期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
考虑热传导和焦耳耗散对太阳爆发事件的进一步研究
1
作者 金曙平 郝蕾 沈俊太 《天体物理学报》 CSCD 2000年第1期85-100,共16页
考虑焦耳耗散和热传导效应后对太阳爆发事件作进一步研究.数值结果表明,焦耳加热效应使等离子体团温度升高,热传导则将热量从高温区向低温区传输,同时考虑焦耳加热与热传导效应,模拟结果与作者1996年的结论(磁岛的运动方向与浮现... 考虑焦耳耗散和热传导效应后对太阳爆发事件作进一步研究.数值结果表明,焦耳加热效应使等离子体团温度升高,热传导则将热量从高温区向低温区传输,同时考虑焦耳加热与热传导效应,模拟结果与作者1996年的结论(磁岛的运动方向与浮现场的温度、密度有关.磁岛向上运动撤离计算域或向下运动淹没于光球层,分别有向上或向下的高速流与之相对应)基本类似.这不仅揭示了磁通量对消与高速流产生的动力学原因、对红移、蓝移分量的非对称性作出合理解释,而且能更好地体现爆发事件中高速流的观测特征. 展开更多
关键词 热传导 焦耳耗散 太阳射电爆发
下载PDF
磁流体湍流及数值模拟研究综述 被引量:3
2
作者 范月华 蒋崇文 +1 位作者 高振勋 李椿萱 《力学与实践》 北大核心 2016年第1期14-21,共8页
自从20世纪90年代初,AJAX计划的提出掀起了磁流体技术的研究热潮.本文总结了国内外关于磁流体湍流研究的成果,包括两方面:磁流体湍流的特点和数值模型.相比于普通湍流,磁流体湍流表现出电磁诱导的各向异性、线性焦耳耗散、湍流重层流化... 自从20世纪90年代初,AJAX计划的提出掀起了磁流体技术的研究热潮.本文总结了国内外关于磁流体湍流研究的成果,包括两方面:磁流体湍流的特点和数值模型.相比于普通湍流,磁流体湍流表现出电磁诱导的各向异性、线性焦耳耗散、湍流重层流化等特性,本文同时对磁流体湍流的结构和脉动抑制现象进行了描述:数值模型研究从雷诺平均方程和大涡模拟两方面作了介绍.当前研究集中在不可压缩磁流体湍流,距离能够应用于航空航天问题还有很长的路要走. 展开更多
关键词 磁流体湍流 各向异性 焦耳耗散 重层流化 数值模型
下载PDF
Radiative squeezing flow of unsteady magneto-hydrodynamic Casson fluid between two parallel plates 被引量:2
3
作者 N. B. NADUVINAMANI Usha SHANKAR 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第5期1184-1204,共21页
Present numerical study examines the heat and mass transfer characteristics of magneto-hydrodynamic Casson fluid flow between two parallel plates under the influence of thermal radiation,internal heat generation or ab... Present numerical study examines the heat and mass transfer characteristics of magneto-hydrodynamic Casson fluid flow between two parallel plates under the influence of thermal radiation,internal heat generation or absorption and Joule dissipation effects with homogeneous first order chemical reaction.The non-Newtonian behaviour of Casson fluid is distinguished from those of Newtonian fluids by considering the well-established rheological Casson fluid flow model.The governing partial differential equations for the unsteady two-dimensional squeezing flow with heat and mass transfer of a Casson fluid are highly nonlinear and coupled in nature.The nonlinear ordinary differential equations governing the squeezing flow are obtained by imposing the similarity transformations on the conservation laws.The resulting equations have been solved by using two numerical techniques,namely Runge-Kutta fourth order integration scheme with shooting technique and bvp4c Matlab solver.The comparison between both the techniques is provided.Further,for the different set physical parameters,the numerical results are obtained and presented in the form of graphs and tables.However,in view of industrial use,the power required to generate the movement of the parallel plates is considerably reduced for the negative values of squeezing number.From the present investigation it is noticed that,due to the presence of stronger Lorentz forces,the temperature and velocity fields eventually suppressed for the enhancing values of Hartmann number.Also,higher values of squeezing number diminish the squeezing force on the fluid flow which in turn reduces the thermal field.Further,the destructive nature of the chemical reaction magnifies the concentration field;whereas constructive chemical reaction decreases the concentration field.The present numerical solutions are compared with previously published results and show the good agreement. 展开更多
关键词 squeezing flow thermal radiation heat generation or absorption Casson fluid Joule dissipation magnetic field
下载PDF
Three-dimensional unsteady squeezing flow with irreversibility 被引量:2
4
作者 HAYAT T AHMAD M Waqar +1 位作者 SHEHZAD S A ALSAEDI A 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第11期3368-3380,共13页
This exploration examines unsteady magnetohydrodynamic(MHD) three-dimensional flow of viscous material between rotating plates subject to radiation,Joule heating and chemical reaction.The non-linear partial differenti... This exploration examines unsteady magnetohydrodynamic(MHD) three-dimensional flow of viscous material between rotating plates subject to radiation,Joule heating and chemical reaction.The non-linear partial differential system is re-structured into the ordinary differential expressions by the implication of appropriate transformations.The developed differential equations are computed by homotopy analysis technique.Numerical consequences have been accomplished by various values of emerging parameters.Coefficients of skin friction and heat and mass transfer rates have been scrutinized.Irreversibility analysis is carried out.Influence of various prominent variables on entropy generation is presented.Moreover,the temperature increases for higher Dufour number and concentration distribution reduces against Soret number.Higher squeezing parameter enhances velocity while concentration reduces with an increment in squeezing parameter.Both entropy rate and Bejan number increase against higher diffusion parameter. 展开更多
关键词 Joule heating viscous dissipation magnetohydrodynamic(MHD)flow chemical reaction entropy generation
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部