyderabad CampusRudraram 502329Medak(Dt)Telangana StateIndia Mechanical Engineering Department Prince Mohammad Bin Fahd UniversityP.O.Box 1664Al-Khobar 31952Saudi Arabia

In this analysis,the boundary layer viscous flow of nanofluids and heat transfer over a non-linearly-stretching sheet in the presence of a magnetic field is *** and thermal slip conditions are considered instead of no slip conditions at the boundary.A similarity transformation set is used to transform the governing partial differential equations into non-linear ordinary differential *** reduced equations are solved numerically using the Keller box *** influence of the governing parameters on the dimensionless velocity,temperature,nanoparticle concentration as well as the skin friction coefficient,Nusselt number,and local Sherwood number are *** is found that as the velocity slip parameter increases,the velocity profile is decreased and the skin friction and heat transfer decreased while the mass transfer is *** the thermal slip parameter causes decreases in the heat and mass transfer *** results are presented in both graphical and tabular forms.

关键词： Magnetogydrodynamics(MHD) Nanofluid Non-linearly stretching sheet Velocity slip Thermal slip

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Interaction of Radiation and Turbulent Natural Convection:A Pseudo-Direct Numerical Study

引用

Advances in Applied Mathematics and Mechanics 2022年第6期14卷 1567-1586页

作者： Alexander Nee Ali j.chamkha Research and Educational Center of I.N.Butakov National Research Tomsk Polytechnic UniversityTomskRussia Faculty of Engineering Kuwait College of Science and TechnologyDoha DistrictKuwait

This paper presents a hybrid lattice Boltzmann solver for turbulent buoyancy-driven flow coupled with surface thermal *** two-relaxation time scheme for the Boltzmann equation combined with the implicit finite difference scheme for the energy equation is implemented to compute the heat transfer and fluid flow *** accuracy and robustness of the hybrid approach proposed in this study are assessed in terms of the numerical and experimental data of other *** performing the simulation,the Rayleigh number is ranged from 108 to 1010 whereas the surface emissivity is changed from zero to *** computations,it is found that the overall temperature of the cavity is increased as a result of enhancing the surface *** plumes are formed both at the isothermal and the thermally-insulated walls with the Ra109 and#*** the conditions under study,the overall heat transfer rate is raised by around 5%when taking into account the surface thermal radiation.

关键词： Pseudo-direct numerical simulation surface radiation hybrid lattice Boltzmann scheme turbulent natural convection.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CFD-Based Simulation and Analysis of Hydrothermal Aspects in Solar Channel Heat Exchangers with Various Designed Vortex Generators

引用

Computer Modeling in Engineering & Sciences 2021年第1期126卷 147-173页

作者： Mohamed Salmi Younes Menni Ali j.chamkha HouariAmeur Rachid Maouedj Ahmed Youcef Department of Physics University of M’silaM’sila28000Algeria Laboratory of Physics and Chemistry of Materials University of M’silaM’sila28000Algeria Unit of Research on Materials and Renewable Energies Department of PhysicsAbou Bekr Belkaid UniversityTlemcen13000Algeria Faculty of Engineering Kuwait College of Science and TechnologyDoha DistrictKuwait Center of Excellence in Desalination Technology King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Technology University Center of NaamaNaama45000Algeria Unite de Recherche en Energies Renouvelables en Milieu Saharien URERMSCentre de Developpement des Energies RenouvelablesCDERAdrar01000Algeria

The hydrothermal behavior of air inside a solar channel heat exchanger equipped with various shaped ribs is analyzed *** bottom wall of the exchanger is kept adiabatic,while a constant value of the temperature is set at the upper *** duct is equipped with a flat rectangular fin on the upper wall and an upstream V-shaped baffle on the lower ***,five hot wall-attached rib shapes are considered:trapezoidal,square,triangular pointing upstream(type Ⅰ),triangular pointing downstream(type Ⅱ),and equilateral-triangular(type Ⅲ)cross *** of the flow rates are also inspected for various Reynolds numbers in the turbulent regime(1.2×10^(4)-3.2×10^(4)).The highest performance(η)value is given for the Ⅱ-triangular rib case in all Re values,while the square-shaped ribs show a significant decrease in the η along the achieved Re *** η value at Remax is 2.567 for the Ⅱ-triangular roughness *** with the other simulated cases,this performance is decreased by about 3.768%in the case of Ⅰ-triangular ribs,15.249% in the case of Ⅲ-triangular ribs,20.802% in the case of trapezoidal ribs,while 27.541% in the case of square ribs,at the same ***,a comparison ismade with air-heat exchangers that have non-rough walls and contain cross-shaped VGs presented previously,in order to highlight the effectiveness of the rough surface presence in the baffled and finned *** obtained results indicated that the triangular-shaped rib(type Ⅱ)has the most significant hydrothermal behavior than the other *** indicates the necessity of roughness heat transfer surfaces for finned and baffled channels to improve significantly the performance of the air-heat exchangers they contain.

