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Experimental study on fusion and break-up motion after droplet collision

Chinese Journal of Chemical Engineering 2020年第3期28卷 712-720页

作者： Yi Li Zhi Ning Ming Lü Beijing Jiaotong University School of MechanicalElectronic and Control EngineeringBeijing 100044China Beijing Jiaotong University Beijing Key Lab Powertrain New Energy VehicleBeijing 100044China

The interactions between droplets have an important influence on the atomization of liquid fuel,the combustion efficiency,and the reduction of particulate matter emissions for an *** this reason,this paper presents results from an experimental study on the coalescence and break-up of droplets after *** to the shape and parameters of the droplets at different times after the collision of the droplets was captured by a high speed camera,analysis was done for the following effects of droplet collisions:the collision-coalescence motion for the collision between the droplets,the change history of the dimensionless length-to-width ratio of the oscillation motion,the critical size ratio of the breakup motion,and the liquid physical properties of the *** results show that the droplets collide and exhibit two forms of coalescence oscillation and break-up:for oscillating motion,at higher droplet collision velocities and dimensionless size ratios,there will be a larger dimensionless length-to-width ratio for the droplet oscillation;for the break-up motion,at higher collision velocities,there will be lower dimensionless size ratios,and lower liquid surface tension,shorter times over which the droplet breaks,and facilitated droplet *** research results presented here can be used for atomization in engine cylinder,increasing the gas/liquid contact area and enhancing the combustion efficiency of gas/liquid heat transfer to improve the combustion efficiency of the engine.

关键词： Collision between droplets size ratio Collision velocity Broken moment

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Effects of high pressure roller grinding on size distribution of vanadium-titanium magnetite concentrate particles and improvement of green pellet strength

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Journal of Iron and Steel Research International 2017年第3期24卷 266-272页

作者： Feng Chen Yu-feng Guo Tao Jiang Fu-qiang Zheng Shuai Wang Ling-zhi Yang School of Minerals Processing and Bioengineering Central South University Changsha 410083 Hunan China

The vanadium-titanium magnetite concentrate from Panxi region of China was pretreated by high pressure roller grinding（ HPRG） and then used in pelletization. size distribution change of the vanadiumtitanium magnetite concentrate after HPRG and the improvement of its green pellet strength were investigated. The results indicated that,besides the increase of fine particles,the vanadium-titanium magnetite concentrate after HPRG had a smaller size ratio of fine particle to coarse particle of 0. 126,meaning a lower porosity,compared with the size ratio of raw material of 0. 157. The concentrate particles were more closely packed when there was a smaller size ratio of fine particle to coarse particle. The particle packing in the green pellets was closer after HPRG,which strengthened the green pellets with an average drop number of 5. 1（ drop height of 0. 5 m） and average compressive strength of 13. 1 N per pellet of 11 mm in diameter.

关键词： High pressure roller grinding Particle packing size distribution size ratio Green pellet strength

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