| 幂律流体在圆管内湍流流动剪切率的近似计算 |
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| 引用本文： | 张劲军,严大凡.幂律流体在圆管内湍流流动剪切率的近似计算[J].水动力学研究与进展(A辑),2003,18(2):248-252. |
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| 作者姓名： | 张劲军 严大凡 |
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| 作者单位： | 石油大学(北京)油气储运工程系,北京,102200 |
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| 基金项目： | 中国石油天然气集团公司“九五”攻关项目，教育部博士点基金资助项目 ( 19980 42 5 17) |
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| 摘 要： | 根据剪切率和能量耗散率的定义，建立了幂律流体湍流剪切率与能量耗散率的关系式。参照文献上对不可压缩牛顿流体湍流能量耗散率的近似算法，提出了一种幂律流体管内湍流能量耗散率的近似算法，从而得到了幂律流体管内湍流剪切率的实用近似算式，再利用湍流剪切率与脉动流剪切率的关系即可得到脉动流剪切率。计算得到的湍流剪切率分布及其随流动特性指数变化的特征与已知规律相符。
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| 关 键 词： | 幂律流体 圆管 湍流流动 剪切率 近似计算 |
| 文章编号： | 1000-4874(2003)02-0248-05 |
An estimation approach to the shear rate of the power law fluid in turbulent pipe flow |
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| ZHANG Jin-jun,YAN Da-fan.An estimation approach to the shear rate of the power law fluid in turbulent pipe flow[J].Journal of Hydrodynamics,2003,18(2):248-252. |
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| Authors: | ZHANG Jin-jun YAN Da-fan |
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| Abstract: | According to the definition, a relationship between the shear rate and the energy dissipation rate is obtained for turbulent flow of power law fluid. By imitating the approach to approximately estimating the turbulent energy dissipation rate for incompressible Newtonian fluid, an approximate calculation method is developed for the turbulent energy dissipation rate for the pipe flow of the power law fluid, thus a practical equation is obtained for estimation of the turbulent shear rate of the power law fluid. Therefore, shear rate due to velocity fluctuations can be determined by using its relationship with the turbulent shear rate. Characteristics of estimated turbulent shear rate and its variation with the power law index agree with known results. |
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| Keywords: | shear rate turbulent flow velocity fluctuations power law fluid pipe flow |
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