CAJ | 학술논문

对溴化锂溶液在水平管间的实际液滴流动过程进行了记录分析,以改进目前滴状降膜吸收数值模型中的理想化球形液滴假设.使用高速摄像机,对16 mm管间距下溴化锂溶液滴状流动过程进行了拍摄.采用图像边缘识别技术、样条拟合和二维曲线旋转积分方法,得到了液滴表面积和体积关于时间的变化关系.根据液滴的发展特点,将管间液滴形成划分为悬垂拉伸、不稳定液柱和破裂降落3个阶段,据此提出了不同溶液流量下液滴形成的预测模型.管间液滴表面积和体积发展的预测曲线与实测结果吻合较好.该模型可以在滴状降膜传热传质数值计算中得到应用.
대추화리용액재수평관간적실제액적류동과정진행료기록분석,이개진목전적상강막흡수수치모형중적이상화구형액적가설.사용고속섭상궤,대16 mm관간거하추화리용액적상류동과정진행료박섭.채용도상변연식별기술、양조의합화이유곡선선전적분방법,득도료액적표면적화체적관우시간적변화관계.근거액적적발전특점,장관간액적형성화분위현수랍신、불은정액주화파렬강락3개계단,거차제출료불동용액류량하액적형성적예측모형.관간액적표면적화체적발전적예측곡선여실측결과문합교호.해모형가이재적상강막전열전질수치계산중득도응용.
To improve the ideal sphere model in the numerical simulation of falling film absorption in droplet mode,the real droplet flow process of LiBr solution between horizontal tubes has been recorded and analyzed. A high speed camera was used to take pictures of the LiBr solution droplet flow behavior between horizontal tubes separated by 16 mm. The variations of droplet surface area and volume with time were obtained using image edge detection technique,spline curve fitting algo-rithm and 2-dimensional curve revolving integral method. According to the analysis of the droplet evolution characterstics, the droplet formation between the tubes was divided into three phases,including elongation ,unsteady column and break and fall,based on which the prediction model of the droplet evolution at different solution amounts was proposed. The prediction curve of the droplet evolution in surface area and volume agreed well with the experimental data,indicating that the model can be applied to mathematical calculation of heat and mass transfer of droplet falling film.