高分子湍流减阻流的黏度分布研究 (吴桂芬; 李昌烽; 黄东升; 王瑞; 赵作广; 冯晓东)

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7TI3h7e+KX0高分子湍流减阻流的黏度分布研究水利论文h3\u$^]$B

p.T[6pT3C8[L1u0【作者】吴桂芬; 李昌烽; 黄东升; 王瑞; 赵作广; 冯晓东 【作者单位】江苏大学能源与动力工程学院; 上海华普汽车研究院

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【论文摘要】 自从 Toms 发现高分子湍流减阻效应之后,众多学者也纷纷开展了对其减阻机理的研究,但是一直都没有定论。牛顿湍流添加高分子之后,流体的拉伸黏度增大,流体变成非牛顿流体-黏弹性流体,整个流体的黏度呈现一种新的分布情况。本研究在分析高分子减阻机理的基础上,以 Maxwell 黏弹性模型为依托,推导出湍流在添加高分子之后,与牛顿流相比,它的黏粘度增大,呈现出一种以距壁面距离 y 为函数的线性分布,并且得到了相应的减阻参数。然后运用数值模拟对此线性黏度分布进行验证,发现此线性黏度分布的确能引起湍流流动阻力的降低,并能得到中等程度的减阻效果,说明这种黏度分布对于解释高分子减阻机理具有一定的合理性。水利论文(S RHG3` NP2O

&H)~(o&S#|0【英文论文摘要】 Since Toms found the turbulence drag reduction induced by the polymer,a lot of investigations have been done on the subject,but the mechanism for the drag reduction by the polymers still remains under debate.After adding the polymer,the fluid extensional viscosity is increased and the flow will become non-Newtonian,then the viscosity profile of the fluid will change greatly and induce the drag reduction of the turbulence.In our paper,on the basis of analyzing the mechanism for drag reduction and according to the Maxwell visco-elastic model,we have derived the viscosity profile growing linearly with the distance from the wall after adding the polymer and the drag reduction parameter has been assured.And then the numerical simulations have been performed with this linear viscosity profile,really showing drag reduction.This indicates that the linear viscosity profile is somewhat reasonable in interpreting the drag reduction mechanism induced by the polymers.水利论文2q Z w G,x

)cc9|/c+\'{)s0【论文关键词】 高分子; 湍流减阻; 线性黏度分布; 雷诺应力水利论文xv@ d$`1c
【英文论文关键词】 polymer; turbulence drag reduction; viscosity profile; Reynolds stress水利论文:hwy$w0K/ZPB-~(|
【基金】国家自然科学基金(10672069)水利论文-xc}!c5vU q*rv"k%^(l1I

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TAG: 湍流 王瑞 黏度 高分子 冯晓东
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