水流热扩散系数的试验研究

Experimental Study on Thermal Diffusion Coefficients in Water Flow

摘要: 在系统的明槽水流试验基础上,本文探讨了水流热扩散系数的基本规律.试验成果分析表明:纵向分散系数的适宜尺度是流速分布不均匀综合因素,并与比降和弗汝德数有关,同时给出了估算水流热纵向分散系数的公式;横向热扩散系数与化学物质扩散系数有相似的规律。笔者运用误差理论,导出了温度测量值的不确定度和纵向分散系数的不确定度估算公式。
- 热扩散系数 /
- 纵向分散 /
- 横向扩散 /
- 热污染
Abstract: Based on systematic open Ilume flow experiments, this paper investigates the basic lows of thermal diffusion coefficients in water flow. The analysis of testing results show that the proper scale of longitudinal dispersion coefficients, related to the water surface slope and Froude number, is the nonhomogeneous compre-hensive factor of velocity distribution. A formula for calculating tt}e thermal longitudinai dispersion coefficient in water flow is proposed. Meanwhile, the authors found that the coefficient of thermal transverse diffusion has the similarities to that of chemical matter-diffusion. Finally, the formulae for estimating the uncertainties of temperature measurements and longitudinal dispersion coefficients are derived by using error theory.
- thermal diffusion coefficient /
- longitudinal dispersion /
- transverse diffusion /
- thermal pollution

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