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Atmospheric Pressure Plasma Jet in Ar and O_2/Ar Mixtures:Properties and High Performance for surface cleaning

Plasma Science and Technology 2013年第12期15卷 1203-1208页

作者：金英任春生杨亮张家良王德真 School of Mathematic and Physics Bohai University School of Physics and Optoelectronic Technology Dalian University of Technology

An atmospheric pressure plasma jet generated in Ar and O2/Ar mixtures has been investigated by specially designed equipment with double power electrodes at 20~32 kHz, and their effects on the cleaning of surfaces have been studied. Properties of the jet discharge are studied by electrical diagnostics, including the waveform of discharge voltage, discharge current and the Q-V Lissajous figures. The optical emission spectroscopy is used to measure the plasma parameters, such as the excitation temperature and the gas temperature. It is found that the consumed power and the excitation temperature increase with increase of the discharge frequency. On the other hand, at the same discharge frequency, these parameters in O2/Ar mixture plasma are found to be much larger. The effect on surface cleaning is studied from the changes in the contact angle. For Ar plasma jet, the contact angle decreases with increase of the discharge frequency. For O2/Ar mixture plasma jet, the contact angle decreases with increase of discharge frequency up to 26 kHz, however, further increase of discharge frequency does not show further decrease in the contact angle. At the same discharge frequency, the contact angle after O2/Ar mixture plasma cleaning is found to be much lower compared to the case of pure Ar. From the results of quadrupole mass-spectrum analysis, we can identify more fragment molecules of CO and H2O in the emitted gases after O2/Ar plasma jet treatment compared with Ar plasma jet treatment, which are produced by the decomposition of surface organic contaminants during the cleaning process.

关键词： atmospheric pressure plasma jet surface cleaning the excitation temperature,the contact angle quadrupole mass-spectrum

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Environment-friendly surface cleaning using micro-nano bubbles

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Particuology 2022年第7期20卷 1-9页

作者： Nuo Jin Fenghua Zhang Yan Cui Le Sun Haoxiang Gao Ziang Pu Weimin Yang College of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijing 100029China

cleaning a surface using a solution containing a large number of micro to nano scale bubbles has significant advantage regarding environmental *** review first briefly introduces the cleaning mechanism of micro-nano bubbles(MNBs),including physical and chemical *** the applications of MNBs in cleaning of metal parts,precision parts,cultural relics or food are *** that,coupled cleaning method of ultrasound and bubbles is ***,the characterization methods for the cleaning effect are introduced,which mainly focuses on the changes of physico-chemical properties(mass or cleaning area,infiltration,colony number and light scattering intensity)of the cleaned parts or that(like conductivity)of the *** is believed that MNBs technology will be applied in a broader range of surface cleaning applications.

关键词： Micro-nano bubbles surface cleaning Green cleaning Environmental protection

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Investigation on the influence of vortex generator on particle resuspension

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Particuology 2024年第3期86卷 126-136页

作者： Dongchi Yu Jun-Li Lin Jin-Han Xie ASML 80W Tasman DrSan Jose95134CaliforniaUSA Department of Mechanics and Engineering Science at College of Engineering and State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing100081China

The vortex generator(VG)and its well-known effect in flow optimization are widely studied and employed across different engineering ***,while the same working principles of VG may be well suited for the applications on surface-cleaning technologies,such promising potential is hardly,if any,explored in the published ***,in the present study,the influence on flow-induced particle resuspension brought by a rectangular vG in a channel flow is investigated with the help of highfidelity computational fluid dynamics *** increases of particle removal forces and resuspension rates are discovered in long,strip-like regions with reduced boundary-layer thickness resulted from the vG-induced vortices,and the enhancement effect is especially significant for configurations with the VG installed at a greater angle of *** is also shown that while the resuspension enhancements on the lower and the upper surfaces of the channel exhibit distinct statistical characteristics,having a VG in the channel improves the overall particle-removing capability of the channel flow by introducing higher surface-averaged removal forces and particle resuspension *** but not least,the increase of resuspension rate is especially significant for the smaller,micron-scale particles which are otherwise hardly disturbed by a VG-less channel flow,and such resuspension-enhancement effectgenerally subsides with increasing particle size.

关键词： Particle resuspension Vortexgenerator CFD surface cleaning

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Effects of Multiple cleaning and Disinfection Interventions on Infectious Diseases in Children: A Group Randomized Trial in China

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Biomedical and Environmental Sciences 2015年第11期28卷 779-787页

作者： BAN Hai Qun LI Tao SHEN Jin LI Jin PENG Pin Zhang YE Heng Ping ZHANG Liu Bo Institute of Environment Health and Related Product Safety Center for Disease Control and Prevention of China Center for Disease Control and Prevention of Xiantao city

Objective To assess the effectiveness of multiple cleaning and disinfection interventions in the homes and kindergartens, in reducing gastrointestinal and respiratory illnesses of children. Methods From October 2010 to September 2011, we performed a prospective, controlled study in China. 408 children under 5 years old were recruited and group randomized into intervention and control groups. Families and kindergartens in the intervention group were provided with antibacterial products for hand hygiene and surface cleaning or disinfection for one year. Each child＇s illness symptoms and sick leave were recorded every day. Results A total of 393 children completed the study, with similar baseline demographics in each of the 2 groups. Except for abdominal pain, the odds of symptoms （fever, cough and expectoration, runny nose and nasal congestion, diarrhea）, illness （acute respiratory illness and gastrointestinal illness）, and sick leave per person each month were significantly reduced by interventions. The rates of fever, diarrhea, acute respiratory illness, gastrointestinal illness and sick leave per person per year were significantly decreased as well. Conclusion Not only the acute respiratory children were significantly reduced by multiple and gastrointestinal illness but the sick leave rate in interventions.

关键词： Communicable disease control Child daycare centers Sick leave Antibacterial agents Hand hygiene Domestic hygiene surface cleaning surface disinfection

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