李明伟
工程热力学;非平衡热力学;晶体生长过程中的热量、动量和质量输运;利用原子力显微镜开展晶体生长微观机制的热动力学研究。
个性化签名
- 姓名:李明伟
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学术头衔:
博士生导师, 中国优秀博士后奖, 优秀教师/优秀教育工作者
- 职称:-
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学科领域:
工程热物理
- 研究兴趣:工程热力学;非平衡热力学;晶体生长过程中的热量、动量和质量输运;利用原子力显微镜开展晶体生长微观机制的热动力学研究。
李明伟:男,汉族,工学博士。1964年11月出生,重庆人。现任重庆大学教授、博士生导师,热能工程系主任,重庆大学工程热物理研究所副所长。1982年9月至1986年7月在重庆大学攻读工程热物理专业学士学位;1986年9月至1989年4月在重庆大学攻读工程热物理专业硕士学位。1989年4月至1992年8月在自贡职业大学化工系任教。1992年8月至1995年11月在重庆大学攻读工程热物理专业博士学位。1995年获四川省优秀毕业博士生并获博士学位;博士毕业后留校任教。1996年获重庆大学跨世纪人才,破格晋升为副教授。1998年3月至2000年4月间,受日本学术振兴会资助,作为日本学术振兴会特别研究员(JSPS Research Fellow),在日本九州大学作博士后研究。2000年4月回国后破格晋升为教授。2001年被聘为博士生导师。现为重庆大学热力学方向学术带头人,重庆市首届学术技术带头人后备人选。主持国家自然科学基金、教育部优秀青年教师资助计划、教育部留学回国人员科研启动基金等项目共4项;主研国家重点基础研究发展规划项目(即“973”项目)、国家自然科学基金面上项目共4项。在J. Crystal Growth、Int. J. of Heat and Mass Transfer、工程热物理学报等国内外核心期刊上发表论文50余篇,其中20多篇被SCI、EI、ISPT收录,多次被他人引用。自然科学基金项目“界面现象的热力学理论, Marangoni 对流及其稳定性分析” 于2001年获“中国高校科学技术二等奖”。指导博士和硕士研究生20名。负责主讲的“工程热力学”课程于2002年被评为重庆市重点课程,2004 年被评为重庆市精品课程。主要研究方向:工程热力学;非平衡热力学;晶体生长过程中的热量、动量和质量输运;利用原子力显微镜开展晶体生长微观机制的热动力学研究。
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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
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【期刊论文】Numerical investigation of FZ-growth of GaAs with encapsulant
李明伟, Mingwei Li a, *, Wenrui Hu b, Shuxian Chen a
International Journal of Heat and Mass Transfer 47(2004)2941-2947,-0001,():
-1年11月30日
Numerical simulation of flow and heat transfer for a 3 in. (0.075m) diameter liquid encapsulant full float zone (LEFZ) growth of single-crystal GaAs was conducted using the finite-element method. Convective and conductive heat transfers, radiative heat transfer between diffuse surfaces and the Navier–Stokes equations for both melt and encapsulant as well as the interface position are all combined and solved simultaneously. The effect of the thickness of encapsulant, rotation rate of crystal and feed rod on the flow and heat transfer as well as on the growing and melting interface shape were investigated.
Liquid encapsulant full float zone, GaAs, Boron oxide, Finite-element method
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【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
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【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
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李明伟, LIU Chun-mei, LI Ming-wei, CHEN Huai-jie
材料科学与工程学报,2005,23(4):546~549,-0001,():
-1年11月30日
采用有限元法对LEC法生长的3英寸GaAs单晶中的热应力进行求解。假设晶体为轴对称的各向同性线弹性体。主要讨论了不同液封厚度、轴向磁场强度以及晶体转速下的流动和传热所对应的晶体中的热应力分布,同时也考察了界面形状对应力的影响。
LEC法, 热应力, GaAs单晶
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【期刊论文】Global simulation of a silicon Czochralski furnace
李明伟, Mingwei Li a, YourongLi a, Nobuyuki Imaishi a, *, Takao Tsukada b
Journal of Crystal Growth 234(2002)32-46,-0001,():
-1年11月30日
To understand the characteristics of the Czochralski (Cz) furnace for the single-crystal growth of silicon, a set of global analyses of momentum, heat and mass transfer in small Cz furnaces (crucible diameter: 7.2cm, crystal diameter: 3.5cm, operated in a 10 Torr argon flow environment) is carried out using the finite-element method. The global analysis assumes a pseudosteady axisymmetric state with laminar flow, equilibrium relations at the melt/silica interface and vapor-liquid chemical equilibrium at the melt/gas interface, as well as the segregation coefficient of unity at the melt/crystal interface. Convective and conductive heat transfers, radiative heat transfer between diffuse surfaces and the Navier-Stokes equations for gas and melt phases are all combined and solved together. Thus, the velocities and temperatures obtained are used to calculate the oxygen concentrations. The global analysis code is effectively used to discuss the influences of the Marangoni effect and a gas guide (or a heat shield) placed between the crucible and the crystal. The results indicate that the gas guide reduces the heater power and changes the melt flow pattern and oxygen transport. The melt flow pattern is strongly dependent on the Marangoni effect and gas flow near the surface, and changes the oxygen concentration significantly. This analysis reveals the importance and effectiveness of global analysis.
A1., Computer simulation, A1., Fluid flows, A1., Heat transfer, A1., Mass transfer, A2., Czochralski method, B2., Semiconducting silicon
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李明伟, Mingwei Li*, Danling Zeng, Tingxia Zhu
International Journal of Heat and Mass Transfer 45(2002)157-164,-0001,():
-1年11月30日
Linear stability theory is used to analyze the stability of the basic state solution of Marangoni convection in a liquid bridge with liquid encapsulation. By processing the linear disturbance equations numerically, stability analysis can be evolved to a complex general eigenvalue problem. Inverse iteration algorithm combined with LZ algorithm is employed to solve the complex generalized eigenvalue problem. The results show that the stability of the system can be enhanced greatly by choosing reasonable matching parameters of the two fluid layers. The preferred mode of instability is axial wave number α=2, 3 and 4, which means that the system is more sensitive to the disturbance with larger wave lengths.
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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.
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【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
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【期刊论文】Numerical analysis of LEC growth of GaAs with an axial magnetic field
李明伟, Mingwei Li a, *, Wenrui Hu b, Nuohu Chen c, Danling Zeng a, Zemei Tang b
International Journal of Heat and Mass Transfer 45(2002)2843-2851,-0001,():
-1年11月30日
A set of numerical analyses for momentum and heat transfer for a 3 in. (0.075m) diameter Liquid Encapsulant Czochralski (LEC) growth of single-crystal GaAs with or without an axial magnetic field was carried out using the finite-element method. The analyses assume a pseudosteady axisymmetric state with laminar flows. Convective and conductive heat transfers, radiative heat transfer between diffuse surfaces and the Navier-Stokes equations for both melt and encapsulant and electric current stream function equations for melt and crystal are considered together and solved simultaneously. The effect of the thickness of encapsulant, the imposed magnetic field strength as well as the rotation rate of crystal and crucible on the flow and heat transfer were investigated.
Liquid Encapsulant Czochralski (, LEC), , Growth of GaAs, Magnetic field, Finite-element method, Boron oxide
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