| 球形气泡在匀速粘性液体中引起的伪湍动 |
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| 引用本文： | 许兆峰,罗锐,杨献勇,吴玉林.球形气泡在匀速粘性液体中引起的伪湍动[J].清华大学学报(自然科学版),2005,45(11):1540-1543. |
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| 作者姓名： | 许兆峰 罗锐 杨献勇 吴玉林 |
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| 作者单位： | 清华大学,热能工程系,北京,100084 |
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| 基金项目： | 国家自然科学基金资助项目(19572042) |
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| 摘 要： | 为改进在势流假设下获得的伪湍动表达式,该文在考虑液体粘性的基础上,简化匀速粘性液体绕球体的速度场,运用单元系综平均方法对流场进行处理,得到球形气泡在匀速粘性液体中引起的伪湍动关系式。该关系式表明伪湍动与空泡率成正比,并随颗粒R eyno lds数的增大而趋近势流结果。数据对比结果表明:在低空泡率、中等颗粒R eyno lds数的条件下,该表达式能比势流模型更准确地描述球型气泡在匀速粘性液体中引起的伪湍动。
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| 关 键 词： | 泡状流 Reynolds应力 伪湍动 单元系综平均 |
| 文章编号： | 1000-0054(2005)11-1540-04 |
| 修稿时间： | 2004年11月8日 |
Pseudo turbulence induced by spherical bubbles moving in a uniform viscous liquid |
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| XU Zhaofeng,LUO Rui,YANG Xianyong,WU Yulin.Pseudo turbulence induced by spherical bubbles moving in a uniform viscous liquid[J].Journal of Tsinghua University(Science and Technology),2005,45(11):1540-1543. |
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| Authors: | XU Zhaofeng LUO Rui YANG Xianyong WU Yulin |
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| Abstract: | A formula of the pseudo turbulence which considers the liquid viscosity was developed to overcome the limitations of the potential formula by simplifying and averaging the velocity field for a uniform viscous liquid passing a spherical bubble using the cell-ensemble average method.The result shows that the pseudo turbulence level is directly proportional to the void fraction and approaches the potential formula result with increasing particle Reynolds numbers.The result agrees well with experimental data and is more accurate than the potential formula for describing the pseudo turbulence induced by spherical bubbles moving in a uniform viscous liquid for low void fractions and medirate particle Reynolds numbers. |
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| Keywords: | bubbly flow Reynolds stress pseudo turbulence cell-ensemble average |
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