关键词： CFD heat exchanger vortex generators ribs hydrothermal aspects

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Magnetohydrodynamic(MHD)boundary layer heat and mass transfer characteristics of nanofluid over a vertical cone under convective boundary condition

引用

Propulsion and Power Research 2018年第4期7卷 308-319页

作者： P.Sudarsana Reddy P.Sreedevi Ali j.chamkha Department of Mathematics RGM College of Eng.&TechNandyal 518501APIndia Mechanical Engineering Department Prince Mohammad Bin Fahd University.Al-Khobar 31952Kingdom of Saudi Arabia

This paper investigates the boundary layer flow,heat and mass transfercharacteristics over a vertical cone filled with nanofluid saturated porous medium with theinfluence of magnetic field,thermal radiation and first order chemical reaction subject to theconvective boundary *** transformation technique is used for the purpose ofconverting non-linear partial differential equations into the system of complex ordinarydifferential *** computational Finite element method has been employed to solvethe flow,heat and mass transfer equations together with boundary *** impact ofvarious pertinent parameters on hydrodynamic,thermal and solutal boundary layers isinvestigated and the results are displayed ***,the values of local skin-friction coefficient,rate of temperature and rate of concentration is also calculated and theresults are presented *** comparisons with previously published work is made andfound good *** thickness of thermal boundary layer is increased with increase inthe values of Brownian motion parameter(Nb)and thermophoresis parameter(Ni).

关键词： Heat andmasstransfer Vertical cone Nanofluid Convective boundary condition Finite elementmethod Chemical reaction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Investigations of Soret,joule and Hall effects on MHD rotating mixed convective flow past an infinite vertical porous plate

引用

journal of Ocean Engineering and Science 2019年第3期4卷 263-275页

作者： M.Veera Krishna B.V.Swarnalathamma Ali j.chamkha Department of Mathematics Rayalaseema UniversityKurnoolAndhra Pradesh 518007India Department of Science and Humanities Stanley College of Engineering&Technology for WomenAbidsHyderabadTelangana 500001India Department of Mechanical Engineering Prince Sultan Endowment for Energy and EnvironmentPrince Mohammad Bin Fahd UniversityAl-Khobar 31952Saudi Arabia RAK Research and Innovation Center American University of Ras Al Khaimah10021United Arab Emirates

We made an elaborate scrutiny on the Soret and joule effects of MHD mixed convective flow of an incompressible and electrically conducting viscous fluid past an infinite vertical porous plate taking Hall effects into *** technique is used to solve the non-dimensional *** effects of the various non-dimensional parameters on velocity,temperature and concentration within the boundary layer are *** that,computational deliberations or discussions are also undertaken on the effects of the pertinent or significant parameters on the skin-friction coefficient and rates of heat and mass transfer in terms of the Nusselt and Sherwood numbers *** concentration distribution increases with increase in Soret effect and decrease with increase in chemical reaction *** increase in Prandtl number results to decrease the temperature *** the primary and secondary velocity components and temperature increases with increasing heat source *** friction coefficient decreases with an increase in permeability parameter,whereas it shows reverse effect for thermal and mass Grashof *** number increases with an increase in Prandtl *** number reduces with increasing Soret number.

关键词： Hall effects Soret number Porous medium joules dissipation Chemical reaction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Darcy-Forchheimer relation in Casson type MHD nanofluid flow over non-linear stretching surface

引用

Propulsion and Power Research 2020年第2期9卷 159-168页

作者： Ghulam Rasool Ali j.chamkha Taseer Muhammad Anum Shafiq Ilyas Khan School of Mathematical Sciences Zhejiang UniversityHangzhouZhejiang310027China Mechanical Engineering Department Prince Mohammad Bin Fahd UniversityAl-Khobar31952Saudi Arabia Department of Mathematics College of ScienceKing Khalid University.Abha61413Saudi Arabia School of Mathematics and Statistics Nanjing University of Information Science and TechnologyNanjing210044China Faculty of Mathematics and Statistics Ton Due Tltang UniversityHo Chi Minh City72915Viet Nam

