Experimental investigation of primary breakup in close-coupled gas atomization

被引:0
|
作者
Cheng, T. [1 ,2 ]
Leibovici, R. [1 ]
Kong, B. [2 ]
van Hout, R. [1 ]
机构
[1] Technion Israel Inst Technol, Dept Mech Engn, IL-3200003 Haifa, Israel
[2] Guangdong Technion Israel Inst Technol, Dept Chem Engn, Shantou 515063, Peoples R China
关键词
Close-coupled gas atomization; Primary breakup; Digital holography; Droplet distributions; LIQUID JET; NUMBER; DISTRIBUTIONS;
D O I
10.1016/j.ijmultiphaseflow.2024.105009
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Primary breakup of a liquid water jet in close-coupled gas atomization (CCGA) was studied using digital inline holography. Different nozzles with constant liquid protrusion length and characterized by three different apex angles,= = 14o, o , 24o o and 34o o were used. Measurements were conducted at two Weber numbers, We = 57.5 and 82.5. At each We, , five different momentum flux ratios, , were studied. A detailed analysis of the instantaneous liquid jet interfaces indicated that the "filming" occurred at a lower critical with increasing . Furthermore, with increasing , peak probabilities of interface lengths shifted to larger values while increasing led to increased maximum lengths. Fractal dimensions increased with downstream distance. Distributions of area-based droplet diameters spanned a broad size range up to 3 mm and were well described by least-squares fitted power laws, including an exponential cut-off. The highest number of droplets was generated at = = 24o o for = = 1.67 and 2.40 for We = 57.5 and 82.5, respectively. The percentage of circular droplets (based on a circularity-based threshold) was highest at = 14o o and decreased with increasing .
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页数:16
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