已为您找到该学者10条结果 成果回收站
【期刊论文】微重力下两同轴液柱内的热毛细对流的渐近解及数值模拟
李明伟, LI Mingwei, ZENG Danling
工程热物理学报,1997,18(2):177~180,-0001,():
-1年11月30日
A mathematical model describing the thermocapillary convection in two immiscible coaxial liquid columns is proposed. An approximate analytical solution is obtained by asymptotical way. The results of numerical simulation show that effective reduction of ther-mocapillary convection in the inner liquid layer can be reached by properly selecting the encapsulation which has a reasonable match relation with the encapsulated fluid.
热毛细对流, 液封, 渐近线方法
-
25浏览
-
0点赞
-
0收藏
-
0分享
-
33下载
-
0
-
引用
李明伟, LI Mingwei, KANG Ning, ZENG Danling
工程热物理学报,1997,18(6):725~728,-0001,():
-1年11月30日
A mathematical model describing the axisymmetric thermocapillary convection in three immiscible coaxial liquid columns held between two planar faces with individual constant temperature is proposed in the present paper. An approximate analytical solution is obtained by asymptotical way. The expected control of the thermocapillary convection can be realized by choosing reasonable matching parameters.
热毛细对流, 液封, 渐近线方法
-
52浏览
-
0点赞
-
0收藏
-
0分享
-
87下载
-
0
-
引用
李明伟, MINGWEI LI and DANLING ZENG†
Int. J. Heat Mass Transfer Vol. 39, No.17, pp. 3725-3732, 1996,-0001,():
-1年11月30日
The present paper is devoted to the investigation of the effect of liquid encapsulation on the Marangoni convection in its inner columnar liquid layer under a microgravity condition. The asymptotic solution of the mathematic model established in the paper was obtained for the immiscible axisymmetric coaxial liquid columns contained between planar faces. Numerical simulation based on the asymptotic solution was carried out. The main influence factors on the process were discussed in detail. It is found that proper selection of the related parameters will result in a remarkable reduction of the Marangoni convective flow. Copyright.
-
30浏览
-
0点赞
-
0收藏
-
0分享
-
33下载
-
0
-
引用
【期刊论文】Suppression of Marangoni convection of silicon melt by a non-contaminating method
李明伟, Jie Li a, Mingwei Li a, *, Wenrui Hu b, Danling Zeng a
International Journal of Heat and Mass Transfer 46(2003)4969-4973,-0001,():
-1年11月30日
A set of numerical simulation of the effect of the gas shearing flow over a silicon melt free surface on Marangoni convection under microgravity condition was conducted by using finite element method. For given gas channel width, Marangoni number and aspect ratio a remarkable reduction of Marangoni convection in silicon liquid bridge can be achieved by choosing the optimal gas velocity in accordance with the correlation proposed in the paper. The effectiveness of the reduction of the gas flow under different conditions shows that, in some cases, Marangoni convection reduction of 99% can be realized by this non-contaminating method.
Marangoni convection, Silicon, Non-contamination method, Finite-element method
-
25浏览
-
0点赞
-
0收藏
-
0分享
-
134下载
-
0
-
引用
【期刊论文】Oxygen-transport phenomena in a small silicon Czochralski furnace
李明伟, You-Rong Li a, Ming-Wei Li a, Nobuyuki Imaishi b, *, Yasunobu Akiyama b, Takao Tsukada c
Journal of Crystal Growth 267(2004)466-474,-0001,():
-1年11月30日
In order to understand the basic characteristics of the gas-phase mass-transfer coefficient (kg) in a small silicon Czochralski (Cz) furnace, a very crude model was proposed and the results were correlated by the Sherwood number as a function of Reynolds number. It was confirmed that by installing a gas guide in the hot zone, the mass transfer coefficient was significantly enhanced. A set of global analyses of small Cz furnaces was conducted with different values of diffusivity of SiO in the gas phase (DSiO) and of oxygen in the melt phase (DO) in order to elucidate which rate process controls the average oxygen concentration ([O]ave) in the grown crystal. These simulations revealed that in these small Cz furnaces, [O]ave is dependent on the gas phase mass transfer rate and melt flow patterns. A decrease in DSiO causes an increase in [O]ave. An increase in DO tends to increase [O]ave slightly in most cases.
A1., Computer simulation, A1., Fluid flow, A1., Heat transfer, A1., Mass transfer, A2., Czochralski method, B2., Diffusivity, B2., Finite-element method, B2., Oxygen transport, B2., Semiconducting silicon
-
36浏览
-
0点赞
-
0收藏
-
0分享
-
213下载
-
0
-
引用