Experiment study on steam-water direct contact condensation in water flow in a Tee junction

Experiment study on steam-water direct contact condensation in water flow in a Tee junction
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三通管内水流汽水直接接触凝结试验研究

DOI:
10.1016/j.applthermaleng.2017.03.127
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发表时间:
2017-06
影响因子:
6.4
通讯作者:
Lu T.
Lu T.
中科院分区:
工程技术2区
文献类型:
--
作者:
Li S. Q.;Wang L.;Chen H. S.;Lu T.

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直接接触冷凝现象是许多工程领域中遇到的一个重要过程。本文对饱和蒸汽直接排入三通过冷水流中的直接接触凝结进行了实验研究。在可视化实验台上,采用高速摄像机记录了汽-水界面的变化。实验结果表明,在不同的工况下,可以观察到6种典型的冷凝模型,并建立了基于蒸汽质量流量、水体积流量和温度的工况图。此外,对于较大的喘振,吸入分支管的最大水位高度随着水温、蒸汽体积流量和蒸汽质量流量的增加而减小。对于射流,无因次蒸汽羽流长度和平均传热系数分别为0.8-3.2和0.3- 1.7MW/(m2 K)。在此基础上,建立了无量纲蒸汽羽流和平均传热系数的经验关联式。
The phenomenon of direct contact condensation is an important process encountered in many engineering fields. In this paper, experiments are performed to investigate the direct contact condensation of saturated steam discharged directly into sub-cooled water flow in a Tee junction. A high-speed camera was employed to record the steam-water interface variation in the visualized experiment rig. The experimental results show that, six typical different condensation models are observed and a regime diagram is established based on steam mass flux, water volume flow rate and temperature. Additionally, for large chugging, the maximum elevation of level of water sucked up into the branch pipe decreases with the increase of water temperature and volume flow rate as well as steam mass flow rate. For jet flow, the dimensionless steam plume length and average heat transfer coefficient are found to be in the range of 0.8–3.2 and 0.3–1.7 MW/(m2K), respectively. Furthermore, empirical correlations for the dimensionless steam plume and average heat transfer coefficient are developed.
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