由长福
煤燃烧及污染防治、多相流动理论、新能源(天然气水合物、太阳能)、煤矿瓦斯治理与利用。
个性化签名
- 姓名:由长福
- 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:煤燃烧及污染防治、多相流动理论、新能源(天然气水合物、太阳能)、煤矿瓦斯治理与利用。
由长福,博士,研究员/博士生导师。2007年入选教育部新世纪人才支持计划。
简历:1987年—1992年 清华大学热能系,本科;1992年—1996年 清华大学热能系,博士,导师:叶大均教授,岳光溪教授;1996年—2001年 清华大学热能系教师;2001年-2006年 清华大学热能系 副教授;2006年-现在 清华大学热能系 研究员;1999年 日本福井大学进修PIV测量技术;1999年 法国杜埃矿业研究院 博士后;2002年 美国华盛顿州立大学 访问学者。研究方向:煤燃烧及污染防治、多相流动理论、新能源(天然气水合物、太阳能)、煤矿瓦斯治理与利用。
近五年发表论文80余篇(其中SCI论文20余篇),发表的SCI论文除两篇发表在《力学学报》英文版外,其余均发表在国际上本领域的著名期刊上。在基础研究的同时,注重其应用背景,提出多项发明专利与1项软件著作权。
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由长福, 祁海鹰, 徐旭常, 山本富士夫
应用力学学报,2004,21(4):1~5,-0001,():
-1年11月30日
采用PTV技术对循环流化床顶部颗粒稀疏流动区域进行了测量,其中采用先进的高速摄像技术获取流动的连续图像,并采用目前有望在气固两相流动测量中发挥较大作用的四种PⅣ算法:BICC法、VGT法、SPRING法和4-FRAME法,对所获取的图像进行颗粒配对处理,从而得到流场中运动颗粒的速度信息。所得到的结论为:本文所采用的PTV算法在图像处理中都产生少量的伪矢量,通过采取简单的伪矢量识别算法就可以剔除大部分伪矢量;本文实验条件下,测得循环流化床顶部区域内颗粒运动速度差别较小。本文工作为进一步详细实验测量研究奠定了理论与技术基础。
PTV, 气固两相流动, 实验测量, 循环流化床
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由长福, Hailiang Zhao, Changfu You*, Haiying Qi, Xuchang Xu
Atmospheric Environment 39 (2005) 3015-3021,-0001,():
-1年11月30日
An integrated measurement system was developed using high-speed photography, image recognition and PIV/PTV techniques to simultaneously measure the velocities and size distributions of fine atmospheric aerosols. The photographic system included a high-power (25W) continuous laser, a microscope and a high-speed CCD camera (30-10,000 fps) could capture successive particle images on a microsecond time scale and micron space scale. The software system integrates improved image recognition algorithms for circular particles, various image-processing algorithms and advanced PIV/PTV algorithms. The information is extracted from the images in three steps: image preprocessing, particle recognition from images to obtain the diameters and positions of the particles, and the velocity vector calculation using PIV/PTV techniques. The system was tested using a computer-generated image. The results show that the particle extraction algorithms are robust and accurate. The system was also used to effectively measure fine atmospheric particles in the smoke from burning incense. Some problems are identified for future improvements. © 2005 Elsevier Ltd. All rights reserved.
Velocity and size measurement, Aerosols, PIV/, PTV, Circle detection, Image processing
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由长福, 席兵, 祁海鹰, 程旭, 徐旭常
工程热物理学报,2005,26,(5):805~807,-0001,():
-1年11月30日
本文在对风沙流进行气固两相流分析的堆础上实观了低风速条件下的沙粒起动过程,借助PIV测冒系统对其进行了观测并对影响因素进行了分析,获得了沙粒的浓度和速度分布。实验结果表明沙粒浓嫂沿离沙面的高度呈负指数分布特征。流体起动和冲击起动下的输沙率随摩阻速度和甫诺数的增加而调增加,而起动效能比随之减小并趋向于常数0.207测量得到的输沙率修正低速范罔内的Bagnold公式和河忖龙码公式。
粒起动, 输沙率, 起动救能比, PIV
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由长福, 仇轶, 祁海鹰, 徐旭常
化工学报,2006,57(6):1323~1328,-0001,():
-1年11月30日
采用无网格伽辽金法对多相流动中的颗粒运动进行了直接数值模拟,颗粒的受力通过积分颗粒表面压力和黏性力获得,颗粒运动用牛顿运动定律表示。在模拟两个颗粒一前一后的下落过程中,两颗粒呈现出文献中所观察到的拖曳、亲和、翻滚的现象,在处理颗粒碰撞上,无网格法显示了其优越性,实现了颗粒真正碰撞,解决了困扰多相流直接数值模拟发展的一个重要问题。最后,还模拟了6个颗粒在管道内的下落过程。这些计算都表明,由于无网格法不需要单元的连接,适合于推广到大型的气固两相流的直接数值模拟计算中,从而为多相流直接数值模拟的广泛开展奠定坚实的基础。
无网格法, 伽辽金法, 气固两相流, 直接数值模拟, 颗粒碰撞
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【期刊论文】无网格方法中的背景积分方案及单颗粒下降过程的数值模拟
由长福, 仇轶, 祁海鹰, 徐旭常
计算物理,2006,23(5):525~529,-0001,():
-1年11月30日
在用无网格方法对有边界移动的气固两相流动进行数值模拟时发现,如果采用背景积分网格对求解域进行积分,将会产生压力场的数值振荡,使计算结果失真。详细分析了产生这种数值振荡的原因,提出了解决方案,并计算了一个颗粒在管道内的下降过程。计算结果表明,提出的解决方案能有效地降低压力场的数值振荡,从而使无网格方法能应用于气固两相流动的直接数值模拟。
无网格伽辽金法, 无网格法, 分步法, 背景积分, 任意拉格朗日-欧拉法
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51浏览
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由长福, 赵海亮, 黄斌, 祁海鹰, 徐旭常
工程热物理学报,2006,27(6):1063~1065,-0001,():
-1年11月30日
采用微观可视化的高速摄像技术直接观察了燃烧源亚微米颗粒物间的相互作用形态,发现了亚微米颗粒间存在 “吸引-旋绕-排斥”形态的相互作用。通过颗粒受力分析,认为传统所考虑的曳力、重力、库仑力、范德华力不能解释这种相互作用。根据亚微米颗粒荷电的不均匀性特征提出颗粒静电力应包括净电荷库仑力和感应偶极子间作用力两部分。感应偶极子间作用力是近程力,具有径向和周向两个方向,在颗粒比较接近的时候迅速增大,并能导致颗粒之间相互旋绕和排斥。该力与上述几种力综合起来可以很好地解释实验发现的这种颗粒相互作用形态。
亚微米颗粒, 颗粒间相互作用, 颗粒受力, 静电力, 偶极子力
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由长福, Haiying Qi∗, Fei Li, Bing Xi, Changfu You
Chemical Engineering Science 62 (2007) 1670-1681,-0001,():
-1年11月30日
Combined with the Eulerian approach, energy minimization multi-scale (EMMS) theory was used to develop a new theoretical model for the drag between the gas and solid phases in dense fluidized systems. The energy minimization was used in the solution procedure as an additional stability condition to close the conservation equations. The model was derived without introducing any empirical factors, so it can be used for more flow conditions in circulating fluidized beds (CFBs) than empirical models, especially for heterogeneous gas-solid two-phase flows that include cluster formation. Non-uniform particle distribution in computational cells, which is usually not described by the differential equations, is also considered in the new drag model. Both the drag values given by the model and simulation results for real systems agree well with experimental data. The results show that the model reasonably describes the interactions between the gas and particle phases in dense flows.
