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磁场作用下三维方腔内液态金属自然对流的数值模拟 被引量:7
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作者 王增辉 陈欢 杨嵩 《中国科学院大学学报(中英文)》 CAS CSCD 北大核心 2013年第4期472-477,共6页
为研究液态金属在磁场和壁面不同导电特性下的自然对流换热规律,对磁场作用下三维封闭方腔内的液态金属自然对流进行了数值模拟.研究表明:当没有外加磁场时,模拟结果与已有实验结果相符;当存在外加磁场时,三维方腔内的流动和换热出现较... 为研究液态金属在磁场和壁面不同导电特性下的自然对流换热规律,对磁场作用下三维封闭方腔内的液态金属自然对流进行了数值模拟.研究表明:当没有外加磁场时,模拟结果与已有实验结果相符;当存在外加磁场时,三维方腔内的流动和换热出现较大变化.由于液态金属在磁场中运动产生感应电流,感应电流与外加磁场相互作用产生一个与运动方向相反的洛伦兹力,抑制了流动和液态金属的自然对流换热.通过绝缘边界和导电边界的研究结果对比表明,壁面导电性能对于磁流体流动和换热产生很大影响. 展开更多
关键词 磁场 三维封闭方腔 自然对流 导电边界
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Analysis of circular-to-circular groove waveguide junction 被引量:1
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作者 崔立成 杨鸿生 《Journal of Southeast University(English Edition)》 EI CAS 2003年第1期17-21,共5页
Mode matching method is used to analyze the scattering characteristics of thecircular-to-circular groove waveguide junction. Matching the electric fields and magnetic fields atthe boundary of the junction, and multipl... Mode matching method is used to analyze the scattering characteristics of thecircular-to-circular groove waveguide junction. Matching the electric fields and magnetic fields atthe boundary of the junction, and multiplying the mode functions of the circular waveguide andcircular groove waveguide on both sides of the boundary equation, the scattering matrix equation isobtained, the scattering coefficients can be obtained from the equation. Then the scatteringcharacteristics of the iris with circular window in circular groove waveguide are analyzed. At lastthe convergent problem is discussed; when choosing a suitable mode group, convergent numericalresults are obtained, and the frequency response of the iris' scattering coefficients is also given. 展开更多
关键词 circular groove waveguide circular-to-circular groove waveguide junction mode matching method
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Measurement of thermal boundary conductance between metal and dielectric materials using femtosecond laser transient thermoreflectance technique 被引量:6
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作者 ZHANG ChungWei BI KeDong +2 位作者 WANG JianLi NI ZhongHua CHEN YunFei 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第4期1044-1049,共6页
The thermal boundary conductance of Al/SiO2, Al/Si, Au/SiO2, and Au/Si are measured by a femtosecond laser transient thermoreflectance technique. The distinct differences of the interfacial thermal conductance between... The thermal boundary conductance of Al/SiO2, Al/Si, Au/SiO2, and Au/Si are measured by a femtosecond laser transient thermoreflectance technique. The distinct differences of the interfacial thermal conductance between these samples are observed. For the same metal film, the thermal boundary conductance between metal and substrate decreases with the thermal conductivity of the substrate. The measured results are explained with the phonon diffusion mismatch model by introducing a phonon transmission coefficient across the interface. 展开更多
关键词 femtosecond transient thermoreflectance technique thermal boundary conductance thermal model phonon transimis- sion probability
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Two-Point Resistance of a Cobweb Network with a 2r Boundary 被引量:12
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作者 谭志中 方靖淮 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第1期36-44,共9页
We consider the problem of the two-point resistance on an m ×n cobweb network with a 2r boundary, which has never been solved before. Up to now researchers just only solved the cases with free boundary or null re... We consider the problem of the two-point resistance on an m ×n cobweb network with a 2r boundary, which has never been solved before. Up to now researchers just only solved the cases with free boundary or null resistor boundary. This paper gives the general formulae of the resistance between any two nodes in both tinite and infinite cases using a method of direct summation pioneered by Tan [Z. Z. Tan, et al., J. Phys. A 46 (2013) 195202], which is simpler and can be easier to use in practice. This method contrasts the Green's function technique and the Laplacian matrix approach, which is difllcult to apply to the geometry of a cobweb with a 2r boundary. We deduce several interesting results according to our genera/formula. In the end we compare and illuminate our formulae with two examples. Our analysis gives the result directly as a single summation, and the result is mainly composed of the characteristic roots. 展开更多
关键词 equivalent resistance cobweb model matrix transformation boundary conditions
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Thermal Analysis of Resin Composites with Ellipsoidal Filler Considering Thermal Boundary Resistance 被引量:2
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作者 Yusuke Asakuma Tsuyoshi Yamamoto 《Journal of Thermal Science》 SCIE EI CAS CSCD 2016年第5期424-430,共7页
The effective thermal conductivity of composites with ellipsoidal fillers is analyzed by using a homogenization method that is able to represent the microstructure precisely.In this study,various parameters such as th... The effective thermal conductivity of composites with ellipsoidal fillers is analyzed by using a homogenization method that is able to represent the microstructure precisely.In this study,various parameters such as the volume fraction,shape,and distribution of the filler are quantitatively estimated to understand the mechanisms of heat transfer in the composite.First,thermal boundary resistance between resin and filler is important for obtaining composites with higher thermal conductivity.Second,the anisotropy of the effective thermal conductivity arises from contact between filler in the case of ellipsoidal filler and produces lower thermal resistance.Finally,the filler network and thermal resistance are essential for the heat transfer in composites because the path of thermal conduction is improved by contact between neighboring filler particles. 展开更多
关键词 effective thermal conductivity homogenization method multiscale analysis composite.
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