Present article aims to discuss the characteristics of Casson type nanofluid maintained to flow through porous medium over non-linear stretching surface in the perspective of heat and mass transfer developments.A Casson type incompressible viscous nanofluid passes through the given porous medium via Darcy-Forchheimer *** boundary conditions are used for velocity,temperature and concentration of the *** diffusion and thermophoresis is *** induced magnetic field effect is involved to accentuate the thermo-physical characteristics of the *** model incorporates boundary layer formulations and small magnetic Reynolds for practical validity.A fourth order Runge-Kutta(RK)scheme is enforced to solve the system *** are prepared for various progressive values of non-dimensionalized parameters whereas;variation in wall drag factor,heat and mass transfer rates is analyzed through numerical *** indicate that momentum boundary layer reduces for stronger inertial impact and the resistance offered by the porous media to the fluid *** is found as a progressive function for the Brownianmotion factor and *** magnitude of wall drag factor,heat transfer and masstransfer rates shows reduction for progressive values of slip parameters.

关键词： Casson type nanofluid Darcy-Forchheimer Magnetohydrodynamic(MHD) Nonlinear stretching Slip-boundary conditions

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Unsteady flow of a Maxwell nanofluid over a stretching surface in the presence of magnetohydrodynamie and thermal radiation effects

引用

Propulsion and Power Research 2017年第1期6卷 31-40页

作者： Macha Madhu Naikoti Kishan Ali j.chamkha Department of Mathematics Osmania UniversityHyderabad-7TSIndia Mechanical Engineering Department Prince Mohammad Bin Fahd UniversityAl-Khobar 31952Kingdom of Saudi Arabia

The problem of unsteady magnetohydrodynamic(MHD)boundary layer flow of a non-Newtonian Maxwell nanofluid over a stretching surface with thennal radiation is *** Maxwell model is used to characterize the non-Newtonian fluid *** appropriate similarity transformation Is employed to transform the governing partial differential equations of mass,momentum,energy and nanoparticle concentration into ordinary differential *** coupled non-linear ordinary differential equations are solved by using the variational finite element *** flow features and the heat transfer characteristics and nanoparticle volume fraction are analyzed and discussed in detail for several sets of values of the governing flow *** results for the skin-friction coefficient,local Nusselt number and the local Sherwood number are presented in tables for various values of the flow controlling parameters.

关键词： Unsteady flow Stretching surface Maxwell nanofluid Magnetohydrodynamic(MHD) Thermal radiation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Regression analysis and features of negative activation energy for MHD nanofluid flow model:A comparative study

引用

Propulsion and Power Research 2023年第2期12卷 273-283页

作者： B.Kumara Prachi Abhinav Singhal R.Nandkeolyar Pulkit Kumar Ali j.chamkha School of Mathematics Thapar Institute of Engineering and TechnologyPatiala 147004PunjabIndia Department of Applied Sciences and Humanities RITRoorkee 247667India School of Sciences Christ(Deemed to be University)Delhi NCR 201003India Department of Mathematics National Institute of TechnologyJamshedpur 831014India Department of Applied Mechanics Indian Institute of TechnologyDelhi 110016India Faculty of Engineering Kuwait College of Science and TechnologyDoha DistrictKuwait

This article elucidates the impact of activation energy on magnetohydrodynamic(MHD)stagnation point nanofluid flow over a slippery surface in a porous regime with thermophoretic and Brownian *** activation energy is scarce in practice,but the impact of negative activation energy could not be neglected as it is noticed in chemical *** rate of some Arrhenius-compliant reactions is retarded by increasing the temperature and is therefore associated with negative activation energies,such as exothermic binding of urea or *** some processes,the temperature dependence of the pressure-induced unfolding and the urea-induced unfolding of proteins at ambient pressure give negative activation *** present mathematical model is solved with successive linearization method(a spectral technique).A comparison of results is made for negative and positive values of activation *** from it,the quadratic multiple regression model is discussed briefly and explained with bar *** is observed that with rise in unsteadiness parameter from 0 to 1(taking positive activation energy),skin friction and Sherwood number are increased by 9.36%and 19%respectively,and Nusselt number is decreased by 26%.However,for negative activation energy,9.36%and 112%enhancement is observed in skin friction and Sherwood number,respectively.

关键词： Negative activation energy Regression analysis Successive linearization method Porous medium

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：