李强
热能工程。1、功能流体流动与能量传递机理及其控制方法。2、系统热控制理论与技术。3、强化传热及节能技术。
个性化签名
- 姓名:李强
- 目前身份:
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
- 职称:-
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学科领域:
热工学
- 研究兴趣:热能工程。1、功能流体流动与能量传递机理及其控制方法。2、系统热控制理论与技术。3、强化传热及节能技术。
李强,男,出生年月:1971-10-14,教授,博士生导师。
学科研究方向:热能工程。
1、功能流体流动与能量传递机理及其控制方法:围绕纳米流体、磁流体等功能流体在热科学领域中的应用基础研究中急需解决的若干关键科学问题:功能流体强化传热的多尺度分析方法;纳米流体强化传质机制;磁流体流动和传热特性及其控制方法;温度敏感型磁性流体自主能量传输技术等。
2、系统热控制理论与技术:围绕航天器、卫星、电子设备等系统与设备热控制与热管理研究领域,开展以下研究内容:高热流器件散热理论与技术;智能化自主散热理论与技术;微小型热控元件与MEMS散热理论与技术;深低温热收集与传输排热理论与技术;高适应能力的主动热控理论与技术等。
3、强化传热及节能技术:强化传热的新原理、新方法;新型节能技术等。
学术任职:中国宇航学会深空探测专业委员会委员;江苏省工程热物理学会理事。
荣誉:教育部新世纪优秀人才;江苏省333工程高层次人才培养工程优秀中青年学术带头人;江苏省普通高等学校青蓝工程优秀青年骨干教师;中国兵工学会青年科技奖;南京理工大学董事会优秀后备学科带头人奖;南京理工大学董事会奖教金一等奖。
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【期刊论文】Simulation and control scheme of microstructure in magnetic fluids
李强, LI Qiang†, XUAN YiMin & LI Bin
Sci China Ser E-Tech Sci, June 2007, vol. 50, no.3, 371-379,-0001,():
-1年11月30日
By accounting for the external and internal force acting on the suspended magnetic nanoparticles and motion characteristics of the suspended magnetic nanoparticles in the magnetic fluids, the three-dimensional microstructure of magnetic fluids is investigated by means of the molecular dynamics simulation method. The distribution of suspended magnetic nanoparticles and microstructure of the magnetic fluid are simulated in both absence and presence of an external magnetic field. The effects of the nanoparticles volume fraction, the dipole-dipole interaction potential and the particle-field interaction potential on the microstructures of the magnetic fluids are discussed. The main results obtained here are summarized as follows. The suspended magnetic nanoparticles tend to aggregate and make the irregular distribution structure in the absence of an external magnetic field. When the magnetic fluid is exposed to a magnetic field, the magnetic nanoparticles suspended in the carrier fluid tend to remain chained-alignment in the direction of the external magnetic field. The tendency of chain-alignment morphology of the suspended magnetic nanoparticles is enhanced with the nanoparticles volume fraction, the dipole-dipole interaction potential and the particle-field interaction potential.
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【期刊论文】Experimental investigations on transport properties of magnetic fluids
李强, Qiang Li, Yimin Xuan*, Jian Wang
Experimental Thermal and Fluid Science 30(2005)109-116,-0001,():
-1年11月30日
Experimental investigations are carried out to measure the viscosity and the thermal conductivity of the aqueous magnetic fluids in either the absence or the presence of the external magnetic field. The effects of the volume fraction of the suspended magnetic particles, concentration of surfactants and the external magnetic field strength as well as its orientation on the transport properties of the magnetic fluid are analyzed. The experimental results show that the viscosity of the sample magnetic fluids increases with the percentages of the suspended magnetic particles and the surfactants. The viscosity first increases with the magnetic field and finally approaches a constant as the magnetization of the magnetic fluid arrives at a saturation state. For the same magnetic fluid, the viscosity in the magnetic field being perpendicular to the flow direction is bigger than that in the parallel field under the same magnetic field. The thermal conductivity of the sample magnetic fluids is larger than that of pure fluids in both the absence and presence of the external magnetic field. Almost no change in the thermal conductivity of the sample magnetic fluid is found in the magnetic field perpendicular to the temperature gradient. The thermal conductivity of the magnetic fluid increases with the strength of the applied magnetic field being parallel to the temperature gradient.
Magnetic fluid, Viscosity, Thermal conductivity, Magnetic effect
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【期刊论文】A novel method to determine effective thermal conductivity of porous materials
李强, QIAN Jiyu, LI Qiang, YU Kai & XUAN Yimin
Science in China Ser. E Engineering & Materials Science 2004 Vol. 47 No.6 716-724,-0001,():
-1年11月30日
A 2D Lattice-Boltzmann (LB) model is proposed for analyzing the heat conduction process in the porous media. The effective thermal conductivities of several porous materials are calculated by means of this model. The calculated results are found to be in excellent agreement with the experimental data of the existing references. The factors affecting the effective thermal conductivity of porous materials are discussed. The results show that the effective thermal conductivity is strongly dependent upon the porosity and the pore structure and only has imperceptible dependence on the pore density. Then the correlation for estimating the effective thermal conductivity of the porous material is established. This LB model can be used conveniently to calculate and analyze the heat conduction problems of porous media or other materials with complex geometry boundary in pore scale.
Lattice-Boltzmann,, porous media,, effective thermal conductivity.,
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【期刊论文】Convective heat transfer and flow characteristics of Cu-water nanofluid
李强, LI Qiang & XUAN Yimin
SCIENCE IN CHINA (Series E) August 2002 Vol. 45 No.4,-0001,():
-1年11月30日
An experimental system is built to investigate convective heat transfer and flow characteristics of the nanofluid in a tube. Both the convective heat transfer coefficient and friction factor of Cu-water nanofluid for the laminar and turbulent flow are measured. The effects of such factors as the volume fraction of suspended nanoparticles and the Reynolds number on the heat transfer and flow characteristics are discussed in detail. The experimental results show that the suspended nanoparticles remarkably increase the convective heat transfer coefficient of the base fluid and show that the friction factor of the sample nanofluid with the low volume fraction of nanoparticles is almost not changed. Compared with the base fluid, for example, the convective heat transfer coefficient is increased about 60% for the nanofluid with 2.0 vol% Cu nanoparticles at the same Reynolds number. Considering the factors affecting the convective heat transfer coefficient of the nanofluid, a new convective heat transfer correlation for nanofluid under single-phase flows in tubes is established. Comparison between the experimental data and the calculated results indicate that the correlation describes correctly the energy transport of the nanofluid.
nanofluid,, convective heat transfer,, correlation,, friction factor.,
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