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Investigation of the Film Formation in Dynamic Air Spray Painting

Fluid Dynamics & Materials Processing 2024年第10期20卷 2393-2415页

作者： Deqing Han Yong Zeng Jintong Gu Bin Yan School of Mechanical Engineering Yancheng Institute of TechnologyYancheng224051China

To accurately predict the film thickness distribution during dynamic spraying performed with air guns and support accordingly the development of intelligent spray painting,the spray problem was analyzed *** particular,the Eulerian-Eulerian approach was employed to calculate the paint atomization and film deposition *** spray heights,spray angles,spray gun movement speeds,spray trajectory curvature radii,and air pressure values were *** simulation results indicate that the angle of spray painting significantly affects the velocity of droplets near the spray *** an increase in the spraying angle,spraying height and spray gun movement speed,the maximum film thickness decreases to varying degrees,and the uniformity of the film thickness also continuously *** the spray gun moves along an arc trajectory,at smaller arc radii,the film thickness on the inside of the arc is slightly greater than that on the outside,but the impact on the maximum film thickness is *** air pressure expands the coating coverage area,results in finer atomization of paint droplets,and leads to a thinner and a more uniform paint ***,if the pressure is too high,it can cause paint *** the orthogonal experimental method,multiple sets of simulation calculations were conducted,and the combined effects of spraying height,spray angle,and spray gun movement speed on the film thickness distribution were comprehensively analyzed to determine optimal ***,the reliability of the numerical simulations was validated through dynamic spray painting experiments.

关键词： Air spray painting CFD simulation paint film-forming regularity orthogonal array testing

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Optimal Conditions for the Purification of Sesamin by Recrystallization

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Agricultural Science & Technology 2017年第7期18卷 1202-1204,1364页

作者：刘末周仁杰吴静雷红南京财经大学食品科学与工程学院江苏南京210023 合肥工业大学食品科学与工程学院安徽合肥230009

[Objective] Sesamin has been widely used in healthy food and medicines in recent years due to its prominent biological functions. This study was aimed to determine the optimal parameters for sesamin recrystallization, to obtain high-quality and high-purity sesamin. [Method] The effects of solid-liquid ratio, heating tempera- ture and cooling temperature on sesamin recrystallization were investigated by sin- gle-factor experiments and orthogonal array testing （ORT）. The purity of resulting sesamJn was investigated by HPLC, [Result] The optimal conditions for the purifica- tion of sesamin were solid-liquid ratio of 1：10, heating temperature of 45 ℃ and cooling temperature of 25 ℃. Under these conditions, the purity of sesamin reached 95.26%. [Conclusion] Recrystallization is an effective technique to purify sesamin from sesame meal. Moreover, HPLC is also an ideal method for analyzing the purity of sesamin.

关键词： Sesamin Recrystallization orthogonal array testing HPLC

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