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Investigation of the trajectory uniformity in water dissolution ultraprecision continuous polishing of large-sized KDP crystal

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International Journal of Extreme Manufacturing 2020年第4期2卷 48-56页

作者： Zhipeng Cheng Hang Gao Ziyuan Liu Dongming Guo Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024 People’s Republic of China

Large-sized potassium dihydrogen phosphate(KDP)crystals are an irreplaceable nonlinear optical component in an inertial confinement fusion *** by the size,previous studies have been aimed mainly at the removal principle and surface roughness of small-sized KDP crystals,with less research on *** to its low surface damage and high machining efficiency,water dissolution ultraprecision continuous polishing(WDUCP)has become a good technique for processing large-sized KDP *** this technique,the trajectory uniformity of water droplets can directly affect the surface quality,such as flatness and ***,uneven trajectory distribution of water droplets on the surface of KDP crystals derived from the mode of motion obviously affects the surface *** this study,the material removal mechanism of WDUCP was introduced.A simulation of the trajectory of water droplets on KDP crystals under different eccentricity modes of motion was then ***,the coefficient of variation(CV)was utilized to evaluate the trajectory ***,to verify the reliability of the simulation,some experimental tests were also conducted by employing a large continuous *** results showed that the CV varied from 0.67 to 2.02 under the certain eccentricity mode of motion and varied from 0.48 to 0.65 under the uncertain eccentricity mode of *** CV of uncertain eccentricity is always smaller than that of certain ***,the uniformity of trajectory was better under uncertain *** the mode of motion of uncertain eccentricity,the initial surface texture of the100 mm×100 mm×10 mm KDP crystal did achieve uniform *** surface root mean square roughness was reduced to 2.182 nm,and the flatness was reduced to 22.013μ***,the feasibility and validity of WDUCP for large-sized KDP crystal were verified.

关键词： potassium dihydrogen phosphate crystal water dissolution ultraprecision continuous polishing trajectory uniformity flatness

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Response surface method for modeling the removal of carbon dioxide from a simulated gas using water absorption enhanced with a liquid-film-forming device

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Journal of Environmental Sciences 2018年第3期30卷 116-126页

作者： Diem-Mai Kim Nguyen Tsuyoshi Imai Thanh-Loc Thi Dang Ariyo Kanno Takaya Higuchi Koichi Yamamoto Masahiko Sekine Graduate School of Environmental Sciences and Engineering Yamaguchi University Graduate School of Sciences and Technology for Innovation Yamaguchi University Department of Environmental Science College of Sciences Hue University

This paper presents the results from using a physical absorption process to absorb gaseous CO2mixed with N2using water by producing tiny bubbles via a liquid-film-forming device（LFFD）that improves the solubility of CO2in *** influence of various parameters—pressure,initial CO2concentration,gas-to-liquid ratios,and temperature—on the CO2removal efficiency and its absorption rate in water were investigated and estimated thoroughly by statistical polynomial models obtained by the utilization of the response surface method（RSM）with a central composite design（CCD）.Based on the analysis,a high efficiency of CO2capture can be reached in conditions such as low pressure,high CO2concentration at the inlet,low gas/liquid ratio,and low *** instance,the highest removal efficiency in the RSM–CCD experimental matrix of nearly 80%occurred for run number 20,which was conducted at 0.30 MPa,CO2concentration of 35%,gas/liquid ratio of 0.71,and temperature of 15℃.Furthermore,the coefficients of determination,R^2,were 0.996 for the removal rate and 0.982 for the absorption rate,implying that the predicted values computed by the constructed models correlate strongly and fit well with the experimental *** results obtained provide essential information for implementing this method properly and effectively and contribute a promising approach to the problem of CO2capture in air pollution treatment.

关键词： Carbon dioxide water dissolution Liquid-film Response surface method (RSM)

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