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Urban Physics： Effect of the micro-climate on comfort, health and energy demand

Frontiers of Architectural Research 2012年第3期1卷 197-228页

作者： Peter Moonen Thijs Defraeye Viktor Dorer Bert Blocken jan carmeliet ETH Swiss Federal Institute of Technology Zurich ZUrich Switzerland Empa Swiss Federal Laboratories for Materials Science and Technology KUL Katholieke Universiteit Leuven Leuven Belgium TU/e Eindhoven University of Technology Eindhoven The Netherlands

The global trend towards urbanisation explains the growing interest in the study of the modification of the urban climate due to the heat island effect and global warming, and its impact on enersy use of buildings. Also urban comfort, health and durability, referring respectively to pedestrian wind/ thermal comfort, pollutant dispersion and wind-driven rain are of interest. Urban Physics is a well- established discipline, incorporating relevant branches of physics, environmental chemistry, aerodynamics, meteorolosy and statistics. Therefore, Urban Physics is well positioned to provide keycontributions to the current urban problems and challenges. The present paper addresses the role of Urban Physics in the study of wind comfort, thermal comfort, energy demand, pollutant dispersion and wind-driven rain. Furthermore, the three major research methods applied in Urban Physics, namely field experiments, wind tunnel experiments and numerical simulations are discussed. Case studies illustrate the current challenges and the relevant contributions of Urban Physics.

关键词： Fietd experiments Wind tunnet experi-ments Nurnerical simutations Computationat fluiddynamics (CFD) Wind comfort Thermal comfort Energy demand Pollutant dispersion Wind-driven rain

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One droplet reaction for synthesis of multi-sized nanoparticles

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Nano Research 2023年第4期16卷 5850-5856页

作者： Bingda Chen Feifei Qin Meng Su Daixi Xie Zeying Zhang Qi Pan Huadong Wang Xu Yang Sisi Chen Jingwei Huang Dominique Derome jan carmeliet Yanlin Song Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijing Engineering Research Center of Nanomaterials for Green Printing TechnologyBeijing National Laboratory for Molecular Sciences(BNLMS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Chair of Building Physics Department of Mechanical and Process EngineeringETH Zürich(Swiss Federal Institute of Technology in Zürich)Zürich 8092Switzerland Department of Civil and Building Engineering Universitéde SherbrookeSherbrooke QC J1K 2R1Canada

Reaction kinetics of nanoparticles can be controlled by tuning the Peclet number(Pe)as it is an essential parameter in synthesis of multi-sized ***,we propose to implement a self-driven multi-dimension microchannels reactor(MMR)for the one droplet synthesis of multi-sized *** carefully controlling the Pe at the gas-liquid interface,the newly formed seed crystals selectively accumulate and grow to a specific *** the combination of microchannels of different widths and lengths,one droplet reaction in the same apparatus achieves the synchronous synthesis of diverse *** enables precise control of nanoparticle diameter at 5 nm precision in the range of 10-110 *** use of MMR can be extended to the synthesis of uniform Ag,Au,Pt,and Pd nanoparticles,opening towards the production and engineering of nanostructured *** approach gives the chance to regulate the accumulation probability for precise synthesis of nanoparticles with different diameters.

关键词： gas-liquid interface accumulation effect one droplet reaction multi-sized nanoparticles

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Transpiration-inspired Capillary for Synchronous Synthesis and Patterning of Silver Nanoparticles

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Chemical Research in Chinese Universities 2023年第1期39卷 133-138页

作者： CHEN Bingda ZHANG Zelong SU Meng QIN Feifej PAN Qi XIE Daixi YANG Xu ZHANG Kun ZHANG Zeying XIE Hongfei carmeliet jan SONG Yanlin Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijing Engineering Research Center of Nanomaterials for Green Printing TechnologyBeijing National Laboratory for Molecular Sciences(BNLMS)Beijing100190P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China Institute of Extreme Mechanics and School of Aeronautics Northwestern Polytechnical UniversityXi’an710072P.R.China Chair of Building Physics Department of Mechanical and Process EngineeringETH ZürichZürich8092Switzerland

Traditional synthesis strategy of nanomaterials with complicated process and high cost limits their ***,we propose a facile process for the synchronous synthesis and patterning of silver nanoparticles(Ag NPs)through the self-driven microchannel reactor with the capillary effect inspired by *** evaporation contributes to capillary and accumulation effects in the *** silver reactant-containing droplets can be spontaneously divided and distributed in multiple microchannels during the whole fabrication process by the capillary *** newly formed Ag NPs at the gas-liquid interface can be assembled on both sides of the microchannels by the accumulation *** capillary effect decreases the disturbances,which ensures the uniformity of the *** the combination of microchannels with different widths,various Ag NPs-assembled patterns with stable electrical properties are *** efficient strategy with a simple fabrication procedure is towards the technological engineering of nanoscale architected materials.

关键词： Transpiration Capillary effect Droplet manipulation Nanoparticle Patterning

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混合格子玻尔兹曼方法用于模拟纳米颗粒悬浮液的蒸发

混合格子玻尔兹曼方法用于模拟纳米颗粒悬浮液的蒸发

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第十二届全国流体力学学术会议

作者：秦飞飞赵建林费林林 Dominique Derome jan carmeliet 西北工业大学极端力学研究院 Department of Mechanical and Process Engineering ETH Zurich 中国石油大学(北京)石油化工学院 Université de Sherbrooke

纳米颗粒悬浮液的蒸发在科研和工程问题中具有广泛的应用,比如多功能材料的制备,喷墨打印,集成电路等。本文构建一种混合格子玻尔兹曼方法,用于模拟多孔介质内纳米颗粒悬浮液在不同条件下的蒸发问题。该模型包含三个部分:基于格子玻尔... 详细信息

纳米颗粒悬浮液的蒸发在科研和工程问题中具有广泛的应用,比如多功能材料的制备,喷墨打印,集成电路等。本文构建一种混合格子玻尔兹曼方法,用于模拟多孔介质内纳米颗粒悬浮液在不同条件下的蒸发问题。该模型包含三个部分:基于格子玻尔兹曼的恒温两相流模型(子模型1)、基于有限差分的温度模型(子模型2)以及基于格子玻尔兹曼的纳米颗粒运动模型(子模型3)。子模型1可精确模拟恒温下具有复杂气液界面变化的两相流动现象,如液滴飞溅和反弹(图1a-b);子模型1耦合子模型2可精确模拟模拟含潜热的相变问题,如液体受热蒸发(图1c-d);耦合三个子模型的整体模型可精确模拟考虑纳米颗粒传输、聚集和沉积的纳米颗粒悬浮液的蒸发(图1e)。本文将首先简单介绍该混合格子玻尔兹曼模型的构建,而后主要阐述纳米颗粒悬浮液的蒸发在三维芯片散热结构制备中的应用,并研究纳米颗粒浓度、蒸发温度、多孔结构接触角对散热结构制备(图1e)和散热效果(图1f)的影响。

关键词：悬浮液蒸发多孔介质纳米颗粒格子玻尔兹曼方法

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