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Effect of droplet size on the jet breakup characteristics of n-butanol during impact on a heated surface

Journal of Traffic and Transportation Engineering(English Edition) 2020年第3期7卷 320-330页

作者： Han Wu Longmin Tang Chunze Cen Chia-Fon Lee School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Department of Mechanical Aerospace and Ciuil EngineeringUniversity of ManchesterManchester M139PLUK Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbana1L 61801USA

jet breakup during droplet impacted on heated surface has received wide concerns due to its *** Weber number(We)is a common used dimensionless parameter to classify and analyze the phenomenon,but it is unable to summarize all detailed phenomenon variations and related ***,the effect of droplet size on jet breakup was investigated by considering its significant difference in various *** behavior of n-butanol droplets with diameter range from 1.71 mm to 2.84 mm impacts a heated surface with jet breakup was recorded by backlit *** parameters,the jet breakup time,the jet breakup length and the jet ligament diameter,were analyzed to illustrate the *** results showed that these parameters are affected by the droplet size largely at 10breakup time,breakup length and jet ligament diameter increase with the initial *** time of jet breakup versus agrees well with the theory of Rayleigh instability regardless of droplet *** addition,the jet breakup phenomenon was observed to evolve into pancake bouncing with an ultrafine high-speed jet when the We was above 50.

关键词： Energy engineering Droplet impact Heated surface Droplet size jet breakup n-butanol

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Dominant Factors of Metal jet breakup in Micro Droplet Deposition Manufacturing Technique

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Chinese Journal of Aeronautics 2010年第4期23卷 495-500页

作者：齐乐华蒋小珊罗俊候向辉李贺军西北工业大学机电学院西安710072 英国诺丁汉大学机械材料制造工程系西北工业大学材料学院西安710072

For the solutions of random variations of metal jet breakup and difficulties in controlling and predicting the process parameters （e.g. jet length） in micro droplet deposition manufacturing technique, experimental methods combining with theoretical analyses have been developed. The jet formation, jet length and their dominant factors （oxygen concentration and disturbance frequency, etc.） are discussed. The statistical law of jet length is found that the probability density function （PDF） of jet length is a log-normal distribution. The results show that the formation and size accuracy of metal jet breakup are improved by adjusting the gas pressure and optimizing the disturbance frequency. Under this circumstance, the jet length and morphological deviation can be minimized, which provides a stable droplet stream for the subsequent manufacturing process.

关键词： jet breakup oxidation jet length optimal frequency log-normal distribution

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Range formula based on angle of dispersion and nozzle configuration from an impact sprinkler

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International Journal of Agricultural and Biological Engineering 2019年第5期12卷 97-105页

作者： Yue Jiang Zakaria Issaka Hong Li Pan Tang Chao Chen Research Centre of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013China Department of Agricultural Engineering Tamale Technical UniversityNorthern RegionTamaleGhana

jet breakup and dispersion from impact sprinkler are mainly influenced by the configurations of nozzle and dispersion *** on the structure,different types of nozzles were designed and tested with a pointed tip dispersion device under low pressure *** were performed using High-Speed Photographic technique,and Matlab computation program was established and applied to determine the initial jet breakup length and angle of dispersion from the *** sprinkler range decreased with the increase in diameter of nozzle,and the largest range of 15.1 m was produced from sprinkler with 6 mm nozzle size under a pressure of 150 *** angle of dispersion decreased with the increase of jet velocity,the spray coverage from sprinkler with 6 mm nozzle size was 1478 mm under 150 kPa,and was not statistically different when the pressure was increased.A new range formula was established for sprinkler with dispersion device through curve fitting of the parameters of initial jet breakup length,angle of dispersion,nozzle size and working *** new formula was reliable for calculating range with a relative error less than 3%.Since the formula is based on the angle of dispersion,it could be useful to estimate uniformity of water distribution in sprinkler irrigated fields.

关键词： fixed dispersion device range jet breakup angle of dispersion spray coverage impact sprinkler

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