Experimental study on the stable steam jet in subcooled water flow in a rectangular mix chamber
Experimental study on the stable steam jet in subcooled water flow in a rectangular mix chamber
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DOI：
10.1016/j.expthermflusci.2015.10.021
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发表时间：
2016-07
影响因子：
3.2
通讯作者：
Xiao Zong;Jiping Liu;Xiaoping Yang;Yi Chen;Junjie Yan
中科院分区：
文献类型：
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作者：
Xiao Zong;Jiping Liu;Xiaoping Yang;Yi Chen;Junjie Yan
两相流蒸汽喷射器 (TFSI) 是一种没有移动部件的简单设备，已在多种工业应用中使用。作为TFSI的一个重要过程，静水池中的汽水直接接触冷凝(DCC)已被广泛研究。 DCC在水流受限通道中发生时具有不同的特征，这与TFSI中的DCC过程更相似。在目前的工作中，对矩形混合室中过冷水流中稳定蒸汽射流的直接接触冷凝进行了实验研究。采用矩形蒸汽和水喷嘴形成准平面结构流飞行，观察到圆锥形射流和椭圆形射流两种不同的稳定蒸汽射流。观察了从稳定蒸汽射流到发散射流的转变，并建立了转变准则。基于蒸汽质量通量、水质量通量和进水温度，提出并讨论了三维状态图。此外，还测量了稳定蒸汽射流的底壁中心的温度和压力分布。温度分布的峰值证明了压缩波，而压力分布的最低点证明了膨胀波。此外，由于湍流强度，界面传输模型预测的平均传热系数在3.83-6.24MW/m2K范围内，与之前的研究处于同一数量级，预测值与实验值之间的差异在±30%以内。
Two-phase Flow Steam Injector (TFSI) was a simple device without moving parts, which had been used in several industrial applications. As an important process of the TFSI, steam-water Direct Contact Condensation (DCC) in stagnant water pool had been widely investigated. DCC had different features when occurring in a confined channel in water flow, which is more similar to the DCC process of that in TFSI. In present work, direct contact condensation of stable steam jet in subcooled water flow in a rectangular mix chamber was investigated experimentally. Rectangular steam and water nozzles were adopted to form a quasi-planar structural flow flied and two different stable steam jets including conical jet and ellipsoidal jet were observed. The transition from stable steam jet to divergent jet was observed and the transition criterion was also established. A three-dimensional regime diagram was presented and discussed based on steam mass flux, water mass flux and inlet water temperature. In addition, temperature and pressure distributions on the bottom wall center for stable steam jet were measured. The peaks in temperature distributions evidenced the compression wave, whilst the nadirs in pressure distributions were evidence to the expansion wave. Furthermore, average heat transfer coefficients predicted by interfacial transport model due to turbulent intensity were in the range of 3.83–6.24 MW/m2K, which were in the same order of magnitude with previous investigations, and the discrepancies between predicted and experimental values were within ±30%.