Pressure oscillation and a new method to calculate the heat transfer coefficient for steam jet condensation
Pressure oscillation and a new method to calculate the heat transfer coefficient for steam jet condensation
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压力振荡与蒸汽射流冷凝传热系数计算新方法
DOI：
10.1016/j.ijheatmasstransfer.2016.09.045
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发表时间：
2017
影响因子：
5.2
通讯作者：
Xinzhuang Wu
中科院分区：
文献类型：
--
作者：
Binbin Qiu;Junjie Yan;Shripad T. Revankar;Xinzhuang Wu
压力振荡和传热是直接接触冷凝的两个重要方面。本文在蒸汽质量流量为441-865 kg/（m2 s），水温为293-343 K的范围内对这两种情况进行了研究。压力振荡频率随蒸汽质量流量和水温的增加而减小。随着喷管压比的减小，频率先增大后减小。换热系数随压力振荡频率的变化规律基本一致。得到了压力振荡频率和传热系数两个无量纲量，无量纲传热系数与压力振荡频率成正比。本文提出了一种计算蒸汽喷射冷凝传热系数的新方法。预测值与实验数据之间的误差在-30%至25%之间。
The pressure oscillation and heat transfer are two important aspects for direct contact condensation. Both of them have been investigated within the steam mass flux 441–865 kg/(m2s) and water temperature 293–343 K in this paper. The frequency of pressure oscillation decreases with the increasing steam mass flux and water temperature. While, the frequency first increases then subsequently decreases with the decreasing pressure ratio of the nozzle. The heat transfer coefficient has the same variation regularities with the frequency of pressure oscillation. Two dimensionless quantity of frequency of pressure oscillation and heat transfer coefficient have been obtained, the dimensionless heat transfer coefficient is proportional to the dimensionless frequency of pressure oscillation. A new simpler method to calculate the heat transfer coefficient for steam jet condensation has been given. The errors between the predicted values and experimental data are within −30% to 25%.
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