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Numerical Study on Cavitation Generation in a Water Jet Added with Turbulent Drag-Reducing Additives Based on Improved Cavitation Model and Cross Model
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2018-07-18 , DOI: 10.1021/acs.iecr.8b02179
Guo-Dong Li 1 , Song-Sheng Deng 1 , Jin-Fa Guan 1 , Yan Chen 1
Affiliation  

An improved cavitation model was proposed to simulate the cavitation phenomenon in a water jet added with turbulent drag-reducing additives. The Cross model which expressed the shear-thinning properties of drag-reducer solution was also employed. The neglected viscous term and surface tension term in traditional cavitation models were reconsidered as viscosity, and surface tension force were important factors affecting bubbles’ motion in drag-reducer solution. The numerical solutions of bubble radius in drag-reducer solutions of different concentrations were fitted, and the change rates were added to the original mass transfer mechanism equations. The results showed that the modified cavitation model described the cavitation characteristics in drag-reducer solutions more accurately and effectively reflected that the cavitation region’s wake became longer with the increase concentration of the drag reducing agent. When the concentration increased, the distribution of cavitation cloud became more homogeneous, and the pressure curve and velocity curve both changed more smoothly.

中文翻译:

基于改进的空化模型和交叉模型的水射流中添加减湍流减阻剂的数值研究

提出了一种改进的空化模型,以模拟添加了湍流减阻添加剂的水射流中的空化现象。还使用了表示减阻剂溶液的剪切稀化特性的Cross模型。将传统空化模型中被忽略的粘性项和表面张力项重新考虑为粘度,并且表面张力是影响减阻剂溶液中气泡运动的重要因素。拟合了不同浓度的减阻剂溶液中气泡半径的数值解,并将变化率添加到原始的传质机理方程中。结果表明,改进的空化模型更准确地描述了减阻剂溶液中的空化特性,并有效地反映了随着减阻剂浓度的增加,空化区域的尾流变得更长。当浓度增加时,空化云的分布变得更均匀,压力曲线和速度曲线都更加平稳地变化。
更新日期:2018-07-19
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