| Experimental Study of High Moisture Content Gas Flow Across a Cylinder at Moderate Reynolds Numbers |
| |
| 作者姓名： | 郭亮 |
| |
| 作者单位： | DepartmentofThermalEngineering,TsinghuaUniversity,Beijing100084,China |
| |
| 基金项目： | Supported by the Beijing Science and Technology Com -m ittee(No. 984 0 6 2 6 0 0) |
| |
| 摘 要： | The Nusselt number for cross flow of a mixture of air and vapor over a cylinder was measured at moderate Reynolds numbers (3000-7000) for temperatures from 300℃ to 700℃ and for vapor mass fractions of 0. 18 - 0. 35. Results are also presented for a set of three cylinders aligned perpendicular to the flow for the same range of conditions, The effect of the vapor concentration and temperature on the convection coefficients was investigated to develop a modified Zhukauskas correlation. The results show that the Nusselt number increases as the moisture content increases and that the increase is more than could be accounted for by typical models for the property variations of mixtures. The exponent of the vapor concentration term in the modified correlation is 0. 145 for the entire data set indicating the importance of the property variation due to the moisture content.
|
| 关 键 词： | 气液二相流 高水分含量气体 管流流动 雷诺数 对流系数 |
Experimental Study of High Moisture Content Gas Flow Across a Cylinder at Moderate Reynolds Numbers |
| |
| D.M.Christopher.Experimental Study of High Moisture Content Gas Flow Across a Cylinder at Moderate Reynolds Numbers[J].Tsinghua Science and Technology,2003,8(5):598-604. |
| |
| Authors: | DMChristopher |
| |
| Abstract: | The Nusselt number for cross flow of a mixture of air and vapor over a cylinder was measured at moderate Reynolds numbers (3000-7000) for temperatures from 300℃ to 700℃ and for vapor mass fractions of 0.18-0.35. Results are also presented for a set of three cylinders aligned perpendicular to the flow for the same range of conditions. The effect of the vapor concentration and temperature on the convection coefficients was investigated to develop a modified Zhukauskas correlation. The results show that the Nusselt number increases as the moisture content increases and that the increase is more than could be accounted for by typical models for the property variations of mixtures. The exponent of the vapor concentration term in the modified correlation is 0.145 for the entire data set indicating the importance of the property variation due to the moisture content. |
| |
| Keywords: | high moisture content cross flow convection coefficients heat exchangers |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
