機械通風式冷却塔からの白煙予測手法の開発 : 第1報,白煙予測のための風洞実験(流体工学,流体機械)  [in Japanese] Development of Prediction Method for a Visible Plume from a Mechanical Draft-Cooling Tower : 1st Report, Wind Tunnel Experiments to Predict a Visible Plume(Fluids Engineering)  [in Japanese]

We developed a method for a wind tunnel experiment to predict a visible plume region from a mechanical-draft cooling tower. The diffusions of water vapor and temperature emitted from the cooling tower in the wind tunnel experiment are tracked using tracer gas. It is assumed that the plume-induced fog is generated whenever the instantaneous specific humidity predicted from the concentration of the tracer gas at measuring points is larger than the inferred saturation specific humidity. To estimate the accuracy of the present method, the measurements are compared with the observations. The results show that the visible plume length and height are in good agreement with the observations. Furthermore, it is found that the visible length and height is strongly affected by wind direction to the cooling tower, temperature difference between atmosphere and exit of the cooling tower and atmospheric humidity, and hence the present wind tunnel method considered these conditions is valid to predict the visible plume.