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Key Technologies for Preparing Nanoparticles of Hydrogen Storage Material by Combining Ball Milling with aerosol generation

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International Journal of Plant Engineering and Management 2015年第1期20卷 28-36页

作者： ZHAO Xu-zhe Leon L.Shaw Department of Mechanical Materials and Aerospace EngineeringIllinois Institute of Technology

The developing trend of vehicle is electrical vehicle in future, and fuel cell will become the one of the main batteries of electrical vehicle because of its the prominent properties. The one of current obstacle for fuel cell in popularization and applications is lacking of excellent performance hydrogen storage materials and advanced technologies of preparing nanoparticles for hydrogen storage materials. The principles, typical classifications and characteristics of chemically and physically preparing nanoparticles for hydrogen storage materials are briefly introduced. And it predicts that physical method is going to be the major developing direction for nanoparticles for hydrogen storage material fabrication. The principle, the system composition ＆ characteristics of method by means of combining ball milling with aerosol generation preparing nanoparticles for hydrogen storage materials are expounded. The ball milling process for hydrogen storage material is needed to conduct effective cooling process, and the lower cooling temperature has better milling results. The cooling media for ball milling include room temperature water, ice water, pure ethanol with dry ice and liquid nitrogen. The proper level of vacuum in canister is significant for injecting aerosol particles during the ball milling. In order to maximize the friction force, it is better to design multi-level stirring rod and the profile of stirring rod with large contact area, therefor stirring rod with cylinder has less grinding effect than with ring profile. The more stirring rod with more layers will obtain higher stirring efficiency. The distance between each layer of branches is 2.5 times larger than diameter of the ball. The simulation results show that the average speed has 120% increases from 400 rpm to 800 rpm. Based on the kinetic energy equation, it is obtained that there is 350% increase in energy from 400 r/min to 800 r/min. The higher stirring speed will generate the finer material. And the

关键词： nanoparticles hydrogen storage material aerosol generation ball milling flow fields hydrodynamics

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Experimental assessment of a new salt aerosol generator for measuring efficiency of automotive air filters

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Journal of Central South University 2012年第3期19卷 682-687页

作者：周斌张小松 P.Tronville 惠慕贤惠旅锋 School of Energy and Environment Southeast University Key Laboratory of Environmental Medicine Engineering of Ministry of Education Southeast University Politecnico di Torino Corso Duca degli Abruzzi 24Torino 10129Italy Suxin Cleanroom Equipment Factory

generation of polydisperse KCl aerosol with a new salt aerosol generator was investigated, Special attention was paid on particles with diameters between 3 and 10 μm. The main improvement consists of the different routes of KCl solution droplets. In traditional generators, the solution droplets travel through one cylinder; while in the case analyzed here, after spray atomization, the droplets travel through two cylinders in series. The first cylinder was fed with warm air and the second one with cold air. In such way, the complete evaporation of the water from the droplets can be ensured. The influencing factors of the generated aerosol size distribution were investigated. The data measured show that the concentration of generated aerosol becomes higher both increasing the flow rate of the KCI solution injected in the first cylinder and increasing the concentration in the solution. The temperature of solution influences mainly the generation of smaller KCI particles （0,3-3 μm）. The amount of hot air used in the generation process increases the concentration of larger KC1 particles （〉3 μm） while cold air does not have the same effect. The aerosol generator is able to generate KC1 aerosol stably. This instrument can be used effectively for testing air filters for automotive.

关键词： aerosol generation potassium chloride aerosol droplet-to-particle conversion air filter testing

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Design and Characterization of an aerosol Test Chamber for Emergency Response Patient Contamination Control Simulation and Research

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Occupational Diseases and Environmental Medicine 2023年第1期11卷 78-96页

作者： Megan L. Steele Emily M. Spatz George P. Lemmer Jacob M. Denney Jeremy M. Slagley Casey W. Cooper Robert M. Eninger Fenic Ltd. Dayton USA Department of Systems Engineering and Management Air Force Institute of Technology Wright-Patterson Air Force Base Montgomery County USA Air Force Materiel Command Office of the Command Surgeon Wright-Patterson Air Force Base Montgomery County USA

Contaminated or infected patients present a risk of cross-contamination for emergency responders, attending medical personnel and medical facilities as they enter a treatment facility. The controlled conditions of an aerosol test chamber are required to examine factors of contamination, decontamination, and cross-contamination. This study presents the design, construction, and a method for characterizing an aerosol test chamber for a full-sized manikin on a standard North Atlantic Treaty Organization litter. The methodology combined air velocity measurements, aerosol particle counts and size distributions, and computational fluid dynamics modeling to describe the chamber’s performance in three dimensions. This detailed characterization facilitates future experimental design by predicting chamber performance for a variety of patient-focused research.

关键词： Test Chamber Characterization aerosol generation Exposure Chamber Design Air Velocity Mapping Spatial Variability CFD Modeling Patient Decontamination

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