化工学报 ›› 2019, Vol. 70 ›› Issue (S1): 54-60.DOI: 10.11949/j.issn.0438-1157.20180991

• 流体力学与传递现象 • 上一篇    下一篇

纯水静态闪蒸中液膜高度演变的实验研究

王辉辉(),张丹(),杨庆忠,牛照程   

  1. 西安交通大学动力工程多相流国家重点实验室,陕西 西安 710049
  • 收稿日期:2018-09-06 修回日期:2019-01-11 出版日期:2019-03-31 发布日期:2019-03-31
  • 通讯作者: 张丹
  • 作者简介:<named-content content-type="corresp-name">王辉辉</named-content>(1994—),男,硕士研究生,<email>wang_hh@stu.xjtu.edu.cn</email>|张丹(1983—),男,博士,教授,<email>zhangdan@mail.xjtu.edu.cn</email>
  • 基金资助:
    国家重点研发计划项目(2018YFB0604303)

Experimental study on evolution of waterfilm height during static flash of pure water

Huihui WANG(),Dan ZHANG(),Qingzhong YANG,Zhaocheng NIU   

  1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049,Shaanxi, China
  • Received:2018-09-06 Revised:2019-01-11 Online:2019-03-31 Published:2019-03-31
  • Contact: Dan ZHANG

摘要:

设计搭建了静态闪蒸实验台,利用高速摄影对不同过热度、节流孔板直径和闪蒸速率下纯水静态闪蒸过程中液膜高度的演变规律进行了实验研究。实验中过热度为7.0~32.5 K,节流孔板直径为5、10、20 mm,闪蒸速率为0.004~0.073 s-1。通过液膜膨胀率来衡量和比较液膜高度的变化,液膜膨胀率是指闪蒸过程中液膜实时液位与初始液位的比值。结果表明:最大膨胀率随过热度或节流孔板直径的增大而增大;节流孔板直径一定时,闪蒸速率可通过改变过热度来调节,此时最大膨胀率随闪蒸速率的增大而减小;当过热度一定时,闪蒸速率可通过改变节流孔板直径来调节,此时最大膨胀率随闪蒸速率的增大而增大。最后,根据实验结果拟合得到过热度、闪蒸速率与最大膨胀率的实验关联式,其计算值与实验值吻合良好。本文研究结果对工业闪蒸设备小型化、紧凑化和精细控制提供了重要的实验依据。

关键词: 静态闪蒸, 过热度, 节流孔板直径, 闪蒸速率, 最大膨胀率

Abstract:

Experimental study on evolution of waterfilm height during static flash of pure water was carried out with superheat varying between 7.0 K and 32.5 K, orifice diameter at 5, 10, 20 mm, and flash speed between 0.004 s-1 and 0.073 s-1. Results indicated that the maximum expansion rate of waterfilm increased with rising superheat or orifice diameter. At given orifice diameter, the flash speed decreased with rising superheat, however, the maximum expansion rate of waterfilm increased with it. At given superheat, both flash speed and the maximum expansion rate increased with increasing orifice diameter. At last, an experimental correlation was set up between maximum expansion rate and superheat, flash speed. The calculated results matched well with experimental data. These results provided a technical support for the miniaturization, compactness and finely control of industrial flash system.

Key words: static flash, superheat, orifice diameter, flash speed, maximum expansion rate

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