Modeling, Drag, Cluster effect, Fluidization, Stability, Simulation
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由长福, Bin Huang*, Qiang Yao, Shui-Qing Li, Hai-Liang Zhao, Qiang Song, Chang-Fu You
Powder Technology 163 (2006) 125-133,-0001,():
-1年11月30日
Four kinds of solid particles were captured by a single fiber. The particles included two kinds of fly ash particles and two kinds of ceramic particles under three different types of charging pretreatment. The single fiber was fixed across a square cross-section glass tube. A standard continuous aerosol generator was used to disperse particles to generate a uniform aerosol. The aerosol particles from the generator were tribocharged, polarized or charged, and then passed across the fiber. A microscope and a CCD camera were used to observe the capturing process and the shape distribution of dendrites. The results showed that the deposited particles developed in different ways. In the tribocharged case, dendrite formation can be classified into three distinct stages. In the prepolarized case, straight chains were formed at a uniform spacing interval, and had high binding intensity to support very long chains. Even though the long chains fell over they still had high capturing efficiency. In the precharged case, some straight chains with some branches were formed, but their binding intensity was low and they easily fell over and broke. The results also showed how the particle diameter and shape influenced the formation of dendrites and chains.
Microscope, Fine particles, Single fiber, Filtration
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【期刊论文】Direct Numerical Simulation of Microparticle Motion in Channel Flow with Thermophoresis
由长福, You Changfu and Li Guanghui
Journal of Environmental Engineering, Vol.134, No.2, February 1, 2008.,-0001,():
-1年11月30日
The motion of microparticles in a vertical flow channel driven by drag and thermophoretic forces was simulated using the direct numerical simulation method with the particles tracked using the Lagrangian method. The particle motions were analyzed for five sizes of particles (dp=1, 2.5, 10, 20, and 100μm) at three temperature differences(△t=0, 130, and 180℃). The results showed that the effect of thermophoresis on the deposition near the wall decreases with increasing particle diameter and can be neglected for particles with dp=100μm. Since the deposition rates of inhalable particles (PM10) increase dramatically as the thermophoresis force increases, especially for particles with dp=1μm, thermophoresis is an effective method for collecting inhalable particles.
Simulation, Turbulent flow, Particles, Vertical forces
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【期刊论文】Interactions between fine combustion droplets
由长福, Changfu You*, Hailiang Zhao, Bin Huang, Haiying Qi, Xuchang Xu
Powder Technology 185 (2008) 267-273,-0001,():
-1年11月30日
Interactions between fine combustion droplets were directly observed using microscopic flow visualization and high speed photography. The observations revealed "attracting-revolving-repulsing" interactions between the droplets. Force analyses showed that the traditionally considered interparticle forces, including drag, gravitation, the Coulomb force and the van der Waals force, cannot explain these interactions. However, the induced dipoles on the droplets due to the non-uniform distribution of surface charges on the fine droplets have important influence on such interactions. Therefore, the inter-dipole forces must be taken into account in the interaction force analysis as well as the Coulomb force between the net charges. The inter-dipole force includes components in the radial and azimuthal directions and is inversely proportional to r4. This force causes the particles to revolve and repel each ther at small distance. The combined effects of the inter-dipole force and the traditionally considered forces give a complete explanation for the particle interactions.
Fine combustion droplets, Particle interaction, Coagulation, Interparticle force, Inter-dipole force
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